Diaphragm pump is easy to damage the diaphragm design life of 8000h diaphragm pump, 6MPa working pressure in the import and export of material in the process of the diaphragm around both sides of the force, the maximum 4800kN, due to the continuous alternating force, easy to damage and cracking, Ke Yu machinery as a manufacturer of hydraulic diaphragm metering pump to summarize the reasons for the diaphragm diaphragm pump is easy to damage in the following areas:

Because the diaphragm chamber volume, if the feed is not stable, low pressure, the feed material is lower than that of the 12m compensator, voltage stabilizing device the material level is not normal, slurry separation gap is formed in the pump feed, cause the lack of material, playing air pump, which impact hammer or even cavitation, increased. The diaphragm under stress frequency increases, causing the diaphragm fatigue damage or breakdown.

The air chamber is not clean, the gas volume varies with the change of liquid pressure, promote the formation of air hammer, diaphragm local stress increases, the diaphragm will break.

(3) the feeding temperature exceeds the prescribed 100 degrees, accelerating the diaphragm aging. Meanwhile, when the bubble is generated in the slurry, when the gas enters the diaphragm chamber or the unloading valve leaks, the pressure of the advancing liquid decreases, which leads to the uneven stress and fatigue damage of the diaphragm.

The feed contains 3-8mm pebbles or solid bulk material and slurry mass percentage of more than 2%, caused by card valve, resulting in pump pressure fluctuations, or because the valve assembly, valve cone positioning, caused by stab valve, diaphragm caused instantaneous stress increase; rupture.

The feed and discharge of the diaphragm chamber is controlled by the position multiple of the probe control rod. If the magnetic ring of the control rod is weak, the probe can not detect the signal, so it cannot fill the oil in time, resulting in the rupture of the diaphragm on one side.

The diaphragm control bar supporting sleeve wear, the control rod eccentric, sinking, diaphragm stress increase, easy to crack the diaphragm.

The unit pressure, gas overpressure caused by diaphragm pump, diaphragm under instantaneous force increases caused by the rupture.

The crosshead piston or cylinder liner, loose, crosshead guide crosshead bearing caused by incorrect installation of the piston hammer, will cause the hydraulic imbalance; pump frequent jump stop, also can make the diaphragm instantaneous stress reached the limit, caused by rupture of the diaphragm.

To pre charge 2.2MPa nitrogen nitrogen package, has better damping. The operation when the pressure gauge pressure is reflected on the operating pressure rather than nitrogen pressure (packet only when the pump stops to see if the operation), nitrogen package damage or reduce the pressure, diaphragm pump in damp condition, will lead to hydraulic imbalance, the diaphragm is prone to damage due to the impact.

The diaphragm itself is of poor quality, no elasticity, low material strength.