Fluid handling – Line condition change responsive valves – Bi-directional flow valves
Patent
1974-08-02
1976-03-09
Schwadron, Martin P.
Fluid handling
Line condition change responsive valves
Bi-directional flow valves
13759612, F16K 1718
Patent
active
039425509
ABSTRACT:
A dual-acting relief valve is shown which senses fluid pressure above a desired amount in either of two control conduits and operates to interconnect the conduits, thus permitting a higher pressure to be vented to the lower pressure. The two conduits are interconnected by means of an intersecting chamber containing a ported sleeve and either a poppet valve on a stem or a slide valve in association with an isolation piston axially movable in the sleeve for interrupting communication between the conduits. One end of the isolation piston is connected to sense the pressure in one of the conduits, which pressure is opposed by a spring located in a chamber connected to return fluid pressure and thus isolated from control pressure. A bore internal of the valve stem connects the other control conduit with a chamber between the isolation piston and the valve stem. Thus, pressures in excess of spring pressure in the first conduit will act against the isolation piston to move it and the valve member in a direction to interconnect the control conduits. Overpressures in the second conduit are sensed through the bore internal of the valve stem, grounding the isolation piston and forcing the valve member in the same direction as before to interconnect the two control conduits.
REFERENCES:
patent: 2699178 (1955-01-01), Adams et al.
patent: 3608859 (1971-09-01), Hetzer
patent: 3756558 (1973-09-01), Okui
patent: 3792715 (1974-02-01), Parrett et al.
patent: 3827336 (1974-08-01), Caywood et al.
Miller Robert J.
Schwadron Martin P.
Smith Robert C.
The Bendix Corporation
Thornton William F.
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