Diaphragm metering pump with zero leakage, high measurement accuracy, low noise, widely used in petroleum, textile and other industries. The diaphragm metering pump is mainly used for the transport of flammable, explosive, toxic, corrosive and radioactive liquid. Department of machinery as diaphragm metering pump manufacturers, today we briefly introduce the diaphragm metering pump.

The disadvantage of diaphragm metering pump is the easy rupture of diaphragm, especially the fixed stroke diaphragm pump. Once diaphragm ruptures, metering fluid and hydraulic oil system pollute each other, we need to improve diaphragm metering pump. First, introduce the working principle of diaphragm metering pump.

Diaphragm metering pump is composed of motor, drive mechanism and pump head. Through the transmission device to change the rotation movement generated by the motor into reciprocating motion of the plunger. The plunger to reciprocate in the pump cylinder between two end points, through the hydraulic oil to drive the diaphragm alternately on both sides to bend, to complete the suction and discharge work process.

The operating room in contact with the fluid metering, separated by the diaphragm and the hydraulic chamber. The hydraulic chamber and the hydraulic oil tank by the piston, double function hydraulic valve and a built-in type oil supply valve. The double function hydraulic valve separated from the exhaust valve and pressure relief valve exhaust valve in the hydraulic chamber. The highest point, in order to eliminate the gas in the liquid pressure chamber aggregation caused by measurement error; the pressure relief valve to protect the pump. To prevent overpressure.

During the suction stroke after the diaphragm pressure to the control rod, and push it to the back stop. The fill oil valve and the hydraulic chamber. If the vacuum chamber is formed by hydraulic pressure reaches the set value, the fill oil valve open, mechanical oil supplement. Hydraulic oil feeding by the tank to the hydraulic chamber, to balance the exhaust valve and plunger seal to discharge the oil in the tank.