Title:
PRE-PRESSING VALVE AND HYDRAULIC REVERSING VALVE
Document Type and Number:
WIPO Patent Application WO/2021/056306
Kind Code:
A1
Abstract:
Disclosed is a pre-pressing valve (100), comprising: a housing (10), having an inner housing cavity (11) which is provided with a first opening (12) and a second opening (13); and a valve seat (20), configured to be movably received in the first opening of the inner housing cavity, a first end (23) of the valve seat being subject to hydraulic pressure. The pre-pressing valve further comprises a pin shaft (60), which is configured to be movably accommodated in the inner housing cavity; a first end (61) of the pin shaft and a second end (24) of the valve seat are configured to contact each other and be fixedly connected or integrated, and a second end (62) of the pin shaft receives hydraulic pressure from the second opening of the inner housing cavity. Also disclosed is a hydraulic reversing valve (200) comprising the pre-pressing valve. The pre-pressing valve may reduce power loss, reduce the size of the valve body of the hydraulic reversing valve and reduce the cost thereof.
Inventors:
WANG WEI (CN)
Application Number:
PCT/CN2019/108042
Publication Date:
April 01, 2021
Filing Date:
September 26, 2019
Export Citation:
Assignee:
BOSCH REXROTH BEIJING HYDRAULIC CO LTD (CN)
International Classes:
F16K31/122
Foreign References:
| CN108488400A | 2018-09-04 | |||
| CN105971956A | 2016-09-28 | |||
| CN206513918U | 2017-09-22 | |||
| US6073904A | 2000-06-13 | |||
| JPS62220784A | 1987-09-28 | |||
| US5339857A | 1994-08-23 |
Attorney, Agent or Firm:
NTD UNIVATION INTELLECTUAL PROPERTY (CN)
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