Triplex Sales / Valve engineering tool
W68 throttling valve sizing check
Start with flow and the pressure drop across the valve. Calculate required Cv, then compare the published W68 stem choices at the operating points you enter.
This is a preliminary liquid-service screen, not a final valve selection. The published table targets 20-80% stroke, with 50% preferred. Line size alone does not set valve size. For divert, aseptic, or higher-viscosity duty, involve Triplex before specifying hardware.
What this check does not decide
Final sizing needs temperature, vapor pressure/cavitation check, pressure class and adapter/clamp rating, actuator holding force and fail position, seat and elastomer compatibility, connections, and cleaning requirements. The Cv table is an approximate stem/stroke screen, not a promise of installed performance.
Source: W68/W88/W98 control valves, DS-1207 (07/2017), pages 3 and 8. See the W68/W88 instruction manual (rev. 08/2018) and W68/W88 product page.
Come back to Triplex Applications to confirm the selection.
Send your operating range, product and temperature, valve tag, P&ID, and control requirements. We will review the complete valve and actuator assembly with you.
