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Patent Searching and Data


Title:
WATER HAMMER-LESS VALVE
Document Type and Number:
WIPO Patent Application WO/2007/072602
Kind Code:
A1
Abstract:
[PROBLEMS] A water hammer-less valve in which a pneumatically operated valve automatically prevents a stem from rising when water hammer occurs, thereby opening of a flow path is limited. [MEANS FOR SOLVING PROBLEMS] The water hammer-less valve has the pneumatically operated valve in which a flow path is opened and closed by a valve body moving up and down by operation of a pneumatic actuator, and also has a limitation mechanism for limiting the rise of the valve body when water hammer occurs. The limitation mechanism has a stepping motor whose shaft is fixed to the upper part of the actuator; a vertically moving member connected to the rotating shaft, rising as the rotating shaft rotates in one direction, and lowering as the rotating shaft rotates in the opposite direction; a lower end detection member for detecting the fact that the vertically movable member descends to be in contact with the upper end of the stem; and a control device for rotating the stepping motor in one direction when supply of air to the actuator is started, rotating the stepping motor in the reverse direction when the air supply is stopped, and sends a stop signal to the stepping motor when detection is made by the lower end detection section.

Inventors:
MIYAGAWA, Hideyuki (3-2 Itachibori 2-chome, Nishi-ku, Osaka-sh, Osaka 12, 5500012, JP)
宮川 英行 (〒12 大阪府大阪市西区立売堀2丁目3番2号 株式会社フジキン内 Osaka, 5500012, JP)
SHIMIZU, Yuki (3-2 Itachibori 2-chome, Nishi-ku, Osaka-sh, Osaka 12, 5500012, JP)
Application Number:
JP2006/315179
Publication Date:
June 28, 2007
Filing Date:
July 31, 2006
Export Citation:
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Assignee:
KABUSHIKI KAISHA FUJIKIN (3-2 Itachibori 2-chome, Nishi-ku Osaka-sh, Osaka 12, 5500012, JP)
株式会社フジキン (〒12 大阪府大阪市西区立売堀2丁目3番2号 Osaka, 5500012, JP)
MIYAGAWA, Hideyuki (3-2 Itachibori 2-chome, Nishi-ku, Osaka-sh, Osaka 12, 5500012, JP)
宮川 英行 (〒12 大阪府大阪市西区立売堀2丁目3番2号 株式会社フジキン内 Osaka, 5500012, JP)
International Classes:
F16K35/00; F16K31/04; F16K31/122; F16K47/02
Foreign References:
JPH05118465A
JP2005325928A
JP2003294165A
JPS6435188A
US5385328A
JPS59152255U
JPH0256984U
Attorney, Agent or Firm:
KIYOHARA, Yoshihiro (1-3 Dojimahama 2-chome, Kita-ku Osaka-sh, Osaka 04, 5300004, JP)
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