Compressor oil station

Isn't this the outlet of the oil pump connected to the inlet of the pump? The purpose is to control the backflow to ensure that the oil pump has sufficient circulation volume and will not cause the temperature of the oil pump to rise if the measurement is too low.

This is a screw pump. The return oil does not return to the pump inlet, but goes to the fuel tank.

Can't the pump outlet pressure be adjusted by the last regulating valve?

The part of the pump body is called a pressure reducing valve, which adjusts the output of the pump to a constant pressure. The following adjustments are for the oil pressure of the oil system (common oil main pipe). In front of each lubrication point, it is best to have a throttle bolt (or throttle valve) to control the oil pressure (oil quantity) of the lubrication point. For reference.

This controls the oil pressure at the pump outlet. If the oil pressure is too high after the backup pump starts, it will play a role. Only by ensuring that the pump outlet is stable can the lubricating oil main pipe pressure be stable.

It is said to prevent the pump outlet pressure from being too low and the water in the cooler to be exposed into the lubricating oil?

This statement must be based on principles. The decompression of the pump body is to ensure the user's appropriate adjustment below a certain limit. The adjustment of the oil system is set according to the needs of the lubrication points. In addition, special attention should be paid to the outlet pressure of the two pumps with a chain, which must be adjusted to equal pressures to ensure the safe use of the chain. Usually there are check valves and filters in front of the pump. The output pressure of the pump body is low, and the pressure reducing valve has basically no effect. Cooling water leaking into the oil is usually possible during shutdown. During normal production, it is impossible for the oil pressure to be greater than the water pressure. Even if the oil is emulsified, it can still have a certain lubricating effect, and it will cause the oil in the tank to overflow. This issue is too extreme to discuss. If the emulsified oil shows up from the pressure, don't talk about it anymore. Maybe your site is unattended. If so, something worse than this phenomenon may happen. Discussing issues must be well-founded and not "just say,,,,". study * Only by processing and understanding the various information obtained can it be credible. The output pressure of the pump is low, which can cause automatic switching or manual switching. The pump can be stopped for maintenance or the filter can be cleaned. ； To monitor oil cooler leakage, it is necessary to regularly analyze the oil discharged from the bottom of the oil tank for grease analysis and testing. It is also necessary to monitor in real time whether there is floating water on the surface of the return pool, so that oil leakage can be judged. This is the most basic operation. Personal opinion, for reference only.

Some people say that the last self-supporting valve adjustment is enough. In fact, this is not the case. Oil temperature and pressure are very important in the oil system, especially the oil system of the compressor. The pressure at the pump outlet is also particularly important, which involves the pressure chain of lubricating oil. Set up such a self-supporting valve at the pump outlet. After setting the oil pressure to automatic, the oil pressure can be adjusted in time through the automatic change of the valve, stabilizing the oil pressure, which has the most direct effect on the stability of the rear system. Adjusting the oil return through the self-supporting valve It returns to the fuel tank, which will not have a big impact on the rear system. If only the last self-supporting valve is installed, when the oil pressure changes greatly, if the adjustment is not timely, it will cause the risk of chain shutdown. For example, if we want to cut the pump, the oil pump switching in the oil station has great requirements on the stability of the pressure. At this time, we must pay close attention to setting the pressure by setting the self-supporting valve. It is much safer. If there is only the last one, the adjustment will lag, which is very dangerous.