Electricity: conductors and insulators – With fluids or vacuum – With fluid-condition responsive and/or indicating means
Patent
1979-10-09
1981-06-16
Askin, Laramie E.
Electricity: conductors and insulators
With fluids or vacuum
With fluid-condition responsive and/or indicating means
137320, 174 19, 251128, 251291, H02G 1522
Patent
active
042739519
ABSTRACT:
A conventional pothead-tank combination for an oil-filled electric cable is modified to replace the usual manually operable venting valve within the tank and on the pothead by a relief valve installed to close under pressure of the oil and is further modified to add a manually operable gate valve on the tank wall with the valve passageway aligned with the relief valve. A venting tool is provided, which comprises a swivel mounting unit which may be secured to the gate valve, a venting tube which is slidably mounted on the mounting unit and which has an inner end which may be secured to the relief valve, a housing having a cavity and secured to the other end of the venting tube and having a sampling valve thereon, and a valve opening rod extending from exteriorly of said housing through the interior of the tube to the end thereof remote from the housing, said rod being movable longitudinally for engaging and opening the control member of the relief valve and thereby venting fluids including accumulated gases from the pothead.
REFERENCES:
patent: 315652 (1885-04-01), Moss
patent: 706884 (1902-08-01), Beebe
patent: 915422 (1909-03-01), Ewart
patent: 1683489 (1928-09-01), Rice
patent: 1919935 (1933-07-01), Eby
patent: 2187838 (1940-01-01), Penick et al.
patent: 2299814 (1942-10-01), Gale et al.
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