SED – Steripur 217.25 Diaphragm valve

Pneumatical operated with Stainless steel Bonnet and Actuator


  • High cycle stainless steel piston actuator
  • Compact design
  • Low control air volume, high switching speed
  • High repeatablity
  • Control air connection on the top
  • Direction of control air connection is mountable in 90° rotations
  • CDSA sealing concept
  • Flexible diaphragm suspension
  • Clean and polished exterior design ideal for sterile wash downs


Suitable for

Multiport bodies, T-bodies, Tank bottom bodies, Two-way bodies, Welded configurations


Butt Weld, Flange, Tri-Clamp


SF1, SF4

Man. process



316L (1.4435)



Weld connection

ASME-BPE, BS-4825, DIN 11850, ISO 1127, SMS 3008




This valve is available in two different designs. The type 217.30 is available in the control function fail safe close (normally closed) and performs at a higher working pressure for standard application. The type 217.25 in control function fail safe close is mainly designed for filling applications or all other where the working pressure is lower.

Romynox supplies Steripur membrane valves from SED for high purity applications in the pharmaceutical, food and cosmetic industry and fine chemistry.

One advantages of this design are a longer diaphragm life time because there spring force is less. Other advantages of this design are a very high cycle life and a smaller overall dimensional height. Type 217.25 is also available in control functions fail safe open and double acting for standard working pressures.

The valve is predestined for applications with high purity, dirty and aggressive fluids, and gases. Smooth surfaces, no explored nuts, no edges, and outside self-draining in all assembly positions, this makes for a Very Optimised wash down design. The Steripur is used where diaphragm valves entirely of stainless steel add value, such as clean rooms or aggressive (corrosive) environment.


  • The stainless steel actuator with stainless steel piston has a long service life, and endures many (repeating) cycles
  • Compact design, which provides advantage in multiport bodies and manifold valve assemblies
  • Low air volume, but high switching speed
  • The air connection to the actuator can be placed at the four different positions (with 90° rotation) in relation to the flow direction, so that there is always a position suitable for the setup.
  • CDSA sealing concept
  • Flexible membrane suspension
  • The polished stainless steel surface is ideal for sterile cleaning procedures

Technical information

seizeBuis: IMP 1/4″ tot 1/2″, DN 4 tot DN 15
Membraan: MA 8
Max. Pressure8 bar (EPDM)
7 bar (PTFE/EPDM)
Temp. range-20 ºC to 140 ºC (EPDM)
-20 ºC to 150 ºC (PTFE/EPDM)
weight0.,44 kg
type connectionTri-clamp connectie (ISO, ASME-BPE, DIN 32676), Flange, Butt Weld
weld connectionISO 1127, ASME-BPE, DIN 11850, BS-4825, SMS 3008
Material– Body, connections: 316L (1.4435) Forged
– Bonnet: 316L (1.4435)
– Actuator: 316L (1.4435)
– Membranes: EPDM, PTFE/EPDM
controlPneumatische Actuator
Control functionNormally Closed, Normally Open or Double Acting
Certificates (standard)3.1 material, FDA, USP Class VI 121 ºC, {87}, {88}, EHEDG, PED, CE1935/2004, TSE/BSE
Certificates (optional)2.2 surface finish, ATEX 2GD


  • Investment cast
  • Surface finish Ra value to max 0.25 μm
  • Other materials
  • Client specific connections
  • Available with a wide range of control equipment and accessories
  • Autoclavable
  • Type 217.25 is also available in control functions ‘fail safe open’ and ‘double acting for standard working pressures