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US 2004/0000347 A1Published application
Flow force compensating spool valve and hydraulic valve, pneumatic valve, three-way control valve, and four-way control valve using the same
AssigneesAgency for Defense Development, Hanwha Corporation
InventorsWeon Gyu Shin, Hyun Young Choi, Hyo Pil Shin, Eui Joon Moon, Jong Yeol Kim
Life of this patent
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Abstract
Disclosed is a flow force compensating spool valve having a flow force compensating protrusion ring at a supply channel of a sleeve on an outer circumference portion of a spool rod, and a hydraulic valve, a pneumatic valve, a three-way valve, and a four-way valve using the spool valve, in which the flow force can be compensated by a simple structure change of the spool without changing a structure of the sleeve.
Claims10
A spool valve comprising:
- a sleeve having a supply channel and a feedback channel;
- a spool having a plurality of spool lands connected to one another by a spool rod, wherein the channels are opened and closed by the spool which reciprocates in the sleeve toward the shaft direction;
- and
- a flow force compensating protrusion ring formed at the supply channel on the outer circumference portion of the spool rod.
1 more element
Dependencies are inferred from the claim text.