Valves and valve actuation – Balanced valves – Reciprocating
Patent
1999-03-30
2000-06-27
Shaver, Kevin
Valves and valve actuation
Balanced valves
Reciprocating
251324, 13762569, F15B 1302, F16K 324, F16K 3904
Patent
active
060796944
ABSTRACT:
The fluid pressure device includes a valve housing 2 in which a spool hole 14 is formed, and a spool 18 having a first spool portion 22 inserted in the spool hole 14, and the spool portion 22 is movable with respect to the first hole portion 26 of the spool hole 14 in its axial direction. More fluid grooves 110 are formed in the first spool portion 22. Pressurized fluid acting on one side of the fluid groove 110 have pressure higher than that of pressurized fluid acting on the other sides of the fluid groove 110. A first gap between an outer peripheral surface of the one side of the seal portion and an inner peripheral surface of the first hole 26 between the adjacent fluid groove 110 is set slightly greater than a second gap between an outer peripheral surface of the other side of the seal portion and the inner peripheral surface of the first hole.
REFERENCES:
patent: 3260501 (1966-07-01), Raymond
patent: 3762443 (1973-10-01), Sorenson
patent: 4651776 (1987-03-01), Nakano et al.
Japanese article--Hydraulics and Pneumatics Handbook--Edited by Japan Hydraulics and Pneumatics Academy.
Kawasaki Jukogyo Kabushiki Kaisha
Shaver Kevin
Welsh John P.
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