SPM-Dart-Valve-Manual.pdf

Copyright © S.P.M. Flow Control, Inc. 2013. All rights reserved. The manual must not be copied in whole or in part, in any form or by any means, and the information in it must not be disclosed to any person, or used for any purpose other than the specific purpose for which the manual has been provided, without the prior written consent of the company. SPM, DESTINY, Safety Iron, and DURALAST are trademarks of S.P.M. Flow Control, Inc.; WEIR is a trademark of Weir Engineering Services Limited

Document P/N: 2P36709

Release Date: 1/30/2013

Revision: B

SPM® Well Service Pumps & Flow Control Products

High Pressure Dart Style Check Valve Operation Instruction and Service Manual


Release Date 1/30/2013

Revision: B

2

WARNING:IMPORTANT SAFETY INFORMATION ENCLOSED. READ THIS OPERATING AND MAINTENANCE

INSTRUCTIONS MANUAL BEFORE OPERATING PRODUCT.

WARNING: THIS INFORMATION MUST BE AVAILABLE TO ALL PRESONNEL THAT WILL OPERATE AND MAINTAIN EQUIPMENT. FAILURE TO READ, UNDERSTAND AND FOLLOW THE OPERATING AND

MAINTENANCE INSTRUCTIONS MANUAL COULD RESULT IN SEVERE PERSONAL INJURY OR DEATH! Most SPM® products generate, control or direct pressurized fluids; therefore, it is critical that those who work with these products be thoroughly trained in their proper application and safe handling. It is also critical that these products be used and maintained properly!!

WARNING: MISUSE, SIDE LOADING, IMPROPER MAINTENANCE, OR DISASSEMBLY UNDER PRESSURE CAN

CAUSE SERIOUS INJURY OR DEATH! The following information is given in good faith and should aid in the safe use of your SPM® products. This information is not meant to replace existing Company's safety policies or practices. Personal Responsibilities:

1. When working on SPM® flow control products, safety glasses, approved safety shoes and hard hat must be worn.

2. Personnel should never hammer on any component when pressure is present. Hammering on any part

or component may also cause foreign material or steel slags to become airborne.

3. It is a personal responsibility to use the proper tools when servicing the valve. It is a personal responsibility to be knowledgeable and trained in the use and handling of tools for all maintenance of the valve.

4. Hot surface may be present; it is a person’s own responsibility to protect against burn injury.



Revision: B

3

On Location:

1. Each valve is clearly marked with a maximum pressure rating. This pressure must not be exceeded or SERIOUS INJURY OR DEATH CAN OCCUR!

2. The valve discharge connections should be properly cleaned and lightly oiled before the downstream

piping is attached. Any worn, damaged or missing seals should be replaced.

3. Welding, brazing or heating any part of the valve is prohibited. If accessories must be attached, consult Weir Oil & Gas factory prior to installation.

4. A complete visual inspection of the valve must be made prior to each use. Any leaking seals, broken

bolts, leaking hoses or improperly tightened parts must be remedied prior to using.

5. Any repairs or service (even routine maintenance) performed on the valve must be performed by a trained service technician who is qualified to work on high pressure flow control valves. All such service and repairs must be supervised by qualified management personnel or returned to Weir Oil & Gas for service. Only SPM® replacement parts should be utilized. Failure to do so may result in loss of warranty as well as SERIOUS INJURY OR DEATH!

Special Precautions:

1. The modifications to or unauthorized repair of any part of a SPM® valve, or use of components not qualified by Weir Oil & Gas, can lead to valve damage or failure and SERIOUS INJURY OR DEATH!

2. All SPM® threaded components are right hand threaded unless specifically designated otherwise. Any

turning counterclockwise will unscrew the assembly. Make sure all threaded components are assembled to the correct torque value.

3. All products should be properly cleaned, greased or oiled after each use and inspected prior to each use.

4. Each integral union connection is clearly marked with a pressure code (i.e. “1502”, 15,000 psi). This

pressure must not be exceeded. This code should also be used with mating unions. Improper mating can result in failures. All integral union connections used must match (according to size, pressure rating, etc.). These connections must also match the service of the designated string they are installed in.



Revision: B

4

CONTENTS

SECTION I: GENERAL INFORMATION ............................................................................................................. 5

THIS SERVICE MANUAL COVERS: ........................................................................................................................... 5 REBUILD KITS: .................................................................................................................................................. 5 PRODUCT DESCRIPTION: ................................................................................................................................... 7 GENERAL DESCRIPTION OF DART CHECK VALVE OPERATION: .................................................................................... 8 END CONNECTION OPTIONS: ............................................................................................................................ 9

SECTION II: INSTALLATION AND OPERATION .............................................................................................. 10

INSTALLATION: .............................................................................................................................................. 10 CALIBRATION GUIDE: ...................................................................................................................................... 12 PRESSURE/ TEMPERATURE RATINGS: ................................................................................................................... 12

SECTION III: MAINTENANCE AND REPAIR .................................................................................................... 13

MAINTENANCE REQUIREMENTS: ........................................................................................................................ 14 PREVENTATIVE MAINTENANCE – DISASSEMBLY: .................................................................................................... 18 PREVENTATIVE MAINTENANCE – DISASSEMBLY: .................................................................................................... 19 PREVENTATIVE MAINTENANCE – INSPECTING COMPONENTS: .................................................................................. 21 PREVENTATIVE MAINTENANCE – REPLACEMENT AND ASSEMBLY: .............................................................................. 25 VESSEL TEST PROCEDURES: ............................................................................................................................... 28 TROUBLESHOOTING GUIDE: ............................................................................................................................. 30

SECTION IV: SERVICE AND SUPPORT ........................................................................................................... 31

SERVICE CENTER ORDER INFORMATION: ............................................................................................................. 31 WEIR OIL & GAS LOCATIONS: .......................................................................................................................... 32



Revision: B

5

SECTION I: General Information This service manual covers: 1A20958C CHK VA/DRT/1-1502FXM/LT/C TYPE 1A20958CV CHK VA/DRT/1-1502FXM/LT/VIT/C 1A23773C CHK VA/DRT/1-1502MXF/METAL SEAL 1A20980C CHK VA/DRT/1.5-1502FXM/LT/C TY 1A20980CV CHK VA/DRT/1.5-1502FXM/LT/VIT/ 1A22423C CHK VA/DRT/1.5-1502MXF/LT/C TY 1A23444C CHK VA/DRT/1.5-1502MXF/METAL SEAL 1A18471C CHK VA/DRT/2-1502MXF/C TYPE 1A19467C CHK VA/DRT/2-1502FXM/C TYPE/H2S 1A19485C CHK VA/DRT/2-1502MXF/C TYPE/H2S 1A19660C CHK VA/DRT/2-1502MXF/LT/C TYPE 1A19662C CHK VA/DRT/2-1502FXM/LT/C TYPE 1A23085CLT CHK VA/DRT/2-1502FXM/METAL SEAL/C TYPE/L 1A24137C CHK VA/DRT/2-1502MXF/METAL SEAL 1A18611C CHK VA/DRT/3-1502FXM/C TYPE 1A18614C CHK VA/DRT/3-1502MXF/C TYPE 1A19826C CHK VA/DRT/3-1502FXM/C TYPE/H2S 1A19827C CHK VA/DRT/3-1502MXF/C TYPE/H2S 1A19843C CHK VA/DRT/3-1502FXM/LT/C TYPE 1A19845C CHK VA/DRT/3-1502MXF/LT/C TYPE

Rebuild Kits:

Full Parts Kits (Dart Kit and Valve stop, Valve stop O-ring, Body seal, set screw) 2L20823C KIT/PARTS/DRT/CHK VA/2”& 1.5”/C TYPE – STD SERVICE 15K 4L20823CV KIT/PARTS/DRT/CHK VA/2/VIT/C TYPE – STD SERVICE 15K 4L23935C KIT/PARTS/DRT/CHK VA/2/METAL SEAL – STD SERVICE METAL TO METAL 4L20824C KIT/PARTS/DRT/CHK VA/2/C TYPE/H2S – H2S SERVICE 10K 4L20825C KIT/PARTS/DRT/CHK VA/3/C TYPE – STD SERVICE 15K 4L20826C KIT/PARTS/DRT/CHK VA/3/C TYPE/H2S – H2S SERVICE 10K

Seal Kits (Seal O-ring, Valve seal, Valve stop o-ring, Body seal 4L20828C KIT/SEAL/DRT/CHK VA/1.5"&2"/C TYPE – STD SERVICE/ VITON 15K 4L20828CV KIT/SEAL/DRT/CHK VA/1.5"&2"/C TYPE – STD SERVICE/ VITON 15K 4L23939C KIT/PARTS/DRT/CHK VA/2/METAL SEAL – STD SERVICE METAL TO METAL 4L20829C KIT/SEAL/DRT/CHK VA/2/C TYPE/H2S – H2S SERVICE 10K 4L27355C KIT/SEAL/DRT/CHK VA/2/C TYPE/H2S – H2S SERVICE 15K 4L20830C KIT/SEAL/DRT/CHK VA/3/C TYPE – STD SERVICE 15K 4L20831C KIT/SEAL/DRT/CHK VA/3/C TYPE/H2S – H2S SERVICE 10K



Revision: B

6

Rebuild Kits Continued:

Dart Kits (Dart, Seal O-ring, Retainer Ring, Valve Seal, Nut, Spring) 4L19959 KIT/DRT/CHK VA/2” & 1.5” – STD SERVICE 15K 4L19959V KIT/DRT/CHK VA/2”& 1.5”/VIT– STD SERVICE/VITON 4L23938 KIT/DRT/CHK VA/2”& 1.5”/METAL SEAL 4L18824 KIT/DRT/CHK VA/2/H2S – H2S SERVICE 10K 4L18821 KIT/DRT/CHK VA/3 – STD SERVICE 15K 4L18818 KIT/DRT/CHK VA/3/H2S – H2S SERVICE 10K



Revision: B

7

Product Description: SPM® Dart Style Check Valves must be installed and maintained properly to perform as expected. When followed correctly, the information in this manual can both increase the working life of the Dart Style Check Valve and greatly reduce any risks involved during operation. The SPM® Dart Style Check Valve prevents flow in an undesired direction in high pressure lines, and is commonly placed in treating lines. This permits fluid to flow towards the well, while impeding back flow from traveling upstream the check valve. This independent pressure actuated response system works immediately following a pressure loss, requiring no operator to be present for initiation. This provides a safety device at various locations in the flow line and assures that pressure and fluid cannot backup into the manifold area or into the pumps. Manufactured to Weir Oil & Gas’ stringent Quality Assurance System, the Standard Service components are made from the appropriate heat treated, low alloy steels. Sour Gas components are made in accordance with American Petroleum Institute (API), Standard RP14-E, and National Association of Corrosion Engineers (NACE), std. MR0175-90. The SPM® Dart Style Check Valves are manufactured in 1 inch, 1.5 inch, 2 inch and 3 inch sizes. Each size features a standard and reverse flow version. The SPM® Dart Style Check Valve is available for both standard service and for sour gas (H2S) environments. The SPM® Dart Check Valves are available in various max pressure ranges from 10,000 to 15,000 psi. The valve is intended for well service applications such as acidizing, cementing, and fracturing, utilizing slick water frac fluids (containing no proppants), gels, mud, nitrogen (N2/Gas) or CO2.



Revision: B

8

General Description of Dart Check Valve Operation: The SPM® dart valve is constructed of a two piece body that houses an in-line spring loaded dart. When fluid enters from the inlet side, it will overcome the low spring force on the dart. The dart will travel away from the inlet and allow the fluid to flow around towards the outlet. When flow fluid stops, the light spring force closes the dart against its seat. If the pressure on the inlet side drops below that of the outlet, the fluid is kept from reversing its flow by the dart. The dart seal acts as a backup and creates a bubble-tight seal to eliminate any backflow.



Revision: B

9

End Connection Options: The SPM® 2 inch or 3 inch Dart Style Check Valves are available with SPM® wing union (integral) connections on the inlet and outlet sides. The inlet side will have a female wing union connection if a standard flow is specified or a male wing union connection for reverse flow. The outlet side will have the correspondingly opposite gender (i.e. Inlet/Female = Outlet/Male or Inlet/Male = Outlet/Female). Each Valve has a size and pressure code designated on the valve. The nameplate will indicate the cold working pressure allowable for each assembly. This working pressure corresponds to the maximum pressure acceptable for either end connection. Use this information for proper mating and pressure limits.

Wing union connections on check valves are interchangeable with other union connections of the same size and pressure rating. Caution must be taken to avoid mixing different pressure ratings of wing connections. These connections must also match the service of the designated string in which they are installed. Distraction or inability to observe good judgment may result in damage to components and create a life threatening situation. Always verify working pressure ratings of each connection before use.

WARNING: OBSERVE ALL INSTRUCTIONS, CAUTIONS AND WARNINGS AS NOTED IN THIS MANUAL. FAILURE TO DO SO CAN LEAD TO EQUIPMENT DAMAGE AND PERSONAL INJURY OR DEATH!



Revision: B

10

SECTION II: Installation and Operation Installation: The following information is given in good faith and should aid the safe use of your SPM® products. This information is not meant to replace any existing Company’s safety policies or practices, which should be strictly followed. The SPM® Dart Style Check Valve should be installed in a branch where a flow control device is necessary to prevent flow in one direction. For complete fluid shut-off, an isolator valve (such as the SPM® plug valve) should be installed in series with the dart check valve. Before assembly into a fluid line, check the direction of flow indicated by the arrow on the body and make sure the valve is properly oriented in the line. Improperly directed check valves will shut off fluid flow and can result in SERIOUS INJURY OR DEATH!

The SPM® dart valve can be installed in any orientation and still function properly. The internal spring constantly applies light pressure on the dart that prevents any effect gravity might have on the dart’s operation. The SPM® dart valve is specifically designed to be used with liquid frac, acidizing, cementing fluids, nitrogen (N2/Gas) or CO2. The SPM® Dart Style Check Valve is not intended for fluids that contain solids, such as proppants or ball sealers. Consult Weir Oil & Gas Engineering for information on substituting SPM® Clapper Style Check valves for those applications.



Revision: B

11

Installation (Cont.):

WARNING: OBSERVE ALL INSTRUCTIONS, CAUTIONS AND WARNINGS AS NOTED IN THIS MANUAL. FAILURE TO DO SO CAN LEAD TO EQUIPMENT DAMAGE AND PERSONAL INJURY OR DEATH!

Care must be taken when installing the SPM® Dart Style Check Valve so that a hammer never strikes the valve body. The body is not intended for severe forces, such as a hammer blow, and there is the danger that the valve could crack under such circumstances, which increases the chance of premature failure that could cause serious injury or death. Do not attempt to work on or repair any equipment isolated by the SPM® Dart Check Valve while the check valve has pressure or energized fluid behind it. A positive shut off device (i.e. plug valve) must be placed in the line to guarantee isolation from the system. Failure to do so could put operators in extremely hazardous situations without them being aware of the potential danger.



Revision: B

12

Calibration Guide: Refer to Vessel Testing section on page 28. Pressure/ Temperature Ratings: SPM® Dart Style Check Valves are available in the following configurations:

Valve Size Inlet Outlet Flow

Direction Pressure SVC Temperature Range (°F) Bore GPM BPM

1.5” 1.5”-1502F

1.5”-1502M Standard 15000 Std (-22 to 230) 1.25 160 3.8

2" 2"-1502F 2"-

1502M Standard 15000 Std (-22 to 230) 1.75 315 7.5

2" 2"-

1502M 2"-1502F Reverse 15000 Std (-22 to 230) 1.75 315 7.5

2" 2"-1502F 2"-

1502M Standard 10000 H2S (-22 to 230) 1.75 315 7.5

2" 2"-

1502M 2"-1502F Reverse 10000 H2S (-22 to 230) 1.75 315 7.5

3" 3"-1502F 3"-

1502M Standard 15000 Std (-22 to 230) 2.5 643 15.3

3" 3"-

1502M 3"-1502F Reverse 15000 Std (-22 to 230) 2.5 643 15.3

3" 3"-1502F 3"-

1502M Standard 10000 H2S (-22 to 230) 2.5 643 15.3

3" 3"-

1502M 3"-1502F Reverse 10000 H2S (-22 to 230) 2.5 643 15.3 Note: Some of the SPM® dart valve models are offered with a higher temperature VITON seal that operates between temperatures of 0°F - 390°F. Ask our nearest service center about availability if desired parts are to be used in higher temperature applications.

WARNING: DISASSEMBLY UNDER PRESSURE CAN CAUSE SERIOUS INJURY OR DEATH!



Revision: B

13

SECTION III: Maintenance and Repair

WARNING: DISASSEMBLY UNDER PRESSURE CAN CAUSE SERIOUS INJURY OR DEATH! WARNING: OBSERVE ALL INSTRUCTIONS, CAUTIONS AND WARNINGS AS NOTED IN THIS MANUAL. FAILURE

TO DO SO CAN LEAD TO EQUIPMENT DAMAGE, PERSONAL INJURY OR LOSS OF LIFE.

ALWAYS REMEMBER:

1. Always wear PPE (personal protective equipment). 2. Only qualified technicians should perform maintenance on Weir Oil & Gas products. 3. Always use SPM® supplied new parts kit for reassembly. 4. Clean all components thoroughly prior to reassembly. 5. Check sealing surface area of valve gate and nozzle for pitting, erosion or other flaws. Failure in sealing

can result if these areas are not smooth. 6. Use only SPM® dart valve parts on SPM® dart valves. 7. This device is intended to discharge atmospherically when it relieves.



Revision: B

14

Maintenance Requirements: SPM® Dart Check valves are well designed, dependable components that should provide long term, reliable performance for the user. Like any device, however, they do require routine inspection and servicing to assure that they are fully functional. The more severe the usage, the more often maintenance is required. It is recommended that a flow rate in excess of 42 ft/sec be avoided. Rates above this will cause more rapid wear and erosion. Any check valve that has been exposed to high shock loads (i.e. overpressure, standoffs, etc.) should be removed from service until ultrasonic checks and pressure testing can be performed. Valves used in areas of high acid concentrations require special attention to inspection and maintenance. Due to the harsh field environment where this dart check valve will be used, it is imperative that maintenance of this valve be HIGH Priority to ensure repeatability. WELDING, BRAZING OR HEATING CHECK VALVES IS PROHIBITED. Material Damage will occur. Valve unions should be clean and lightly oiled prior to each use. Union seals should be checked and replaced when worn or damaged. Always flush valve with water, then oil after each use. If valves are used with acid, services, they should be washed with fresh water as soon as possible. After washing, it is recommended that it is submersed in light oil for 5 minutes. It is impossible to visually inspect components from the outside. Consequently, the valves should be disassembled and inspected at least every 90 days. Any signs of pitting or washing on the body and components require replacement. Dart assemblies should be replaced regularly (approx. every 90 days or sooner depending the type and amount of use). Dart valve seats should be checked for corrosion. If evidence exists, replace valve inlet. There are wear surfaces on this device and elastomeric seals that require maintenance. For the valve to operate properly and safely, these items must be kept in good condition. Inspection and servicing should be conducted in accordance with a recognized program. The components that require inspecting are listed below and referenced on the bill of materials on page 14 and 15. (The components that must be replaced during a re-kitting are highlighted in yellow)

Seal O-ring (10) Valve Seal (8) Valve Stop O-ring (14) Body Seal (15) Union Seal (6) Dart (7) Valve Stop (13) Valve Spring (12) Seal Retainer (9) Hex Nut (11)



Revision: B

15

Maintenance Requirements (Cont.):



Revision: B

16

BOM TABLE 1A19662C BOM ID QTY PART NUM DESCRIPTION

1 1 2P19652 INLET/CHK VA/DRT/2-1502F 2 1 1P19658 OUTLET/CHK VA/DRT/2-1502M 3 1 3P10228 WING NUT/2-1502 4 3 3P10231 RET SEG/2-1502 5 1 P10232 RET RNG/2-1502 6 1 4P10229 SEAL RNG/UNION/2 7 1 3P19650 DART/CHK VA/2 8 1 3P18476 SEAL/CHK VA/DRT/2/BUNA 9 1 3P18477 RET/SEAL/CHK VA/DRT/2

10 1 P19185 SEAL/OR21323813 11 1 3P23924 NUT/CHK VA/DRT/2-3/MECH LOCK 12 1 3P18478 SPRNG/CHK VA/DRT/2 13 1 3P18479 STOP CHK VA DRT 2 14 1 P18481 SEAL/OR36338813 15 1 2P25478 SEAL/D-RING/1.5-2/DART CHK VA 16 1 P19275 SCRW/HHCS/ .50-13NC X 1.00/G8 17 1 3P22546 KEY CHK VA DRT 2-3 LONG 18 1 3P14871 NAMEPLT/VALVE

19 2 P18055 SCRW/DRV/4 X 3/16/TYPE U



Revision: B

17



Revision: B

18

Preventative Maintenance – Disassembly:

WARNING: MAKE SURE THAT THERE IS NO PRESSURE ON THE VALVE!



Revision: B

19

Preventative Maintenance – Disassembly:



Revision: B

20

NOTE: This was the disassembly procedure for the 2” dart valve. The ASSEMBLY and DISASSEMBLY procedures for the 2” and 3” Dart Check Valves are virtually identical. Other than component size, there is only one main difference: The 2” inlet has male threads that thread INTO the female threads of the 2” outlet The 3” inlet has female threads that thread OVER the male threads of the 3” outlet



Revision: B

21

Preventative Maintenance – Inspecting components:



Revision: B

22

Preventative Maintenance- Inspecting components (Cont.):



Revision: B

23




Revision: B

24




Revision: B

25

Preventative Maintenance – Replacement and assembly: 2” & 3” Sizes. Also see SPECIAL NOTE for 3” -See ALWAYS REMEMBER Section on page 11 before disassembling or assembling. -The reassembly of the valve is in approximate reverse order to the disassembly process.



Revision: B

26

Preventative Maintenance – Replacement and assembly (Cont.):



Revision: B

27

Preventative Maintenance – Replacement and assembly (Cont.):



Revision: B

28

Vessel Test Procedures:



Revision: B

29

Field Testing When pressure testing, the pressure should be applied to the total body as well as the check system side.

Pressure testing should be done with cold water. Personnel should wear proper safety equipment and avoid any area of danger while pressure is present. Prior to any pressure testing, all air must be evacuated from the

system. Failure to do so could result in PRESONAL INSURY OR DEATH.

THE RATED WORKING PRESSURE IS NEVER TO BE EXCEEDED DURING FIELD SERVIVE OR FIELD TESTING. OBSERVE ALL INSTRUCTIONS, CAUTIONS AND WARNINGS AS NOTED IN THIS BROCHURE. FAILURE TO DO SO CAN LEAD TO EQUIPMENT DAMAGE, PERSONAL INJURY OR LOSS OF LIFE. Pressure testing (and ultrasonic test) should be performed every 6 months or more frequently if service is “severe” or “low temperature”. It is necessary to test each valve for leaks after they are refurbished. To test for leaks:

Fill the valve with liquid (Water) Make sure that all air is out of the system

o This is extremely important as stored air compresses at high pressures and stores energy, increasing the danger involved with a failure.

Pressurize the system up to slightly less than working pressure (to prevent exceeding working pressure) With the valve near working pressure, carefully examine for leaks

If no leaks are observed, the valve is now ready for service.



Revision: B

30

Troubleshooting Guide:

Always follow existing Weir Oil & Gas procedures concerning identifying equipment for inspection, and removing equipment from service. The following is intended as a general guide in helping resolve most problems encountered in repairing SPM® Dart Valves. If problems not covered here are encountered, contact Weir Oil & Gas for assistance at (817) 246 2461

SYMPTOM PROBLEM SOLUTION

1. Valve leaks past threads between valve inlet and outlet

a) Polypak seal damaged and will not seal

a) Replace and reinstall damaged olypak seal correctly. See proper seal orientation.

b) Polypak seal installed incorrectly b) Replace and reinstall damaged olypak seal correctly. See proper seal orientation.

2. Valve leaks from dart seal area but dart appears to be seating

correctly

a) Dart seal area or inlet area where dart makes contact is worn out or damaged.

a) Remove valve from service. Inspect parts and replace inlet or dart as needed.

b) Valve seal or seal o-ring have worn out or are damaged

b) Rubber components are considered expendable and should be replaced

c) Obstruction between dart (and or seals) and valve inlet is preventing complete seal

c) Flush dart valve assembly with clean water. If necessary, disassemble valve and clean individual parts. Remove all debris. Replace rubber components, reassemble.

3. Valve leaks from dart seal area and dart valve appears to fully

close or seat

a) Dart cannot fully close because rust exists between dart shaft and valve stop guide hole.

a) Disassemble the valve. Clean rust affected parts with fine steel wool or sandpaper. If rust pits or other damage to parts exist, replace parts as needed. Dart should slide freely through guide hold in valve stop.

b) Obstruction between dart assembly and valve inlet seal surface prevents dart from sealing

b) Flush dart valve assembly with clean water. If necessary, disassemble valve and clean individual parts. Remove all debris. Replace rubber components and reassemble.

c) Valve spring is damaged or worn and cannot apply enough force to fully close dart assembly.

c) Replace valve spring.

4. Dart assembly does not open

fully to allow flow

a) Obstruction preventing dart to fully open

a) Flush dart valve assembly with clean water. Disassemble valve and examine for debris. Remove any obstructions & reassemble.

b) Dart shaft and valve stop guide hold are rusted together

b) Clean components with fine steel wool or sandpaper. Oil lightly. Replace as needed.

5. Dart and or seals experience rapid deterioration

a) Excessive component wear caused by excessive flow rate

a) Reduce flow rate (or contact Weir Oil & Gas representative for a heavier spring recommendation)



Revision: B

31

SECTION IV: Service and Support

Service Center Order Information: Weir Oil & Gas stocks a large inventory of genuine “original equipment” replacement parts. In order to expedite a parts order and avoid any delays, please provide the following information with your order:

The part number and description (refer to drawings and parts lists in this section) of each item ordered. The quantity of each part, kit, or assembly ordered. The model number and serial number Your purchase order number. Specify method of shipment, complete shipping address, complete billing address and telephone

number at the destination of the shipment. Parts and service may be ordered through the following locations. Copyright © S.P.M. Flow Control, Inc. 2013. All rights reserved. The manual must not be copied in whole or in part, in any form or by any means, and the information in it must not be disclosed to any person, or used for any purpose other than the specific purpose for which the manual has been provided, without the prior written consent of the company. SPM, DESTINY, Safety Iron, and DURALAST are trademarks of S.P.M. Flow Control, Inc.; WEIR is a trademark of Weir Engineering Services Limited

Weir Oil & Gas 601 Weir Way Tel: (817) 246 2461 Fort Worth Fax (817) 246 6324 TX 76108 USA www.weiroilandgas.com

Documents

SPM-Dart-Valve-Manual.pdf