| 摘要 |
<p>A gate valve (10) for use in oil field applications having a seal assembly (78) made up of an elastomeric case (80) and a spring (88) in the case having a V-shaped cross section. The spring has legs (90) that depend from one another, and free ends (94) of the legs that are contoured towards one another to define a rounded surface (96) on outer surfaces of the legs. The rounded surface reduces stress contact between the spring and the case, thereby prolonging seal assembly life. The seal assembly can be placed between a stem (20) in the valve and a gland packing (12). Other seal assembly locations include between a seat ring (32) and counterbore (34) in the valve body.</p> |
