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Piston pumps are used for most large scale vacuum applications. These pumps possess a sliding sleeve by which the gas enters, after that drawn into a cylindrical chamber and exhausted by a rocking piston plunger. These pumps are extremely hardy and have Rotary Piston Vacuum Pump china pumping speeds that range from 15 cfm to 2,000 cfm and the pumps can reach a pressure of just one 1 x 10-4 Torr. Rotary piston pumps can be prepared for corrosive and oxygen assistance.