Abstract: A chemical injector valve connected to a source of water under pressure harnesses the venturi effect to entrain liquid chemicals into a water stream and employs a variable size pressure chamber to ensure that the flow rate and quantity of chemicals entrained remains constant even when the pressure of water entering the valve varies widely. An increase in incoming water pressure causes expansion of the variable size pressure chamber and a decrease in incoming water pressure causes contraction of the variable size pressure chamber. A slidably mounted piston is biased toward the variable size pressure chamber so that the size of the pressure chamber does not increase unless the accumulation of water in the chamber exceeds the bias acting on the piston. When the bias is exceeded, a shank of the piston moves toward a piston stop and the flow of water into the valve is throttled.

Abstract: A pressure washer frame is modified to include a hose reel and a gunvalve rack so that those items can be transported to a job site with the pressure washer. The hose reel is created by connecting a stop member to the conventional handle with a pair of brackets so that a hose can be coiled about the handle and held against slippage by the stop member. The rack for the gunvalve is created by adding a pair of longitudinally spaced cradles to the frame. The first cradle is added to the handle end of the frame and supports the pistol grip part of the gunvalve. The second cradle is added to the opposite end of the frame and supports the distal end of the gunvalve. A strap associated with the second cradle holds down the distal end.