FLOW RATE CONTROL VALVE FOR CONSTRUCTION MACHINE
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United States of America Patent
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Issued Date -
May 12, 2016
app pub date -
Jun 14, 2013
filing date -
Jun 14, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
Disclosed is a flow rate control valve for a construction machine. A flow rate control valve for a construction machine 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 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.
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