Abstract: A reservoir is provided for a hydraulic dampening chamber at the end of a spool valve with a snap on cap having a labyrinth or baffled fluid entry passage formed in the closed end of the cap.

Abstract: A reservoir is provided for a hydraulic dampening chamber at the end of a spool valve with a snap on cap having a labyrinth or baffled fluid entry passage formed in the closed end of the cap.

Abstract: A thermal expansion valve for controlling flow of refrigerant from a high pressure (condenser) inlet to a low pressure (evaporator) outlet. The main valve is operated by pressure in a temperature sensing fluid filled capsule acting on a diaphragm connected to a valve operating rod. Upstream of the main valve, mounted on the same block is a solenoid operated shutoff valve. A first noise reducing restricting orifice is disposed in the high pressure inlet upstream of the shutoff valve. A second noise reducing restricting orifice is disposed in the shutoff valve which is preferably pilot operated.

Abstract: A method of reducing flow noise in a thermally responsive expansion valve of the type for controlling flow of a relatively high pressure refrigerant from a condenser applied to its inlet at a substantially reduced pressure for circulation through an evaporator and including a solenoid operated shut-off valve in the inlet of the expansion valve. A reduced diameter flow passage is formed in the inlet upstream of the shut-off valve and a micro-porous element disposed in the reduced diameter passage and is operative for substantially reducing flow noise. The micro-porous element preferably has passage of about forty to one hundred eighty microns.

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.