Ball valve having one-piece packing

Details Ball valve having one-piece packing Ball valve having one-piece packing

1996-08-08

1998-03-24

Fox, John

Valves and valve actuation

Rotary valves

Ball valve

25131505, F16K 506

Patent

active

057304203

ABSTRACT:
A ball valve has a body with a cylindrical bore extending axially inwardly from the exterior of the body and defining a valve chamber. Inlet and outlet passages extend from the exterior of the body inwardly to the chamber. A ball valve member is disposed within the chamber and has an operating stem extending axially within the chamber to a position exterior of the body. A mass of packing material surrounds said ball valve member and substantially fills a portion of the chamber. The packing material initially has a smooth cylindrical outer configuration which matches the cylindrical surface configuration of the chamber. The body further includes a plurality of splines extending axially along the interior surface of the chamber. A flat washer and a packing ring are located around the operating stem of the ball the valve member, and a packing nut applies a bias force through the washer to the packing. When the biasing force is applied against the packing, the packing ring drives against the packing and the packing material within the chamber cold-flows into the splines in the body to prevent rotational displacement of the packing material in said chamber and to reduce leak paths between the mass of packing material and the chamber.

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