Abstract: The expansion valve has a valve lifter which has an axial capillary bore, a shoulder which abuts the membrane and a tapered end which passes through the membrane with clearance forming a gap. A plunger whose movement is controlled by a magnetic coil is used to close and open the capillary bore.

Abstract: A thermostatic expansion valve assembly, particularly for a refrigerant cycle which includes a compressor, a condensor and an evaporator, operates in response to suction gas of the cycle and the valve assembly includes a housing defining a suction line for passage of the suction gas through the valve assembly. A valve tappet is acted upon by the suction gas for actuation of the valve assembly and a control member responsive to pressure and temperature receives the upper end of the valve tappet, with the suction gas acting on the valve tappet through the control member. The control member is formed in a cup-shaped configuration opening toward the suction line and includes a rim region projecting into the suction line and a circumferential region having a greater wall thickness than the rim region. An annular shoulder is formed on the control member and a cover plate is provided for the valve housing.

Abstract: A control valve particularly suitable for service in mechanical refrigeration systems has a spherical valve body permanently engaging an annular seal and is operated by turning the valve body about an axis perpendicular to the direction of fluid flow through the central opening in the valve seat. A circumferentially flaring notch in the outer circumference of the valve member by-passes the valve seat in the open angular position of the valve member and communicates only with the inlet or the outlet of the valve in the closed valve position.