CAT-684 1 28 - edelflex.com · b j e c t t o a l t e r a t i o n VALVES, ACTUATORS AND CONTROL SYSTEMS R DIN EN ISO 9001 CERT Zertifikat: 5027 Diaphragm Valve 2/2-Way - Pneumatically

R 684C

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VALVES, ACTUATORSAND CONTROL SYSTEMS

R DIN EN ISO 9001 DIN EN ISO 9001

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Zertifikat: 5027Zertifikat: 5027

Diaphragm Valve 2/2-Way - Pneumatically Operated

Introduction

Pneumatically Operated Weir Type Diaphragm Valve, 2/2-way, metal construction. Sealing is effected by a flexible diaphragm (made of elastomeric or plastic material or combinations thereof), which when fully closed seats against the weir under pressure from the compressor to provide a cushioned, positive driptight shutoff. Because of its smooth body geometry, linings are available with high chemical and abrasion resistance. The valve is operated by a maintenance-free diaphragm actuator, which can be controlled by any inert liquid or gas. The GEMÜ 684 diaphragm valve features compact design and high flow performance and it is the ideal Pneumatic Valve for controlling and/or shutting off of practically all kinds of neutral or corrosive liquid or gaseous fluids, w ith or without solids in suspension.

DIN EN ISO 9001 DIN EN ISO 9001

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Diaphragm Valve 2/2-Way - Pneumatically Operated

R 684

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Construction

Advantages

n Bubbletight shutoff. The diaphragm will accommodate itself to grit, rust, slurry or fibrous particles present in the line.

n Good throttling of highly corrosive or abrasive media when the valve is equipped with a positioner.

n Lower initial price. No special alloy working parts are required.n Long trouble-free operation and lower operating cost. High operating efficiency on

account of low pressure drop and streamline flow.n Long life rugged maintenance-free actuators.n No stuffing box to repack or packing gland to adjust.n Lower maintenance cost/easy in line maintenance. The diaphragm is replaced quickly

and easily without the need to remove the body from the pipeline.n Possibility of replacement of other diaphragm valves (other manufacturer) already

installed, as there is a wide range of standards and types of connections.n The valve can be installed in any position in the pipeline and used in both directions of

flow (bidirectional). n Wide interchangeability of bonnet assemblies and diaphragms.n Out and out durability and efficiency.

Applications

Depending on the material of the valve body or lining and the diaphragm used, the valve can be used for shutting off and/or regulating flow of practically any liquid or gaseous fluid, either neutral or aggressive and with or without solid elements in suspension. E.g. in the chemical process industry, mining, power generation (demineralizers, radioactive waste handling, condensate polishers) water treatment and filtration systems, electroplating, in the iron and steel industry, food industry, beverages, paints, leather, semiconductors, pharmaceutical, textiles, alcohol and sugar, pulp and paper.

The valve is compact and strong with a single body, a metal pneumatic actuator and a resilient rubber diaphragm. When the GEMÜ 684 is fully opened, it has the largest flow passing through area than any other typicall flow controlling valves. The flow to be controlled only contacts the body/lining and the diaphragm. The diaphragm has basically for on-off service two functions both to cut off the flow and to isolate the working parts from the media. When the valve is designated for flow control service (throttling) the diaphragm has a third function i. e. to modulate the flow rate within desired parameters by means of a positioner (See GEMÜ Control Valves Catalog for more details). Due to Valve body design (no pockets, crevices, grooves or recesses), there are no sharp changes in the direction of the flow, the quality of fluid is preserved (especially those fluids that might undergo decomposition and/or contamination) and it is easy to be cleaned internally. This valve is available with diameters of 15 to 50 mm (1/2" to 2”), flanged, cast iron, stainless steel or other material (on request). Different types of lining are available for the valve body that widen alternatives for using this valve such as PVDF, Polypropylene, PFA (Teflon), glass, ebonite (hard rubber), ECTFE (Halar), Hypalon, Butyl, Neoprene, Natural Rubber and Derakane, among others. The diaphragm, as well as the lining may also be supplied in different materials such as Hypalon, Buna N, Viton, PTFE (Teflon), Butyl, Neoprene, EPDM and Natural Rubber. The actuators provide reliable and efficient automatic process control and were designed to combine minimum space and weight with maximum economy. The following standard on-off actuator control functions are available: Normally closed by springs- Air Open; Normally open by spring - Air Close and Double acting (Air Open - Air Close), special cases on request. The range of applications can be extended by means of accessories, such as: Pneumatic and Eletro-pneumatic valve positioners, optical and electrical position indicator, adjustable travel stop, adjustable opening stop, handwheel opening device, handwheel closing device, etc.

Construction Details and Advantages

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Actuator Cover(It’s rugged and provides maximum strength).

Diaphragm plate.

Control Diaphragm(tough and long lasting)

bushing (provides smooth operation).

Polished Stem (Spindle) of stainless steel (provides smooth operation and durability).

G E M Ü s t a n d a r d nitrocellulose lacquer or epoxy paints (other special paint on request).

Lining of the body of different m a t e r i a l s s u c h a s Thermoplastics (PP, PVDF, PFA), or of Natural/Synthetic Rubber, or yet Glass or ECTFE (Halar).

Connection for control medium.

Metal thread for accessory attachment.

Spring (or set of springs).

Metal distance piece.

Compressor

Bichromatized carbon steel fasteners (stainless steel on request)

Diaphragm. Available in different types of material (It provides airtight seal even with maximum operating pressure, as well as atmospheric sealing.)

Strong metal body with excellent Kv’s. (Available in several standards and connections).

DIAPHRAGM VALVE 684RS

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Technical Data for Ordering

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DIAPHRAGM VALVE 684R


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Flanged ANSI B16.5, class 150, RF (smooth finish).Face-to-face ISO 5752 (short) or BS 5156 56

57Flanged ANSI B16.5, class 150, FF (smooth finish).Face-to-face ISO 5752 (short) or BS 5156

58Flanged ANSI B16.1, class 125, FF (smooth finish).Face-to-face ISO 5752 (short) or BS 5156

50Flanged BS 10 Tab “D”, FF (smooth finish).Face-to-face ISO 5752 (short) or BS 5156

51Flanged BS 10 Tab. “E”, FF (smooth finish). Face-to-face ISO 5752 (short) or BS 5156

70Socket weld ANSI B16.11 (SW)

Two-way body with inlet and outlet on the same axis D

Body Configuration Ref. No.

04Flanged DIN 2532 PN 10, RF, C , Face-to-face DIN 3202 ( series )

formF1

Threaded socket DIN ISO 228 (BSP) 01

Threaded socket NPT 31

Flanged DIN 2532 PN 10, FF, form (smooth finish)Face-to-face ISO 5752 (short) or BS 5156

A 52

Flanged DIN 2532 PN 10, RF, form Face-to-face ISO 5752 (short) or BS 5156

C 54

38

39Flanged ANSI B16.5, class 150, RF (smooth finish).Face-to-face ISO 5752 (long)

45Flanged ANSI B16.1, class 125, FF (smooth finish).Face-to-face MSS SP-88

Flanged ANSI B16.5, class 150, RF (smooth finish).Face-to-face MSS SP-88

44Flanged ANSI B16.5, class 150, FF (smooth finish).Face-to-face MSS SP-88

Valve Connection Ref. No.

Product Category Ref. No.

Valve V

0684

Product Type Ref. No.

GENERAL DATA

Note:Other Connections, e.g. ends for butt welding (BW), on request.

* Depending on the connection or on body or lining material, some of the above-indicated diameters of the valve are not available. Refer to the tables "Valve Body Dimensions" on pages 12,13,14,15 and 16 for the available versions.

**Kv (data relative to valves without lining and with diaphragm material from 1 to 15).Ref. No.

Note:In case of any doubt see the document “GEMÜ BR Product figure number code system”

SPECIFICATION AND CODING

1/2"

3/4"

1"

1.1/4"

1.1/2"

2"

32

40

50

15

20

25

80

7.0

14

20

36

40

032040

050

015020025

(In.)(mm) Kv (m³/h)**

Nominal Size* (DN) Ref. No.

64Flanged BS 10 Tab “F”, FF (smooth finish).Face-to-face ISO 5752 (short) or BS 5156

Working Medium: According to body material, lining and sealing (diaphragm), any neutral or corrosive liquid or gaseous fluid.

Maximum permissible temperature of working medium: 150ºC(Maximum limit may vary according to the diaphragm and lining material)

Maximum working Pressure: 10 barMay be lower due to the valve diameter or diaphragm type - see the table of working pressures on pages 06,07,08 and 09/26.

Control Medium : Any inert gas (usually compressed air) or liquid (see Note II below)

Maximum permissible temperature of control medium: 80ºC

Maximum permissible pressure of control medium: 7 bar

Note:I)Refer to the document "GEMÜ general technical data on metal diaphragm valves” and the “GEMÜ Table of chemical resistance" for correct selection of materials.

II)When water instead of compressed air is to be used in the actuator a special actuator version is provided ( consult the nearest GEMÜ sales office)

GEMÜ 684 Pneumatically Operated weir type Metal Diaphragm Valve


010101

11Cast carbon steel ASTM A 216 Grade WCB

Cast iron DIN 1691 GG 25 08

15Ductile iron DIN 1693 GGG 50 with PVDF lining (At least 3.0 mm thick).

16Ductile iron DIN 1693 GGG 50 with hard rubber lining (Ebonite).

17Ductile iron DIN 1693 GGG 40.3 with

PFA-TEFLON lining (at least 3.0 mm thick).®

18Ductile iron DIN 1693 GGG 50 with Polypropylene lining (at least 3.0 mm thick)

316 Stainless steel investment cast ASTM A 351 CF8M

37

316L Cast stainless steel ASTM A 351 Grade CF3M 44

316 Cast stainless steel ASTM A 351 Grade CF8M 47

13Cast iron DIN 1691 GG 25 with hard rubber lining (Ebonite).

316L Stainless steel investment cast ASTM A 351 CF3M (Fe <1,0%)

34

CSM Hypalon (Chlorine Sulphonyl Polyethylene Rubber) 01

NBR Perbunan (Nitrile Butadiene Rubber) 02

FPM Viton (Fluorine Rubber) 04

CR Neoprene (Chloroprene Rubber) 08

CR Neoprene (S Chloroprene Rubber)ilica free 09

06IIR (Butyl Rubber)

14EPDM Ethylene Propylene Rubber

15NR Natural Rubber.

05® PTFE Teflon (Polytetrafluorethylene) with partially adhered EPDM backing cushion

® PTFE Teflon (Polytetrafluorethylene) with partially adhered FPM (Viton) backing cushion

V5

MaterialDiaphragm Ref. No.

Body/Lining Material Ref. No.

50Cast iron DIN 1691 GG 25 with glass lining

52Cast iron DIN 1691 GG 25 with soft natural rubber lining

54Cast iron DIN 1691 GG 25 with Derakane lining

55Cast iron DIN 1691 GG 25 with ECTFE (Halar) coating

Cast iron DIN 1691 GG 25 with Hypalon lining 56

Cast iron DIN 1691 GG 25 with Neoprene lining 57

Cast iron DIN 1691 GG 25 with Butyl lining 58

Cast iron DIN 1691 GG 25 with silica free natural rubber lining

Cast iron DIN 1691 GG 25 with graphite hard rubber lining

59

63

Ductile iron DIN 1693 GGG 50 with Derakane lining 94

Ductile iron DIN 1693 GGG 50 with Neoprene lining 97

Ductile iron DIN 1693 GGG 50 with Hypalon lining 96

Note:Other materials for body and lining on request.

Ductile iron DIN 1693 GGG 50 with Butyl lining 98

Note:Other materials for Diaphragm on request.

DIAPHRAGM VALVE 684RC

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Ductile iron DIN 1693 GGG 50 with soft natural rubber lining

92

Fig. 1

FluxoBloqueado

Fig. 3

Fig. 2



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The figures below show the available control functions of GEMÜ 684 Diaphragm valve for ON-OFF control, i.e. Closed position or fully open position.

The choice of control function is determined by the user according to the process need.


NC Normally Closed by springs (Air to open)If failure occurs in pneumatic control system, theactuator will return the valve to closed position.

1Fig. 1

Control Function Ref. No.

2NO Normally Open by springs (Air to close)

If failure occurs in pneumatic control system, theactuator will return the valve to open position.

3DA Double Acting (Air to open - Air to close)

Fig. 2

Fig. 3


Control Function : Ref. No. 1-NC Normally closed by springs)(air to open)

Control Function : Ref. No. 2-NO

Control Function : Ref. No. 3-DA

Normally open by springs(air to close)

Double Acting(Air to open - Air to close)

Stopped Flow Max. Workingmedium rate of flow.

Depressurizedlower chamber

Air pressure applied to the lower chamber.

Depressurizedupper chamber

Air pressure applied to the upper chamber.

Max. Workingmedium rate of flow.

Stopped Flow

Depressurizedlower chamber.

Depressurizedupper chamber.

Air pressure applied to the upper chamber.

Air pressure applied to the lower chamber.

Max. Workingmedium rate of flow.

Actuator designed to operate from a normally closed position.

Actuator designed to operate from a normally open position.

Stopped Flow

Technical Data for Ordering (Normally Closed Valves)




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Actuators with Ref. No.: 1A3

Actuators with Ref. No.: 2A2 and 2A3

Diâmetro Nominal

(mm) (pol.)

Maximun Workingpressure ** (bar)

Diaphragm Material (code)

ACTUATOR

Ref. No.

NominalSizeDN

ControlPressure

(bar)Max. Stroke01,02,04,06,08

09,14, and 1505 and V5

Filling volume:

Actuators with Ref. No.: 1A3 = 0,15 l

Actuators with Ref. No.: 2A2 and 2A3 = 1,10 l

* Weigths are aproximate and only for cast iron body. Materials with other than iron densities should have their respective weights increased/reduced in the same proportion.

** The above mentioned pressures are given as gauge pressures (positive), when applied upstream only (100% pressure drop)

Note: Valves for use in vacuum are available only on request.

ACTUATOR SIZING FOR GEMÜ 684 DIAPHRAGM VALVEWith Control Function: Air to open (Normally closed by springs) Ref. No.: 1

“on-off Service”

15

20

25

32

50

40

1/2"

3/4”

1”

1.¼”

2”

1.½”

10,0

10,0

10,0

10,0

10,0

10,0

1A3

1A3

1A3

2A2

2A3

2A2

5,0 - 7,0

4,5 - 7,0

5,0 - 7,0

4,5 - 7,0

5,0 - 7,0

5,0 - 7,0

Other valve combinations are possible, on request.

10,0

10,0

10,0

8,0

8,0

8,0

Connection for control medium 1/4” BSP (supply air to open)


Lower Chamber

Lower Chamber

Weight * (Kg)

16,4 11,6

4,5 3,5

6,2 4,6

6,5 4,9

13,6 10,3

14,1 10,8

ConnectionFlangeCode

52, 54, 56,57, 58 and

69


04 and 08

ConnectionThreadCode

01, 31 and 70

15,3

4,3

5,3

5,6

11,8

12,3

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Technical Data for Ordering (Normally Open Valves)




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Actuators with Ref. No.: 1AF

Actuators with Ref. No.: 2AF

Diâmetro Nominal

(mm) (pol.)


Diaphragm Material (code)ACTUATOR

Ref. No.

NominalSizeDN

ControlPressure

(bar)01,02,04,06,0809,14, and 15

05 and V5

Filling volume:

Actuators with Ref. No.: 1AF = 0,15 l

Actuators with Ref. No.: 2AF = 1,10 l

* Weigths are aproximate and only for cast iron body. Materials with other than iron densities should have their respective weightsincreased/reduced in the same proportion.



ACTUATOR SIZING FOR GEMÜ 684 DIAPHRAGM VALVEWith Control Function: Air to close (Normally open by springs) Ref. No.: 2


15

20

25

32

50

40

1/2"

3/4”

1”

1.¼”

2”

1.½”

10,0

10,0

10,0

10,0

10,0

10,0

1AF

1AF

1AF

2AF

2AF

2AF

Max. 7,0

(See diagrams No. 1, 2 on page 09/26)


10,0

10,0

10,0

8,0

8,0

8,0

Connection for control medium 1/4” BSP (supply air to close)

Connection for control medium 1/4” BSP (supply air to close)

Upper Chamber

Upper Chamber

Weight * (Kg)

16,2 11,415,1

4,3 3,34,1

6,0 4,45,1

6,5 3,95,4

13,4 10,111,6

13,9 10,112,1


52, 54, 56,57, 58 and

69


04 and 08


01 ,31 and 70

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Technical Data for Ordering (Double Acting Valves)




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Actuators with Ref. No.: 1AD

Actuators with Ref. No.: 2AD

Diâmetro Nominal

(mm) (pol.)


Diaphragm Material (code)ACTUATOR

Ref. No.

NominalSizeDN

ControlPressure

(bar)01,02,04,06,0809,14, and 15

05 and V5

Filling volume:

Actuators with Ref. No.: 1AD = 0,15 l

Actuators with Ref. No.: 2AD = 1,10 l

* Weigths are aproximate and only for cast iron body. Materials with other than iron densities should have their respective weights increased/reduced in the same proportion.



ACTUATOR SIZING FOR GEMÜ 684 DIAPHRAGM VALVEWith Control Function: Double acting (Air to open - Air to Close) Ref. No.: 3


15

20

25

32

50

40

1/2"

3/4”

1”

1.¼”

2”

1.½”

10,0

10,0

10,0

10,0

10,0

10,0

1AD

1AD

1AD

2AD

2AD

2AD

Max. 7,0

(See diagrams No. 1, 2 on page 09/26)


10,0

10,0

10,0

8,0

8,0

8,0

(supply air to close)


(supply air to close)


Lower Chamber

Lower Chamber

Upper Chamber

Upper Chamber

Weight * (Kg)

16,1 11,315,0

4,2 3,24,0

5,9 4,35,0

6,4 3,85,3

13,3 10,011,5

13,8 10,012,0


52, 54, 56,57, 58 and

69


04 and 08


01, 31 and 70

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Working pressure (bar)

Diagram 1- Actuators with Ref. Nº. 1AF and 1AD (see note below)

Co

ntr

ol p

ress

ure

(ba

r)

1

2

3

4

5

6

7

8

9

1 2 3 4 5 6 7 8 9 10

Máx. control pressure





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Working pressure (bar)

Diagram 2- Actuators with Ref. Nº. 2AF and 2AD (see note below)

Co

ntr

ol p

ress

ure

(ba

r)

1

2

3

4

5

6

7

8

9

1 2 3 4 5 6 7 8 9 10

Máx. control pressure

Note : i) In the diagrams above, for the normally open actuators i.e. , 1AF and 2AF the necessary control pressure is given in accordance with the working pressure (line pressure). For double acting actuators i. e. 1AD and 2AD the necessary control pressure can be 0,3 bar less than that given in the diagrams.

II) The pressure data above are valid for elastomeric diaphragms . For teflon diaphragms (codes 05 and V5) apply a factor 1,2x to the control pressure rating obtained from the diagrams.

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DN 32mm (1.1/4”)

DN 40mm (1.1/2”)

DN 50mm (2”)

DN 15 mm (1/2”)

DN 20 mm (3/4”)

DN 25 mm (1”)

ORDER EXAMPLE (GEMÜ 684 Diaphragm valve Figure Number Composition)

Product Type

Product Category

0684

0684

050

050

D

D

58

58

08

14

1

2A3

2A3

11408

Nominal Size (DN)

Body Configuration

Valve Connection

Body/Lining Material

Diaphragm material

Control Function

Actuator (Ref. Nº)

V

V

GEMÜ Figure Number

If possible also provide

Working medium and concentration.Working pressure and temperature.Control (operating) MediumControl (operating) Pressure min. and max. availableMode and/or frequency of operation.Flow ratePercent solids Temperature cycling.Line shock conditions.Use of line cleaning fluids.Type of exposure (Weather, submersion, off shore platform, etc.).

1.2.3.4.5.6.7.8.9.10.11.




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Actuator Accessories

ProductSupplementary

Code

8062

Volante de Emergência,GEMÜ 1460

ProductSupplementary

Code

Other accessories, e.g. for connection to FIELDBUS/PROFIBUS NET, upon request.

7016 7037 7014 7015

Solenoid Valve, 3/2 way, 1/4" BSP, NC, GEMÜ 322.

- 24 DC- 24 AC- 110 AC- 220 AC Other voltages, on request

7017 7131 7198

Electrical Position Indicator with limit switches, GEMÜ 1201

-Open-Close Valve position-Open Valve position-Close Valve position

8065

Mounting bracket complying with NAMUR GEMÜ 1450/1460

8067 8296

Electro-pneumatic Positioner,GEMÜ 1420

- Single acting, 4 a 20 mA- Double acting, 4 a 20 mA

7018 7199 7200

8082 8297

8063

Pneumatic Positioner,GEMÜ 1410

- Single acting, 3 a 15 psi- Double acting, 3 a 15 psi

Optical position IndicatorGEMÜ 1300

8556 8560

Adjustable Stroke Limiter

- GEMÜ 1101 (Control function 1)- GEMÜ 1111 (Control function 2 and 3)

8066

Regulating valve and gauge GEMÜ 1650

7020 7203 7204

7019 7201 7202

8062

Emergency Handwheel, GEMÜ 1460(It’s an emergency opening device for normally closed valves or an emergency closing device for normally open valves)

E lec t r i ca l Pos i t ion Ind ica to r explosion-proof design GEMÜ 1205


Electrical Position Indicator with proximity switches DIN 19234 (NAMUR), two wire, GEMÜ 1211


Electrical Position Indicator with proximity switches PNP, 3 wire, GEMÜ 1214

-Open-Close Valve position-Open Valve position-Close Valve positionRem.: NPN, on request

other, on request

other, on request

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Dimensional Data

Note: As there is a great number of combinations of different types of connection standards and materials, the dimensional data for valve bodies (including face-to-face) are given separately on pages 12,13,14,15 and 16, under the heading "Valve Body Dimensions”

R



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DIAPHRAGM VALVE 684

Threaded 1/2" to 2" (15 to 50 mm)Body Flanged 1/2" to 2" (15 to 50 mm)Body

mm in

15 1/2"

20

25

32

50

40

3/4”

1”

1.¼”

2”

1.½”

-

126

126

-

-

-

126

-

210

-

210

210

B B

ACTUATORSize (Ref. No)

1A3, 1AF and 1AD

ACTUATORSize (Ref. No.)

2A2 ; 2A3 ; 2AF and 2AD

170 -

-

-

170

170

-

-

245

- 245

260

H H

Actuator

-

-

-

M16x1

M16x1

M16x1

M16x1

M16x1

M16x1

-

-

-

e e

Nominal SizeDN

1/4”BSP1/4”BSP

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Valve Body Dimensions


DNdKD

b1 b

L

d1

Body with thick lining (Injected) Raised Face - (smooth finish)Face-to-face ISO 5752 (short) or BS 5156

Note: In this case b1 = thickness that is also height of raised face.lining

Connection Body Material

56

56

56

56

56

56

56

56

15

16

18

92

94

97

96

98

Combinations of connections and materials covered by this configuration

1/2"

3/4"

1"

1.1/4"

1.1/2"

2"

32

40

50

15

20

25

3.5230

3.0

3.0

150

130

3.0160

3.5180

3.5200

191

-

-

127

165

165

3.0 1.5 - - 1.5 0.8 4.0 15.7 91.9 120.7 19 4

- - - - 1.5 0.8 3.0 11.2 35.1 60.5 16 4

- 1,5 - - 1.5 0.8 3.0 11.2 42.9 69.9 16 4

3.0 1.5 - - 1.5 0.8 3.0 11.2 50.8 79.2 16 4

3.0 - - - 1.5 0.8 3.0 12.7 63.5 88.9 16 4

3.0 1,5 - - 1.5 0.8 3.0 14.2 73.2 98.6 16 4

191 191 191 191192.6 152.4

- 117 117 127118.6 88.9

117 117 117 127118.6 98.4

127 127 127 127128.6 108.0

- 146 146 159147.6 117.5

159 159 159 159160.6 127.0

194

120

120

130

149

162

InmmDN b1 b1 b1 b1 b1 b1 b1 b1

b K ZL L L L L L L L

D d d1Body Material No. 17

15,16,18,92,94 96,97 and 98 34 and 37 11,44 and 47 08 50 55

13,52,54,56 57,58,59,63

Connection No. 39 56 57 58 (No. of Holes)

O n l y f o r Bodies with Flange RF

Flanged ANSI B 16.1, 125# or ANSI B 16.5, 150# - Face-to-Face BS 5156 or ISO 5752 (short and long)

DNdKD

b1 b

L

d1

Body with thick lining (Injected) Raised Face - (smooth finish)Face-to-face ISO 5752 (long)



39 17

Note: In this case b1 = lining that is also height of raised face. thickness

Note: In this case b1 = thickness lining


58

58

58

58

58

58

58

58

13

52

54

56

57

59

58

63


Body with thick lining,Flat Face (smooth finish)Face-to-face ISO 5752 (short) or BS 5156

DND K

b1 b

d1

L

Body with thin lining (coating)Flat Face, (smooth finish)Face-to-face ISO 5752 (short) or BS 5156

Connections

Note: In this case b1 = lining thickness (coating)

Body Material

58

58

50

55

Combinations of connections and materials covered bythis configuration

D

DN

b1 b

L

d1

K

Body without lining Flat Face (smooth finish)Face-to-face ISO 5752 (short) or BS 5156.


57

57

57

58

11

44

47

08

Combination of connections and materials covered bythis configuration

D

DNK

b

d1

L

Body without lining - Raised Face (smooth finish)Face-to-face ISO 5752 (short) or BS 5156


56

56

34

37


Note: In this case b1 = height of raised face.

D K d

d1

b1

bL

DN



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CERTCERT


DIAPHRAGM VALVE 684

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DNdKD

b1 b

L

d1

Body with thick lining (Injected) Raised Face - (smooth finish)Face-to-face MSS SP-88

Note: In this case b1 = height of raised face.


38

38

38

15

17

18


NOTE: I) Valves with rubber lined bodies, (body material number 82, 83, 84, 86, 87 and 98) can also be supplied with raised face (connection No. 38). Their face-to-face dimensions are the same informed on the connection No. 44 column).

Body with thin lining (coating)Flat Face, (smooth finish)Face-to-face MSS SP-88

Connections

Note: In this case b1 = lining thickness

Body Material

45

45

50

55

Combinations of connections and materials covered bythis configuration

D

DN

b1 b

L

d1

K

Body without lining Flat Face (smooth finish)Face-to-face MSS SP-88


44

44

44

45

11

44

47

08

Combination of connections and materials covered bythis configuration

D

DNK

b

d1

L

Body without lining - Raised Face (smooth finish)Face-to-face MS SP-88


38

38

38

11

47

44


Note: In this case b1= height of raised face.

D K d

d1

b1

bL

DN

Body with thick lining Flat Face - (smooth finish)Face-to-face MSS SP-88

Note: In this case b1 = lining thickness.


44

44

44

44

44

44

83

82

84

86

87

88


DNKD

b1 b

L

d1

InmmDN b1 b1 b1 b1 b1 b1 b1

b K ZL L L L L L L

D d d1Body Material No. 11, 44 and 47 15,17 and 18 11, 44, and 47

82, 83, 8486, 87, and 88

08 50 55

Connection No. 38 44 45 (No. of Holes)

O n l y f o r Bodies with Flange RF

Flanged ANSI B 16.1, 125# or ANSI B 16.5, 150# - Face-to-Face MSS SP-88

1/2"

3/4"

1"

1.1/4"

1.1/2"

2"

32

40

50

15

20

25

- 3,2 - 15.7 91.9 120.7 19 4

- - - 11.2 35.1 60.5 16 4

- 3,2 - 11.2 42.9 69.9 16 4

- 3,2 - 11.2 50.8 79.2 16 4

- 3,2 - 12.7 63.5 88.9 16 4

- 3,2 - 14.2 73.2 98.6 16 4

152.4

88.9

98.4

108.0

117.5

127.0

1,5 0,8

- -

1,5 0,8

1,5 0,8

1,5 0,8

1,5 0,8

192,6

-

141,6

141,6

153,6

166,6

194

-

143

143

155

168

1,6191

1,6

-

140

-

1,6140

1,6152

1,6165

191 197 191

140 146 140

- - -

140 146 140

152 171.5* 152

165 171.5 165

200

-

146

146

175*

175

1,6

-

1,6

1,6

1,6

1,6

RDIAPHRAGM VALVE 684




CERTCERT


½"

¾"

1"

1.¼"

1.½"

2"

32

40

50

15

20

25

- - -1,5 0,8 4,0 17 19114 11417 4

- - -1,5 0,8 3,0 13 1367 6714

- - -1,5 0,8 3,0 13 1373 7314 4

- - -1,5 0,8 3,0 13 1383 8314 4

- - -1,5 0,8 3,0 16 1687 8714 4

- - -1,5 0,8 3,0 16 1698 9814 4

191 191192,6 152 152

117 127118,6 95 95

117 127118,6 102 102

127 127128,6 114 114

146 159147,6 121 121

159 159160,6 133 133

194

120

120

130

149

162

InmmDN b1 b1 b1 b1 K K

L L L LD D

17

14

14

14

14

14

d1Tab. D

d1Tab. E

bTab. D

bTab. E

Body material No. 08 50 55 13,52,54,56 57,58,59,63

Connection No. 50 - 51

4

ZTab. D

ZTab. E

No. ofholes

No. ofholes

4

4

4

4

4

4

Flanged BS 10 Tab. “D” e “E” - Face-to-face BS 5156 or ISO 5752 (short)

d d

Flange BS 10 Tab. D Flange BS 10 Tab. E

Body without liningFlat Face (smooth finish)Face-to-face ISO 5752 (short) or BS 5156.


50

51

08

08

D

DNK

b

d1

L


Body with thin lining (coating)Flat Face (smooth finish)Face-to-face ISO 5752 (short) or BS 5156.

Obs.: In this case b1= thickness (coating)lining

50

50

51

51

50

55

50

55

D

DN

b1 b

L

d1

K


Connection Body MaterialConnection Body Material

Body Material50 / 51

50 / 51

50 / 51

50 / 51

50 / 51

50 / 51

50 / 51

50 / 51

13

52

54

56

57

59

58

63

DND K

b1 b

d1

L


Body with thick liningFlat Face (smooth finish)Face-to-face ISO 5752 (short) or BS 5156.

Obs.: In this case b1= thickness lining

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Note: In this case b1 =lining that is also heigth of raised face.

thickness


04

04

04

04

04

04

04

04

13

52

54

56

57

59

58

63

Combinations of connections and materials covered b y t h i s configuration

DD

d1d1

b1b1 bb

LL

DN

DNKK dd

Body with thick liningRaised Face (smooth finish)Face-to-face ISO 5702 (long) or DIN 3202

Body without lining Flat Face, (smooth finish)Face-to-face ISO 5752 (short) or BS 5156.


52 08


D

DNK

b

d1

L

Body with thin lining (coating) Flat Face, (smooth finish)Face-to-face ISO 5752 (short) or BS 5156

Connection

Note: In this case b1 = lining thickness (coating)

Body Material

52

52

50

55Combinations of connections and materials covered by this configuration

D

DN

b1 b

L

d1

K

Note: In this case b1 = lining thickness


52

52

52

52

52

52

52

52

13

52

54

56

57

59

58

63


Body with thick liningFlat Face, (smooth finish)Face-to-face ISO 5752 (short) or BS 5156

DND K

b1 b

d1

L



04

04

50

55

Note: In this case b1 is the sum between lining thickiness and original height of raised face.

Body with thinlining (coating)Raised Face (smooth finish)Face-to-face ISO 5752 (long) or DIN 3202


Note: In this case b1 = thickness that is also height of raised face.

lining



04

04

17

18

DNdKD

b1 b

L

d1

Body with thick lining (Injected) Raised face (smooth finish)Face-to-face ISO 5752 (long) or DIN 3202

Body without lining Raised Face (smooth finish)Face-to-face ISO 5752 (long) or DIN 3202


04 08Combinations of connections and materials covered b y t h i s configuration

Note: In this case b1= height of raised face.




CERTCERT


0.8 4.0 20 102 125 18 4

0.8 3.0 14 45 65 14 4

0.8 3.0 16 58 75 14 4

0.8 3.0 16 68 85 14 4

0.8 3.0 18 78 100 18 4

0.8 3.0 18 88 110 18 4

191192.6 165

127118.6 95

127118.6 105

127128.6 115

159147.6 140

159160.6 150

b1 b1b K Z

L LD d d1

5513,52,54,56,

57,58, 59 and 63

52 (No. of Holes)

Only for Bodies with Flanges RF

Flanged DIN 2532 PN10 or BS 4504 PN 10

1/2"

3/4"

1"

1.1/4"

1.1/2"

2"

32

40

50

15

20

25

3.0 4.0230 230 233 231.6

2.0 -130 - 133 131.6

2.0 3.0150 150 153 151.6

2.0 3.0160 160 163 161.6

2.0 3.0180 180 183 181.6

3.0 3.0200 200 203 201.6

3.0 4.5 3.8

2.5 3.5 2.8

2.5 3.5 2.8

3.0 3.5 2.8

3.0 3.5 2.8

3.0 4.5 3.8

InmmDN b1 b1 b1 b1 b1L L L L L

08 17 and 18 50 55

04

230

130

150

160

180

200

- 1.5

- 1.5

- 1.5

- 1.5

- 1.5

- 1.5

191

117

117

127

146

159

b1 b1L L

08 50

194

120

120

130

149

162

Body Material No.

Connection No.

13,52,54,56,57,58,59 and 63

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DIAPHRAGM VALVE 684


Dimensional Data for Diaphragms

1/2"

3/4"

1"

1.1/4"

1.1/2"

2"

32

40

50

15

20

25

82 78 124 82 13 7 8 1/4" 4

54 46 72 54 9 6 8 1/4" 4

54 46 72 54 9 6 8 1/4" 4

54 46 72 54 9 6 8 1/4" 4

70 65 100 70 11 7 8 1/4" 4

70 65 100 70 11 7 8 1/4" 4

Inmm

A B C D d e h W Z(No. of Holes)

Nominal Size(DN)

Note: The thread (W) of diaphragm stud is according to Whitworth standard.

1/2" 1/2"-14 1/2"-14

3/4" 3/4"-14 3/4"-14

1" 1"-11 1"-11.1/2

1.1/4" 1.1/4"-11 1.1/4"-11.1/2

1.1/2" 1.1/2"-11 1.1/2"-11.1/2

2" 2"-11 2"-11.1/2

32

40

50

15

20

25

165 165

85 85

85 85

110 110

120 120

140 140

InmmNominal Size (DN) D DL L

Body Material 08 (cast iron GG25)37 (stainless steel 316)

08 (cast iron GG25)

Connection 01 (BSP thread) 31 (NPT thread)

21.72

27.05

33.78

42.55

48.64

61.11165 18

85 09

85 10

110 13

120 15

140 18

DL

C37 (Stainless

70 (Socket weld)

Threaded and Socket Weld

DN 15 to 50

C

Ød

A

DB

(Z holes)

Stud

Fabric reinforcement

Sealing bead

Bolt holes

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List of Replacement Parts and Components

1 Body 012 Diaphragm 013 Compressor 014 Distance Piece 018 Hex Head Machine Bolt 04

10 Upper Actuator Cover 01 11 Lock Nut 01

14 Lower Bushing 01 17 Spring 3 01

18 Spring 2 0120 Diaphragm Plate 0221 Control Diaphragm 0122 Elastomeric Washer 0223 Hex Head Bolt 0624 Upper Plug 0125 Lower Actuator Cover 0126 Packing 0127 Hex Nut 0428 Spring Washer 0431 Hex Head Machine Bolt 0432 Washer 0134 Spring 1 0150 Valve Stem 0152 Spring Washer 06

95 Complete Actuator 01

This section drawing shows valve configuration:

Valve diameter From 15 mm (1/2") to 25 mm (1")

Actuator Size Ref. No.: 1A3

Control Function Normally closed (by springs) - Ref. No.: 1

.

As you order replacement parts, you always must advise the GEMÜ figure number of the valve for which these parts are intended (See on page 10 in the section “order example” how to obtain the complete figure number of a specific GEMÜ 684 diaphragm valve).Practical examples: 1)Diaphragm (pos. 2) GEMÜ type V0684015D01081411A3

2) Body (pos.1) GEMÜ type V0684025D31080811A3

3) Complete actuator (pos.95) GEMÜ type V0684020D58081411A3

R

Pos. Piece Name Quantity (Units)



CERTCERT


DIAPHRAGM VALVE 684

34

10

22

52

23

25

8

27

28

2

31

1

24

18

17

11

32

20

21

26

14

50

4

3

Note:I) The valve does not require maintenance. The diaphragm

is the only serviceable item.

II) Valves with bodies that have "injected type" lining, that is, with PVDF (code 15), PFA-Teflon (code 17), or with Polypropylene (code 18) the item pos. 31 changes from hex head machine bolt to socket head bolt.

Complete actuator consists of all the parts of the valve except Body, Diaphragm and Body bolting.

Connection for control medium 1/4” BSP

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Valve diameter

Actuator Size Ref. No.: 2A2 ; 2A3

From 32 mm (1.¼") to 50 mm (2”)

Control Function Normally closed (by springs) - Ref. No.: 1

.

As you order replacement parts, you always must advise the GEMÜ figure number of the valve for which these parts are intended (See on page 10 in the section “order example” how to obtain the complete figure number of a specific GEMÜ 684 diaphragm valve).Practical examples: 1)Diaphragm (pos. 2) GEMÜ type V0684032D01081412A2

2) Body (pos.1) GEMÜ type V0684040D31080812A2

3) Complete actuator (pos.95) GEMÜ type V0684050D58081412A3

R




CERTCERT


DIAPHRAGM VALVE 684

34

10

39

22

52

23

25

8

27

28

75

2

31

1

24

18

17

11

32

20

21

40

26

14

50

76

4

3



14 Lower Bushing 01 17 Spring 3 01

18 Spring 2 0120 Diaphragm Plate 0221 Control Diaphragm 0122 Slatomeric Washer 0223 Hex Head Bolt 0624 Upper Plug 0125 Lower Actuator Cover 0126 Packing 0127 Hex Nut 0428 Spring Washer 0431 Hex Head Machine Bolt 0432 Washer 0134 Spring 1 0139 Stop Piece 0140 “O”Ring 0150 Valve Stem 0152 Spring Washer 0675 Compressor pin 0176 Stem Coupling 01







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As you order replacement parts, you always must advise the GEMÜ figure number of the valve for which these parts are intended (See on page 10 in the section “order example” how to obtain the complete figure number of a specific GEMÜ 684 diaphragm valve).Practical examples: 1)Diaphragm (pos. 2) GEMÜ type V0684025D58130521AF

2) Body (pos.1) GEMÜ type V0684020D58081421AF

3) Complete actuator (pos.95) GEMÜ type V0684015D01080521AF

R




CERTCERT


DIAPHRAGM VALVE 684

Valve diameter

Actuator Size Ref. No.: 1AF.

From 15 mm (1/2") to 25 mm (1”)

Control Function Normally open (by springs) - Ref. No.: 2

10

22

35

52

23

25

8

27

28

2

31

1

24

43

11

32

20

21

19

14

50

4

3



14 Lower Bushing 01 19 Plastic Plug 01

20 Diaphragm Plate 0221 Control Diaphragm 0122 Elastomeric Washer 0223 Hex Head Machine Bolt 0624 Upper Plug 0125 Lower Actuator Cover 0126 Packing 0127 Hex Nut 0428 Spring Washer 0431 Hex Head Bolt 0432 Washer 0135 Spring AF 0143 “O”Ring 0150 Valve Stem 0152 Spring Washer 06


26



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As you order replacement parts, you always must advise the GEMÜ figure number of the valve for which these parts are intended (See on page 10 in the section “order example” how to obtain the complete figure number of a specific GEMÜ 684 diaphragm valve).Practical examples: 1)Diaphragm (pos. 2) GEMÜ type V0684032D01080522AF

2) Body (pos.1) GEMÜ type V0684040D58081422AF

3) Complete actuator (pos.95) GEMÜ type V0684050D58500522AF

R




CERTCERT


DIAPHRAGM VALVE 684

Valve diameter

Actuator Size Ref. No.: 2AF.

From 32 mm (1.¼") to 50 mm (2”)

Control Function Normally open (by springs) - Ref. No.: 2

24

10

39

22

40

52

23

25

8

75

27

28

31

1

43

11

32

20

21

35

19

26

14

50

76

3

4

2



14 Lower Bushing 01 19 Plastic Plug 01 20 Diaphragm Plate 0221 Control Diaphragm 0122 Elastomeric Washer 0223 Hex Head Bolt 0624 Upper Plug 0125 Lower Actuator Cover 0126 Packing 0127 Hex Nut 0428 Spring Washer 0431 Hex Head Machine Bolt 0432 Washer 0135 Spring AF1 0139 Stop Piece 0140 “O”Ring 0143 “O”Ring 0150 Valve Stem 0152 Spring Washer 0675 Compressor pin 0176 Stem Coupling 01




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As you order replacement parts, you always must adeise the GEMÜ figure number of the valve for which these parts are intended. (Practical examples: 1)Diaphragm (pos. 2) GEMÜ type V0684015D01080831AD

2) Valve body (pos.1) GEMÜ type V0684020D58500531AD

3) Complete actuator (pos.95) GEMÜ type V0684025D58131431AD

See on page 10 in the section “order example” how to obtain the complete figure number of a specific GEMÜ 684 diaphragm valve).



Note:I) The valve does not require maintenance, the diaphragm is

the only serviceable item.


R




CERTCERT


DIAPHRAGM VALVE 684

Valve diameter From 15 mm (1/2") to 25 mm (1”)

Actuator Size Ref. No.: 1AD

Control Function Double acting - Ref. No.: 3

.

10

22

52

23

25

8

27

28

2

31

1

24

43

11

32

20

21

26

14

50

4

3



14 Lower Bushing 01 20 Diaphragm Plate 02

21 Control Diaphragm 0122 Elastomeric Washer 0223 Hex Head Bolt 0624 Upper Plug 0125 Lower Actuator Cover 0126 Packing (Quading) 0127 Hex Nut 0428 Spring Washer 0431 Hex Head Machine Bolt 0432 Washer 0143 “O”Ring 0150 Valve Stem 0152 Spring Washer 06




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As you order replacement parts, you always must adeise the GEMÜ figure number of the valve for which these parts are intended. (Practical examples: 1)Diaphragm (pos. 2) GEMÜ type V0684032D31080832AD

2) Valve body (pos.1) GEMÜ type V0684040D58500532AD

3) Complete actuator (pos.95) GEMÜ type V0684050D58131432AD

See on page 10 in the section “order example” how to obtain the complete figure number of a specific GEMÜ 684 diaphragm valve).



Note:I) The valve does not require maintenance, the diaphragm is

the only serviceable item.

II) Valves with bodies that have "injected type" lining, that is, with PVDF (code 15), PFA-Teflon (code 17), or with Polypropylene (code 18) the item pos. 31 changes from hex head machine bolt to socket head bolt

R




CERTCERT


DIAPHRAGM VALVE 684

Valve diameter From 32 mm (1.¼") to 50 mm (2”)

Actuator Size Ref. No.: 2AD

Control Function Double acting - Ref. No.: 3.

.

24

10

39

22

40

52

23

25

8

75

27

28

31

1

43

11

32

20

21

26

14

50

76

3

4

2



14 Lower Bushing 01 20 Diaphragm Plate 0221 Control Diaphragm 0122 Elastomeric Washer 0223 Hex Head Bolt 0624 Upper Plug 0125 Lower Actuator Cover 0126 Packing 0127 Hex Nut 0428 Spring Washer 0431 Hex Head Machine Bolt 0432 Washer 0139 Stop Piece 0140 “O”Ring 0143 “O”Ring 0150 Valve Stem 0152 Spring Washer 0675 Compressor pin 0176 Stem Coupling 01




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Installation, Operation and Maintenance Instructions

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DIAPHRAGM VALVE 684

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I) Installation

You can install GEMU 620 diaphragm valve on the pipeline in any position: horizontal, upright or inclined. The direction of the flow does not matter. Follow the recommendations below before you install the valve:

1°) Confirm that the valve is suitable for the process fluid, concentration, flow rate, pressure and temperature.

2°) Ensure enough space is provided for connecting the air supply tubing and for mounting additional accessories.

3°) Ensure there is room to enable future replacement of the diaphragm or removal of the actuator.

4°) Existing Systems:Make sure that this pipeline is blocked (bubbletight) with valves on both ends, before servicing begins. Be aware of the toxicity, corrosive effects and dangers regarding the fluid flowing through the pipeline and use suitable protection equipment. The best way would be to drain the pipeline completely before you install or service the valve.

5°) Valve installation in the pipeline is very simple. Ensure the valve connection is to the correct standard rating class, material and diameter. Maximum working pressure according to the nominal size, actuator type and diaphragm material are specified on this catalog. For flanged connections use a gasket that would be suitable for the kind of service and flange type. Tighten the bolts between the flange of the valve and mating flange on the pipeline. Follow the diametrically opposite order of tightening bolts and apply suitable and uniform torque. ATTENTION: For valve bodies with glass lining use soft gaskets, e. g. rubber gaskets compatible with the fluid flowing through the pipeline, or PTFE (Teflon) gaskets with soft core (envelope)

6°) Connect the air supply tubing to the connection for control medium on the valve actuator. Refer to the tables and diagrams on pages 06, 07, 08 and 09/32 to obtain the right control medium pressure. For mounting positioners see GEMÜ control valves catalog.

IMPORTANT NOTE: As the diaphragm always consists of a compressible elastomer, which is subject to deformation, we recommend that after storage and putting the valve in the line, that the body/bonnet bolts are checked for tightness and retightened if necessary.


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DIAPHRAGM VALVE 684S

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II) Operation

The GEMÜ 620 diaphragm valve was designed for simple on-off operation (except when equipped with a positioner) providing reliable and accurate automatic process control.

The following ways of on-off control can be accomplished:

1°) Valve with control function (Ref. No. 1): Normally closed by springs - Air to open

- This actuator is designed to operate from a normally closed position. The valve is opened when a 3-way solenoid valve admits supply air (control medium) into the lower chamber of the actuator and the air pressure will hold the valve in the open position. The springs will close the valve when the air is released.

2°) Valve with control function (Ref. No. 2): Normally open by springs - Air to close.

- This actuator is designed to operate from a normally open position. The valve is closed when a 3-way solenoid valve admits supply air ( control medium) into the upper chamber of the actuator and the air pressure will hold the valve in the closed position. The spring (s) will open the valve when the air is released.

3°) Valve with control function ( Ref. No. 3 ): Double acting - Air open and air to close.

The valve is opened when a 5-way solenoid valve admits supply air into the lower chamber of the actuator and simultaneously releases the air from the upper chamber. In a contrary mode, to close the valve, the same solenoid valve admits the air into the upper chamber while removing air from the lower chamber.

NOTE: For automatic throttling control a valve positioner is required. Refer to GEMÜ control valves catalog and to the positioner manual for operation instructions.

III) Maintenance

In principle, the GEMÜ 620 diaphragm valve does not require maintenance. If you have specified material for the valve body or lining and diaphragm that would be suitable for the application in question, you may expect a long life for the whole assembly. What may eventually happen is the shortening of the diaphragm life (wearing part) from excessive (undue) tightening when closing the valve (it means the valve actuator was not properly sized), fatigue because of a great number of operations, or else in very demanding applications such as handling abrasive fluids.Thus you might say that the only maintenance this valve requires is the replacement of diaphragm. One other kind of intervention that may be required is servicing.

Note 1)Safety: As the maintenance works on this product could require the use of mechanical tools and devices, we recommend that a skilled professional who has been trained for this task carries out the whole operation described below.

Note 2)Warranty: The valve should be sent to the GEMÜ factory for the "Diaphragm Replacement " and/or "Repair" services for the duration of warranty period or the warranty is void . If you have any questions, please contact the GEMÜ customer service department for further details.

IV) Procedure for replacing the diaphragm

Before you start to replace the diaphragm itself, make sure that the pipeline on which the valve is installed is completely drained or blocked (airtight) with valves on both sides. Be aware of the toxicity, corrosive effects and dangers regarding the fluid flowing through the pipeline and use the suitable protection equipment (for example: gloves, overalls, face masks, etc.). The best way would be to drain the line completely before you start the operation. You do not have to remove the valve body from the pipeline to replace the diaphragm.

1°) Removal of the actuator:

- If it is a Normally closed valve (control function 1= C.F.1), the valve must first be opened applying compressed a i r to the lower chamber of the actuator.

- For the other valve control function i.e. Normally open (control function 2 = C.F.2) or double acting ( control function 3 = C.F.3) it is not needed any operation on the actuator.

- Pull out hex nuts (pos. 27), washers (pos. 28) and bolts (pos. 31), except stud bolts (valves with DN ³ 100 mm), in this case, to leave the stud bolts in the valve body. Inspect the general condition of thes fastening elements and replace them by other original ones if required.

2°) Remove the actuator (pos. 95) by pulling it out from the valve body.

In order to make easier the following steps, put the actuator upside down on a workbench.


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3°) To detach the diaphragm (pos. 2) from the actuator (pos. 95):

- For (C.F.1); release partially the air from the lower chamber, rotate the diaphragm (pos.2) anticlokwise to unscrew it from the compressor (pos.3).

- For (C.F.2) and (C.F.3); operate the actuator by supplying air to the upper chamber nearly half stroke and then rotate the diaphragm (pos.2) anticlockwise to unscrew it from the compressor (pos.3).4°) Ta k e t h e n e w

diaphragm (pos. 2), check that it meets the specifications for the application and its dimensions are id en ti ca l to th e previous one.

5°) To place the new diaphragm (pos.2) on to the actuator (pos. 95) .

- For (C.F.1); screw the new diaphragm (pos. 2) on by its stud (without forcing) onto the thread inside the compressor (pos. 3) until both of them meet. Then, rotate the diaphragm anticlockwise just sufficiently

to align the holes in the distance piece (pos. 4) with the holes in the diaphragm (pos. 2), so that all holes coincide perfectly. Operate the actuator to its fully open position until the diaphragm (pos.2) fully contacts the bottom of the distance piece (pos. 4).

-For (C.F.2) and (C.F.3): screw the new diaphragm (pos.2) on by its stud (whithout forcing)onto the thread inside the compressor (pos. 3) until both of them meet.Then, rotate the diaphragm anticlockwise just sufficiently to align the holes in the distance piece (pos.4) with the holes in the diaphragm (pos. 2), so that all holes coincide perfectly. Operate the actuator by releasing all the air from its upper chamber until the diaphram (pos.2) fully contests the bottom of the distance piece (pos.4) . For actuators (C.F.3) a little help with the hands is needed to put

the diaphragm on that position.

6°) Place the complete actuator with its diaphragm onto the valve body. Align the holes, so that they coincide and the diaphragm weir sealing bead is aligned with the seat of the valve. Replace the mounting bolts (pos. 35) (only f o r valves with DN up to 80 mm). Replace the hex nuts (pos.27) and the corresponding spring washers (pos. 28). Tighten the nuts in diametrically opposite order. The required torque is the combined result of such factors as

material of diaphragm and bolt cross section (ø). Apply sufficient torque to accomplish the perfect seal.

9°) Test the airtightness of the valve and quality of its operation before you reinitiate operation of the line.

10°) Reactivate the normal operation of the line.

Attention: For PTFE (Teflon) diaphragms with diameters 10" (250 mm) and 12" (300 mm), the procedure for replacing diaphragm is similar to the procedure described above. The only difference is that PTFE (Teflon) plate in contact with the fluid is the part you have to detach from the rubber diaphragm (that works just as a backing cushion). Therefore you have to use this assembly as a single element. It works perfectly by creating vacuum in between. Due to this characteristic, PTFE diaphragms of these diameters do not apply where there is vacuum (negative pressure in the line).



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e-mail: [email protected]


GEMÜ Indústria de Produtos Plásticos e Metalúrgicos Ltda. CGC 77152338/0001-93 Insc. Est. 10504544-16Fábrica: Rua Marechal Hermes, 1745 - CEP 83065000 - SÃO JOSÉ DOS PINHAIS - PR Tel: (041) 3382-2425 Fax: (041) 3382-3531

Documents

CAT-684 1 28 - edelflex.com · b j e c t t o a l t e r a t i o n VALVES, ACTUATORS AND CONTROL SYSTEMS R DIN EN ISO 9001 CERT Zertifikat: 5027 Diaphragm Valve 2/2-Way - Pneumatically