Invention Grant
- Patent Title: Four-way directional control valve
- Patent Title (中): 四通方向控制阀
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Application No.: US467323Application Date: 1999-12-20
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Publication No.: US6152178APublication Date: 2000-11-28
- Inventor: Hisatoshi Hirota , Katsumi Koyama
- Applicant: Hisatoshi Hirota , Katsumi Koyama
- Applicant Address: JPX Tokyo
- Assignee: TGK Co. Ltd.
- Current Assignee: TGK Co. Ltd.
- Current Assignee Address: JPX Tokyo
- Priority: JPX11-170391 19990617
- Main IPC: F16K11/07
- IPC: F16K11/07 ; F16K11/048 ; F16K31/06 ; F16K31/42 ; F25B41/04 ; F16K11/044
Abstract:
In a four-way directional control valve of simplified construction and reduced manufacturing costs, first and second hollow cylindrical valve elements are arranged coaxially. Adjacent to opposite ends of the valve elements, first and second valve seats and first and second valve closure elements are provided. First and second pressure-regulating chambers are arranged between separator walls of the valve elements and first and second partition walls associated to the first and second valve seats. A pilot valve can be switched between switching positions for introducing high-pressure fluid originating from a first pipe into the first or second pressure-regulating chamber via a common high-pressure passage, a high pressure introducing hole and two pilot holes, respectively, associated to the pressure-regulating chambers. The control valve can be switched into a state where the first pipe communicates with the fourth and the second pipe communicates with the third pipe and to another state where the first pipe communicates with the third pipe and the second pipe communicates with the fourth pipe.
Public/Granted literature
- US5641037A Rail lubrication apparatus Public/Granted day:1997-06-24
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