Stem seal pressure telltale
AssigneeCooper Cameron Corporation
InventorsDavid R. Mefford, Paul M. Gutmann, Daryl L. Ard
Life of this patent
Estimating the term…
Abstract
A visual signal of pressure between valve stem seals is given by a rising ring, which moves upwardly with the upper stem seal when there is pressure between the stem seals. The rising ring is held to the stem or valve body around the stem by a retaining ring. The rising ring, in its up position, precludes removal of the retaining ring.
Claims17
A telltale system to provide a visual signal of pressure in a valve body having a valve stem, comprising:
- at least one seal movably mounted on said valve stem and movable in response to pressure reaching it from the body;
- an indicating member movably mounted in the body and displaceable by said seal so that at least a portion of said indicating member extends from the body;
- a travel stop to limit the movement of said indicating member outwardly from the body;
- means for allowing insertion and removal of said travel stop only when said indicating member does not extend from the body.
A telltale system to provide a visual signal of pressure in a body, comprising:
- at least one seal movably mounted to said body and movable in response to pressure reaching it from the body;
- an indicating member movably mounted in the body and displaceable by said seal so that at least a portion of said indicating member extends from the body;
- a travel stop to limit the movement of said indicating member outwardly from the body;
- said travel stop is insertable and removable only when said indicating member does not extend from the body;
- said travel stop further comprises a ring, which is disposed in a groove;
- said indicating member when displaced by said seal in a direction out of the body, encircles said ring, precluding its removal from said groove.
A telltale system to provide a visual signal of pressure in a body, comprising:
- at least one seal movably mounted to said body and movable in response to pressure reaching it from the body;
- an indicating member movably mounted in the body and displaceable by said seal so that at least a portion of said indicating member extends from the body;
- a travel stop to limit the movement of said indicating member outwardly from the body;
- said seal and said indicating member are movably mounted around a valve stem in the body;
- said travel stop is secured to a groove located on the stem.
A telltale system to provide a visual signal of pressure in a body, comprising:
- at least one seal movably mounted to said body and movable in response to pressure reaching it from the body;
- an indicating member movably mounted in the body and displaceable by said seal so that at least a portion of said indicating member extends from the body;
- a travel stop to limit the movement of said indicating member outwardly from the body;
- said seal and said indicating member are movably mounted around a valve stem in the body;
- said travel stop is secured to a groove located on the body.
A leakage indicating system for a valve stem, comprising:
- a valve body having a valve stem extending out of an opening thereof;
- at least one seal movably mounted around said stem;
- a pressure indicator movably mounted for tandem movement with said seal, whereupon pressure acting on said seal, at least a portion of said pressure indicator extends from said body.
Dependencies are inferred from the claim text.