When water ring vacuum pump is working, attention should be paid to 1. As far as possible, it is required to operate in the high efficiency area, that is, in the critical vacuum or critical exhaust pressure area. 2. Avoid operating near the maximum vacuum or exhaust pressure. Operating in this area, not only the efficiency is very low, but also the work is very unstable, easy to produce vibration and noise. For vacuum pumps with high vacuum, cavitation often occurs when they operate in this area. The obvious sign of this phenomenon is that there is noise and vibration in the pump. Cavitation will cause damage to pump body, impeller and other parts, so that the pump can not work. Water-ring vacuum pump space gas-liquid separation technology principle, water-ring vacuum pump capillary gas-liquid separation technology principle: liquid water will spread on the surface of hydrophilic materials, if hydrophilic materials are made into porous structure (pore and pore gap between the connection), this porous structure, like many capillaries, will become a special channel for liquid water. Similarly, porous structures made of hydrophobic materials will become special channels for gases. In this way, the hydrophilic/hydrophobic properties of the material are utilized to achieve gas-liquid separation. The application of water-ring vacuum pump in canning machinery, the selection of vacuum degree and pumping volume of water-ring vacuum pump is the key to the success of V-shape. In production, the highest vacuum is about - Pa (- 500mmHg). Pressurized tank is a sealed container. Its main function is to stabilize the pressure of vacuum system, cushion the effect of system pressure on modeling, and also filter dust. Dust removal tank; long-term reuse of sand box and pouring of hot metal can easily cause damage to the filter screen of sand box. Sand is sucked into the water ring vacuum pump and causes wear and tear. It is better to increase the dust removal device by adding money into the water ring vacuum pump and connecting the dust removal tank to the vacuum pump finally to ensure the service life of the vacuum pump.