Modulating positive shutoff mechanism

Details Modulating positive shutoff mechanism Modulating positive shutoff mechanism

1990-03-23

1991-08-20

Nilson, Robert G.

Fluid handling

Processes

25112903, 25112908, 251282, F16K 3106

Patent

active

050405594

ABSTRACT:
A system is utilized for controlling the flow of process fluid between an input port and an output port of a valve. A first mechanism controls the modulation of the valve and a second mechanism controls the positive shutoff. An electrical system is responsible for modulation adjustments and a pneumatic system is responsible for positive shutoff control. A third, hydraulic, system is responsible for equalizing the pressure of the process fluid within the valve.

REFERENCES:
patent: 3059667 (1962-10-01), Coceano
patent: 3799498 (1974-04-01), Wickham et al.
patent: 3861643 (1975-01-01), Moffatt
patent: 4335744 (1982-06-01), Bey
patent: 4534375 (1985-08-01), Fox
patent: 4557527 (1985-12-01), Stumpe
patent: 4620561 (1986-11-01), Brewer
patent: 4721284 (1988-01-01), Bankard
patent: 4765587 (1988-08-01), Cummins

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