Problem 1: Pump Runs But No LiquidCheck for vapor lock. The pump may be running too fast for the liquid to enter the chamber. Slow down the air supply. Also check if the suction line is blocked or if…
| Flow Rate | 0-30m³/h |
|---|---|
| Head | 0 – 50 / 70m |
| Inlet / Outlet Diameter | 10 – 100mm |
| Material | PP Engineering Plastic, Aluminum Alloy, Cast Iron, Stainless Steel |
Problem 1: Pump Runs But No Liquid
Check for vapor lock. The pump may be running too fast for the liquid to enter the chamber. Slow down the air supply. Also check if the suction line is blocked or if the inlet ball valve is stuck.
Problem 2: Low Flow
Possible causes include worn diaphragms, clogged ball valves, or low air pressure. Inspect the diaphragms for cracks. Clean or replace the ball valves. Verify air pressure is at least 2 Bar.
Problem 3: Air Valve Freezing
This happens when compressed air contains too much moisture. Install an air dryer or moisture separator. Drain the air receiver tank regularly.
Problem 4: Bubbles in Discharge
Air bubbles usually mean a ruptured diaphragm. Stop the pump and inspect both diaphragms. Replace if damaged. Also check that all clamps are tight.
Problem 5: Liquid Leaking from Air Exhaust
This is another sign of diaphragm failure. The liquid is crossing through the torn diaphragm into the air chamber. Replace the diaphragm immediately.
Quick Fix Reference
| Symptom | Likely Cause | Solution |
|---|---|---|
| No liquid | Vapor lock, blocked suction | Slow pump, clear line |
| Low flow | Worn parts, low air | Replace parts, boost air |
| Frozen valve | Wet air | Install dryer |
| Bubbles | Ruptured diaphragm | Replace diaphragm |
| Air exhaust leak | Torn diaphragm | Replace diaphragm |
Applications Summary:
maintenance troubleshooting, pump repair, industrial fluid handling, chemical transfer, wastewater
Thanks for visiting HAQUANPUMP. If you run into trouble with your QBY pump, our team can help diagnose and fix it. Just give us a call.
QBY Air-Operated Diaphragm Pump (AODD)The QBYS is the stainless-steel version of the QBY pneumatic diaphragm pump — SS304/SS316 for corrosive, food and hygienic fluids. Full size range, in stock.
QBY Air-Operated Diaphragm Pump (AODD)The Full QBY FamilyThe QBY series covers eight standard sizes from 10 mm to 100 mm. Flow ranges from 0.8 m³/h to 30 m³/h. Head goes up to 60 meters. There’s a model for almost every job. Complete Mode…
QBY Air-Operated Diaphragm Pump (AODD)When You Need Big FlowThe QBY-80 and QBY-100 are the largest standard models. They handle high-volume transfer jobs where smaller pumps would struggle. Both models share the same robust design princip…
