Abstract: A solenoid operated exhaust bleed type pressure control valve assembly providing a proportional pressure control signal over the full range of solenoid operating current. A poppet valve member is connected to the solenoid armature and closes against a valve seat in the control signal port pressure chamber to prevent flow through the valve seat to the exhaust (bleed) ports. This results in very low or reduced leakage at minimum pressures. The poppet valve contacts a projection on a spool valve for effecting concurrent movement therewith for valving a supply pressure port in the control signal pressure chamber. In the normally closed version of the valve assembly, the poppet delays the spool opening of the inlet or supply port until solenoid current has reached about Five to Twenty Percent (5-20%) of maximum. In the normally open version, the spool is delayed in closing the supply inlet port until solenoid current reaches about Eighty to One Hundred Percent (80-100%) of maximum.

Abstract: An improved regulator valve 10 for controlling the purging of fuel vapors collected in a canister 12 and an evaporative emission control system into an intake system 18 of an internal combustion engine employs a solenoid valve assembly 40 with an armature 86 disposed outside of the coil 58 to operate with low friction. A spring 90 separating the armature 86 from the valve member 98 allows the spring 98 to absorb most of the magnetic and gravitational side loading.

Abstract: A valve assembly having solenoid valves mounted on a manifold or block for, upon energization, controlling flow in selected passages. A bus frame of overmolded bus strips has portions of the strips exposed for connection directly to the solenoids. A pressure switch capsule is received in a ported cavity in the manifold or block and located such that a snap disk on the pressure switch contacts exposed surfaces of end portions of two of the bus strips for completing a circuit responsive to sensed pressure in the block cavity.

Abstract: A variable force solenoid operated pressure control valve of the type having a force balanced spool moveably controlled energization of the solenoid for modulating the discharge pressure of the valve at its control outlet when the valve is supplied at its inlet with fluid of a supply pressure. The spool is moved to bleed fluid through an exhaust port to a sump for controlling the pressure supplied to the control outlet. The spool has a dashpot and piston in one end for providing hydraulic dampening of spool oscillations. In one embodiment a cylindrical piston is used and in an alternate arrangement a ball is employed in the dashpot.