Fluid flow controller

Details Fluid flow controller Fluid flow controller

1991-12-23

1993-02-23

Hepperle, Stephen M.

Valves and valve actuation

Mechanical movement actuator

Screw

2513352, F16K 3150

Patent

active

051883384

ABSTRACT:
In a diaphragm type control valve, a slide stem (14) having a coupling screw part (14a) is elevatably but non-rotatably inserted into a bonnet (11) having a coupling screw part (11c). A rotary stem (15) has concentrically a first coupling screw part (22) of thread pitch P1 inside, and a second coupling screw part (23) of thread pitch P2 larger than the thread pitch P1 outside is coaxially disposed above the slide stem (14), the first coupling screw part (22) being driven into the coupling screw part (14i c) of the slide stem (14), and the second coupling screw part (23) into the coupling screw part (11c) of the bonnet (11), so that the slide stem (14) is moved vertically by a small distance at each revolution of the rotary stem (15).

REFERENCES:
patent: 2388989 (1945-11-01), Mueser
patent: 2654559 (1953-10-01), Franck
patent: 2812777 (1957-11-01), Dahl
patent: 3409271 (1968-11-01), Kallenbach
patent: 3428291 (1969-02-01), Callahan et al.

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