| 摘要 |
PURPOSE:To keep off such nonconformity that a handwheel is suddenly turned back, by having a relief valve built in a housing where a control valve and a metering mechanism are housed, and setting up a kickback preventive check valve at the more downstream side than the said valve. CONSTITUTION:A sleeve 6 constituting a control valve 4 is rotatably housed in a housing 2, and a metering mechanism 14 is installed in the side of the control valve 4. This metering mechanism is constituted of an internal gear stator 22 and an external gear rotor 24, eccentrically rotating, inside this stator 22. And, a balance piston type relief valve 60 is built in the housing 2. In this constitution, a kickback preventive check valve 104 inclusive of a ball valve 100 is installed in a connecting part with an inflow passage 32 into the control valve 4 in a pump port 28 of the housing 2. This check valve 104 is set up at each downstream side of a relief inflow passage 72 of the relief valve 60 and a pilot passage 82.
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