Fluid handling – Destructible or deformable element controlled – Heat destructible or fusible
Patent
1979-12-03
1981-10-06
Weakley, Harold W.
Fluid handling
Destructible or deformable element controlled
Heat destructible or fusible
251174, F16K 1304
Patent
active
042929890
ABSTRACT:
A Fire Safe Seal for a valve having a metallic seat ring slidable in a cylindrical internal surface with an elastomer ring sealing between the seat ring and the internal surface. An elastomer seal ring or even a highly finished surface on the leading face effects a seal with the valve closure member. An emergency seal ring having a forwardly extending, sharp annular lip with an internal chamfer is engageable, when forced, over a complementary chamfer around the trailing end of the seat ring and into the clearance around the seat ring to seal it off. A spacer ring of a heat destructible material is interposed between the emergency seal ring and the seat ring to render the emergency ring inactive normally.
REFERENCES:
patent: 2929606 (1960-03-01), Kaiser
patent: 3241808 (1966-03-01), Allen
patent: 3346234 (1967-10-01), Allen
patent: 3990465 (1976-11-01), Allen
Cazzaniga Italo
Pasquinelli Ottorino
Grove Valve and Regulator Company
Stidham Melvin R.
Weakley Harold W.
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