Fluid handling – Processes – Affecting flow by the addition of material or energy
Patent
1986-03-05
1987-03-24
Weakley, Harold W.
Fluid handling
Processes
Affecting flow by the addition of material or energy
137 67, 137 74, 251308, 251317, F17D 116
Patent
active
046517634
ABSTRACT:
A means and method for assuring a tight sealing closure of a valve in a high temperature condition, such as fire, is provided by an expendable link on the downstream side of the valve stem and an intumescent material and piston on the upstream side of the valve stem so that, at an elevated temperature condition, the expendable link gives way to create a tolerance allowing the piston driven by the expanding intumescent material to shift the valve closure element in the direction of the valve seat to accommodate for any deterioration of the valve seal.
REFERENCES:
patent: 3666234 (1972-05-01), Scavamucci
Scobie William B.
Wagberg Michael L.
Keystone International Inc.
Weakley Harold W.
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