Abstract: A washing machine including a boiler, a motor-driven pump controlled by a control device to pump warm water from the boiler to a spray gun through a water supply pipe, a check valve installed in the water supply pipe, a water return pipe for sending water from the water supply pipe back to the boiler, an unload valve for releasing pressure from the water supply pipe, a water volume detector connected to the water supply pipe between the unload valve and the spray gun to accumulate water from the water supply piping and being actuated when accumulated water volume drops below a predetermined value, a pressure detector mounted on the unload valve and actuated when the unload valve is opened, and a control device driven by the water volume detector to start the motor when the water volume detector is actuated, or driven by the pressure detector to turn off the motor when the pressure detector is actuated.

Abstract: A pilot mechanism for a pressure regulating valve having a relatively high pressure inlet, a relatively low pressure outlet and main valve pressure responsive means for operating the main valve to control the pressure of the fluid downstream of the main valve. The pilot mechanism comprises pilot valve means for supplying a loading fluid to one side of the main valve pressure responsive means. A normally closed bleed leakage path is provided in communication with the loading fluid supplied to the main valve pressure responsive means for directing loading fluid away from the main valve pressure responsive means when the bleed path is opened. Second pressure responsive means are provided responsive to the pressure of the fluid to be controlled for controlling the position of the pilot valve means to in turn control the flow of loading fluid supplied to the main valve pressure responsive means.

Abstract: An improved plug assembly for seating against a valve seat, the plug assembly being usable in a movable plug valve which controls the flow of the fluid through a conduit. The plug assembly includes an arm member, a plug member and biasing means. The arm member is adapted to be mounted for movement in the conduit and has an enlarged head. The plug member has a first face for sealingly engaging the valve seat and a rear face. The plug member further includes a recessed opening in one of the front and rear faces for receiving and retaining the enlarged head of the arm member for relative movement with respect thereto. The biasing means is disposed in the recessed opening and normally urges the enlarged arm head and the plug member into tight engagement with one another.

Abstract: An improved air horn is provided which includes a housing having an inlet for receiving a pressure medium to operate the horn and an outlet for the pressure medium. A first chamber is disposed between the inlet and outlet and receives the pressure medium from the inlet. A conventional sound-emitting horn is connected to the housing for receiving the pressure medium from the outlet, with the horn having a predetermined frequency. A closed resonating tube is connected to the other side of the housing, and a diaphragm is disposed between the first chamber and the resonating tube for oscillating movement in response to pressure changes in the first chamber and the resonating tube. A relatively small diaphragm having a natural frequency higher than the horn frequency is selected, as it is more economical and requires less energy to vibrate it.