Two-stage control valve

Details Two-stage control valve Two-stage control valve

1976-04-15

1978-03-14

Nilson, Robert G.

Fluid handling

Systems

Sequentially progressive opening or closing of plural valves

251121, 251127, F16K 154

Patent

active

040785823

ABSTRACT:
The preferred embodiments of the invention disclosed herein comprise a first or main control valve means and a second valve means including a pressure reducing valve arrangement both controlled by the same actuator means. Initial operation of the actuator means opens the second valve means and its further operation opens the first valve means. The valve means are constructed and arranged so that inlet pressure provides a force tending to close the first valve means and another force which tends to open the second valve means whereby proper sequential operation of the valves is assured and so that the force acting to open the second valve is transmitted to the first valve when it is being opened.

REFERENCES:
patent: 3624753 (1971-11-01), Brumm

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