Dual check valve

Details Dual check valve Dual check valve

1989-08-16

1990-09-04

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

F16K 1506

Patent

active

049535889

ABSTRACT:
A valve housing is provided with an interior passage therethrough with the passage having two spaced apart valve seats; a first check valve member for engaging the first valve seat has a valve stem movably carried in a hollow shaft; the second valve member is itself provided with a tubular stem having an open end and which is slidably fitted on the exterior of the hollow shaft; separate coil springs are provided for urging each valve member toward a closed position on the respective valve seat whereby the each valve member is operable independently of the other valve member.

REFERENCES:
patent: 1960963 (1934-05-01), Wheeler
patent: 2500156 (1950-03-01), Dechant
patent: 4172469 (1979-10-01), Boehringer
patent: 4185656 (1980-01-01), Braukmann

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