CAT-684 1 28

R

Diaphragm Valve

684

2/2-Way - Pneumatically Operated

Introduction

Subject to alteration

CAT-V0684 Rev. 00 Page 01/28

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 GEM? 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.

R

VALVES, ACTUATORS

AND CONTROL SYSTEMS

CERT

DIN EN ISO 9001

Zertifikat: 5027

R

Diaphragm Valve

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

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Bubbletight shutoff. The diaphragm will accommodate itself to grit, rust, slurry or

fibrous particles present in the line.

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

positioner.

Lower initial price. No special alloy working parts are required.

Long trouble-free operation and lower operating cost. High operating efficiency on

account of low pressure drop and streamline flow.

Long life rugged maintenance-free actuators.

No stuffing box to repack or packing gland to adjust.

Lower maintenance cost/easy in line maintenance. The diaphragm is replaced quickly

and easily without the need to remove the body from the pipeline.

Possibility of replacement of other diaphragm valves (other manufacturer) already

installed, as there is a wide range of standards and types of connections.

The valve can be installed in any position in the pipeline and used in both directions of

flow (bidirectional).

Wide interchangeability of bonnet assemblies and diaphragms.

Out and out durability and efficiency.

CAT-V0684 Rev. 00 Page 02/28

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Applications

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VALVES, ACTUATORS

AND CONTROL SYSTEMS

Subject to alteration

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.

CERT

DIN EN ISO 9001

Zertifikat: 5027

DIAPHRAGM VALVE

R

684

Construction Details and Advantages

Metal thread for accessory

attachment.

Actuator Cover

(It¡¯s rugged and provides

maximum strength).

Diaphragm plate.

Spring (or set of springs).

Control Diaphragm

(tough and long lasting)

Connection for control medium.

Metal distance piece.

bushing (provides smooth

operation).

Compressor

Polished Stem (Spindle) of

stainless steel

(provides smooth operation

and durability).

Bichromatized carbon steel

fasteners (stainless steel on

Subject to alteration

CAT-V0684 Rev. 00 Page 03/28

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).

Lining of the body of different

materials such as

Thermoplastics (PP, PVDF,

PFA), or of Natural/Synthetic

Rubber, or yet Glass or

ECTFE (Halar).

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VALVES, ACTUATORS

AND CONTROL SYSTEMS

G E M ? s t a n d a r d

nitrocellulose lacquer or

epoxy paints (other special

paint on request).

CERT

DIN EN ISO 9001

Zertifikat: 5027

DIAPHRAGM VALVE

R

684

Technical Data for Ordering

GENERAL DATA

Body Configuration

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

Ref. No.

D

Working Medium: According to body material, lining and sealing

(diaphragm), any neutral or corrosive liquid or gaseous fluid.

Valve Connection

Maximum permissible temperature of working medium: 150?C

(Maximum limit may vary according to the diaphragm and lining

material)

Maximum working Pressure:

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

Flanged DIN 2532 PN 10, RF, C form,

Face-to-face DIN 3202 (F1series )

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

Ref. No.

GEM? 684 Pneumatically Operated weir type Metal

Diaphragm Valve

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

Nominal Size* (DN)

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

0684

Ref. No.

Kv (m?/h)**

15

1/2"

7.0

20

3/4"

14

25

1"

20

32

1.1/4"

36

40

1.1/2"

40

2"

80

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).

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

R

VALVES, ACTUATORS

AND CONTROL SYSTEMS

CERT

DIN EN ISO 9001

Zertifikat: 5027

CAT-V0684 Rev. 00 Page 04/28

Product Type

50

01

Subject to alteration

V

(In.)

Threaded socket DIN ISO 228 (BSP)

Ref. No.

Valve

(mm)

Ref. No.

DIAPHRAGM VALVE

R

684

Technical Data for Ordering

Body/Lining Material

94

Ductile iron DIN 1693 GGG 50 with Hypalon lining

96

Ductile iron DIN 1693 GGG 50 with Neoprene lining

97

Ductile iron DIN 1693 GGG 50 with Butyl lining

98

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

?

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

17

CSM Hypalon (Chlorine Sulphonyl Polyethylene Rubber)

01

Ductile iron DIN 1693 GGG 50 with

Polypropylene lining (at least 3.0 mm thick)

18

NBR Perbunan (Nitrile Butadiene Rubber)

02

316L Stainless steel investment cast

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