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Title:
PILOT-OPERATED CHECK VALVE AND HYDRAULIC CIRCUIT FOR ELEVATOR USING THE SAME
Document Type and Number:
Japanese Patent JP2004225877
Kind Code:
A
Abstract:

To provide a pilot-operated check valve that can structurally simplify reliable connection between a spool and a check valve of the pilot-operated check valve and maintain the function of the check valve even if the connection is released.

The pilot-operated check valve has the spool slidable in a bore made in a valve body, and the check valve attached to the spool; and closes the check valve when operated under a pilot pressure on one end face of the spool, and opens the check valve when operated under a pilot pressure on the other end face of the spool to lead pressure oil in one direction and another direction. In the pilot-operated check valve, an intermediate portion of a projecting check valve stem of the check valve is supported by the valve body, an end of the check valve stem is inserted in a check valve stem hole made in the other end face of the spool, and a pin is inserted in a connecting bore made just across the axis of the check valve stem to provide connection to the spool.


Inventors:
HASEGAWA KISAKU
HASEGAWA FUMINORI
NUKADA TAKAO
Application Number:
JP2003000017925
Publication Date:
August 12, 2004
Filing Date:
January 27, 2003
Export Citation:
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Assignee:
OIL DRIVE KOGYO KK
International Classes:
B66B9/04; F15B11/17; F15B15/14; F16K15/06; F16K31/42; (IPC1-7): F16K31/42; B66B9/04; F15B11/17; F15B15/14; F16K15/06
Attorney, Agent or Firm:
橋爪 良彦



 
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