Valve positioner and method of making same

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

1978-09-12

1980-08-19

Cohan, Alan

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

123568, F16K 3112, F02M 2506

Patent

active

042180406

ABSTRACT:
A self-contained valve positioner having a single valve positioner housing including an actuator portion 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 magnitudes of first and second pneumatic signals directed to the valve positioner and one of which is being utilized as the fluid source therein for pneumatically operating the actuator unit, the single valve positioner housing including a pilot valve portion having a pilot valve relay disposed therein that initially receives the pneumatic signals and causes the one signal to operate the actuator unit in a manner to progressively open the valve member as the first signal being directed to the value positioner progressively increases from a first value to a second value and thereafter to progressively close the valve member as the first signal being directed to the valve positioner progressively increases from the second value to a third value. The pilot value relay sets the second and third values in relation to the magnitude of the second signal being directed to the value positioner.

REFERENCES:
patent: 2077515 (1937-04-01), Campbell
patent: 2879783 (1959-03-01), Taplin
patent: 3739797 (1973-06-01), Caldwell
patent: 3796049 (1974-03-01), Hayashi
patent: 3834366 (1974-09-01), Kingsbury
patent: 3974807 (1976-08-01), Nohira et al.
patent: 4047510 (1977-09-01), Nakajima et al.
patent: 4056083 (1977-11-01), Wakita
patent: 4099539 (1978-07-01), Brakebill
patent: 4143850 (1979-03-01), Brakebill
patent: 4149501 (1979-04-01), Gropp

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