Shut-off valve for a sprayer

A shut-off valve for a sprayer, said valve comprising a housing having an inlet adapted for flow communication with a fluid source, said housing including an internal bore in flow communication with said inlet, a valve stem slidably positioned within said housing bore between open and closed position, said stem including a longitudinal bore in flow communication with an outlet at one end of the stem, a transverse opening in said stem into said longitudinal bore therein to provide flow communication between said housing bore and said stem longitudinal bore, and an annular sealing means positioned about said stem and contacting the stem and said housing for sealing the stem and housing against fluid flow therebetween at both open and closed positions of said stem, said sealing means when said stem is in its closed position for preventing fluid flow through said stem transverse opening, said sealing means when said stem is in its open position being spaced from said stem transverse opening for allowing fluid flow through said opening and stem bore to said stem outlet, and actuation means for urging said stem into a selected one of its said closed and open positions.