Can a pneumatic diaphragm pump operate without load or under pressure for a long time?

Pneumatic diaphragm pumps can generally operate without load or under pressure for extended periods of time. Under no-load conditions, no liquid enters the pump; only gas passes through the pump’s diaphragm, resulting in less wear and damage to the pump’s components and materials. Under pressure buildup conditions, when the pump has no outlet pipe or the outlet valve is closed, a certain amount of pressure will build up at the pump’s inlet; however, under normal circumstances this does not cause damage to the pump. However, prolonged idling or pressure buildup can lead to some problems. For example, running the pump without load for an extended period of time can cause overheating or excessive vibration inside the pump, thereby damaging its components. Prolonged pressure buildup can lead to excessive pressure at the pump’s inlet, thereby damaging the pump’s diaphragm. Furthermore, if the outlet pipe is forgotten to be opened, the pump will run for an extended period without being able to discharge liquid properly, which may cause the pump’s components to overheat or get damaged. Therefore, to ensure the proper operation of the pneumatic diaphragm pump, it is recommended to operate it correctly before use, avoid prolonged operation without load or under pressure, and ensure that the outlet pipeline is properly open to prevent potential damage. .

These pumps belong to the category of positive displacement pumps, but the diaphragm possesses a certain degree of volumetric elasticity. So it’s okay to be in a no-load state under vacuum, but it’s not okay when there is pressure built up. For reference.

As long as the outlet remains open during prolonged idling, there is no risk; at most the diaphragm and diaphragm ball may get damaged. If the outlet valve is forgotten to be closed, the outlet can easily break due to pressure buildup, and the danger in such a situation is extremely high