Title:
FLUID CONTROL VALVE
Document Type and Number:
WIPO Patent Application WO/2008/029443
Kind Code:
A1
Abstract:
A fluid control valve having a valve body provided with a high-pressure path for
interconnecting a suction port and a sleeve in which a spool is assembled, a tank
path for interconnecting a discharge port and the sleeve, a lift lock poppet provided
between the sleeve and a cylinder port and capable of having an open state for interconnecting
the sleeve and the cylinder port, an operation liquid discharge path for interconnecting
a back pressure chamber provided inside the lift lock poppet and the sleeve, an
operation liquid delivery path located between the sleeve and the lift lock poppet,
a cylinder path located between the lift lock poppet and the cylinder port and
connected to the operation liquid delivery path when the lift lock poppet is in
the open state, and an interconnection path for interconnecting the operation
liquid discharge path and the operation liquid delivery path. The interconnection
path reduces a variation in the pressure in the operation liquid delivery path
immediately after the lift lock poppet is shifted to the open state. This prevents
the lift lock poppet from rapidly moving to an operation end and prevents occurrence
of large impact noise when the lift lock poppet collides with the operation end.
Inventors:
NISHIGUCHI, Hiroki (C/O SHIMADZU HYDRAULICS LTD. 1-8-1, Tukinowa Otsu-sh, Shiga 52, 5202152, JP)
Application Number:
JP2006/317481
Publication Date:
March 13, 2008
Filing Date:
September 04, 2006
Export Citation:
Assignee:
Shimadzu Corporation (1 Nishinokyo-Kuwabaracho, Nakagyo-ku Kyoto-sh, Kyoto 11, 6048511, JP)
株式会社 島津製作所 (〒11 京都府京都市中京区西ノ京桑原町１番地 Kyoto, 6048511, JP)
株式会社 島津製作所 (〒11 京都府京都市中京区西ノ京桑原町１番地 Kyoto, 6048511, JP)
International Classes:
F15B11/08
Attorney, Agent or Firm:
AKAZAWA, Kazuhiro (Rokkaku Bldg, 6F 617, Manjuya-cho, Karasuma-dori Rokkaku Agaru, Nakagyo-ku, Kyoto-sh, Kyoto 61, 6048161, JP)
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