| 摘要 |
A valve is disclosed, which provides its principal utility in oil field pumping operations, having a valve body with an interior quiet chamber. Ports are provided beneath the chamber, shown as holes in the side wall of the valve body. A pin extends downwardly in the quiet chamber, and a valve is provided having a long stem with a hollow bore proportioned for a sliding fit along the aligning pin, the valve terminating in a head having a seating portion. A seat is provided in the lower portion of the valve in open communication with a lower extension. In an alternative embodiment, a second seat is provided at a mid portion of the valve to mate with a chamfered seat in the lower portion of the quiet chamber. In addition, a stainless steel insert is provided on the face of the lower valve seat. The valve is preferably formed of a light weight, non-corrosive, relatively inert moldable plastic, such as that known as delrin. Optionally, a spring may be provided in coaxial biased relationship between the valve head and the upper portion of the body to urge the valve into a closed condition.
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