Valve

Abstract

The invention is an improved valve having a valve body, a valve stem having a valve plug portion and a valve stem portion, and a valve guide having an aperture in which the valve stem portion is received for reciprocal movement of the valve stem longitudinally inside the valve body. A valve seat is supported in the valve body and includes a pair of spaced apart circular valve seat surfaces that each sealingly engage a separate surface of the valve plug portion;. A spring biases the valve plug portion into sealing engagement with the valve seat. The valve seat has a pair of sealing surfaces that are brought in sealing engagement with distinct surface portions of the valve stem to provide improved and redundant sealing function. The valve has improved longevity and reliability.

1 . An improved valve, comprising:
 (a) a valve body;   (b) a valve stem comprising a metal valve plug portion and a valve stem portion;   (c) a valve guide comprising an aperture in which the valve stem portion is received for reciprocal movement of the valve stem longitudinally inside the valve body;   (d) a metal valve seat supported in the valve body and comprising a pair of spaced apart circular valve seat surfaces that each sealingly engage a separate surface of the valve plug portion; and   (e) a spring biasing the valve plug portion into sealing engagement with the valve seat.   
     
     
         2 . An improved valve as claimed in  claim 1 , further comprising a cap secured to the end of the valve stem portion trapping the spring between the end cap and the valve guide. 
     
     
         3 . An improved valve as claimed in  claim 1 , wherein the contact surfaces of the valve plug portion are valve seat are outwardly facing frustoconical surfaces and the valve seat surfaces are corresponding inwardly facing frustoconical surfaces. 
     
     
         4 . An improved valve as claimed in  claim 1 , further comprising a contoured shoulder of the valve body adjacent the valve seat that matches the contour of the valve stem and it in contact engagement therewith when the valve plug portion is in contact engagement with the valve seat.