Fluid flow valve stem

Claim 1

A flow control valve stem for a fluid or the like comprising: a sleeve having a first passage extending therethrough, a mouth at one end of said sleeve, and an internal annular valve seat on said first passage; a plunger mounted in said first passage for reciprocal movement and having a free end, an opposite end and a valve seal member interposed therebetween, said plunger further being reciprocally movable by manual movement of said free end between a normal closed position in which said valve seal member engages said annular valve seat to prevent the passage of fluid through said first passage, and an open position in which fluid can pass through said valve seat and said first passage; an end cap having inner and outer tubular portions defining an annular blind bore for receiving said opposite end of said sleeve in an interference fit for rigidly securing said end cap to the opposite end of said sleeve by a vacuum lock, said end cap further having a second passage extending therethrough in fluid communication with said first passage; and resilient means mounted in said first passage and interposed between said end cap and said plunger for biasing said plunger to said normal closed position.