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A solenoid actuated pressure control valve includes a solenoid coil having a central passage extending axially through the coil. An armature is movable axially within the coil passage to be magnetically attracted to the pole piece when the coil is energized. Fluid pressure at a supply port of the va

A solenoid actuated pressure control valve includes a solenoid coil having a central passage extending axially through the coil. An armature is movable axially within the coil passage to be magnetically attracted to the pole piece when the coil is energized. Fluid pressure at a supply port of the valve biases the armature to its opposite end limit of movement when the coil is deenergized. Various forms of valving arrangements are disclosed, in one of which valve heads are located on the opposite ends of the armature to engage either of opposed valve seats dependent on whether the coil is energized or not. In other arrangements, the armature engages a push rod to unseat one valve upon energization of the coil while closing a seond valve. The one valve is biased to its closed position by supply port pressure when the coil is deenergized, the push rod opening the other valve. The valves operate to connect a control port to a sump port when the coil is deenergized and to connect the control port to the supply port upon energization of the coil. One form of valve employs a diaphragm to hydraulically isolate the coil, pole piece and armature from the controlled fluid.

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A solenoid actuated fluid pressure control valve comprising a housing having a central passage extending vertically downwardly from a first port adapted to be connected to a fluid sump and located at the upper end of said housing to a second port adapted to be connected to a source of fluid pressure

A solenoid actuated fluid pressure control valve comprising a housing having a central passage extending vertically downwardly from a first port adapted to be connected to a fluid sump and located at the upper end of said housing to a second port adapted to be connected to a source of fluid pressure and located adjacent the lower end of said housing, a solenoid coil mounted withn said housing intermediate the upper and lower ends thereof in coxial relationship with said central passage, an elongate tubular valve body sealingly seated in said central passage with the upper end of said valve body projecting above the lower end of said coil and the lower end of said body located above said second port, a flow passage extending through said valve body from a lower downwardly facing frusto conical valve seat opening into said central passage at the lower end of said body to an upper upwardly facing valve seat at the upper end of said body opening into said central passage at the upper end of said body, means defining a third port in said housing in constant fluid communication with said flow passage at a location between said upper valve seat and said lower valve seat, a ball located in said flow passage between and said lower valve seat and said second port operable when seated against said lower valve seat to block fluid communication between said second port and that portion of said flow passage above said lower valve seat, a solenoid armature received in said central passage between said upper valve seat and said first port and having means at its lower end operable when engaged with said upper valve seat to block fluid communication between said flow passage and that portion of said central passage above said upper valve seat, said armature being adapted to accommodate a substantially unrestricted flow of fluid past said armature through that portion of said central passage between said valve body and said first port, a push rod loosely slidably received in said flow passage having a lower end projecting through said lower valve seat into engagement with said ball and an upper end projecting through said upper valve seat into engagement with the lower end of said armature, the length of said push rod being such as to hold said armature clear of said upper valve seat when said ball is seated against said lower end seat and to hold said ball clear of said lower valve seat when said armature is engaged with said upper valve seat, said ball being normally maintained seated against said lower valve seat by fluid pressure of said source connected to said port and said armature being movable into engagement with said upper valve seat in response to energization of said solenoid coil.