Fluid handling – With repair – tapping – assembly – or disassembly means – Removable valve with normally disabled supplemental check valve
Patent
1977-02-11
1978-10-17
Schwadron, Martin P.
Fluid handling
With repair, tapping, assembly, or disassembly means
Removable valve with normally disabled supplemental check valve
137285, 137360, 13761419, 251DIG1, 251360, 251364, F16K 4300
Patent
active
041203143
ABSTRACT:
A hydraulic actuator for use in operating a remotely located flush valve includes a housing having fluid inlet and outlet ports, each of which are connected to the flush valve through tubes or the like with the inlet port being under fluid pressure derived from the flush valve. There are passage means connecting the ports with first and second seal members being positioned in the passage means. A stem is movable in the housing with the first and second seal members being positioned on and movable with the stem. A spring positioned within the housing urges the stem toward a position in which the second seal member closes communication between the inlet and outlet ports. The first seal member is located closer to the inlet port than the second seal member and is removable from the stem. There is a seat for the first seal member with fluid pressure at the inlet urging the first seal member, after removal from the stem, toward the seat to close communication between the inlet and outlet.
REFERENCES:
patent: 956082 (1910-04-01), Hannigan
patent: 1011093 (1911-12-01), Tanner et al.
patent: 1447457 (1923-03-01), Yeiser
patent: 1768212 (1930-06-01), Reedy
patent: 1787947 (1931-01-01), Lehnert
patent: 2542390 (1951-02-01), Brown
patent: 2569023 (1951-09-01), Sanford
patent: 2666614 (1954-01-01), Grove et al.
patent: 2989990 (1961-06-01), Bass et al.
patent: 3617027 (1971-11-01), Scaramucci
patent: 3695288 (1972-10-01), Billeter et al.
Schwadron Martin P.
Sloan Valve Company
Walton G. L.
LandOfFree
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