VALVE ACTUATOR - KITAMURA VALVE MFG CO LTD

Title:

VALVE ACTUATOR

Document Type and Number:

WIPO Patent Application WO/2007/069526

Kind Code:

A1

Abstract:

A valve actuator in which condensation is prevented. A piston (5) connected to a valve (1) is urged by a spring (16) in a predetermined direction. Also, the piston (5) is received in a cylinder (4) so as to be slidable in the opposite direction against the spring (16) by pressurized air sent from a pressurized air inlet (6a). When pressurized air inlets (4a, 6a) of the cylinder (4) and a pressurized air source (18) are being communicated with each other, a solenoid valve (11) closes a circulation tube (22) connected to air outlets (4b, 6b) of the cylinder (4). When the communication between the pressurized air inlet (4a, 6a) of the cylinder (4) and a pressurized air source (18) are shutoff, the circulation tube (22) is communicated to the pressurized air inlet (4a, 6a).

Inventors:

BABA AKIHISA (JP)
KUNIEDA WATARU (JP)

Application Number:

PCT/JP2006/324443

Publication Date:

June 21, 2007

Filing Date:

December 07, 2006

Export Citation:

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Assignee:

KITAMURA VALVE MFG CO LTD (JP)
BABA AKIHISA (JP)
KUNIEDA WATARU (JP)

International Classes:

F15B15/06; F15B11/064; F15B21/14; F16K31/163

Foreign References:

JPS63130677U	1988-08-26
JPH09100940A	1997-04-15
JPH0842511A	1996-02-13
JPH1122704A	1999-01-26

Other References: