What are the metering pump flow adjustment methods?

Metering pumps commonly used flow adjustment methods are: adjust the plunger or piston stroke, adjust the pump color, build a stroke adjustment and pump speed three, of which the most widely used way to adjust the stroke. The method is simple, reliable, and can maintain high measurement accuracy at low flow rates. There are three ways to adjust the stroke:

1. Manual adjustment when parking: Manually mention the travel of the sister pump when parking.

2, manual adjustment during operation: change the axial displacement during the operation of the pump, in order to simply change the crank radius, to achieve the purpose of adjusting the length of the stroke. Commonly used methods include N-shaped crankshaft adjustment, L-shaped crankshaft adjustment and eccentric cam adjustment.

3, automatic adjustment during operation: There are two common pneumatic control and electric control. Pneumatic control is the purpose of automatically adjusting the stroke by changing the air source pressure signal; the electric control is to achieve the purpose of automatically adjusting the stroke by changing the electric signal.

Metering pump control: The precise machining accuracy guarantees the precise measurement of the conveyed medium every time the amount of pumping is achieved. With a certain effective plunger area, the volumetric flow of the output fluid of the pump is proportional to the stroke length and the reciprocating frequency, ie the pump speed.

Under the condition that the measuring medium and the working pressure are determined, the two-dimensional adjustment of the output flow of the metering pump can be realized by adjusting the stroke length and the reciprocating frequency. The length of the inlet stroke and the reciprocating frequency can be used as the control variable, but in engineering applications, the stroke length is generally regarded as a coarse adjustment variable, and the reciprocating frequency is a fine adjustment variable: the stroke length is adjusted to a certain value, and fine adjustment is then performed by changing the frequency thereof. Increase metering pump adjustment flexibility. In relatively simple applications, it is also possible to set the stroke length manually, using only the stroke frequency as a manipulated variable, thus simplifying the system configuration.