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W68 / W88 / W98 Series - Throttling/Regulating Single Seat Valves

FEATURES

A modular family of "throttling or pressure control" valves that are the ultimate in: easy cleaning, high pressure, low maintenance design. With 11 standard bodies, 12 different actuators, 4 stem types, flush or standard adapter, and a wide range of control tops, the valves can be configured to precisely fit any application.

  • Bodies machined from solid bar 316L with laser welded ports
  • Stems available with low and high flow Cv values
  • Seat ring inserts for very low Cv in 1" and 1½" (25mm and 38mm) bodies
  • Standard "S" clamps used to connect adaptors and bodies
  • Adaptor and lower bearing carrier with inlet and discharge flush connections
  • High pressure capability
  • Seal options – Tri-Ring (FKM or EPDM for complete shut-off) or Metal Plug
  • Open yoke 3-A design
  • Reverse (R) or standard plug design
  • Pneumatic and electropneumatic positioners available
Key Applications

Model Types

  • W68 Series – Throttling
  • W88 Series – Aseptic Stem Flush Throttling
  • W682 or W882 Series – Divert Throttling
  • W685 or W885 Series – Non-Slamming Divert Throttling

Configurations Pneumatic Moore positioners - Uses 3-15 psi (.20-1.03 bar) pneumatic control signal and plant air supply to drive the seat plug into a certain position.

  • Direct acting (as input increases, supply air increase)
  • Reverse acting (as input increases, supply air decreases)
  • Cost effective way to control the valve

Electropneumatic Bürkert positioners - Uses a 4-20mA electronic feedback signal between the valve stem sensor and a solenoid in the control top which adds or vents air into the actuator to move the plug seat up or down depending on the desired position.

  • Positioner attaches right to the valve
  • Includes all of the controlling functions within the unit
  • Long service life
  • Also available with bus communication (DeviceNet, Profibus) and additional control options

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