Valve positioner and method of making the same

Details Valve positioner and method of making the same Valve positioner and method of making the same

1978-05-22

1980-05-13

Schwadron, Martin P.

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

123119A, F16K 3112, F02M 2506

Patent

active

042025249

ABSTRACT:
A self-contained valve positioner having a single valve positioner housing including an actuator portion and having a pneumatically operated actuator unit therein carrying a main valve member to position the main valve member relative to a main valve seat in a valve unit in relation to the magnitude of a single pneumatic signal directed to the valve positioner and being utilized as the fluid source therein for pneumatically operating the actuator unit, the housing including a pilot valve portion and the actuator unit having a pilot valve relay disposed in the pilot valve portion and that initially receives the pneumatic signal and causes the signal to operate the actuator unit to progressively open the valve member as the signal being directed to the valve positioner progressively increases from a first value to a second value and thereafter to progressively close the valve member as the signal being directed to the value positioner progressively increases from the second value to a third value.

REFERENCES:
patent: 3931813 (1976-01-01), Horie et al.
patent: 3974807 (1976-08-01), Nohira et al.
patent: 4033308 (1977-07-01), Hayashi et al.
patent: 4047510 (1977-09-01), Nakajima et al.
patent: 4056083 (1977-11-01), Wakita
patent: 4066056 (1978-01-01), Nohira et al.
patent: 4116182 (1978-09-01), Bradshaw
patent: 4137874 (1979-02-01), Otsubo et al.

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