Why is the metering accuracy of J-series metering pumps insufficient? How to calibrate?

When J-series metering pumps show deviation exceeding ±1% accuracy, it's often caused by three main issues.

First, blocked suction pipelines or worn valve balls/seat rings lead to backflow. The solution involves cleaning filters and replacing valve components if wear exceeds 0.2mm depth.

Second, flow fluctuations usually stem from loose stroke adjustment nuts or missing backpressure valves. Install a 0.3-0.5MPa backpressure valve within 1m of discharge port and tighten all adjustment mechanisms.

Third, broken drive pins in stroke mechanism require disassembly of gearbox side cover. Replace φ5mm pins with threadlocker adhesive and perform zero-point calibration.

For new pumps, conduct viscosity compensation calculations and manually purge air through diaphragm vent valves before final calibration.