Fluid handling – Destructible or deformable element controlled – Heat destructible or fusible
Patent
1980-04-21
1981-06-16
Schwadron, Martin P.
Fluid handling
Destructible or deformable element controlled
Heat destructible or fusible
251214, 277 26, 277DIG6, F16K 4100, F15J 1554
Patent
active
042731488
ABSTRACT:
In a ball valve including a cylindrical housing having a flow passage, a rotatable ball for selectively blocking the flow passage, and an external actuating handle, a fire safe stem seal comprising a stem having a selected diameter with a larger diametered shoulder portion on one end which is keyed for engaging the ball, and an opposite end for engagement with the actuating handle, the housing having a stem bore for matingly receiving the stem therethrough within a selected tolerance, a first interior step concentric with the stem bore and selectively sized to accommodate the stem shoulder, a second smaller selectively sized interior step concentric with the stem bore having a selected axial depth, a deformable heat-resistance second seal ring having an axial thickness substantially greater than the axial depth of the second step for engagement with the housing in the second step, a heat-destructible primary seal and bearing ring for engagement with the housing and the heat-resistant ring in the first step, and means to draw the stem shoulder against the heat-destructible primary ring in the first step which thereby compacts the heat-resistant ring in the second step and into the tolerance to effectively functionally lock the heat-resistant ring in a desired position around the stem.
REFERENCES:
patent: 3319647 (1967-05-01), Morain
patent: 3472254 (1969-10-01), Reed, Jr. et al.
patent: 3540740 (1970-11-01), Smith
patent: 3567176 (1968-12-01), Johnson
patent: 3586289 (1971-06-01), Priese
patent: 3630483 (1971-12-01), Canalizo
patent: 4006681 (1977-02-01), Gaillard
patent: 4105040 (1977-06-01), Chester
patent: 4157835 (1979-06-01), Kahle et al.
patent: 4190257 (1980-02-01), Schnitzler
Koenig, III C. Frederick
Litton Industrial Products Inc.
Schwadron Martin P.
Walton G. L.
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