Mechanical diaphragm metering pump manufacturers division building found in diaphragm metering pump plunger reciprocating motion through the plunger of the hydraulic cavity between the diaphragm and the liquid is passed to the diaphragm. In order to maintain the normal movement of the diaphragm hydraulic demands liquid in the cavity closed space (generally adopt hydraulic oil) volume remains constant. In this way can we guarantee the diaphragm always equal volume formed by the movement of plunger stroke volume and maintain the stability of the flow of the pump; However, during the actual operation of the pump, due to the leak of the plunger seal, the gas may enter the hydraulic cavity.

In addition, the volume of fluid in the hydraulic chamber may be changed when the oil filling is too much or the pressure of the outlet pipeline is unexpectedly elevated, thus affecting the stability of the flow and reducing the measurement accuracy of the pump.

How to stabilize the flow of the metering pump and how to stabilize the measurement accuracy of the metering pump?

Using three valve gear actual refers to the hydraulic chamber matching including compensation, deflated, security protection a combination of three kinds of function of the device, or device, according to the principle of its action of automatic compensation and mandatory compensation is divided into the two three valve gear.

Three valve automatic compensation device is used widely in the diaphragm metering pump, especially in case of suction height requirements can only use this compensating device. The three valve device is made up of three separate fujian (safety valve, relief valve and fill valve).