Metering pump flow adjustment methods have? Metering pump flow adjustment methods commonly used are: adjust the plunger or piston stroke, adjust the pump color, built a trip and pump speed three, of which the most widely used way to adjust the trip. Change the method is simple, reliable, still maintain a high measurement accuracy in the small flow. Stroke adjustment in the following three ways: 1, manual adjustment when parking: manual lifting in the parking Oh sister metering pump trip. 2, manual adjustment in operation: to change the axial displacement in the pump operation to simply change the crank radius, to achieve the purpose of adjusting the stroke length. Common methods are N-shaped crankshaft adjustment, L-shaped crankshaft adjustment and eccentric cam adjustment. 3, automatic adjustment in operation: There are two common pneumatic control and electric control. Pneumatic control is achieved by changing the air pressure signal to automatically adjust the stroke of the purpose; electric control is achieved by changing the electrical signal to automatically adjust the trip. Metering pump control: Precision machining accuracy to ensure that each pump out to achieve the precise measurement of the medium being transported. At a certain effective plunger area, the volumetric flow of the pump's output fluid is proportional to the stroke length and reciprocation frequency, ie, pump speed. In the measurement of medium and work pressure to determine the circumstances, by adjusting the stroke length and reciprocating frequency can be achieved on the metering pump output flow of two-dimensional regulation. The length of the inlet stroke and the reciprocating frequency can be used as the control variables, but in engineering applications, the length of the stroke is generally regarded as the coarse variable and the reciprocating frequency is the fine variable. The length of the stroke is adjusted to a certain value, and then the fine adjustment is performed by changing the frequency. Increase metering pump adjustment flexibility. In relatively simple applications, the stroke length can also be set manually, using only the stroke frequency as a control variable, simplifying system configuration.
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