SW4 Series - Single Seat Valves

Product Type(s) : Single Seat Valves
Description :

The SW4 series hygienic single seat flow control valve is highly versatile and fulfills the demands of today’s processing industries. The hygienic valve design makes it ideal for applications in dairy, processed foods, beverage, brewery, and chemical industries.



Advantages of the SW4 Single Seat Valve:

  • Extra wall thickness of valve housing reduces stress in the seat area
  • Wear resistant elastomer/PTFE shaft seal and bearings increase seal lifetime
  • Installation and maintenance convenience
  • Profile seals with marking for easy identification
  • Metallic stop provides for defined compression of seat seal
  • Ball shaped housing prevents sump or dome, reducing CIP cleaning times
  • Clamp closure provides for quick and easy valve maintenance
  • Many different housing configurations
  • 3-A approved

All product-wetted parts are made of AISI 316 L / 1.4404 (DIN EN 100888) stainless steel. Seal materials are EPDM (standard), HNBR, FPM (options)

Valve variants:

  • With manual actuation (SW4 H)
  • Divert valve (SWS4)
  • Tank outlet version (SWT4)
  • High-pressure design (SWhp4)
  • With steam barrier (SW4 DPF)
  • Long stroke version (SW4 long stroke) for highly viscous products or larger particles
  • With modulating cone (SWR4)
  • Tangential inlet / outlet
  • ATEX compliant models
  • 3-A version

Nominal dimensions: DN 25 – DN 150 / 1” – 4”, 6”

Theory of Operation

How does a single seat control valve work ?

Single seat control valves are used in a variety of processing applications to shut-off and to change over processing lines.  The operation to close or open the valve (by moving the valve stem) is performed by a pneumatic actuator with air connection and reset by spring force. 

The following designs are possible by way of different actuator assemblies:

  • NC:  Actuator normally closed / air-to-raise, spring-to-lower
  • NO:  Actuator normally open / air-to-lower, spring-to-raise

The standard SW4 design is equipped with a control unit CU4 Direct Connect.  The luminous diodes in the control unit indicate the position of the valve shaft.

Parts of an SW4 Single seat control valve:

  1. Control unit
  2. Actuator screw
  3. Actuator
  4. Yoke
  5. Housing
  6. Shaft
  7. Upper housing
  8. Housing
  9. Shaft

Single Seat Valve

Change-over Valve


Sizes:  1" - 4", 6" / DN25 - DN150 Product Wetted Parts:  AISI 316L Non-Product Wetted Parts:  AISI 304 Seal Materials: 

  • Standard EPDM
  • Optional: HNBR, FPM

Min. Control Air Pressure: 87 PSI (6 bar) Max. Control Air Pressure: 116 PSI (8 bar)


Optional Equipment:

  • Stroke limitator (1” - 4” and DN25-100)
  • Crank handle for manual operation (1” - 4”, 6” and DN25-150)
  • Oil damp cylinder (1” - 4” and DN25-100 )
  • Steam barrier
  • Long stroke (2” - 4” and DN50-100)
  • Tangential inlet (1” - 4” sizes only)
  • Proximity holder
  • Tank outlet version
  • 3-A version
  • CU control units

Pressure Ratings:

Operating Pressure:  Maximum line pressure: 145 psi (10 bar)

Temperature Ratings:

Operating temperature: Maximum  275ºF (135°C),  Short time 284ºF (140ºC) - no steam