Metering pump is an indispensable equipment in modern industrial production, is one of the special pump is very important and widely used in urban and rural water supply system, petroleum, chemical, pharmaceutical, food and other industries, in the process of engineering applications, want to choose the reasonable and accurate metering pump must understand the function of metering pump can timely solve some problems in the running process of the project, better play the engineering benefit. As a manufacturer of diaphragm metering pump, koyu machinery has summed up some of the information that should be paid attention to when choosing the metering pump.

Function of metering pump:

The metering pump can be divided into two categories: plunger type metering pump and diaphragm metering pump. It can be used in various kinds of medium such as flammable, explosive, corrosion, abrasion and slurry, and it can be widely used in chemical, petrochemical and water treatment.

The plunger metering pump is mainly divided into two kinds of valve pump and valve - free pump.

The plunger metering pump is widely used in the field of petrochemical industry because of its advantages of simple structure and high temperature and high pressure. A valve less rotary piston metering pump has been paid more and more attention to the shortage of ordinary piston pump under high pressure in high viscosity medium. It has been widely applied in the measurement and addition of high viscosity media such as syrup, chocolate and petroleum additives. Because of the problem of complete isolation from the measurement medium and the lubricant in the pump, the plunger metering pump is limited in the application of fluid transport measurement with high requirement for pollution prevention.

The hydraulic diaphragm metering pump is also called the plunger diaphragm metering pump.

The plunger metering pump is driven by the driving gear to drive the hollow plunger reciprocating and drives the measuring diaphragm through the hydraulic oil in the hollow plunger. The hollow plunger has a special design to adjust the air, so that the hydraulic oil inside and outside the plunger is the same. The piston outside the plunger has a adjustable slip ring for closing the regulating air. When the regulating hole is closed, the plunger pushes the hydraulic oil inside to drive the metering diaphragm. In each stroke, the amount of hydraulic oil that is driven by the plunger to drive the metering diaphragm is exactly equal to the quantity of the measured medium. The pressure diaphragm metering pump consists of the pump head, the diaphragm, the one-way valve, the valve ball and other components.

With the continuous application of new technology and new material, diaphragm metering pump is almost complete accurate delivery of any medium, can meet the needs of different kinds of strict process, flow can be adjusted continuously in 0-100, can be used to transport liquids (especially corrosive liquid), mechanical diaphragm metering pump is driven by motor, push rod guide and the connecting rod is connected with the guide diaphragm do reciprocating movement.

The flow rate of the metering pump is usually from l0-15000L/h, and the discharge pressure is from several to 1000bar. The power of the pump belt is from 0.12 to 55kW, and the larger flow is usually achieved by multi pump. It is an ideal equipment for accurate measurement and addition of fluid.

Select the information that the metering pump needs to know:

1. The flow of the measured liquid.

2. The main characteristics of the measured liquid, such as chemical corrosiveness, viscosity, and specific gravity.

3. The back pressure of the system.

4. The appropriate height of lift.

5. Other options are needed, such as analog control, pulse control, traffic monitoring and timers.