发明名称 |
ABNORMAL PRESSURE PREVENTION-VACUUM PREVENTION VALVE. |
摘要 |
<p>This invention relates to an abnormal pressure prevention-vacuum prevention valve which is disposed in a hydraulic circuit for driving an actuator of construction equipment or the like, converts the dynamic pressure occurring at a port on the actuator side to a static pressure, introduces this static pressure into a valve pressurizing chamber positioned on the opposite side to the port on the actuator side and prevents a pressure oil flowing into the port on the actuator side from flowing out to a tank port. This prevention valve includes a valve (11) for establishing/cutting off the communication between a port (3) on the actuator side formed inside a valve main body (1) of a control valve and a tank port (5) and a pressure introduction pipe (16) for introducing the pressure inside the port (3) on the actuator side into a valve pressurizing chamber (17) so as to bring the valve (11) into pressure contact with a seat (1a) of the valve main body (1). The valve (11) is equipped at its tip with a cylindrical protuberance (11a) disposed in such a manner as to project into the port (3) on the actuator side and the pressure introduction pipe (16) includes a tip portion (16a) which is disposed more inwardly than the tip surface (14a) of a spool (14) fitted into the valve (11).</p> |
申请公布号 |
EP0423343(A1) |
申请公布日期 |
1991.04.24 |
申请号 |
EP19890913244 |
申请日期 |
1989.11.30 |
申请人 |
KABUSHIKI KAISHA KOMATSU SEISAKUSHO |
发明人 |
AKASHI, M. KAWASAKI FACTORY OF K.K. KOMATSU |
分类号 |
F15B13/02;F16K17/04;F16K17/18;F16K17/196 |
主分类号 |
F15B13/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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