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Patent Searching and Data


Title:
SPOOL VALVE
Document Type and Number:
WIPO Patent Application WO/2015/108637
Kind Code:
A3
Abstract:
A spool valve (150) is associated with a hydraulic system (100) and includes a valve body (152) delineating an inlet port (164), a relief port (166), and an actuator port (168). A spool (170) is movably disposed inside the valve body (152) between relief position, an opened position, and a modulating position (336). A solenoid (190) can initially urge the spool (170) from the relief position to the opened position to establish fluid communication between the inlet port (164) and the actuator port (168). As a result, flow forces can further urge the spool (170) to the opened position. When fluid communication between the inlet port (164) and the actuator port (168) ceases, the spool (170) moves to a modulating position (336).

Inventors:
BARNGROVER MICHAEL (US)
WEAR DANIEL G (US)
Application Number:
US2014/069989
Publication Date:
November 12, 2015
Filing Date:
December 12, 2014
Export Citation:
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Assignee:
CATERPILLAR INC (US)
International Classes:
F16K11/07; F15B13/02
Foreign References:
US5911245A1999-06-15
US20030019531A12003-01-30
US4467700A1984-08-28
US5597118A1997-01-28
US4009864A1977-03-01
Attorney, Agent or Firm:
GREENE, Jeffrey A. et al. (P.O. Box 2409Minneapolis, Minnesota, US)
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