Slow opening valve

Details Slow opening valve Slow opening valve

1982-06-25

1984-11-20

Chambers, A. Michael

Valves and valve actuation

Mechanical movement actuator

Screw

251267, 251284, 251297, 744248B, 744248VA, F16K 3144

Patent

active

044835124

ABSTRACT:
A valve control having a valve body (5) with an actuator stem (16) and a rotating handle (35) connected to the actuator stem by differential drive mechanism (25, 26) which, during uniform movement of the handle in one direction, initially opens the valve (20) at a relatively slow rate and, thereafter, completes the valve movement at a substantially faster rate. A series of stop rings (44-48) are received about the body in frictional abutting relationship and serially rotated by the handle to uniformly resist handle movement independently of the extent of handle movement.

REFERENCES:
patent: 1696070 (1928-12-01), Wood
patent: 2784934 (1957-03-01), Pauluis et al.
patent: 2906288 (1959-09-01), Young
patent: 3174355 (1965-03-01), De Craene
patent: 3550903 (1970-12-01), Hauser
patent: 3820565 (1974-06-01), Durbin
patent: 4293118 (1981-10-01), Olson et al.

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