SWITCHING VALVE, SWITCHING HYDRAULIC SYSTEM, AND CRANE

WIPO Patent Application WO/2016/138865

A1

A switching valve, switching hydraulic system, and crane. The switching valve has a working oil inlet (P) and a working oil return port (T), comprising at least two sets of valve oil ports in pair. Cartridge valves in pair are provided between each set of valve oil ports in pair and the working oil inlet (P) and provided between each set of valve oil ports in pair and the working oil return port (T). The cartridge valves are controlled to be open or closed to enable the working oil inlet (P) and the working oil return port (T) to be switched between communications with the at least two sets of valve oil ports in pair. By controlling the cartridge valves to be open or closed, the switching valve enables or disables the communication between the working oil inlet (P) and the at least two sets of valve oil ports in pair and the communication between the working oil return port (T) and the at least two sets of valve oil ports in pair, stably enabling a hydraulic pump system to switch between communications with at least two closed systems, reducing the number of pumps in a hydraulic system, greatly reducing cost of a hydraulic system and total vehicle weight, and having a higher reliability.

SHAN ZENGHAI (CN)
WANG SHOUWEI (CN)
REN YINMEI (CN)
ZHAO LEI (CN)
QI HOUBAO (CN)
WANG DONG (CN)

PCT/CN2016/075399

September 09, 2016

March 03, 2016

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XUZHOU HEAVY MACHINERY CO LTD (CN)

B66D1/08; B66D1/44; F15B13/02

CN104632746A	2015-05-20
CN204111196U	2015-01-21
CN202988589U	2013-06-12
CN103896156A	2014-07-02
CN103807232A	2014-05-21
EP1172325A2	2002-01-16
EP1163454A1	2001-12-19
US8522541B2	2013-09-03

CCPIT PATENT AND TRADEMARK LAW OFFICE (CN)
中国国际贸易促进委员会专利商标事务所 (CN)

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