A variable orifice spray valve including a valve body (42) having a spray discharge orifice (42A) formed therein. The spray valve further includes a liquid flow passage into the valve body, a deflector plate (45) in proximity to the spray discharge orifice (42A) onto which liquid discharged from the orifice is directed, a spray height adjuster (44) adjacent the orifice and movable relative to the deflector plate (45) into the liquid flow path from the orifice, and an adjustment mechanism (43) to adjust the position of the spray height adjuster (44) relative to the discharge orifice (42A).