Valves and valve actuation – Mechanical movement actuator – Plural motions of valve
Patent
1989-12-04
1991-01-22
Walton, George L.
Valves and valve actuation
Mechanical movement actuator
Plural motions of valve
251217, 251339, 251351, F16R 3150, F16R 5100
Patent
active
049865021
ABSTRACT:
A drain plug for threaded engagement within a threaded drain opening of a pressurized system to prevent complete removal of the plug before release of any residual pressure within the system. An axially extending groove is formed in the threaded portion of an elongated shank of the plug and terminates in an unthreaded area of the shank adjacent to an enlarged head of the plug. An O-ring is compressed against the pressurized vessel or container when the plug is fully sealed in the threaded opening. The end of the groove adjacent the plug head beings to vent any residual pressure trapped within the pressurized system upon partial unloosening of the plug to relieve pressure while a sufficient number of threads on the inner end of the shank remain engaged within the threaded opening to prevent the plug from being blown out of the hole by any residual pressure. In an alternate embodiment, an axial hole is formed through the center of the shank and communicates with a cross hole to provide the venting for the plug.
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Nupro-Nupro Company, 4800 E. 345th St., Willoughby, OH 44094, Check and Relief Valves--pp. 1-8.
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