Valve position controller

Details Valve position controller Valve position controller

1995-03-28

1997-08-05

Elmore, Reba I.

Boots, shoes, and leggings

364510, 1374875, G05B 1116, F16K 3112

Patent

active

056548850

ABSTRACT:
A valve position controller (10) for controlling the position of an industrial-valve element (29, 29') includes a check valve (72, 74) in each of closing and opening pressurized-fluid input lines (68, 70) for respectively leading pressurized fluids from a pressurized source (30) to closing and opening solenoid actuating valves (106, 104) via a common input fork (62). The valve position controller can be changed between a fail-in-place" mode, and a "fail-closed" mode by interchanging input and exhaust lines (68, 88) to an opening actuating valve (64) and reversing electrical operation of a solenoid (104) of the opening actuating valve. A needle valve (94) in a common exhaust line allows speed of the system to be optimized for a set resolution. Locking actuating valves (108, 110) are respectively between the closing and opening actuating valves and a motivator (34, 36) to lock the industrial valve element (29', 29) in position when close and open manual switches (48, 50) are not activated and an auto/manual switch (46) is in a "manual" position.

REFERENCES:
patent: 4096699 (1978-06-01), Zitelli
patent: 4417312 (1983-11-01), Cronin et al.
patent: 4430846 (1984-02-01), Presley et al.
patent: 4744542 (1988-05-01), Heusser
patent: 5081904 (1992-01-01), Horn et al.
patent: 5097857 (1992-03-01), Mayhew
patent: 5198973 (1993-03-01), Steutermann
Automax Inc., Positioners Pneumatic & Electro-Pneumatic, Aug. 1993.
Uni Measure; Transducers to Measure, undated.
Virginia Valve Company Corporation; Electro-Hydraulic & Pneumatic Value Actuation System; undated.

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