Flow metering methods commonly used metering pumps are: adjust the piston plunger plunger stroke (or piston), adjust the pump speed, both transfer and pump speed three, of which the most widely used way to adjust the trip. The method is simple and reliable, and can still maintain high metering accuracy at low flow rates. Metering pump stroke adjustment in the following three ways: (1) manual adjustment when parking: in the parking manually adjust the metering pump stroke. (2) manual adjustment mode during operation: change the axial displacement during pump operation to indirectly 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 mode of 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.
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