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Patent Searching and Data


Title:
NEUTRAL VALVE, AND VALVE ASSEMBLY EQUIPPED WITH SAME
Document Type and Number:
WIPO Patent Application WO/2018/038231
Kind Code:
A1
Abstract:
A neutral valve according to the present invention comprises a spool that is inserted in a housing so as to be capable of movement in a prescribed direction and that moves between a neutral position at which a first port and a second port are connected via a valve passage, a first offset position which is on one side in the prescribed direction relative to the neutral position and at which the second port and the valve passage are disconnected, and a second offset position which is on the other side in the prescribed direction relative to the neutral position and at which the first port and the valve passage are disconnected. The spool has, on the outer peripheral section thereof, a first pressure receiving surface that is pressed to one side in the prescribed direction when subjected to fluid pressure from the first port, and a second pressure receiving surface that is pressed to the other side in the prescribed direction when subjected to fluid pressure from the second port. The housing has a first pressure chamber and a second pressure chamber that are at a distance from both the first port and the second port and to which the end parts of the spool in the prescribed direction are respectively positioned. The first pressure chamber and the second pressure chamber are connected to the valve passage via a communication passage.

Inventors:
FUJII TOMOYUKI
Application Number:
PCT/JP2017/030424
Publication Date:
March 01, 2018
Filing Date:
August 24, 2017
Export Citation:
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Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F16K11/07; F15B11/00; F16H61/4069; F16H61/439
Foreign References:
JPH1078148A1998-03-24
JPS56173264U1981-12-21
JPS57134403U1982-08-21
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
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