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Diaphragm Valve Type 188
 

Solenoid Valves

pneumatically operated
DN 8 - 20 mm (3/8" - 3/4")
plastic piston actuator 

Features:

  • Efficient thermoplastic piston actuator direct assembled with the valve body

  • Compact design, the outside diameter of the actuator is the same size as the bonnet flange

  • Actuator high resistance to heat transfer

  • Control air connection 90° to flow direction

  • Encapsulated diaphragm

  • Optical indicator

Optional:

  • Available with a wide range of control equipment and accessories, also for retrofitting

  • Control air connection in flow direction

Technical Data:

Control function (Cf.):   Pneumatically operated
Fail safe close (NC): Cf. 1 & 4
Fail safe open (NO): Cf. 2 & 5
Double acting (DA): Cf. 3 & 6
Direction
Control connection:
  At Cf. 1, 2 & 3, 90° to flow direction, standard
At Cf. 4, 5 & 6 in flow direction
Max. working pressure:
 
  Unidirectional (delta p = 100%)
EPDM diaphragm 8 bar (120 psi)
PTFE diaphragm 7 bar (100 psi) 
Higher working pressure may be achieved with different actuator. Please consult a SED factory representative for working pressure above the indicated maximum.
Max. working temperature:   Standard 80°C (176°F)
HS-Version 150°C (300°F)
dependent on application
Control pressure:   Cf. 1 & 4 4 - 7 bar (60 - 100 psi)
Cf. 2, 3, 5 & 6 4 - 5 bar (60 - 70 psi)
Diaphragm material and Size: EPDM or PTFE
MA 10 all sizes
Valve body material:
 
  Forged 1.4435/ 316 L ASME/BPE
Investment cast 1.4435/ 316 L
Other alloys
End connection:
 
Butt weld ends
Clamps and flanges
Special ends
Actuators suitable for:   Two-Way bodies
Welded configurations
Flow rate: Kv in m3/h
Additional Information: Technical Data
  Ordering Key
  Installation and Mounting Instructions

 

 

 

 


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