Check valve

Details Check valve Check valve

1988-05-12

1989-10-31

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

F16K 1502

Patent

active

048770523

ABSTRACT:
A check valve comprises a plurality of poppets and a plurality of springs for urging the poppets, and the poppets and the springs are coaxially disposed. More specifically, the check valve comprises a case, an outer poppet slidably and sealingly inserted into the case, a first spring disposed between the case and the outer poppet for urging the outer poppet, an inner poppet slidably and sealingly inserted into the outer poppet, and a second spring disposed between the inner poppet and the outer poppet for urging the inner poppet. A check valve is free from clogging of contaminations under the contaminated environments. The check valve can stop flow of fluid when the seat surface or spring is damaged or broken.

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

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