البحث في مجموعات البراءات الوطنية والدولية

1. (WO2018038231) NEUTRAL VALVE, AND VALVE ASSEMBLY EQUIPPED WITH SAME

Pub. No.:    WO/2018/038231    International Application No.:    PCT/JP2017/030424
Publication Date: Fri Mar 02 00:59:59 CET 2018 International Filing Date: Fri Aug 25 01:59:59 CEST 2017
IPC: F16K 11/07
F15B 11/00
F16H 61/4069
F16H 61/439
Applicants: KAWASAKI JUKOGYO KABUSHIKI KAISHA
川崎重工業株式会社
Inventors: FUJII, Tomoyuki
藤井 智幸
Title: NEUTRAL VALVE, AND VALVE ASSEMBLY EQUIPPED WITH SAME
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.