FLOW RATE CONTROL VALVE FOR CONSTRUCTION MACHINE

Title:

FLOW RATE CONTROL VALVE FOR CONSTRUCTION MACHINE

Document Type and Number:

WIPO Patent Application WO/2014/200131

Kind Code:

A1

Abstract:

Disclosed is a flow rate control valve for a construction machine for controlling operating oil supplied from a hydraulic pump to a hydraulic actuator. A flow rate control valve for a construction machine according to the present invention comprises: a valve body having a pump channel for receiving operating oil from a hydraulic pump, a supply channel connected to the pump channel, and an actuator port connected to a hydraulic actuator; a spool installed inside the valve body to be switchable such that, when switched in response to application of signal pressure, the spool selectively causes the supply channel and the actuator port to communicate with each other; a tank channel installed inside the valve body and connected to an operating oil tank; and an orifice formed in the spool to have an inlet formed on an end, to which the signal pressure is applied, and an outlet communicating with the tank channel, wherein, when the spool is initially actuated, a part of the signal pressure is discharged to the operating oil tank via the orifice.

Inventors:

PARK SUNG-BOK (KR)
CHOI JIN-YOUN (KR)

Application Number:

PCT/KR2013/005257

Publication Date:

December 18, 2014

Filing Date:

June 14, 2013

Export Citation:

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Assignee:

VOLVO CONSTR EQUIP AB (SE)
PARK SUNG-BOK (KR)
CHOI JIN-YOUN (KR)

International Classes:

F15B13/02

Foreign References:

JP2003269626A	2003-09-25
US4424672A	1984-01-10
JP2001165349A	2001-06-22
JPH0633916A	1994-02-08
JPH06300006A	1994-10-25

Other References: