Control system for a pneumatic valve actuator

Details Control system for a pneumatic valve actuator Control system for a pneumatic valve actuator

1994-12-20

1996-07-23

Michalsky, Gerald A.

Fluid handling

With indicator, register, recorder, alarm or inspection means

Plural

137 85, 137551, F16K 3700

Patent

active

055380360

ABSTRACT:
A control system for a pneumatic valve actuator comprising three operating blocks memorizing respectively the values of the spring pressure p.sub.m, the counter-thrust pressure p.sub.c and the friction pressure p.sub.a for the various valving member position values, said blocks being connected in parallel and, via a switch, to the valving member position transducer or to the set position generator and connected to the pressure computing block connected via a second switch to the pressure generator or, together with the value read by a transducer for the pressure existing in the actuator, to a differentiator connected to two multiplier units for K and for (1-K) respectively, which are connected to the transit memory of the p.sub.c operating block and to the p.sub.a operating block respectively, the switches being driven by a logic control unit which switches over when the valving member is at rest. Means are provided for sensing anomalies and the extent of wear.

REFERENCES:
patent: 4637002 (1987-01-01), Sallas
patent: 4896101 (1990-01-01), Cobb
patent: 4976144 (1990-12-01), Fitzgerald
Advances in Instrumentation and Control, vol. 46, Part 2, 1991, pp. 1175-1185, Ken Beatty, "Intelligent Valve Based Process Sensing and Control" .

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