F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
251/50
F16K 5/16 (2006.01)
Patent
CA 1267127
ABSTRACT OF THE DISCLOSURE A quarter-turn plug valve has an inverted and tapered frustoconical body cavity and plug. The valve body has a through-flow passage with ports opening into said body cavity. The tapered plug has a valve stem and a through-flow passage. The valve seats surround the ports and extend from the walls of the tapered valve cavity toward the plug. The plug, when seated in closed position, is in physical contact only with the annular tapered faces of the valve seats. The valve stem contains acme or square threads near the bottom to engage with a bonnet threaded at its lower end. The bonnet extends axially along the valve stem and has a projecting flange near its midpoint, which seats on a gasket placed between it and the valve body flange. When the plug is properly oriented in closed position, the adjustable bonnet is turned on the threads of the valve stem with the stem fixed until it seats on the valve body with the desired downward thrust. A bonnet flange is then bolted to the valve body to hold the bonnet and stem and plug assembly properly adjusted and seated in closed, no-flow position inside the valve cavity. The valve stem is square at the top, with the plane of one side of the square being in line with the opening of the flow-through passage. Therefore, a handle mounted on the valve stem will indicate whether the valve is in open-flow position or in closed, no- flow position.
597175
Borden Ladner Gervais Llp
Henry Vogt Machine Co.
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