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A) Pneumatic diaphragm pump does not start or slows down i Check that the filter, surge and lubrication devices and air inlet strainer are clogged. ii Check the air valve is stuck by impurities, please remove the valve and clean it, check the piston in the valve for scratches. If the piston surface is bright and not black, it means that worn piston and O-ring need to be replaced. Traces of injury. If the piston surface is bright and not black, it means that worn piston and O-ring need to be replaced. Please replace with new one iii. Inspect the spindle and O-ring for signs of scratches, abrasion and crushing, replace if damaged. B) The pump is running but the flow rate is too low. 1. Check if the pump body has cavitation spots and adjust the inlet pressure of the compressed air. Reduce the pump speed to adjust the viscosity and concentration of liquid. 2, check the valve ball is stuck. If the delivery of liquid and valve ball material does not match. The ball will be swollen Please replace the ball and seat of the suitable material. 3, please check whether the inlet pipe is blocked. C) export liquid contains a lot of bubbles 1, please check whether the rupture of the diaphragm. 2, check whether the pump body and pipeline leak. D) Liquid leaks from the air outlet of the air chamber 1. Check if the diaphragm ruptures. 2, check the diaphragm is installed and locked properly.