Combined vane pump ZYB-50/ZYB-80 has two upper cover structures A & C to choose from, suitable for connecting different pipelines. With a built-in oil and gas separator and relief valve, this kind of pump have advantages of low noise, large flow, and long lifespan.

Working Principle of Vane Pump
The combined vane pump is a vane pump and oil-air separator combined into one component. In terms of working principle, the combined vane pump can be divided into 2 main parts: vane pump & oil and gas separator. The vane pump assembly press-fitted in the combined pump housing together with the filter screen, overflow valve and oil outlet valve are collectively referred to as the vane pump part. And the part of the combined pump other than the vane pump part is the oil and gas separation part. Besides, the function of the oil-gas separator is to separate the gas in the oil and discharge it outside the machine. It can filter out the impurities in the oil, which provides pure oil without gas and impurities for users.

The location of the filter is a low-pressure chamber, the oil inlet of the low-pressure chamber is connected to the bellows, and the part where the oil-gas separation pipe is connected is a high-pressure chamber. In general, oil-gas separation pipe communicates with the oil outlet of the vane pump below one end, and the oil outlet of the vane pump below the other end. Moreover, relief valve and the oil outlet chamber behind the oil outlet valve are connected. Meanwhile, the cavity where the float is located is an atmospheric pressure chamber, and the atmospheric pressure chamber communicates with the atmosphere through the exhaust pipe.