초록 ▼

A hydraulic control valve has a spool slidably received in a bore of the valve body. The spool can be moved in opposite directions to control flow fluid to and from a pair of workports. A sensor assembly has a coupling attached to the spool and holds a permanent magnet. A Hall effect sensor produces

A hydraulic control valve has a spool slidably received in a bore of the valve body. The spool can be moved in opposite directions to control flow fluid to and from a pair of workports. A sensor assembly has a coupling attached to the spool and holds a permanent magnet. A Hall effect sensor produces an electrical signal indicating the position of the permanent magnet and thus the spool. A double acting spring assembly biases the coupling and spool with respect to the housing of the sensor when the spool moves in one direction, and biases the coupling and spool with respect to the valve body when the spool moves in the other direction.

대표청구항 ▼

[ We claim:] [1.] A hydraulic control valve comprising:a valve body having a bore with an axis, an inlet in communication with the bore and an outlet in communication with the bore;a spool has an end and is received in the bore to control the flow of fluid between the inlet and the outlet, the spool

[ We claim:] [1.] A hydraulic control valve comprising:a valve body having a bore with an axis, an inlet in communication with the bore and an outlet in communication with the bore;a spool has an end and is received in the bore to control the flow of fluid between the inlet and the outlet, the spool can be moved axially in either a first direction or a second direction within the bore;a sensor assembly including a housing, a coupling connected to the spool to move therewith, a permanent magnet attached to the coupling, and a magnetic sensor mounted adjacent to the permanent magnet for producing an electrical signal which varies in correspondence with changes in position of the permanent magnet; anda double acting spring assembly operatively coupled to bias the coupling and spool with respect to the housing when the spool moves in the first direction and to bias the coupling and spool with respect to the valve body when the spool moves in the second direction.