SERVO VALVE

WIPO Patent Application WO/2010/016314

A1

Provided is a servo valve, which is facilitated in relative position adjustment between a nozzle and a flapper and simplified in the constitution of a valve member drive circuit so that the servo valve can be inexpensively manufactured.  The servo valve (1) comprises a spool (5) made reciprocally movable, a first chamber (7) and a second chamber (9) for pushing the spool (5) oppositely of each other by hydraulic pressures, and a spool drive circuit (3) for feeding oil to the first chamber (7) and the second chamber (9) and for adjusting the pressure of an oil thrower to be fed, thereby reciprocating the spool (5).  The spool drive circuit (3) keeps the fluid pressure of the first chamber (7) at a substantially constant level, and includes a nozzle flapper mechanism (27) at the oil exit from the second chamber (9) for adjusting the fluid pressure of the second chamber (9).

JP3574087

Hydraulic system with shadow poppet valve

HAYASHI TOSHIKAZU (JP)
YUGE ATSUSHI (JP)
UCHIDA MICHIYA (JP)
KUGA MAKOTO (JP)
TSURUTANI MINOBU (JP)
OGUSHI TAITO (JP)

PCT/JP2009/059859

February 11, 2010

May 29, 2009

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MITSUBISHI HEAVY IND LTD (JP)
HAYASHI TOSHIKAZU (JP)
YUGE ATSUSHI (JP)
UCHIDA MICHIYA (JP)
KUGA MAKOTO (JP)
TSURUTANI MINOBU (JP)
OGUSHI TAITO (JP)

F15B13/043

JPS483270B1	1973-01-30
JPH0754672A	1995-02-28
JPS6139111A	1986-02-25
JP2001082411A	2001-03-27
JPH06109158A	1994-04-19

See also references of EP 2309135A4
None

FUJITA, Takaharu et al. (JP)
Takaharu Fujita (JP)

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