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

1980-12-16

Schwadron, Martin P.

Valves and valve actuation

Fluid actuated or retarded

Flexible wall expansible chamber reciprocating valve actuator

123568, 92 49, F16K 31126, F01B 1900, F02M 2506

Patent

active

042391814

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 actuator unit having structure in the housing to cause 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 valve positioner progressively increases from the second value to a third value.

REFERENCES:
patent: 3565109 (1971-02-01), Smith
patent: 3800765 (1974-04-01), Thompson
patent: 3834366 (1974-09-01), Kingsbury
patent: 4009700 (1977-03-01), Engels et al.
patent: 4056083 (1977-11-01), Wakita
patent: 4120480 (1978-10-01), Ando et al.
patent: 4163543 (1979-08-01), Cook

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