High-pressure reciprocating pump

For positive displacement pumps, the inlet and outlet valves must be opened before starting up to prevent pressure buildup!

Open the outlet return valve by 2-3 threads, start the motor (the main operator with variable frequency control is used to apply load), and gradually close the return valve until the pressure is normal. Then open the pump outlet valve and close the pump outlet return valve completely; use variable frequency control to adjust the water injection volume

What was said upstairs is to open the outlet before turning on the device, right?

No, it won’t work if the check valve fails

High-pressure pumps belong to the category of positive displacement pumps, and they achieve the transfer of liquid by means of periodic changes in the volume within their working chamber； The mechanical energy of the prime mover is directly converted into the pressure energy of the liquid being transported by the pump ； The capacity of the pump depends only on the change in the volume of the working chamber and the number of times this change occurs per unit time; theoretically, it is independent of the discharge pressure. A reciprocating pump induces periodic changes in the volume of its working chamber by means of the reciprocating motion of a piston within the chamber (or through the periodic elastic deformation of flexible elements such as diaphragms or bellows within the working chamber). Structurally, the working chamber of a reciprocating pump is separated from the outside world by sealing devices, and it communicates with or is closed off from the pipelines through pump valves (suction valve and discharge valve).

The main activation is still achieved using the return line. Normally, those with a return valve have their outlet closed. What is meant by opening the outlet upstairs is to first open the check valve, so as to avoid the difficulty in operating the high-pressure outlet valve when high pressure is reached, as it is too heavy to handle.