Valves and valve actuation – Valve – Materials
Patent
1988-08-17
1989-05-30
Chambers, A. Michael
Valves and valve actuation
Valve
Materials
251164, 251288, 137315, F16K 2500
Patent
active
048343404
ABSTRACT:
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 throughflow 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.
REFERENCES:
patent: 688298 (1901-04-01), Foss
patent: 845540 (1907-02-01), Ferguson et al.
patent: 1473210 (1923-05-01), Costello
patent: 2076841 (1937-12-01), Heggem
patent: 2182930 (1939-12-01), Nordstrom
patent: 2633326 (1953-03-01), Givens
patent: 2858097 (1958-04-01), Blomstran et al.
patent: 3429553 (1969-04-01), Smith
patent: 4239185 (1980-12-01), Lowe
Chambers A. Michael
Henry Vogt Machine Co.
Price William R.
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