Abstract: A wet plunger type solenoid primarily for use with hydraulic valves adapted for high pressure hydraulic fluid systems, the armature assembly being constructed so that a stainless steel armature tube can be employed to provide a strong plunger chamber that will withstand high pressures of the hydraulic fluid, and the armature tube and the associated yoke and stop pieces at the ends of the plunger chamber are arranged so that the non-magnetic tube does not cause an "air gap" in the magnetic fluid of the solenoid, thereby allowing the solenoid to operate at lower electrical loads and temperatures.

Abstract: A solenoid operated directional valve with detent means for retaining the spool of the valve in either of two selected positions, the detent means being operatively associated with the solenoid pins for holding one or the other of the pins in a selected position and thereby for retaining the spool in a selected position in the absence of any direct connection between the detent means and the spool, the detent means further being located out of the flow-passageways of the valve so as to preclude interference with fluid flow and being constructed and arranged to provide detent disengagement forces of uniform low limits and with no side loads applied on the spool, and to contain no loose parts and to have a near infinite life.

Abstract: Apparatus for assembling a complete modular valve system, including modules containing manifold blocks in which are mounted valves, such as flow controls, checks, pressure reducers and reliefs, the modules being sandwich mounted between a directional valve and a standard subplate for use in conjunction with hydraulic cylinders and the like, and the valves being arranged in the manifold blocks so that multiple-function modules can be provided.