Importance

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Abstract

A large manually operated leak-proof corrosion-proof low-cost shut-off or stop valve for handling high pressure refrigerant liquids and/or gases comprises a valve body formed of two sheet metal hemispheres welded to the periphery of a circular metal valve plate having a fluid passage therethrough and hollow cylindrical metal tubes welded to the hemispheres along the edges of circular holes cut in the hemispheres. One tube on each hemisphere serves for fluid flow. Another internally and externally threaded tube on one hemisphere serves as a valve sleeve through which a rotatable and axially shiftable externally threaded valve spindle extends. The inner end of the valve spindle is secured to a valve disc which releasably engages a valve seat around the fluid flow passage in the valve plate. The outer end of the valve spindle is secured to the hub of a hand-wheel which is rotatable to open and close the valve. A hollow internally threaded bonnet is screwed on to the externally threaded outer end of the valve sleeve and entraps sealing materials so as to form a seal between the valve spindle and the valve sleeve and also entraps O-rings between the valve spindle and the bonnet. Unscrewing of the bonnet affords access to the sealing materials and O-ring and, as the bonnet moves axially, it also axially shifts the hand-wheel off of the outer end of the valve spindle.

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First Claim