Invention Grant
- Patent Title: Metering valve with integral relief and makeup function
- Patent Title (中): 计量阀具有一体化的浮雕和化妆功能
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Application No.: US11214957Application Date: 2005-08-31
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Publication No.: US07258058B2Publication Date: 2007-08-21
- Inventor: David P. Smith , Daniel T. Mather , Wayne W. Lark
- Applicant: David P. Smith , Daniel T. Mather , Wayne W. Lark
- Applicant Address: US IL Peoria JP
- Assignee: Caterpillar Inc,Shin Caterpillar Mitsubishi Ltd.
- Current Assignee: Caterpillar Inc,Shin Caterpillar Mitsubishi Ltd.
- Current Assignee Address: US IL Peoria JP
- Agency: Finnegan, Henderson, Farabow, Garrett & Dunner
- Main IPC: F15B13/04
- IPC: F15B13/04

Abstract:
A metering valve for a work machine hydraulic system is disclosed. The metering valve has an inlet and an outlet, a main poppet, and a solenoid-operated pilot element. The main poppet is movable to pass fluid from the inlet to the outlet, and to block fluid from the inlet to the outlet. The solenoid-operated pilot element is movable between a first position at which pressurized fluid from the inlet pressurizes a control chamber in communication with a control end of the main poppet to urge the main poppet toward the flow-blocking position, and a second position at which the control chamber is communicated with a drain to move the main poppet toward the flow-passing position. The metering valve also has a relief valve element configured to drain pressurized fluid from the control chamber to move the main poppet toward the flow-passing position in response to a pressure at the inlet exceeding a predetermined pressure.
Public/Granted literature
- US20070044649A1 Metering valve with integral relief and makeup function Public/Granted day:2007-03-01
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