Full Bore Diaphragm

Valve, Metal

Construction
The GEMÜ 655 manually operated 2/2 way full bore diaphragm valve has a
metal bonnet and a non-rising handwheel.

Features
• Optional rubber lining suitable for applications involving particulate
media, e.g.:
- Mining
- Paper and woodpulp industry
- Water treatment
- Ceramics industry
- Chemical and dyestuff industry
• Valve body and diaphragm available in various materials and designs

Advantages
• High mechanical stability
• High flow rate due to straight through flow
• Optional flow direction, will seal in either flow direction up to full
operating pressure
• Optional mounting position
• Valve can be cleaned without disassembly of bonnet
• Can be retrofitted with a pneumatic actuator (GEMÜ 9656)

Bonnet dimensions  [mm]

DN NPS øB A C
25 - 40 1” - 1 1/2” 118 148 130
50 - 65 2” - 2 1/2” 188 206 178
80 - 100 3” - 4” 238 269 229
125 - 150 5” - 6” 316 407 307
200 8” 416 415 359
250 10” 416 538 484
300 12” 700 687 562

øB
C

655
 Technical data

Working medium Ambient conditions

Corrosive, inert, gaseous and liquid media which have no Max. ambient temperature max. 60 °C
negative impact on the physical and chemical properties of
the body and diaphragm material.
Max. perm. temperature of working medium 100 °C*

Nominal size NPS Operating pressure Kv-value Weight

[DN] [bar] [m³/h] [kg]
25 1” 0 - 7.0 35 4
40 1 1/2” 0 - 7.0 38 5
50 2” 0 - 7.0 108 15
65 2 1/2” 0 - 7.0 114 16
80 3” 0 - 7.0 284 25
100 4” 0 - 7.0 298 36
125 5” 0 - 5.5 650 73
150 6” 0 - 5.5 680 76
200 8” 0 - 3.5 1790 127
250 10” 0 - 3.5 2920 214
300 12” 0 - 3.0 5180 408
All pressures are gauge pressures. Operating pressure values were determined with static operating pressure applied on one side of a closed
valve. Sealing at the valve seat and atmospheric sealing is ensured for the given values. Information on operating pressures applied on both
sides and for high purity media on request. Kv values determined acc. to IEC 534 standard, inlet pressure 6 bar, Δp 1 bar, valve body
material cast iron EN-GJL-250 and flanges EN 1092 length EN 558 series 7 and soft elastomer diaphragm.

Order data

Body configuration Code Valve body material Code

2/2-way D EN-GJL-250 (GG 25 cast iron) 8
EN-GJL-250 (GG 25 cast iron), hard rubber lined 13

Connection Code EN-GJL-250 (GG 25 cast iron), soft rubber lined 52

Flanges EN 1092 / PN10 / form A,

length EN 558, series 7, Diaphragm material Code
ISO 5752, basic series 7 52
NBR 2
Flanges EN 1092 / PN16 / form A,
length EN 558, series 7, IIR 6
ISO 5752, basic series 7 53 CR 8
Flanges ANSI class 125 FF, NR 15
length EN 558, series 7, EPDM, Ethylene Propylene Diene Monomer 24
ISO 5752, basic series 7 58
For overview of available valve bodies for GEMÜ 655 see page 3
Control function Code
Manually operated 0

Order example 655 50 D 53 8 24 0

Type 655
Nominal size 50
Body configuration (code) D
Connection (code) 53
Valve body material (code) 8
Diaphragm material (code) 24
Control function (code) 0
Other connections, valve body materials, linings and diaphragm materials on request.

655 2
 Body dimensions  [mm]

Flanges, connection code 52, 53, 58

Connection code 52, 53 Connection code 58

Number
of bolt
DN NPS FTF FTF
Body material ØD Øk ØL H1 Body material ØD Øk ØL H1
Code 8 Code 13, 52 Code 8 Code 13, 52
25 1” 4 127 127 115 85 14 19.0 127 127 108.0 79.2 16.0 21.0
40 1 1/2” 4 159 159 150 110 18 28.0 159 159 127.0 98.6 16.0 30.0
50 2” 4 191 191 165 125 18 35.0 191 191 152.4 120.7 19.0 37.0
65 2 1/2” 4 216 216 185 145 18 27.5 216 216 177.8 139.7 19.0 29.5
80 3” 8 254 254 200 160 18 33.0 254 254 190.5 152.4 19.0 35.0
100 4” 8 305 305 220 180 18 43.0 305 305 228.6 190.5 19.0 45.0
125 5” 8 356 366 250 210 18 65.0 356 366 254.0 215.9 22.0 65.0
150 6” 8 406 416 285 240 22 58.0 406 416 279.0 241.3 22.0 60.0
200 8” 8 521 531 340 295 22 88.0 521 531 342.9 298.5 22.0 90.0
250 10” 12 635 647 395 350 22 120.5 635 647 406.4 362.0 25.4 122.5
300 12” 12 749 761 445 400 22 142.5 749 761 482.6 431.8 25.4 144.5

L
H1

D
k

FTF

Overview of valve bodies for GEMÜ 655

Connection code 52 53 58
Material code 8 13 52 8 13 52 8 13 52
DN
25 - - - X X X X X X
40 - - - X X X X X X
50 - - - X X X X X X
65 - - - X X X X X X
80 - - - X X X X X X
100 - - - X X X X X X
125 - - - X X X X X X
150 - - - X X X X X X
200 X X X - - - X X X
250 X X X - - - X X X
300 X X X - - - X X X

3
655
 Diaphragm dimensions
øA B øC D d e h W H α β γ Y Number
of
DN NPS bolt holes

25 1” 64 51 90 70 9.0 5 8 1/4” 36 - - - - 4
40 1 1/2” 64 51 90 70 9.0 5 8 1/4” 36 - - - - 4
50 2” 101 82 159 128 13.5 6 10 5/16” 64 - - - - 4
65 2 1/2” 101 82 159 128 13.5 6 10 5/16” 64 - - - - 4
80 3” 175 - 223 - 13.5 6 12 5/16” 80 56° 34° - - 6
100 4” 175 - 223 - 13.5 6 12 5/16” 80 56° 34° - - 6

Technical data sheet

125 5” 255 - 287 - 13.5 8 16 5/8” 115 20° 40° 60° - 8
150 6” 255 - 287 - 13.5 8 16 5/8” 115 20° 40° 60° - 8
200 8” 305 - 341 - 18.5 8 20 5/8” 145 30° 40° 40° - 8
250 10” 381 - 410 - 17.0 10 20 5/8” 178 15° 30° 25° 20° 12
300 12” 528 - 576 - 22.0 12 25 1” 280 18° 24° 24° 24° 14
The thread of the diaphragm pin corresponds to Whitworth standard.

Bolt holes

Should there be any doubts or misunderstandings, the German

version of this data sheet is the authoritative document!
Fabric reinforcement
DN 250
DN 80 to 100
Bolt holes

DN
DN 25 to 65
25 bis 65

DN 125 to 200
DN 300
Subject to alteration · 12/2011 · 88048759

For further metal diaphragm valves, accessories and other products,

please see our Product Range catalogue and Price List.
Contact GEMÜ.

VALVES, MEASUREMENT
AND CONTROL SYSTEMS

GEMÜ Gebr. Müller · Apparatebau GmbH & Co. KG · Fritz-Müller-Str. 6-8 · D-74653 Ingelfingen-Criesbach · Tel. +49 (0) 7940/123-0 · Telefax +49 (0) 7940/123-224
info@gemue.de · www.gemu-group.com