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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
Sizes: 1" - 6" Tube O.D. (25 mm - 152 mm) Materials Product Wetted: ASTM 316L (UNS-S31603); (DIN-1.4404) Non-Product: ASTM 304 (UNS-S30400); (DIN-1.4301) Seat Material:
- Metal
- Tri-Ring
Elastomers:
- FKM (Standard)
- EPDM (Option)
Finish: < 32Ra (<0.8 µm) Other finishes available upon request
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