圧力制御弁

Japanese Patent JP5486199

B2

A pressure control valve is provided, which can variably control the set pressure of a relief valve in accordance with pilot signal pressure that is controlled in an operator's seat and so on when the set pressure of the relief valve required in a replaced working device is changed. The pressure control valve includes a sleeve having an inlet port (1a) and a tank path (1b), a poppet (2) opening/closing a flow path between the inlet port (1A) and the tank path, a poppet spring elastically supporting the path between the inlet port and the tank path in a closed state, a valve sheet (3) installed to face the poppet so that a set pressure is formed in a pressure chamber (C) of the sleeve, a pilot poppet draining the hydraulic fluid in the pressure chamber to the hydraulic tank when high pressure that exceeds the set pressure is generated in the pressure chamber, a pilot poppet spring (18) elastically supporting the path of the valve sheet (3) in a closed state, a plug coupled to the sleeve and having a pilot port to receive the pilot signal pressure from an outside, a main piston (17) slidably coupled within a guide coupled to the plug to variably control the set pressure in the pressure chamber in accordance with the pilot signal pressure, and a control plug movably coupled to the guide to control a set pressure of a spring supporting the main piston.

JPS53112381	PRESSURE COMPENSATING ADJUST VALVE
JP6637057	Valve assembly with adjustable spring seat

Man Suk Jeon

JP2009040764A

May 07, 2014

February 24, 2009

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Volvo Construction Equipment Arbor

F16K17/06; F16K17/10

JP59175681A
JP7248067A
JP10030775A
JP9242115A
JP60073683U
JP50107525A
JP46040134B1
JP58057570A
JP56028370A

Kazuo Shigenobu
Hideo Shimizu
Yuichi Takagi
Yoshinao Nakano
Hideki Akiba

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