Mechanical shift, pneumatic assist pilot valve

Details Mechanical shift, pneumatic assist pilot valve Mechanical shift, pneumatic assist pilot valve

1994-10-11

1996-06-18

Berisch, Richard A.

Pumps

Condition responsive control of pump drive motor

By controlling drive motor motive fluid

417393, 417395, 251 31, 91313, F04B 4900, F04B 4310, F04B 4306

Patent

active

055271600

ABSTRACT:
A pneumatic assist valve receives constant air pressure from supply air to provide the pneumatic assist to shift the pilot, eliminating false signals acting on the trip rod and the design also assures the pilot has completely shifted before diaphragm reversal occurs.

REFERENCES:
patent: 3838946 (1974-10-01), Schall
patent: 4854832 (1989-08-01), Gardner et al.
patent: 5232352 (1993-08-01), Robinson
patent: 5277555 (1994-01-01), Robinson

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