F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
251/45
F16K 41/00 (2006.01) F16K 5/06 (2006.01) F16K 41/02 (2006.01)
Patent
CA 1145316
ABSTRACT OF THE DISLCOSURE 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.
375078
Litton Industrial Products Inc.
Macrae & Co.
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