Gate valve with lubricated secondary seal

Details Gate valve with lubricated secondary seal Gate valve with lubricated secondary seal

2009-03-06

2011-11-15

Fristoe, Jr., John (Department: 3753)

Valves and valve actuation

Reciprocating valve

Gate

C251S355000

Reexamination Certificate

active

08056882

ABSTRACT:
A gate valve includes a pair of opposing housing members, a gate, primary sealing sleeves and a secondary sealing member. The primary sealing sleeves are disposed in each of the housing members. The gate is configured to slidably pass through a transverse gate chamber defined when the housing members are joined together. The secondary sealing member is secured between the housing members and includes at least one passage or aperture configured to allow lubricating fluid to be applied through at least one of the housing members through the secondary sealing member and onto the gate.

REFERENCES:
patent: 3050077 (1962-08-01), Wheatley
patent: 3071343 (1963-01-01), Milleville
patent: 3778030 (1973-12-01), Carlin
patent: 4340204 (1982-07-01), Herd
patent: 5150881 (1992-09-01), McKavanagh
patent: 5338006 (1994-08-01), McCutcheon et al.
patent: 5341835 (1994-08-01), Lanning, II
patent: 5890700 (1999-04-01), Clarkson et al.

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