Sequentially operated valve structure

Details Sequentially operated valve structure Sequentially operated valve structure

1980-10-10

1982-02-02

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

137492, 1375123, 137529, 137853, 251 611, F16K 1500

Patent

active

043134629

ABSTRACT:
In a valve wherein a flexible tube is stretched around a circular barrier between inlet and outlet slots and is conditioned to enable flow in an annular path around the barrier when upstream pressure overcomes pressure in a control jacket around the tube, the improvement comprising a second flow path directly through the barrier, which is normally closed off by a poppet valve engagable with a seat around the passage. A spring augmented by a control pressure biases the valve toward closed position and is preferably set so that, only after capacity of the flexible tube is reached or approached, does the poppet valve open to answer the need for high pressure demand downstream or for relief of a high pressure surge upstream.

REFERENCES:
patent: 3727623 (1973-04-01), Robbins
patent: 4138087 (1979-02-01), Kruse

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