Method of making a pilot operated valve positioner

Details Method of making a pilot operated valve positioner Method of making a pilot operated valve positioner

1978-12-11

1980-07-22

Crane, Daniel C.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

B23P 1500, F16K 3112

Patent

active

042132339

ABSTRACT:
A pilot operated valve positioner having a pilot valve unit operated by a pneumatic signal to pneumatically operate an actuator unit carrying a main valve member to position the same relative to its main valve seat in a valve unit in relation to the magnitude of the pneumatic signal, the actuator unit having a range spring and a feedback spring for the pilot valve unit. The springs are coiled compression springs and are substantially concentrically mounted. The pilot valve unit has a feedback positioning diaphragm and part of its housing concentrically disposed in one end of the range spring to render the valve positioner relatively small and compact.

REFERENCES:
patent: 2687868 (1954-08-01), Barrett et al.
patent: 3079898 (1963-03-01), Jensen

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