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