Title:
REVERSING VALVE FOR HYDRAULIC PISTON PUMP
Document Type and Number:
WIPO Patent Application WO/2019/024428
Kind Code:
A1
Abstract:
A reversing valve for a hydraulic piston pump, which is composed of a pilot valve (10) and a main valve (20); the pilot valve (10) comprises a pilot valve seat (13), a hollow valve core (12), and a slide shaft (17); the main valve (20) comprises an upper valve seat (23), a lower valve seat (23a) and a main valve core (22); when the hollow valve core (12) is in a lower position, a control flow passage (34) is connected to a spent liquid flow passage (33), the main valve core (22) is in a lower position, and power liquid supplied by the main valve (20) causes a power piston (53) to ascend; when the hollow valve core (12) is in an upper position, power fluid controls the main valve core (22) to set at an upper portion, and power liquid supplied by the pilot valve (10) causes the power piston (53) to descend; initial movement of the hollow valve core (12) is provided by the power piston (53) actuating the slide shaft (17), and then the hollow valve core (12) is pushed by hydraulic pressure to a reversing position.
Inventors:
CUI NAILIN (CN)
Application Number:
PCT/CN2018/000217
Publication Date:
February 07, 2019
Filing Date:
June 07, 2018
Export Citation:
Assignee:
CUI NAILIN (CN)
International Classes:
F04B49/22; F04B9/103; F04B53/10
Foreign References:
| CN107676237A | 2018-02-09 | |||
| CN103423135A | 2013-12-04 | |||
| CN206668524U | 2017-11-24 | |||
| US20100143166A1 | 2010-06-10 |
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