Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1987-03-13
1989-02-07
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
1376275, 251 29, G05D 1606
Patent
active
048025054
ABSTRACT:
A flow-control valve has a valve housing defining a chamber formed with ally offset source, sump, and user ports. A valve body in the chamber has first and second coaxial but axially independently movable parts, the first part having a mainly axial throughgoing passage having one end exposed continuously to one of the source and sump ports and an opposite axially open end axially sealingly engageable with the second valve part. A central seat between the source and sump ports is axially sealingly engageable with one of the valve parts to isolate one of the source and sump ports from the other of the source and sump ports. The parts are displaceable between one end position permitting flow in the chamber between the user and the other port while blocking flow between same and the one port with the valve parts in sealing engagement with each other and the one valve part out of engagement with the central seat, an intermediate position blocking flow in the chamber between the ports with the valve parts in sealing engagement with each other with the one valve part in sealing engagement with the central seat, and a drain end position permitting flow in the chamber between the user and one port while blocking flow between same and the other port.
REFERENCES:
patent: 919300 (1909-04-01), Anderson
patent: 1890494 (1932-12-01), Borden
patent: 2213488 (1940-09-01), Dowrick
patent: 2741262 (1956-04-01), Crookston
patent: 3584652 (1971-06-01), Huntington
patent: 4620567 (1986-11-01), Kurtz
Boulogne Serge J.
Gemignani Andre
Schaumburg Gerald
Dunbo Herbert
Nilson Robert G.
Societe d'Exploitation de Brevets pour l'Industrie et la Marine
Welford Andrew M.
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