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 (JP)
SHIMIZU YUKI (JP)
INOUE MIKIO (JP)
SHIMIZU YUKI (JP)
INOUE MIKIO (JP)
Application Number:
PCT/JP2006/315179
Publication Date:
June 28, 2007
Filing Date:
July 31, 2006
Export Citation:
Assignee:
FUJIKIN KK (JP)
MIYAGAWA HIDEYUKI (JP)
SHIMIZU YUKI (JP)
INOUE MIKIO (JP)
MIYAGAWA HIDEYUKI (JP)
SHIMIZU YUKI (JP)
INOUE MIKIO (JP)
International Classes:
F16K35/00; F16K31/04; F16K31/122; F16K47/02
Foreign References:
| JPH05118465A | 1993-05-14 | |||
| JP2005325928A | 2005-11-24 | |||
| JP2003294165A | 2003-10-15 | |||
| JPS6435188A | 1989-02-06 | |||
| US5385328A | 1995-01-31 | |||
| JPS59152255U | 1984-10-12 | |||
| JPH0256984U | 1990-04-24 |
Attorney, Agent or Firm:
KIYOHARA, Yoshihiro (Kita-ku Osaka-sh, Osaka 04, JP)
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