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US 6,267,140 B1Granted
Directional control valve having position detecting function
AssigneeSMC Corporation
InventorsBunya Hayashi, Makoto Ishikawa
Life of this patent
Estimating the term…
Abstract
A directional control valve capable of detecting the operating positions over the whole stroke of the valve member. The control valve includes a detection head having a magnetic scale including a magnetic portion and a non-magnetic portion installed on an end of a spool, and a magnetic sensor for reading the magnetic scale installed at a predetermined position opposite to the magnetic scale in a casing.
Claims7
A directional control valve having a position detecting function, comprising:
- a plurality of ports;
- a valve hole to which each of said ports is opened;
- a casing having said ports and said valve hole;
- a valve member for changing over fluid passages, said valve member being slidably received in said valve hole;
- driving means for driving said valve member;
- a detection head which has a magnetic scale formed so as to have a length corresponding to the whole stroke of said valve member by alternately disposing magnetic portions and non-magnetic portions, and which is displaced in synchronization with said valve member;
- and
- a magnetic sensor for reading the magnetic scale of said detection head, said magnetic sensor being disposed at that portion in the casing corresponding to said detection head.
5 more elements
Dependencies are inferred from the claim text.