PILOT-OPERATED ELECTRIC PROPORTIONAL HIGH-PRESSURE RELIEF VALVE

WIPO Patent Application WO/2022/068046

A1

Provided is a pilot-operated electric proportional high-pressure relief valve, comprising: a main valve (1), a pilot valve (2), and a proportional solenoid assembly (3), connected in sequence, the main valve (1) having an oil inlet (111) and a relief port (112); the pilot valve (2) comprises a first transition sleeve (21) and a pilot spool (22) and pilot screw plug (23) nested in the first transition sleeve (21); the pilot spool (22) abuts against a stepped ring edge (213) within the first transition sleeve (21) and, together with the first transition sleeve (21), is arranged surroundingly to enclose a first accommodating chamber (100) and a second accommodating chamber (200); the pilot spool (22) and pilot screw plug (23) are arranged surroundingly to enclose a third accommodating chamber (300); a first axial action area (A1) of the hydraulic oil in the first accommodating chamber (100) on the pilot spool (22) is larger than a second axial action area (A2) of the hydraulic oil in the third accommodating chamber (300) on the pilot spool (22); the proportional solenoid assembly (3) is arranged to generate thrust on the pilot spool (22) to engage the pilot spool (22) against the stepped ring edge (213).

WU SHAOZE (CN)
REN JIAN (CN)
DONG ZHAOSHENG (CN)

PCT/CN2020/134210

April 07, 2022

December 07, 2020

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WEICHAI POWER CO LTD (CN)
LINDE HYDRAULICS CHINA CO LTD (CN)

F16K31/06; F16K11/065

CN103233936A	2013-08-07
CN203670808U	2014-06-25
CN104696315A	2015-06-10
CN102444637A	2012-05-09
CN209370185U	2019-09-10
CN103122882A	2013-05-29
US20130081714A1	2013-04-04
US20050045229A1	2005-03-03
CN202011062690A	2020-09-30

BEYOND ATTORNEYS AT LAW (CN)

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