Stem and disc seal construction for butterfly valves

Details Stem and disc seal construction for butterfly valves Stem and disc seal construction for butterfly valves

1987-06-26

1988-07-26

Chambers, A. Michael

Valves and valve actuation

Rotary valves

Butterfly

251214, F16K 1228

Patent

active

047595302

ABSTRACT:
A butterfly type valve has a closure disc with opposed trunnions or support stem portions for rotatably supporting the closure disc in a valve body which is bored to receive respective sets of circular disc type springs urging seal faces on a body liner into engagement with cooperating annular seal faces formed on an overmold resilient plastic layer on the closure disc. The closure disc outer layer is formed of PFA or PVDF type plastic and the body liner of PTFE type plastic, respectively to eliminate cold fusion when the closure disc is forcibly engaged with a seat surface formed by the liner. The closure disc layer includes a portion filling an undercut groove in the closure disc stems which is cooperable with a cylindrical collar formed on the liner and a backup seal to further seal the stem portions from exposure to the fluid flowing through the valve or the environment in which the valve is disposed.

REFERENCES:
patent: 3096071 (1963-07-01), Fisher
patent: 3778028 (1973-12-01), Graves et al.
patent: 3991974 (1976-11-01), Bonafous
patent: 4266754 (1981-05-01), Ninomiya et al.
patent: 4358086 (1982-11-01), Hiltebrand

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