These valves on the 300 Series have built in relief valves and the shim is adjustable, built in load check, an interchangeable hardened relief valve and built in load check. This valve is made to operate as a single acting cylinder or a uni directional hydraulic motor. The spool is a 3 way and 3 position spool. The 3 positions are power, exhaust and neutral. The “B” port is the power port and “A” port is plugged. It is spring centered to neutral position, that has a work port that is blocked in neutral. This valve is only usable in single spool housing only. Used in mobile and industrial operations.

The 400 Series has a built in relief valve and it is shim adaptable. It also also has a replaceable relief valve. This valve was made to control a double acting cylinder or reversible hydraulic motor. The spool is a 4 way and 3 position spool. It cannot change it to a 3 way valve and doesn’t have a load check valve assy. to stop reverse flow. The spring on the spool is centered to neutral position with cylinder ports blocked in neutral. This spool is available in single spool housing.

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