Fluid handling – Systems – Multi-way valve unit
Patent
1991-03-11
1991-09-17
Cohan, Alan
Fluid handling
Systems
Multi-way valve unit
13762524, 13762568, 91375R, F15B 908, F16K 1107
Patent
active
050485679
ABSTRACT:
A hydraulic control valve which comprises a casing having an oil inlet channel and an oil outlet channel and formed with groove portions and land portions arranged alternately in a specified direction, and a valve member having a return oil channel and attached to the casing so as to be movable relative thereto in the specified direction, the valve member having groove portions and land portions arranged alternately in the specified direction, the groove portions and the land portions of the casing being opposed to the land portions and the groove portions of the valve member respectively when the valve is in a neutral state, permitting oil supplied from the oil inlet channel to flow into the return oil channel, the valve member being movable from the neutral state relative to the casing for the land portions of the casing and the valve member to block communication betwen the oil inlet channel and the return oil channel to permit the oil supplied from the oil inlet channel to flow into the oil outlet channel. The land portion of the casing or the valve member is formed with a recess for permitting the oil supplied from the oil inlet channel to flow therethrough into the return oil channel when the amount of movement of the valve member from the neutral state relative to the casing becomes greater than a predetermined valve.
REFERENCES:
patent: 4452274 (1984-06-01), Haga
patent: 4516471 (1985-05-01), Duffy
patent: 4577660 (1986-03-01), Haga
Motoyama Tatsuro
Noguchi Masahiko
Cohan Alan
Koyo Seiki Co., Ltd.
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
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