Air Valve Brochure

V

PROVIDINGSYSTEM

EFFICIENCYAND

PROTECTION

AIR VALVESBulletin 1500

2

TABLE OF CONTENTSUNDERSTANDING AIR VALVES

Air and It’s Impact on a Water and Wastewater System pp. 3-7Exclusive Features and Benefits p. 8Wastewater Features and Benefits p. 9

AIR VALVE APPLICATIONS

Basic Applications and Solutions p. 10Applications, Functions, Purpose, and Features Chart p. 11

TECHNICAL DATA

Water and Wastewater Air Release Valves pp. 12-13

Water and Wastewater Air/Vacuum Valves pp. 14-15

Water & Wastewater Combination Air Valves pp. 16-19

Anti-Slam Combination Air Valves pp. 20-21

Well Service Air Valves pp. 22-23

Vacuum Breaker Valves pp. 24-25

Vacuum Priming Valves pp. 26-27

VCopyright 2004 Val-Matic Valve & Mfg. Corp.

O ne of the most misunderstood aspects of theWater & Wastewater industry is the presence ofair in a pipeline and its impact on operations.

Many operational problems, especially at the time of initialstart-up including broken pumps, valves and pipe, as wellas faulty instrumentation readings, are blamed oninadequate thrust blocking, improper pipeline bedding, etc.In reality, many of these problems are not caused byimproper installation of the line, but by failure to de-aeratethe line. Properly de-aerating your pipeline will safeguard itfrom air-related problems, however if no steps are taken toaccomplish this, you should be ready for trouble.

SOURCES OF AIR

Air in a pressurized, operating pipeline comes from threeprimary sources. First, prior to start-up, the line is notempty - it is full of air. To entirely fill a pipeline with fluid, itis necessary to eliminate this air. As the line fills, much ofthis air will be pushed downstream to be released throughhydrants, faucets, etc. But a large amount will becometrapped at system high points (Figure One). Thisphenomenon will occur because air is lighter than waterand therefore, will collect at the high points. This air willcontinuously be added to by the second and third sourcesas the system continues operation.

Source number two is the water itself. Water containsapproximately 2% air by volume. During system operation,the entrained air will continuously separate out of the waterand once again accumulate at system high points. Toillustrate the potential massive amount of air this 2%represents, consider the following: A 1000 ft. length ofpipe could contain a pocket of air 20 ft. long if all the airaccumulated in one location. Or a one mile length of pipecould contain a 100 ft. slug. This would be true regardlessof the diameter of the pipe.

The third source of air is that which enters throughmechanical equipment (Figure Two). This includes airbeing forced into the system by pumps as well as air beingdrawn in through packing, valves, etc. under vacuumconditions. As one can see, a pressurized pipeline is neverwithout air and typically the volume is substantial.

IMPACT OF AIR ON SYSTEM

Now that we have identified the air sources, let us considertheir impact on the system. Two problems are apparent. Thepocket(s) of air accumulating at a high point(s) can result ina line restriction (Figure Three). Like any restriction, the

Air collects at high points

Air collects at high points

Air bubbles raise to high point,increasing in size

Air bubbles raise to high point,increasing in size

Restricted flow increasesvelocity and head loss

FIGURE ONE

FIGURE THREE

FIGURE TWO

AIRAIR&

3

4

pocket(s) of air increases headloss, extends pumping cyclesand increases energy consumption. The presence of air canalso promote corrosion of pipe and fittings. As air continuesto accumulate at system high points, the fluid velocityincreases as the fluid is forced through a smaller andsmaller opening.

As the pocket(s) grow, one of two phenomena will occur. Thefirst possibility is a total flow stoppage (Figure Four). If systemdynamics are such that the air cannot be continuouslytrimmed (removed) by the increased fluid velocity andpushed downstream, then this could happen. As thepocket(s) continues to accumulate air, a pressure drophigher than pump capacity can develop and stop all flow.

The second, and more likely occurrence, is that theincreased velocity will cause all, or part of, the pocket tosuddenly dislodge and be pushed downstream (Figure Five).The sudden and rapid change in fluid velocity when thepocket dislodges and is then stopped by another high point,

can and often will, lead to a high pressure surge (waterhammer). Serious damage to valves, fittings, gaskets, oreven breakage of the line can occur. This is the mostserious of the possible consequences of air being allowed toaccumulate in system high points.

HISTORICAL SOLUTIONS

As we can see, air in a pressurized pipeline is a seriousconcern. Obviously, it's removal will result in a moreefficient, cost effective operation and potentially avoid moreserious problems. In the early 1900's, engineers and waterworks personnel started developing an understanding of the

problems associated with air and the search for a solutionwas on. Some depended on standpipes, believing that a largeportion of the air would be expelled through them. Manybegan placing gate or ball valves at system high points tomanually bleed off accumulated air. Unfortunately, it hasproved impossible to predict when it is time to bleed the air.This proved impractical, especially on larger systems. Openfire hydrants (Figure Six) are frequently used under theassumption that all air in the pipeline will be released.Unfortunately, hydrants are generally connected to the side of

Part of air pocket breaksaway, creating surge

FIGURE FIVE

“Air in a pressurized pipeline is a serious concern. Obviously, it's removal will result in a more efficient, cost effective operation and potentially avoid more serious problems.”

FIGURE FOUR

Air Pocket

DistributionLine

Butterfly Valve

FIGURE SIX

Hydrant

5

the pipe, leaving air trapped at the top and at system highpoints. It should be noted that there are still a fewmunicipalities using these methods!

THE AIR VALVE SOLUTION

Today, most municipalities utilize Automatic Air Valves.They are available in many different designs andconfigurations for a wide range of applications. Theirfunction is to automatically release and admit air withoutoperator assistance. Today, countless Air Valves areperforming this task around the globe on a daily basis.

Air Valves are available in three basic configurations;(Figure Seven) Air/Vacuum Valves, Air Release Valves andCombination Valves. Correct sizing and location of all threetypes are critical (Figure Eight). Every high point greaterthan one pipe diameter where the pipeline converts from apositive grade to a negative grade requires an air valve.Even minimal high points with small air pockets can causeserious surge problems. In addition, it is recommendedthat air valves be installed every half mile or 2500 feet onstraight horizontal runs.

AIR/VACUUM VALVES

FIGURE SEVEN

FIGURE EIGHT

FIGURE NINE

OPENAir exhausted during

pipeline fill

OPENAir enters duringpipeline draining

CLOSEDPipeline under

pressure

Air Release Valve

Air/VacuumValve

CombinationAir Valve

6

Air/Vacuum Valves (Figure Nine), sometimes referred to as"large orifice" valves, are used to exhaust large quantities ofair upon system start-up, as well as allowing air to re-enterthe line upon system shut down or system failure. As waterenters the valve, the float will rise, closing the dischargeport. The valve will remain closed until system pressuredrops to near zero psi. It will not open and release anyaccumulation of air while the system is under pressure.

An added benefit of an Air/Vacuum Valve is its ability toprovide pipeline vacuum protection. If a negative pressuredevelops, the valve will open, admitting air into the line,preventing a possible pipeline collapse or intensified surges.While Air/Vacuum Valves will exhaust large quantities of airupon start-up, it should be remembered that they will notcontinuously release air during system operation. For thisfunction, an Air Release Valve is required.

WELL SERVICE AIR VALVES

Well Service Air Valves (Figure Ten) are a member of theAir/Vacuum Valve family. Vertical Turbine pump manufac-turers recommend the use of Well Service Air Valves toeliminate the introduction of air into the line by the pump.They are specifically designed to vent air from the pumpcolumn upon pump start-up, prior to the check valve opening.

Well Service Air Valves are equipped with Throttling Devicesand piped exhausts to control the rapid air discharge fromthese valves. Val-Matic provides Dual Port ThrottlingDevices (Figure Eleven) on 1/2” to 3” valves and Anti-Slamon 4” and larger. The Throttling Device provides controlledair discharge and full vacuum flow after pump shutdownthrough a separate top port. With the Val-Matic Dual Port

Throttling Device, the vacuum flow does not need to flowthrough the drain piping thereby eliminating the risk ofcontamination of vacuum blockage.

AIR RELEASE VALVES

Unlike an Air/Vacuum Valve, an Air Release Valve (FigureTwelve), sometimes referred to as a "small orifice" valve, willcontinuously release accumulated air during systemoperation. As air from the pipeline enters the valve, itdisplaces the water, allowing the float to drop. The air isthen released into the atmosphere through a small orifice.As the air is vented it is replaced by water, raising the floatand closing the valve orifice. As air accumulates, the valvewill continue to cycle in this manner to remove collected air.

COMBINATION AIR VALVES

Combination Air Valves (Figure Thirteen) are the most com-monly used valves. They perform the functions of anAir/Vacuum Valve (exhaust large quantities of air on start-up,

FIGURE TWELVEFIGURE TEN

“An added benefit of an Air/Vacuum Valve is its ability to provide pipeline vacuum protection. If anegative pressure develops, the valve will prevent a possible pipeline collapse.”

FIGURE ELEVEN

Inlet

Controlled AirDischarge

Full Vacuum Flow

7

admit air on shut-down) and Air Release Valves (release aircontinuously during operation). Combination Air Valves areavailable in single body and dual body (an Air/Vacuum Valveand Air Release Valve piped together) configurations. Thesingle body configuration is more compact and economical.The dual body configuration provides two independentvalves so that if maintenance is being performed on theair release valve, the air/vacuum valve is still protectingthe pipeline. The dual-body valve also provides a muchwider range of sizing options.

ANTI-SLAM COMBINATION AIR VALVES

Anti-Slam Combination Air Valves (Figure 14) are commonlyused on pipeline highpoints where rapid changes in flowvelocity or column separation may occur. Column separationis a serious phenomenon in a pipeline caused by theformation of a vapor pocket at high points above thehydraulic grade line after pump outages. The vapor pocketrapidly collapses as the water columns rejoin causingextreme surge pressures in the piping system. Anti-Slam

Valves provide pipelines with all the protection of a standardcombination air valve plus the additional feature of ananti-slam, regulated closure device which prevents the airvalve from being slammed shut during critical operation. Theflow of water is throttled through the anti-slam device to adegree that allows the air valve to fill at a controlled rate. Bycontrolling the air valve closure, a shock or water hammercondition is prevented from occurring within the valve.

VACUUM BREAKER VALVES

For critical applications where vacuum protection is a mustor where column separation is predicted, a vacuum breaker(Figure 15) is used. The Vacuum Breaker is mounted atcritical pipeline high points, penstocks, or tanks and allowsfor rapid inflow of atmospheric air through a screened hoodto reduce vacuum conditions in piping systems.

When positive pressure in the system is restored, the vacuumbreaker provides a positive synthetic seal to maintain systempressure. When equipped with an air release valve, thevacuum breaker can be used to slowly exhaust the air thatwas admitted to the pipeline. The slow release of air preventsthe sudden rejoining of separated columns in a pipeline andthe associated pressure surges or water hammer.

SUMMARY

To summarize, when air is allowed to accumulate inpressurized pipelines, efficiency is sacrificed and seriousdamage can occur. A properly de-aerated pipeline will notsolve all surge problems; however, the elimination of air cansolve one of the most common causes. Air Valves are a costeffective, reliable method of improving efficiency andsolving air related surge problems.

FIGURE THIRTEEN

FIGURE FIFTEEN

FIGURE FOURTEEN

8

The Val-Matic Air Valve sizing program is aneasy to use Windows Computer Program forlocating and sizing Air Valves in Water andWastewater applications.

Provided system parameters, airValve® willcalculate system data and develop criteria suchas flow rate due to slope. It will recommend valvelocations, sizes and models and print a valveschedule with profile for the user. Finally, theprogram will save your data for future reference.

Available online for download, or by requestinga copy, the Val-Matic airValve® Sizing Softwareis an indispensible, free resource that allowsengineers to more effectively, and more easily,design their pipeline.

F rom the float material to the shapeof the body, Val-Matic Air Valvesare designed for years of reliable

performance. All valves meet AWWAC512 requirements.

HEAVY DUTYSTAINLESS STEEL

Stainless steel type 316 is the standard ofWater & Wastewater facilities throughoutthe world when quality and longevitycount. That is the reason Val-Maticuses type 316 stainless steel in everyinternal component in every Air Valvewe make. From nuts to floats, it's allyou'll find inside Val-Matic AirValves. The only exception is theresilient sealing member. Oursealing members use a variety ofsynthetic compounds to assure a tight sealfrom the lowest system pressures to thevalve's maximum rated working pressure.

The float is the heart of an Air Valve. Onepinhole or nick in the float's sealing surfacewill cause premature failure. That's whyVal-Matic starts with heavy-duty type 316stainless steel and uses it exclusivelythroughout our line. Val-Matic unconditionallyguarantees all air valve floats.

Providing a quality float is not enough toassure a good seal every time. When

entering the seat, a damaged or off-centerfloat will prevent a valve from closing. Thehigh velocities that Air/Vacuum valves areexposed to can cause unguided floats to beviolently tossed about from side to side andcontinuously thrust against the valve body.For these reasons, all Val-Matic Air/ VacuumValve floats are center guided.

Center guiding guarantees that thefloat approaches the seat at a90° angle to provide a positivedrop tight seal each time.Round stainless steel bushings

position the hexagonal guides andhold them firm. The use of hexagonalguides in round bushings preventsbinding and allows for self-cleaning

of the bushings.

SEATS

All standard models incorporate a resilientsealing member which mates to stainlesssteel. Air Release Valves have a syntheticsealing member mounted to the floatlinkage mechanism. It closes against astainless steel seat mounted in the valvecover. On Air/Vacuum Valves, the stainlesssteel float closes against a synthetic seatmechanically retained in the body. Thepatented resilient seat provides positive shutoff from the lowest system pressure to thevalves rated working pressure.

AIR/VACUUM INLETSAND OUTLETS

When is a two-inch hole smaller than atwo-inch hole? When you buy an Air/Vacuumvalve with inlets and outlets of differentdiameters. A two-inch Air/Vacuum Valve witha one-inch outlet orifice has the effective

capacity of only a one-inchAir/Vacuum Valve. Put simply,no one can put more than agallon of water in a galloncontainer. No one can push

more air through a one-inchhole than its size is capable of

allowing.

That's why check valve and shut-off valvemanufacturers strive to maintain full pipediameter through the valve body. A loss ofefficiency occurs when you restrict flowthrough the valve. In the case of anAir/Vacuum valve, it can lead to seriousconsequences if the valve is not capable ofrelieving a vacuum condition due to restrictedflow. For this reason, all Val-MaticAir/Vacuum valve outlets are greater orequal to the valve's nominal size.

Val-Matic has expertise and experience inproviding global solutions to air relatedconcerns coupled with quality products.That is why Val-Matic is the world leader inair valve technology!

Exclusive Features and BenefitsSi

zing

Sof

twar

e

9

W astewater Air Valves are designed for non-clogoperation. The body is extended to keep themedia away from the operating mechanism.

The body is also expanded and sloped at the bottom to helpprevent clogging. Val-Matic provides a minimum 2" inlet and2” cleanout on all wastewater air valves to facilitate thepassage of solids.

While all of these design initiatives help, they do notcompletely eliminate the problem of wastewater build upinside the valve, especially in collection systems containing ahigh grease content from food and drink establishments. Itshould be noted that all wastewater air valves experiencewastewater and grease buildup problems. Therefore, it isrecommended that the specifier consider one or more of thefollowing options when purchasing wastewater air valves.

COATINGS

Two optional coatings are available to minimize the build up ofsewage on the inside of the valve. The first is fusion bondedepoxy. Used extensively in the municipal Water & Wastewaterindustry it is extremely durable and holds up well to theabrasive nature of wastewater. The coating minimizes thebuildup of grease and sewage on the interior walls of the valve.

The second coating available is a special Teflon coatingdeveloped by Val-Matic that performs extremely well inwastewater and does an excellent job of minimizing buildup.This option should be considered when high concentrations ofgrease are present.

BACKWASHING ON SITE

In most wastewater systems, backwashing will be necessary.The frequency will be determined by whether or not the interiorof the valve has been coated, the turbidity of the flow, andgrease content. Backwash kits contain the fittings, shut offvalves and rubber hose necessary to complete the job. A 1"clean water supply of at least 30 psi is needed at the site.

BACKWASHING OFF SITE

For those installations where backwashing on site is notpractical or desirable, a final option is to establish a valverotation program. The program provides for scheduledbackwashing of all valves in the system. A backwashed valvereplaces one requiring service. The valve to be serviced istaken back to the shop, placed in a backwash rig and cleaned.It is then ready to replace the next valve scheduled. The valverotation program also provides the benefit of a backup valve inthe unlikely event one should ever fail.

Wastewater Features & Benefits

Air Release Valve with Backwash Accessories

Dual Body Combination Air Valve w/Backwash Acc.

10

T he wide range of air relatedconcerns in pipeline andtreatment plant design require a

multitude of solutions. With the broadestline of air valves available coupled withEngineering expertise and Manufacturingexperience, Val-Matic is the number onesource for solutions to air related issues.The following are a few of the basic valveapplications and the solutions Val-Maticcan provide.

EFFICIENCY ANDVACUUM PROTECTION

The primary purpose of air valves is to providepipeline efficiency by continuous removal ofair at pipeline highpoints and vacuumprotection by admitting large quantities of airupon pump shut down or system failure.

SURGE PROTECTION

Less recognized is the use of air inpipelines to control or reduce surges.Surges result from sudden changes in thevelocity of the pipeline fluid that occurregularly due to pump start up and shutdown. The effects of surges can bedevastating. Surges are typically equal toapproximately 50 psi for every 1 ft/sec ofrapid change in flow velocity. This is addedto the pipeline static pressure. Throughcomputer modeling and transient analysisit has been shown that air and air valvescan play a critical roll in preventing andcontrolling pipeline surges.

LINE SURGES

Power/system failures canoften result in a column ofwater separating at high points

in the line. As mentioned previously, toprevent a vacuum from forming anAir/Vacuum Valve admits large quantities ofair into a pipeline. However, allowing the twocolumns of fluid to come back togetheruncontrolled can cause a tremendoussurge. Air is used to prevent a vacuum; usingeither an anti-slam device or a regulatedexhaust device in conjunction with aCombination Air Valve air can be used toprevent a surge. Both devices will regulatethe exhausting of air while leaving enoughair to cushion the impact of the two columnsof fluid when they collide. Another solutionis to use a Vacuum Breaker with an AirRelease valve. While the vacuum breakerprovides unimpeded air flow for vacuumprotection, the small orifice of the AirRelease valve will slow the exhausting of airleaving behind a cushion to soften theimpact when the two columns collide.

PUMP COLUMN SURGES

Full velocity rapidly develops in a pumpcolumn when a vertical turbine pump startsagainst a closed check valve. A power actuatedcheck valve must absorb the full force of theimpending impact. A mechanical check valvewill open, relieving a portion of the force butwill take a beating. As discussed, the best wayto prevent extreme surges in the pump columnand connecting piping is to control thedischarge of air upon pump start up. Forsystems with mechanical check valves a WellService Air Valve with a Throttling, or Anti-Slam

device is used. The air is rapidlyvented at 2-5 psi from the pumpcolumn at a controlled rate so

that all or most of the air escapesjust before the force of the pump

pressure opens the

check valve. For systems with power actuatedcheck valves, a Well Service Air ReleaseValve is used. The valve orifice is sized tocontrol the rise of water in the pump columnat a reasonable velocity such as 2ft/sec. Thevalve vents air at the full pump pressure fora given period of time after which the controlvalve is signaled to open. The control valveopens after the Air Release valve vents air atthe full pump pressure for any given time.(See Val-Matic technical paper AEG-302.)

LOOK TO VAL-MATICFOR SOLUTIONS!

Engineering excellence....Manufacturingexperience….A broad line of valves. No wonder Engineers and system operatorslook to Val-Matic for solutions.

Basic Applications and Solutions

11

Applications, Functions, Purpose, and Features

Val-Matic AirValves fullycomply withANSI/AWWA

C512.

x

The following technical papers are available for additional information: Theory, Application, and Sizing of Air Valves; as well as Air Valves for Fire Protection.

12

WATER & WASTEWATERAIR RELEASE VALVES

Val-Matic Air Release Valves maintain your pipeline’sefficiency. Trapped pockets of air that accumulate in yourpipeline will lower your flow rates and increase surges. An AirRelease Valve that automatically releases these pockets ofair is an inexpensive and safe way to protect your line andimprove its value. As the flow decreases in a pipeline, thepumps are forced to work harder and are less efficient;ultimately this could result in a total system blockage. AirRelease Valves protect your line with minimal maintenanceor management. Unconditionally guaranteed stainless Steelfloats housed in rugged cast bodies assure that your line isprotected. The operation of an efficient line requires the useof an Air Release Valve.

MATERIALS OF CONSTRUCTION Standard Optional

Body and Cover Cast Iron, ASTM A126 Class B< 300 psig

Cast Steel, ASTM A216 Grade WCB Stainless Steel, ASTM A351 Grade CF8M

Ductile Iron, ASTM A536 Trim Type 316 Stainless Steel --Coating Universal Alkyd Primer Fusion Bonded Epoxy

Venting Capacity for Air Release Valve Orifice Sizes

OPTIONS:Vacuum CheckOutlet Hoods

13

WATER AIR RELEASE VALVESModel

NumberValveSize

InletSize

Outlet Size NPT

CWPPSI Orifice Size

DimensionsA B

15A 1/2” 1/2” 1/2” 175 1/16” 4 3/4” 5 1/4”15A.2 3/4” 3/4” 1/2” 175 1/16” 4 3/4” 5 1/4”15A.3 1” 1” 1/2” 175 1/16” 4 3/4” 5 1/4”22.3 1” 1” 1/2” 175 3/32” 5 1/8” 6”22.4 1/2” - 3/4” 3/4” 1/2” 175 3/32” 5 1/8” 6”22.7 1/2” 1/2” 1/2” 300 1/16” 5 1/8” 6”22.9 1/2” - 1” 1” 1/2” 300 1/16” 5 1/8” 6”25.5 1” 1” 1/2” 150 1/8” 6 1/8” 7”25.6 3/4” - 1” 1” 1/2” 300 3/32” 6 1/8” 7”38 1” 1” 1/2” 150 3/16” 7” 10”

38.2 2” 2” 1/2” 150 3/16” 7” 10”38.5 1” 1” 1/2” 300 5/32” 7” 10”38.6 2” 2” 1/2” 300 5/32” 7” 10”45 2” 2” 1” 150 23/64” 9 1/2” 12 1/4”

45.2 3” 3” 1” 150 23/64” 9 1/2” 12 1/4”45.5 2” 2” 1” 300 7/32” 9 1/2” 12 1/4”45.6 3” 3” 1” 300 7/32” 9 1/2” 12 1/4”50 2” 2” 1” 500 7/32” 10 7/8” 13”

50HP 2” 2” 1” 1000 1/8” 10 7/8” 13”

WASTEWATER AIR RELEASE VALVESModel

NumberValveSize

InletSize NPT

Outlet Size NPT

CWPPSI Orifice Size

DimensionsA B

48A 2” 2” 1/2” 150 3/16” 7” 15 5/16”48A.2 3” 3” 1/2” 150 3/16” 7” 15 5/16”48A.4 2” 2” 1/2” 75 5/16” 7” 15 5/16”48A.5 3” 3” 1/2” 75 5/16” 7” 15 5/16”49A 2” 2” 1” 150 7/16” 9 1/2” 17 9/16”

49A.2 3” 3” 1” 150 7/16” 9 1/2” 17 9/16”49A.4 2” 2” 1” 75 1/2” 9 1/2” 17 9/16”49A.5 3” 3” 1” 75 1/2” 9 1/2” 17 9/16”

WASTEWATER AIR RELEASE VALVES W/ BACKWASH ACCS.Model

NumberValveSize

InletSize NPT

Outlet Size NPT

CWPPSI Orifice Size

DimensionsA B

48ABW 2” 2” 1/2” 150 3/16” 10 1/2” 23 5/16”48A.2BW 3” 3” 1/2” 150 3/16” 10 1/2” 26 13/16”48A.4BW 2” 2” 1/2” 75 5/16” 10 1/2” 23 5/16”48A.5BW 3” 3” 1/2” 75 5/16” 10 1/2” 26 13/16”49ABW 2” 2” 1” 150 7/16” 14” 26 1/16”

49A.2BW 3” 3” 1” 150 7/16” 14” 29 9/16”49A.4BW 2” 2” 1” 75 1/2” 14” 26 1/16”49A.5BW 3” 3” 1” 75 1/2” 14” 29 9/16”

INSTALLATION DIMENSIONS/ORIFICE SIZES

15A - 50HPAir Release Valve

48A - 49A.5Wastewater Air Release Valve

48ABW - 49A.5BWWastewater Air Release Valve

w/BWA

Val-Matic’s dual feature Air/Vacuum valve protects yourpipeline from the damaging and expensive effects of air.When filling your line, large quantities of air are exhaustedthrough an Air/Vacuum Valve maximizing your fluid levels.Less air means more space available for fluid. AnAir/Vacuum valve responds to the loss of pressure duringintentional drains, power failures, and pipe bursts. The valveallows air to re-enter a system, which, equalizes the pressureand lessens the vacuum that causes pipeline collapses andintensifies surges.

OPTIONS:Vacuum Check Kits Threaded and Flanged OutletsThreaded Hoods Hooded OutletsAnti-Slam Device

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WATER & WASTEWATER AIR/VACUUM VALVES


Body and Cover Cast Iron, ASTM A126 Class BClass 125 and 250

Ductile Iron, ASTM A536 Grade 65-45-12Stainless Steel, ASTM A351 Grade CF8M

Trim Type 316 Stainless Steel -

Coating Universal Alkyd Primer Fusion Bonded Epoxy

FLOW CAPACITY OF AIR/VACUUM VALVES

15

WATER & WASTEWATER AIR/VACUUM VALVES

WATER AIR/VACUUM VALVES

ModelNumber

ValveSize

InletSize

Outlet Size

CWPPSI

DimensionsA B

100S 1/2” 1/2” NPT 1/2” NPT 300 6 1/8” 7”

101S 1” 1” NPT 1” NPT 300 7” 9 1/2”

102S 2” 2” NPT 2” NPT 300 9 1/2” 12”

103S 3” 3” NPT 3” NPT 300 9 1/2” 12”

WATER AIR/VACUUM VALVESModel

NumberValveSize

InletSize

Outlet Size

CWPPSI

DimensionsA B

104S154S 4” 4” Flg. 4” NPT

125lb - 150250lb - 300

12” 17”

106156

6” 6” Flg. 6” Hood125lb - 150250lb - 300

14” 20”

108158

8” 8” Flg. 8” Hood125lb - 150250lb - 300

18” 23”

110160

10” 10” Flg. 10” Hood 125lb - 150250lb - 300 20” 26”

112162

12” 12” Flg. 12” Hood 125lb - 150250lb - 300 24” 31”

114164 14” 14” Flg. 14” Hood 125lb - 150

250lb - 300 27” 34”

116166

16” 16” Flg. 16” Hood 125lb - 150250lb - 300 30 1/2” 34”

120170

20” 20” Flg. 20” Hood 125lb - 150250lb - 300 38 1/4” 36 1/4”

WASTEWATER AIR/VACUUM VALVESModel

NumberValveSize

InletSize

Outlet Size

CWPPSI

DimensionsA B

301A 1” 1” NPT 1” NPT 150 7” 15 1/16”

302A 2” 2” NPT 2” NPT 150 9 1/2” 17 7/16”

303A 3” 3” NPT 3” NPT 150 9 1/2” 17 7/16”

304 4” 4” Flg. 4” NPT 150 11 1/2” 36 1/2”

306 6” 6” Flg. 6”NPT 150 14” 36 1/2”

308 8” 8” Flg. 8” Flg. 150 18” 41 1/4”

WASTEWATER AIR/VACUUM VALVES W/ BACKWASH ACCESSORIESModel

NumberValveSize

InletSize

Outlet Size

CWPPSI

DimensionsA B

301ABW 2 x 1 2” NPT 1” NPT 150 10 1/2” 23 1/16”

302ABW 2 x 2 2” NPT 2” NPT 150 14” 24 7/16”

303ABW 3 x 3 3” NPT 3” NPT 150 14” 29 7/16”

304BW 4” 4” Flg. 4” NPT 150 17” 45 1/2”

306BW 6” 6” Flg. 6” NPT 150 20” 47”

308BW 8” 8” Flg. 8” Flg. 150 23” 53”

100S - 103SAir/VacuumValves

104S - 170Air/VacuumValves

301A - 308WastewaterAir/VacuumValve

301ABW - 308BWWastewater Air/Vacuum Valvew/BWA

Designed to bring together the features of an Air Releaseand Air/Vacuum Valve, Combination Air Valves give you themaximum of pipeline protection and efficiency. For highcapacity venting of air during pipeline filling theAir/Vacuum feature maximizes your fluids flow area. AnAir/Vacuum valve also forces air back into a system. Thispressurizes the pipeline and avoids a destructive vacuumthat occurs during draining or pipe bursts. Trapped pocketsof air that travel through a pipeline system are exhaustedthrough Air Release Valves. These pockets collect at highpoints and limit your fluids flow rate. That forces your pumpto work harder which increases your cost. CombinationValves combine the traditional and proven features of boththe Air Release and Air Vacuum valve.

OPTIONS:Outlet HoodsBackwash AccessoriesIsolation Valves

16

WATER & WASTEWATER COMBINATION AIR VALVES


Body and Cover Cast Iron, ASTM A126 Class BClass 125 and 250

Ductile Iron, ASTM A536 Grade 65-45-12Stainless Steel, ASTM A351 Grade CF8M



FLOW CAPACITY OF COMBINATION AIR VALVES

17


WATER COMBINATION AIR VALVES (SINGLE BODY)

ModelNumber

ValveSize

InletSize

Outlet Size

CWPPSI Orifice Size

Dimensions

A B

201C.2 1” 1” NPT 1” NPT 300 5/64” 11 3/8” 10 1/2”

202C.2 2” 2” NPT 2” NPT 300 3/32” 14” 13”

203C.2 3” 3” NPT 3” NPT 300 3/32” 16” 15”

204C.2 4” 4” NPT 4” NPT 300 3/32” 18 1/2” 17”

203C.14 3” 3” 125lb Flg. 3” NPT 150 3/32” 16” 17”

204C.14 4” 4” 125lb Flg. 4” NPT 150 3/32” 18 1/2” 19”

203C.15 3” 3” 250lb Flg. 3” NPT 300 3/32” 16” 17 1/2”

204C.15 4” 4” 250lb Flg. 4” NPT 300 3/32” 18 1/2” 19 1/2”

206C 6” 6” 125lb Flg. 6” Hood 150 3/8” 21” 20 1/4”

256C 6” 6” 250lb Flg. 6” Hood 300 7/32” 21” 20 1/4”

208C 8” 8” 125lb Flg. 8” Hood 150 3/8” 25” 23 1/2”

258C 8” 8” 250lb Flg. 8” Hood 300 7/32” 25” 23 1/2”

WATER COMBINATION AIR VALVES (DUAL BODY)

ModelNumber

ValveSize

InletSize

Outlet Size

CWPPSI Orifice Size

Dimensions

A B

101S/22.9 1” 1” NPT 1” NPT 300 1/16” 7 7/8” 15 5/8”

102S/22.9 2” 2” NPT 2” NPT 300 1/16” 10 1/4” 17 7/8”

103S/22.9 3” 3” NPT 3” NPT 300 1/16” 10 1/4” 18 1/4”

201C.2 - 204C.15Combination Air Valve

206C - 258CSingle Body

Combination Air Valve

101S/22.9 - 103S/22.9Dual Body Combination

Air Valve

Anti-Slam Combination Air Valves and Isolation Valves in a pump discharge application.

18


WATER COMBINATION VALVES (DUAL BODY)Model

NumberValveSize

InletSize

Outlet Size

Air/Vacuum

CWPPSI

Orifice SizeAir Release

Dimensions

A B104S/38

154S/38.54” 4” Flg. 4” NPT

125lb - 150250lb - 300

3/16”5/32” 21” 22”

106/38156/38.5

6” 6” Flg. 6” Hood125lb - 150250lb - 300

3/16”5/32” 24” 23”

108/38158/38.5

8” 8” Flg. 8” Hood125lb - 150250lb - 300

3/16”5/32” 27” 26”

108/45158/45.5

8” 8” Flg. 8” Hood125lb - 150250lb - 300

23/64”7/32” 30” 29”

110/38160/38.5

10” 10” Flg. 10” Hood125lb - 150250lb - 300

3/16”5/32” 30” 28”

110/45160/45.5

10” 10” Flg. 10” Hood125lb - 150250lb - 300

23/64”7/32” 33” 31”

112/38162/38.5

12” 12” Flg. 12” Hood 125lb - 150250lb - 300

3/16”5/32” 33” 32”

112/45162/45.5

12” 12” Flg. 12” Hood125lb - 150250lb - 300

23/64”7/32” 37” 34 1/2”

114/38164/38.5

14” 14” Flg. 14” Hood125lb - 150250lb - 300

3/16”5/32” 36” 34”

114/45164/45.5

14” 14” Flg. 14” Hood125lb - 150250lb - 300

23/64”7/32” 40” 36”

116/38166/38.5

16” 16” Flg. 16” Hood125lb - 150250lb - 300

3/16”5/32” 39” 34”

116/45166/45.5

16” 16” Flg. 16” Hood125lb - 150250lb - 300

23/64”7/32” 44” 37”

WASTEWATER COMBINATION AIR VALVES (SINGLE BODY)Model

NumberValveSize*

InletSize

Outlet Size

CWPPSI Orifice Size Dimensions

A B801A 2x1 2” NPT 1” NPT 150 1/8” 7” 14 15/16”802A 2x2 2” NPT 2” NPT 150 9/64” 9 1/2” 18 1/16”803A 3x3 3” NPT 3” NPT 150 11/64” 11” 23 1/2”804 4x4 4” NPT 4” NPT 150 11/64” 11” 23 1/2”

WASTEWATER COMBINATION AIR VALVES (DUAL BODY)Model

NumberValveSize*

InletSize

Outlet Size

CWPPSI Orifice Size

DimensionsA B

48A/301A 2x1 2” NPT 1” NPT 150 3/16” 20” 20 5/16”48A/302A 2x2 2” NPT 2” NPT 150 3/16” 20 3/4” 25 3/4”49A/302A 2x2 2” NPT 2” NPT 150 7/16” 20 3/4” 22 3/4”48A/303A 3x3 3” NPT 3” NPT 150 3/16” 21 1/2” 28 1/4”49A/303A 3x3 3” NPT 3” NPT 150 7/16” 21 1/2” 24 3/4”48A/304 4X4 4” Flg. 4” NPT 150 3/16” 20 3/4” 36 1/2”49A/304 4x4 4” Flg. 4” NPT 150 7/16” 20 3/4” 36 1/2”48A/306 6x6 6” Flg. 6” NPT 150 3/16” 23 1/4” 36 1/2”49A/306 6x6 6” Flg 6” NPT 150 7/16” 23 1/4” 36 1/2”48A/308 8X8 8” Flg. 8” Flg. 150 3/16” 25 3/4” 41 1/4”49A/308 8x8 8” Flg. 8” Flg. 150 7/16” 27 1/2” 41 1/4”

104S/38 - 166/45.5Dual Body Combination

Air Valve

801A - 804Wastewater

Single Body CombinationAir Valve

48A/301A - 49A/303ADual Body WastewaterCombination Air Valve

48A/304 - 49A/308Dual Body WastewaterCombination Air Valve * Inlet x Outlet

19


WASTEWATER COMBINATION AIR VALVES W/ BWA (SINGLE BODY)

ModelNumber

ValveSize

InletSize

Outlet Size

Air/Vacuum

CWPPSI

OrificeSize

Dimensions

A B

801ABW 2x1 2” NPT 1” NPT 150 1/8” 10 1/2” 23 1/16”802ABW 2x2 2” NPT 2” NPT 150 9/64” 14” 23 9/16”803ABW 3x3 3” NPT 3” NPT 150 11/64” 16” 30 1/2”804BW 4x4 4” NPT 4” NPT 150 11/64” 16” 33”

WASTEWATER COMBINATION AIR VALVES W/BWA (DUAL BODY)

ModelNumber

ValveSize

InletSize

Outlet Size

Air/Vacuum

CWPPSI

OrificeSize

Dimensions

A B

48A/301ABW 2x1 2” NPT 1” NPT 150 3/16” 28 1/4” 22 13/16”48A/302ABW 2x2 2” NPT 2” NPT 150 3/16” 29 1/2” 24 1/2”49A/302ABW 2x2 2” NPT 2” NPT 150 7/16” 35” 32”48A/303ABW 3x3 3” NPT 3” NPT 150 3/16” 35” 28 1/2”49A/303ABW 3x3 3” NPT 3” NPT 150 7/16” 35” 32”48A/304BW 4x4 4” Flg. 4” NPT 150 3/16” 34” 46”49A/304BW 4x4 4” Flg. 4” NPT 150 7/16” 34” 46”48A/306BW 6x6 6” Flg. 6” NPT 150 3/16” 36” 47”49A/306BW 6x6 6”Flg. 6” NPT 150 7/16” 36” 47”48A/308BW 8x8 8” Flg. 8” Flg. 150 3/16” 39” 53”49A/308BW 8x8 8” Flg. 8” Flg. 150 7/16” 39” 53”

801ABW - 804BWSingle Body Wastewater


48A/301ABW - 49A/303ABWDual Body Wastewater Combination Air Valve

48A/304BW - 49A/308BWDual Body Wastewater Combination Air ValveAir Valves are commonly found in plant service as well as pipelines

for efficiency and protection.

20


Anti-Slam Combination Air Valves (CAV) are equipped with an Anti-Slam Device which controls the flow of water into the air valve toreduce surges. This style of air valve provides pipelines with all of theprotection of a standard CAV plus the additional feature of regulatedclosure which prevents the CAV from being slammed shut duringcritical operation. By thus preventing the rapid closure of the valve,a shock or water hammer condition is prevented from occurringwithin the valve and possibly causing damage to the pipeline or valve.When equipped with an Anti-Slam Device, the sizing differentialpressure may be as high as 5 PSI (35 kPa) as opposed to the typical

2 PSI (14 kPa), thus resulting in the selection of a smaller valve.

The Anti-Slam Device is mounted on the inlet of the CAV. It allows air topass through it unrestricted during either the air discharge or air re-entrycycle. When water (because of its greater density) enters the Anti-SlamDevice, the disc will rapidly close and provide for slow closure of thefloat. The disc contains ports which allow water to flow through the antislam device when closed to fill the CAV with water at a controlled rate.The flow area of the anti-slam disc ports is typically about 5% of the fullport area and is adjustable by adding threaded plugs to the ports.

MATERIALS OF CONSTRUCTIONCOMPONENT STANDARD OPTIONAL

Body Cast Iron ASTM A126 Class B Ductile Iron ASTM A536 Gr. 65-45-12Trim Bronze ASTM B584, C83600 Stainless Steel ASTM A351, Grade CF8M

Exterior Coating Universal Primer Fusion Bonded Epoxy

FLOW CAPACITY OF ANTI-SLAM COMBINATION AIR VALVES

21


ANTI-SLAM COMBINATION AIR VALVES (SINGLE BODY)ValveSize Model Number Inlet Size CWP (PSI) Orifice SIze A B

1” 1201T/201C.2 1” NPT 250 5/64” 11 3/8” 13 5/8”2” 1202T/202C.2 2” NPT 250 3/32” 14” 17 1/4”3” 1203/203C.2 3” 125LB Flg. 300 3/32” 16” 23”4” 1204/204C.2 4” 125LB Flg. 300 3/23” 18 1/2” 26 1/4”

6”1206/206C 6” 125LB Flg. 150 3/8” 21” 30”1256/256C 8” 250LB Flg. 300 7/32” 21” 30”

8”1208/208C 6” 125LB Flg. 150 3/8” 25” 36”1258/258C 8” 250LB Flg. 300 7/32” 25” 36”

ANTI-SLAM COMBINATION AIR VALVES (DUAL BODY)ValveSize Model Number Inlet Size CWP (PSI) Orifice SIze A B

1” 1201T/101S/38.5 1” NPT 300 5/32” 14 1/2” 16 1/2”2” 1202T/102S/38.5 2” NPT 300 5/32” 16 1/2” 22 1/4”3” 1203T/103S/38.5 3” 125LB Flg. 300 5/32” 26 3/4” 16 3/4”

4”1204/104S/38 4” 125LB Flg. 150 3/16” 21” 29”

1254/154S/38.5 4” 250LB Flg. 300 5/32” 21” 29”

6”1206/106/38 6” 125LB Flg. 150 3/16” 22 1/2” 33”

1256/156/38.5 6” 250LB Flg. 300 5/32” 22 1/2” 33”

8”1208/108/38 8” 125LB Flg. 150 3/16” 27” 38”

1258/158/38.5 8” 250LB Flg. 300 5/32” 27” 38”

10”1210/110/45 10” 125LB Flg. 150 23/64” 33” 47”

1260/160/45.5 10” 250LB Flg. 300 7/32” 33” 47”

12”1212/112/45 12” 125LB Flg. 150 23/64” 37” 48 1/2”

1262/162/45.5 12” 250LB Flg. 300 7/32” 37” 48 1/2”

14”1214/114/45 14” 125LB Flg. 150 23/64” 40” 50”

1264/164/45.5 14” 250LB Flg. 300 7/32” 40” 50”

16”1216/116/45 16” 125LB Flg. 150 23/64” 44” 54”

1266/166/45.5 16” 250LB Flg. 300 7/32” 44” 54”

20”1220/120/45 20” 125LB Flg. 150 23/64” 51 3/4” 59 7/8”

1270/170/45.5 20” 250LB Flg. 300 7/32” 51 3/4” 59 7/8”

1201T/201C.2 - 1202/202C.2 Anti-Slam Single BodyCombination Air Valve

1203/203C.2 - 1204/204C.2Anti-Slam Single Body Combination Air Valve

1204/104S/38 - 1270/170/45.5 Anti-Slam Dual Body


1201T/101S/38.5 - 1203T/103S/38.5Anti-Slam Dual Body


1206/206C - 1258/258CAnti-Slam Dual Body



Vertical pumps have an air-filled discharge column when not

running. A well pump is typically submerged several hundred

feet and isolated from the pipeline by a check valve mounted

at ground level. When the pump is off, the water level in the

well drops to its static level allowing a large column of air to

collect in the pump column. In the absence of an air valve, the

air in the pump column would be pressurized upon pump start

up and forced through the check valve into the pipeline

causing air related problems. All vertical pumps should have

a Well Service Air Valve installed just

upstream of the check valve.


Body andCover

Cast Iron ASTM A126, Class BClass 125 and 250

Ductile Iron ASTM A536 Grade 65-45-12, Class 300

Stainless Steel, ASTMA351 Grade CF8M



WELL SERVICE AIR VALVE SIZING

VALVESIZE

NO HEAD PUMPCAPACITY, GPM

MODEL NUMBER150 PSI MODEL 300 PSI MODEL

1/2”0 - 200 100WS

0 - 350 100ST

1”201 - 500 101WS

351 - 1,350 101ST

2”501 - 1,200 102WS

1,351 - 4,000 102ST

3”1,201 - 2,000 103WS

4,001 - 7,000 103ST

4” 7,001 - 11,000 104WS 154WS

6” 11,001 - 24,000 106WS 156WS

8” 24,001 - 50,000 108WS 158WS

10” 50,001 - 70,000 110WS 160WS

12” 70,001 - 110,000 112WS 162WS

The purpose of the Throttling Device is to slow therelease of air and thereby slow the rise of water in thepump column. Dual Port Throttling Devices are standardon Well Service valves sizes 1/2” - 3” and optional onlarger valves when valve closure is rapid.

A Throttling Device has an exhaust disc which is typicallyadjusted between 5% and 30% open to control theventing rate. The valve needs to be set in the field andtuned to the operation of the pump. The ThrottlingDevice should be opened just enough so that all of theair is discharged before the check valve opens. Openingthe Throttling Device further will increase the pressuresurge in the pump column.

The Throttling Device also allows air to re-enter the pumpcolumn when the pump is stopped to prevent a vacuum. Avacuum can damage the seals in the pump or cause pumpdamage if it is restarted while the water is still dropping inthe well. To provide positive assurance against a vacuum,a Dual Ported Throttling Device is needed where thevacuum port is separate from the exhaust port.

If there is a common outlet, then the vacuum flow will begreatly restricted through the air discharge pipe. Thevacuum flow could also be stopped or contaminated ifthe air discharge pipe becomes submerged in a drain ora high wet well level. A Dual Port Throttling Deviceshould be used at all times.

DUAL PORTTHROTTLING

DEVICE

22

23

Well Service Air Valve w/ Dual Port Throttling Device

ModelNumber

ValveSize

InletSize

OutletSIze

CWPPSI

Dimensions

A B

100ST 1/2” 1/2” 1/2” NPT 300 6 1/8” 11 3/4”101ST* 1” 1” 1” NPT 300 7” 14 3/4”102ST* 2” 2” 2” NPT 300 9 1/2” 20 1/8”103ST* 3” 3” 3” NPT 300 9 1/2” 22 1/8”

Well Service Air Valve with Anti-SlamValveSize

ModelNumber Inlet Size Outlet Size CWP

PSI A B

4” 104WS154WS

4” 125lb Flg.4” 250lb Flg. 4”NPT 150

300 11 1/2 22 3/4

6” 106WS156WS

6” 125lb Flg.6” 250lb Flg. 6” NPT 150

300 14 28 1/2

8” 108WS158WS

8” 125lb Flg.8” 250lb Flg. 8” 125lb Flg. 150

300 17 1/4 35 5/16

10” 110WS160WS


300 20 1/4 40 1/16

12” 112WS162WS


300 24 44 5/16

*UL Listed


100ST - 103STWell Service Air Valve

104WS - 162WSWell Service Air Valve

DESIGN FEATURES

The 1/2” - 3” threaded inlet valves are equipped with a dual portthrottling device. The flanged inlet valves 4” and larger are equippedwith an anti-slam device. It is recommended that for in plantinstallations the threaded discharge of the valve be piped to a drainto accommodate any small amount of water that may be dischargedfrom the valve on closure. An optional well screen (WS) is availableto further dissipate the water velocities in the valve (sizes 1/2” - 3”.)

WELL SERVICE AIR VALVE OPERATION

Well Service Air Valves are similar to Air/Vacuum Valves and aredesigned to exhaust air on pump start-up and admit air upon pumpshut down. The valve is a normally open, float-operated valve thatvents or admits air at high rates. When water enters the valve, thefloat automatically rises and closes to prevent discharge of the water.As the last of the air is vented, water simultaneously strikes the airvalve and the closed check valve. If the flow velocity is high enough,surges will occur in the pump column and discharge pipe. Anti-SlamDevices and Throttling Devices are provided to control the rate of air

release and minimize surges, especially with slow opening, controltype check valves and to protect the Air Valve from pressure surges.

WELL SERVICE AIR VALVE INSTALLATION

Pump service is a severe application for air valves. The Well ServiceAir Valve is installed at ground level upstream of the check valve.When the pump is started, it runs for the first few seconds against lit-tle or no head. Hence, the actual flow rate can be as high as 150%of the normal flow rate while the air is being vented. Because of thedynamics involved, the air discharge is sonic and can cause water tobypass the rapidly closing air valve. Therefore, the valve outlet shouldbe piped back to the wet well or an open drain.

24

Val-Matic Vacuum Breaker Valves protect and maintain apipeline's structural integrity during vacuum conditions.Vacuums created by power failures, line breaks, andpressure surges are broken by the admission of largequantities of air through a Vacuum Breaker Valve. Thesevacuums are strong enough to collapse pipelines andstorage tanks. They also have the potential to drawcontaminates into the system through pipes and valves.When coupled with an Air Release Valve, large pockets of airare admitted into a line then slowly released through theRelease Valve. This creates a cushioning effect during surgeconditions limiting the impact the fluid has on a pipesystem. These valves can also be used to supplementconventional Air/Vacuum valves when conditions requiregreater intake capacity than exhaust capacity.


MATERIALS OF CONSTRUCTION CHARTMaterial Standard Optional

Body and CoverASTM A126

Class B Cast IronClass 125 and 250

Ductile IronASTM A536 Grade 65-45-12

Trim Bronze, ASTM B584,C83600

Stainless Steel ASTM A351,Grade CF8M


VENTING CAPACITY FOR VACUUM BREAKERS

FEATURES:

• FULL FLOW AREA• SIZES 2” - 24”• ANSI FLANGED CONNECTION• HOODED OR FLANGED AIR INLET• RESPONDS TO .25 P.S.I. PRESSURE DIFFERENTIAL• POSITIVE SYNTHETIC SEATING AT ALL WORKING

PRESSURES

OPTIONS:Flanged OutletAir Release Valve

25


VACUUM BREAKER WITH AIR RELEASE VALVEVALVESIZE

MODEL NUMBERA B

125 LB. CLASS (CWP) 250 LB. CLASS (CWP)3 1803VB/38 150 1853VB/38.5 300 16 154 1804VB/38 150 1854VB/38.5 300 17 3/8 15 7/85 1805VB/38 150 1855VB/38.5 300 18 3/4 16 3/46 1806VB/38 150 1856VB/38.5 300 20 17 1/48 1808VB/38 150 1858VB/38.5 300 22 3/4 18 1/4

10 1810VB/38 150 1860VB/38.5 300 25 5/8 19 3/412 1812VB/38 150 1862VB/38.5 300 28 3/4 19 1/814 1814VB/38 150 1864VB/38.5 300 30 7/8 19 7/816 1816VB/38 150 1866VB/38.5 300 33 3/4 21

VACUUM BREAKER PRESSURE/TEMPERATURE RATINGMAXIMUM NON-SHOCK PRESSURE, psig

MAXIMUM TEMPERATURE 150° F

ANSI CLASS 125 ANSI CLASS 250

2” - 12” 14” - 42” 2” - 12” 14” - 42”

200 150 400 300

T he unique seating design provides initial contact with the valvedisc and the Buna-N ring, providing a drop-tight seal. As thepressure increases, the Buna-N ring is compressed slightly and

the disc makes contact with the metal portion of the valve seat, preventingany further compression of the Buna-N ring. The Buna-N ring will continueto provide the “drop-tight seating” during the higher pressure ranges withoutdamage from the increased pressure loading.

VACUUM BREAKER WITH AIR RELEASE VALVEFOR WASTEWATER SERVICE

VALVESIZE

MODEL NUMBERA B

125 LB. CLASS (CWP)3 1803VBS/48A 200 16 20 5/164 1804VBS/48A 200 17 3/8 21 5/165 1805VBS/48A 200 18 3/4 22 1/166 1806VBS/48A 200 20 22 9/168 1808VBS/48A 200 22 3/4 23 9/16

10 1810VBS/48A 200 25 5/8 25 1/1612 1812VBS/48A 200 28 3/4 24 7/1614 1814VBS/48A 150 30 7/8 25 3/1616 1816VBS/48A 150 33 3/4 26 5/16

1803VB/38 - 1816VB/38Vacuum Breaker Valve

1803VBS/48A - 1816VBS/48AVacuum Breaker Valve

SEAT DETAIL

26

VACUUM PRIMING VALVES

COMPONENT MATERIALBody and Cover Cast Iron ASTM A126, Class B

Trim Stainless Steel, Type 316Exterior Coating Universal Alkyd Primer

Orifice Seal Buna-N

APPLICATION

Centrifugal pumps require that the pump housing and suctionpiping be filled with water or "primed" before they can be started.Vacuum priming systems are often used to draw air out of thepump housing and suction piping to create a vacuum therebyraising the water level until the pump is full of water or primed.

The purpose of the Val-Matic Vacuum Priming Valve is toautomatically allow air to be drawn out of the pumping system untilthe pump fills with water. Then, when the water reaches the primingvalve, the float rises and closes the priming valve to prevent fluidfrom flowing to the vacuum priming system. The priming valve willthen continue to release air while the pump is running.

DESIGN FEATURES

The Val-Matic Model 38P and 45P priming valves are designed specifically for priming service. The valve includes a longbody and skirted float to eliminate leakage caused by the high vacuum levels that occur at the valve outlet. All of the inter-nal trim is Type 316 Stainless Steel for long life, even in aggressive water.

OPTIONS

An optional Water Level Control Switch (WLCS suffix) is sometimes used to signal when the water level has reached the pumpor provide a warning that the pump has lost its prime (wet well is empty or suction line is blocked.) The flow switch has SPDTcontacts rated 5A @ 125/250 VAC, 3A Inductive @ 30 VDC, UL and CSA Listed Explosion Proof.

VAL-MATIC VACUUM PRIMING VALVESMODEL

NO.INLETSIZE

CWP,PSI

ORIFICESIZE A B

38P 2” NPT 150 3/16” 7” 15 5/16”

38P.2 2” NPT 75 5/16” 7” 15 5/16”

45P 2” NPT 150 23/64” 9 1/2” 12 1/4”

45P.3 2” NPT 75 1/2” 9 1/2” 12 1/4”

RECOMMENDED PIPINGARRANGEMENT

MATERIALS OF CONSTRUCTION

MODEL NUMBERS

38P - 45P.3Vacuum Priming Valve

27

VACUUM PRIMING VALVES

The table lists the capacities of the various valve orifices at a range of differential pressures from 0.5 in.mercury (.24 psi) to 29 inches mercury (14.2 psi). The required flow (SCFM) and the differentialpressure (inches-mercury) can be used to select an orifice size. The flow can be estimated bycalculating the volume of the suction piping and pump housing and dividing by the desired initialpriming time (typically 30 minutes). The sizing differential pressure is typically 10 in-hg but is affectedby the required lift of the water. For multiple pump applications, a priming valve should be installed ateach pump.

FLOW CAPACITIES FOR VAL-MATIC® PRIMING VALVES

PRESSUREDIFFERENTIAL

ACROSSORIFICE

INCHES HG*

RATE OF FLOW IN SCFM

No. 38P PRIMING VALVE No. 45P PRIMING VALVEORIFICE 3/16 ORIFICE 5/16 ORIFICE 23/64 ORIFICE 1/2

C.W.P. 150 C.W.P. 75 C.W.P. 150 C.W.P. 75.5 1.4 3.5 5.0 10.01 1.9 4.8 7.5 13.52 2.4 7.3 10.5 17.03 2.6 8.3 11.5 21.04 3.0 10.0 14.0 24.05 3.3 11.0 15.0 27.06 3.6 11.5 16.5 30.07 3.9 13.0 18.0 32.08 4.2 13.5 19.0 34.09 4.4 14.0 20.5 36.0

10 4.6 15.0 22.0 39.011 4.8 16.0 23.0 40.012 5.0 16.5 23.8 42.013 5.3 17.0 24.6 43.014 5.5 17.7 25.6 45.015 5.7 18.5 26.5 47.516 5.8 19.0 27.0 48.517 6.0 19.5 28.0 50.018 6.2 20.0 29.0 52.019 6.5 20.7 30.0 53.020 6.6 21.3 30.5 55.021 6.8 21.8 31.4 56.022 6.9 22.3 32.0 57.023 7.0 23.0 32.7 58.024 7.2 23.5 33.5 60.025 7.4 24.0 34.0 61.026 7.7 24.3 35.0 62.027 7.9 25.0 36.0 64.028 8.0 25.6 36.8 65.029 8.1 26.0 37.3 67.0

*Mercury

Documents

Air Valve Brochure