Ball valve

Details Ball valve Ball valve

2007-07-17

2007-07-17

Bastianelli, John (Department: 3753)

Valves and valve actuation

With means to increase head and seat contact pressure

Seat pressed to valve

C251S180000, C267S162000

Reexamination Certificate

active

11131188

ABSTRACT:
A ball valve for refrigerating system includes a valve body, a valve seat that fits into the valve body by a screw thread, a valve ball accommodated within the valve body, two plastic sealing elements on both sides of the valve ball, a valve rod connected to the valve ball, and a valve cap on said valve rod. One of the two sealing elements is a first sealing element which is provided with a suitable spring assembly on its periphery. The spring assembly includes at least two springs with ladder-shaped longitudinal sections that are reverse-superimposed. The inside of first sealing element fits well with the surface of said valve ball, while its outside functions as a supporting surface and an acting surface for said spring assembly. The resulting configuration provides a ball valve with a desirable sealing effect.

REFERENCES:
patent: 3830693 (1974-08-01), Beser et al.
patent: 4566482 (1986-01-01), Stunkard
patent: 4718444 (1988-01-01), Boelte
patent: 4744572 (1988-05-01), Sahba et al.
patent: 5857663 (1999-01-01), Evans et al.
patent: 5868378 (1999-02-01), McMahon et al.
patent: 6193213 (2001-02-01), Stearns et al.
patent: 6488261 (2002-12-01), Lee
patent: 6499720 (2002-12-01), Lee

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