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Payal, although oil sealed rotary vane pump and liquid ring pump are positive and wet displacement pump their working aren’t the same. In oil sealed rotary vane pump the gas entering the inlet port gets trapped by an eccentrically mounted rotor. This rotor compresses the gas and pushes it to the exhaust valve. The exhaust valve is spring loaded and lets the gas to discharge but only when it exceeds the atmospheric pressure. The purpose of oil here is used to seal and cool the vanes. I don’t in detail working of liquid ring pump. I just know that is it isn’t same as oil sealed rotary vane pump.

Rajshree you are right. Both the pumps have different working. Working of the liquid ring pump – This pump compresses gas by rotating the vaned impeller located within the pump. Liquid is then fed into the pump. The centrifugal acceleration moves cylindrical ring (against the inside of the casing). The liquid ring then creates multiple seals in the empty space between the impeller vanes. The eccentricity between the pump housing and impeller axis of rotation leads to a cyclic variation of the volume that is enclosed by the ring and the vanes. Next the ring compresses the gas and discharges it through an exit port at the end of the housing.

Visit https://www.gardnerdenver.com/en/knowledge-hub/articles/liquid-ring-vacuum-pumps, https://www.pfeiffer-vacuum.com/en/know-how/vacuum-generation/rotary-vane-vacuum-pumps/design-operating-principle/

Thank you guys for the explanation and links.