| 摘要 |
A discharge valve including a tubular, valve seat and a valve guide disposed above the valve seat. The valve guide has a discharge passage plug and a guide rod that is affixed to, and projects downwardly from, the bottom of the plug. The valve guide also has an interiorly threaded, lifting sleeve that is affixed to, and projects upwardly from, the top of the plug. A piston is disposed between the valve seat and the valve guide. The piston has a conical, head portion for engaging the top of the valve seat, and a stem portion that is affixed to, and extends upwardly from, the head portion. The stem portion has a longitudinal socket within which the guide rod is slidably received. The stem portion also has a number of apertures that intersect the socket for providing pressure relief to the socket. A compressed spring is disposed between the valve guide and the head portion of the piston for normally retaining the head portion in engagement with the valve seat. An externally threaded, valve retainer is disposed above the valve guide for pressing the valve guide toward the valve seat.
|
