... Vane Vacuum Pump 2. light weight, low noise 3. Equipped with anti-return oil valve, start convenient Rotary Vane Vacuum Pump Description ... used for the booster pumps, diffusion pumps, molecular pumps pump the first stage, the maintenance of pumps, pre-titanium ... return oil valve, start convenientTechnical parameters of rotary vane vacuum pump Type2XZ-12XZ-22XZ-4Pumping speed(L/s)124Ultimate pressure ( ...