other end 42 into an end member 44 which slides within valve housing part 24 end member 44 includes a central bore 45 and a rear end face 46 having an annular internal groove 48 formed in it a helical spring 50 surrounds stem 34 and fits into end member groove 48 at one end thereof and into valve housing part groove 28 at its other end to bias the sliding movement of end member 44 and connected stem 34 relative to housing 14 an o ring 51 circumscribes stem 34 and is located restrictively between housing shoulder 22 and end edge 30 in compressive contact with the stem and the side wall of housing bore 18 valve housing part 24 also includes oppositely protruding pins 52 a shut of actuator or lever 54 is pivotally fitted about pins 52 at lever openings 56 lever 54 includes a slotted wall 58 located forwardly of openings 56 and in contact with end member 44 a conduit 62 extends through lever wall 58 and is fitted within valve stem bore 38 to provide flow communication between sprayer 12 and a nozzle 64 valve assembly 10 operates as follows with lever 54 in the closed position shown in fig4 an operator pushes the lever handle section 60 in the direction of arrow 66 causing lever wall 58 to push end member 44 and valve stem 34 rearwardly towards conduit 16 and the compression of spring 50 this causes valve stem transverse openings 40 to be moved with the valve stem beyond or rearwardly of o ring 51 this positioning of openings 40 allows fluid under pressure from sprayer tank 12 to flow around stem head 36 through stem openings 40 and 38 to conduit 62 and out through nozzle 64 as shown.