Three-way control valve

Claim 1

A three-way valve comprising: a lower body member including a central axis, a first end, an annular first recess situated on said first end; first passage means for communicating fluid to said first recess; an axially located annular second recess partially extending through said lower body member, having an opening situated opposite to said first end and having a bottom seat situated opposite said opening, said second recess forming in cooperation with other elements of said lower body member a cylindrical axially located upraised boss, said second recess intersecting said first passage means, to provide fluid communication therebetween; a central stepped bore having an enlarged bore terminating a said first end, and a narrow bore extending through said boss; second passage means isolated from said first passage means and connected to said enlarged bore for transporting fluid from said enlarged bore out of said lower body member and wherein; the surface area of first end between said first recess and said central stepped bore defines an upper valve seat; a lower valve seat centrally located about said central axis and situated on the lower body member opposite from said first end; including a central opening therethrough; a plunger having one end slidably and fluid tightly engaging the walls of said narrow bore, and having another end extending beyond said lower valve seat; lower valve means attached to said another end of said plunger and movable therewith for seating upon said lower valve seat and for selectively opening and sealing said central opening; including a pre-load spacer situated about said plunger and extending through said central seat opening into said annular recess; spring means adapted to fit about said boss for biasing said lower valve means apart from said lower body member; upper valve means, situated above and movable with said plunger for selectively sealing upon said upper valve seat.