There are two types of spray guns: normal pressure type and pressurized type. There are also pressure spray guns, Carlo spray guns, trigger spray guns, and automatic recovery spray guns.

    The spray gun works by using liquid or compressed air for rapid release as power. It includes a gun body and a gun head, and the gun body and the gun head are connected by a connecting mechanism. The gun head includes a nozzle, and a number of metal round steels are plug-welded inside the nozzle. The nozzle is made into a flat shape, which is convenient to replace and low in cost and can effectively prevent the tip from falling off and being worn.

    The nozzle is sprayed into the suction chamber at a high speed, and the pressure energy of the water is converted into kinetic energy to form a high-speed flow; the gas in the suction chamber is forcibly carried and mixed with it by the high-speed jet to form a gas-liquid mixed flow, which enters the diffuser so that the suction The pressure of the chamber decreases to form a vacuum. In the expansion section of the diffuser, the kinetic energy of the mixed jet is converted into pressure energy, the speed decreases, and the pressure increases, the gas is further compressed, and discharged out of the pump together with the water, and the gas and water are separated in the water tank, The gas is released into the atmosphere, and the water is recycled and reused by the water pump to achieve the purpose of vacuuming. The nozzle of the single-stage water jet pump can be a single-nozzle structure composed of a tapered nozzle, or a multi-nozzle structure with a plurality of orifices opened on an orifice plate.