Ball valve with retractable seals and method of replacement...

Details Ball valve with retractable seals and method of replacement... Ball valve with retractable seals and method of replacement...

2005-09-06

2005-09-06

Look, Edward K. (Department: 3751)

Valves and valve actuation

With means to increase head and seat contact pressure

With positive reduction

C251S174000, C251S315120, C137S315210

Reexamination Certificate

active

06938876

ABSTRACT:
A ball value has a valve body defining a cavity, a ball closing component disposed within the cavity through a cavity opening, a cover, and seal assemblies having seating rings with seals disposed engaging both sides of the ball closing component. The seating rings slide in recesses of the valve body into and out of engagement with the ball closing component. The seating rings have flange with seals each engaging a side of the corresponding recess. A closing ring is screwed into the cavity to engage the seating rings. The flange of the seating ring defines a working chamber with the recess and the closing ring. The working chamber is communicated with a pressurized medium source and the working chamber is pressurized to displace the seating rings from the ball closing component to allow seal replacement.

REFERENCES:
patent: 3195560 (1965-07-01), Pofit
patent: 3580539 (1971-05-01), Van Scoy
patent: 4273152 (1981-06-01), Freeman
patent: 2 213 564 (1989-08-01), None

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