Common problems in the maintenance of diaphragm pneumatic pumps and how to correct them
Managers responsible for equipment maintenance know how important it is to ensure that all machinery works properly, in order to guarantee productivity and efficiency within the factory. It is very important to reduce downtime and keep everything running smoothly.
Although they are extremely versatile and reliable equipment, pneumatic diaphragm pumps also require periodic maintenance so that they continue to deliver the same efficiency and reliability. Furthermore, correct maintenance also helps to increase the useful life of the bomba, directly contributing to the profitability and financial health of the industry.
When a bomba suffers any unexpected stoppage, the entire production process can be impacted, generating great loss for the industry. The first step is to identify whether the problem is at the air end (main air valve/pilot valve) or the wet end (balls, diaphragms, seats). Once the problem is defined, maintenance can begin.
Air end
If it is determined that the problem is at the air end, maintenance should occur on the pilot valve and main air valve assembly. One of the main causes of problems with these components is the circulation of dirty air. If the presence of dirt is observed during disassembly, it may be a sign that a filter is necessary.
If there is no dirt on the components, but there is dirt in the fluids, there may be a failure in the diaphragm or its assembly. After cleaning the components, the valve can be reinstalled and the pump can operate again.
To avoid increasing pump downtime, users can keep spare air valves in order to speed up the maintenance process and bring more efficiency to the processes.
In the case of the pilot valve, the need to replace the self-sealing floating pneumatic rings must be analyzed. It is also very important to ensure that all air passages are clean before reinstalling components.
Due to their simple design, pneumatic diaphragm pumps allow repairs to be carried out in a simplified manner anywhere.
Diaphragm failures
One of the main indicators of failure in diaphragm is the pump exit through the exhaust. When this happens, the pump must be turned off, isolated using suction and discharge valves, and removed from the system. After disassembling and washing the pump, it is necessary to inspect the diaphragm for:
Perforations: check if anything blunt has been introduced into the pump and caused any cuts or holes. In this case, a screen filter can be installed in the suction line before the pump.
Scratches: some higher fluid inlet pressures can end up causing scratch marks on the diaphragm air inlet, where it is in contact with the pump's internal chamber, being more common when the pump is working with flooded suction. When this happens, it is necessary to raise the pump so that the center line is closer to the fluid line, or a counterpressure device can be installed to cushion the diaphragms.
Stretched central hole: this problem is caused by an incorrect torque value on the diaphragm's outer plate, causing it to recoil, or even very high pressures in the fluid inlet. In this case, it is necessary to adjust to the correct torque values.
Bubbling or deterioration: These signs indicate a chemical reaction. It is essential to consult a chemical compatibility guide before using your pump.
Always count on the duplation, your reliable supplier for pneumatic pumps. Contact us at (48) 3438-8484 or email vendas@duplacao.com.br And talk to our experts.
