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Reasons for diaphragm damage of QBY stainless steel pneumatic diaphragm pump:

Nov 23, 2021

1. The support of the diaphragm control rod is severely worn, which makes the control rod eccentric and sinks, the force of the diaphragm increases, and the diaphragm is easy to tear.

2. There is a pressure difference in the unit, which causes the diaphragm pump to overpressure, and the diaphragm is ruptured due to an increase in the instantaneous force.

3. The nitrogen bag is pre-filled with 2.2mpa nitrogen, which has a good resistance effect. During operation, the pressure reflected on the pressure gauge is the operating pressure instead of the pressure of the nitrogen bag (it can only be seen when the pump is stopped). If the nitrogen bag is damaged or the pressure is reduced during operation, the diaphragm will run without resistance, which will cause liquid If the force is unbalanced, the diaphragm is prone to impact and damage.

4. The diaphragm of the diaphragm pump has poor quality, no elasticity, and low material strength.

5. The feed contains 3-8mm pebbles or bulk materials and the solid mass percentage in the slurry exceeds 20%, causing the valve to jam, causing the pump pressure to fluctuate, or the valve cone is not positioned correctly when the valve is assembled, causing a stabbing valve , Causing the diaphragm to be stressed instantly and cause rupture.

6. Due to the constant volume of the pneumatic diaphragm pump, if the feed is unstable and the pressure is low, the feed compensator's material level is lower than 1.2m, and the material level in the pressure regulator device is abnormal, and the slurry in the pump separates during feeding. The gap causes material shortage, emptying of the pump, hammering or impact or even cavitation, increasing the variable stress and frequency of the diaphragm, causing fatigue damage or breakdown of the diaphragm.


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