The pressure test pump is mainly used as sealing equipment for various pressure vessels and equipment (e.g. chemical containers, pump housings, valves and pipes) for pressure testing. Therefore, its biggest feature is that the inflation pressure is usually very high. Pressure pumps can reach hundreds of atmospheres, and ultra-high pressure test pumps can reach tens of thousands of atmospheres, while the flow rate is generally small, mostly less than m3/h. However, the output flow is small. Speed will not increase the time required for the pressure test because the container test time is small. The pressure test cannot be completed until the pump for the pressure test is filled. Typically, the pressure test process requires the container to be filled with liquid first and then discharged.connection to the pump outlet for pressure test to use the liquid for uniform transmission. The principle of force is used, so that when the pressure test pump outlet reaches a certain pressure value, the pressure inside the container. act accordingly, thereby achieving the purpose of pressure checking.

The working fluid of the pump for spraying is usually water, but it can also be pure mineral oil. There are usually two main types of pumps for pressure testing: manual and electric. Due to the high inflation pressure, hand pumps for suction are usually single-acting piston piston pumps. It mainly consists of pump body, plunger, handle and drain valve.

The basic design of the electric suction pump is roughly the same as the manual suction pump. The pump cylinder consists of 4 single-acting pistons. Part of the transmission relies on an electric motor that drives the worm gearbox, and an eccentric wheel on the worm transmission shaft drives the plunger back and forth.