US 6,637,452 B1 · Valve with self-cleaning trim

Abstract

The seal assembly is disclosed for use with a valve having a trim cage with an inner surface extending along in axis and a plug sized to fit inside the trim cage inner surface, wherein the plug is adapted to move along the axis thereof. A seal ring is attached to an upstream portion of the cage to effectuate a seal with the plug. The plug is equipped with a wiper seal that cleans or otherwise removes debris from the seating surface of the seal ring, an interior surface of the seal ring and an interior surface of the cage during both the opening and the closing of the valve. Thus, the valve is self-cleaning. Further, the wiper seal delays throttling action through the valve until the plug has moved a substantial distance away from the seating surface of the seal ring which reduces high pressure abrasive flow against the seating surface of the seal ring to reduce wear on the trim set.

Claims22

Dependent claims

A valve comprising:

a cage defining a bore extending along an axis,
a plug sized to fit inside the bore and adapted for slidable movement along the bore axis between closed and throttle positions, the plug comprising a proximal end connected to a stem and a distal end, the plug further comprising a seat disposed between the proximal and distal ends thereof,
a seal ring disposed between the distal end of the plug and the cage when the plug is in the closed position, the seal ring comprising a seating surface for engaging the seat of the plug when the plug is in the closed position
the plug further comprising a wiper seal disposed between the seat and distal end thereof, the wiper seal comprising an outside surface adapted to engage the bore and the seating surface of the sealing ring as the plug is moved between the closed and throttle positions.

1 more element

Dependencies are inferred from the claim text.

Valve with self-cleaning trim

Life of this patent

Valve with self-cleaning trim

Life of this patent

Abstract

Claims22