Patent ID: 6868684

Claim:
A block valve including a body and power element comprising a diaphragm mounted a domed head and a support cup on the valve body, a charge located within a head chamber defined by the domed head and one surface of the diaphragm, the support cup and another surface of the diaphragm defining a diaphragm chamber with the body of the expansion valve, a valve stem extending from the diaphragm through a bore in the valve body to the valve element modulating a valve orifice between a first port in the valve body and a second port in the valve body; a return passage through the valve body from the third port to a forth port, and in fluid communication with the diaphragm chamber; a refrigerant tube received in one of said port in said valve body and having a fluid-tight seal therewith, said refrigerant tube including a annular bead extending around the exterior of the tube in a direction transverse to the axis of the tube, said one port defined by the axis bore, and a first counterbore co-axial with said bore and formed inwardly from a surface of the body, said bore and first counterbore defining an inner shoulder, said refrigerant tube being received in said bore with said being closely received within said first counterbore and engaging said inner shoulder uniformly around the circumference of the tube; a deformed portion of said valve body surrounding the opening to said bore on said surface in forced engagement whit said bead without an external fastener so as to secure the tube to the valve body in fluid-tight relation therewith.