Piston pumps are used for most large level vacuum applications. These pumps Rotary Piston Vacuum Pump china 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 pumping speeds that range between 15 cfm to 2,000 cfm and the pumps can reach a pressure of just one 1 x 10-4 Torr. Rotary piston pumps could be ready for corrosive and oxygen program.