CAT-684 1 28

Diaphragm Valve

R 684

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 becontrolled by anyinert liquid orgas. The GEM?684 diaphragm valvefeatures 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 liquidor gaseous fluids, w ith or withoutsolids in suspension.

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R VALVES, ACTUATORS AND CONTROL SYSTEMS

CERT

DIN EN ISO 9001 Zertifikat: 5027

Diaphragm Valve

R 684

2/2-Way - Pneumatically Operated

Construction

The valve is compact and strong with a single body, a metal pneumatic actuator and a resilient rubber diaphragm. When the GEM? 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 GEM? 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.

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.

R VALVES, ACTUATORS AND CONTROL SYSTEMS

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DIN EN ISO 9001 Zertifikat: 5027

CAT-V0684 Rev. 00 Page 02/28

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DIAPHRAGM VALVE

Construction Details and Advantages

R 684

Metal thread for accessory attachment.

Spring (or set of springs).

Connection for control medium.

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.)

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).

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

Lining of the body of different materials such as Thermoplastics (PP, PVDF, PFA), or of Natural/Synthetic Rubber, or yet Glass or ECTFE (Halar).

R VALVES, ACTUATORS AND CONTROL SYSTEMS

GEM? standard nitrocellulose lacquer or epoxy paints (other special paint on request).

CERT

DIN EN ISO 9001 Zertifikat: 5027

DIAPHRAGM VALVE

Technical Data for Ordering

R 684

GENERAL DATA

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

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

Maximum workingPressure:

10 bar

May 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: 80?C

Maximum permissible pressure of control medium:

7 bar

Note:I)Refer to the document "GEM? general technical data on metal diaphragm valves" and the "GEM? 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 GEM? sales office)

SPECIFICATION AND CODING

Note:In case of any doubt see the document "GEM? BR Product figure number code system"

Product Category

Valve

Ref. No. V

Product Type

Ref. No.

GEM? 684 Pneumatically Operated weir type Metal Diaphragm Valve

0684

Nominal Size* (DN)

(mm)

15 20 25 32 40 50

(In.)

1/2" 3/4" 1" 1.1/4" 1.1/2" 2"

Kv (m?/h)** 7.0 14 20 36 40 80

Ref. No.

015 020 025 032 040 050

* 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 Ref. No. from 1 to 15).

Body Configuration

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

Ref. No. D

Valve Connection

Threaded socket DIN ISO 228 (BSP)

Flanged DIN 2532 PN 10, RF, Cform, Face-to-face DIN 3202 (F1series )

Ref. No. 01 04

Threaded socket NPT

31

Flanged ANSI B16.5, class 150, RF (smooth finish).

Face-to-face MSS SP-88

38

Flanged ANSI B16.5, class 150, RF (smooth finish).

Face-to-face ISO 5752 (long)

39

Flanged ANSI B16.5, class 150, FF (smooth finish).

Face-to-face MSS SP-88

44

Flanged ANSI B16.1, class 125, FF (smooth finish).

Face-to-face MSS SP-88

45

Flanged BS 10 Tab "D", FF (smooth finish).

Face-to-face ISO 5752 (short) or BS 5156

50

Flanged BS 10 Tab. "E", FF (smooth finish).

Face-to-face ISO 5752 (short) or BS 5156

51

Flanged DIN 2532 PN 10, FF, A form (smooth finish)

Face-to-face ISO 5752 (short) or BS 5156

52

Flanged DIN 2532 PN 10, RF, C form

Face-to-face ISO 5752 (short) or BS 5156

54

Flanged ANSI B16.5, class 150, RF (smooth finish).

Face-to-face ISO 5752 (short) or BS 5156

56

Flanged ANSI B16.5, class 150, FF (smooth finish).

Face-to-face ISO 5752 (short) or BS 5156

57

Flanged ANSI B16.1, class 125, FF (smooth finish).

Face-to-face ISO 5752 (short) or BS 5156

58

Flanged BS 10 Tab "F", FF (smooth finish).

Face-to-face ISO 5752 (short) or BS 5156

64

Socket weld ANSI B16.11 (SW)

70

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

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DIN EN ISO 9001 Zertifikat: 5027

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DIAPHRAGM VALVE

Technical Data for Ordering

R 684

Body/Lining Material

Cast iron DIN 1691 GG 25

Ref. No.

01 08

Cast carbon steel ASTM A 216 Grade WCB

11

Cast iron DIN 1691 GG 25 with hard rubber

lining (Ebonite).

13

Ductile iron DIN 1693 GGG 50 with PVDF lining

(At least 3.0 mm thick).

15

Ductile iron DIN 1693 GGG 50 with hard rubber

lining (Ebonite).

16

Ductile iron DIN 1693 GGG 40.3 with

?

17

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

Ductile iron DIN 1693 GGG 50 with

Polypropylene lining (at least 3.0 mm thick)

18

316L Stainless steel investment cast 34

ASTM A 351 CF3M (Fe ................
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