Valve actuator

Details Valve actuator Valve actuator

1993-01-06

1995-05-02

Hepperle, Stephen M.

Valves and valve actuation

Fluid actuated or retarded

With mechanical movement between actuator and valve

251229, 251233, 251255, F16K 31163

Patent

active

054112397

ABSTRACT:
A control valve having a pneumatic actuator and positioner to move the stem of a globe-type valve. The actuator has a spring-opposed piston that moves a chassis including a cam with an inclined plane. The inclination of the cam plane can be varied to precisely displace the valve stem. The amount of displacement selected, together with a specific valve plug contour, yield a specific maximum flow coefficient of the valve at that setting. The setting can be changed to accommodate moderate to very low fluid flows. A numerical display on the actuator may be used to register the flow coefficient selected.

REFERENCES:
patent: 3082782 (1963-03-01), Schuder
patent: 3508567 (1970-04-01), Kirk et al.
patent: 3608862 (1971-09-01), Paxton
patent: 4050670 (1977-09-01), Borg et al.
patent: 4237925 (1980-12-01), Urushida
patent: 4467834 (1984-08-01), Rochat et al.
patent: 4545560 (1985-10-01), Marcadet et al.
patent: 4700735 (1987-10-01), Hamernik et al.

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