As we all know, the key metering pump is composed of three parts: driving force, fluid transport and adjustment operation. The driving force drives the equipment through the mechanical equipment linkage system to push the fluid transport diaphragm to complete repeated movement, and the diaphragm (piston rod) in the front self-induced electromotive force at two strokes will be sucked into the transport fluid and the fluid will be discharged out of the pump impeller in the second half cycle; Therefore, changing the number of repeated movements of the four strokes or the length of the four strokes of each repeated movement can achieve the goal of adjusting the fluid transport capacity. The high precision machining accuracy ensures the output of each pump to complete the high precision metrological verification of the transported medium.

Nowadays, environmental protection publicity has been increasingly attached great importance, why is the safety valve configured on the imported metering pump or dosing metering pump?

Safety valves play a reliable protective role in the system software, if there is no safety valve, sometimes even cause explosion accidents. It can open and close by itself according to the pressure at work, and is generally installed in the facilities of closed systems or pipeline maintenance system optimization; When the pressure in the machine equipment or pipeline exceeds the standard value, the pressure relief is opened by itself to ensure that the medium pressure in the machine equipment and pipeline is within the required standard value to avoid safety accidents. When the pressure of the system software exceeds the standard value, the safety valve automatically opens, and a part of the steam body in the system software is discharged to the air, so that the pressure of the system software does not exceed the specified value, and then in order to ensure that the pressure is not too high and cause safety accidents.

Safety valve is also known as speed control valve, several typical structural forms of safety valve:

Piston machine safety valve, valve center is a tablet computer.

The pressure effect of the pneumatic valve is on the piston rod. When the pressure exceeds the standard value confirmed by the torsion spring force, the piston rod is pushed open, and a part of the air is compressed into the air from the valve.

When the pressure of the pneumatic valve is less than the allowable value, the torsion spring pushes the piston rod to sink and closes the valve. The valve face should be clean.

Torsion spring type safety valve refers to the sealing of piston valve and high pressure gate valve depends on the mutual force of torsion spring.

With the need for capacity, there is a monopulse safety valve, also known as a dominant safety valve, which is composed of a main safety valve and an auxiliary valve. When the medium pressure in the pipeline exceeds the required pressure value, the auxiliary valve is opened first, and the medium enters the main safety valve along the hose, and the main safety valve is opened to reduce the increased medium pressure.

The consumption of the safety valve is determined by the specifications of the high-pressure gate valve and the relative height of the opening of the piston valve, which can also be divided into:

The relative height of the full opening is the diameter of the high pressure gate valve (1/15) ~ (1/20), and the full opening is (1/3) ~ (1/4).

In addition, with the application of different provisions, there are closed and non-closed. Closed that is, the discharged medium does not leak, and all are discharged along the required entrance and exit, generally used for harmful and corrosive media. Unenclosed medium is generally used.