A pressure foam trigger spray gun is a tool used for cleaning, disinfecting, and applying foamy chemical products. Its core function is to control the spray pressure through a trigger device to evenly distribute the foamy cleaner or disinfectant to the target surface. The spray gun usually consists of a pressure tank, a liquid storage tank, and a nozzle, which can quickly convert liquid into foam, increase cleaning efficiency, and save the amount of detergent. Pressure foam trigger spray guns are widely used, especially in car cleaning, industrial equipment maintenance, food processing plant disinfection, and home cleaning. The characteristics of the foam enable it to better adhere to vertical surfaces, prolong the contact time between the detergent and the dirt, and thus improve the decontamination effect. The trigger design of the spray gun makes it easy for users to control the spray force, reduce the waste of chemicals, and improve the economy of use.