Range of Usage Z-series single and two stage oil-circulation spiral slice vacuum pumps are basic equipment to vacuate air-tighted vessel. They are applicable to refrigerating service (for F12, F22, R134a refrigerant), printing machinery, medical machinery, vacuum packaging, gas analysis, thermoplastic molding and other industries. They can also serve as primary pump for various fine vacuum equipment. Two stage oil-circulation spiral slice vacuum pump is to vacuate on the basis of single stage pump and it can realize most vacuum. Features 1. Anti-oil-returning design Special air passage is designed to prevent pump oil from returning to contaminate vacuum vessel and pipeline after the pump stops. 2. Environment protection design The product has a built-in device to eliminate oil mist and an oil-gas separator at air exhaust outlet to treat with oil contamination in air exhaust. 3. Aluminum alloy motor casing Motor adopts aluminum alloy to make its casing, which has high rate of heat emission and can guarantee continuous normal operation. Its appearance is also good looking. 4. Integrating design The motor and pump are integrated to make product compact, simple and rational. 5. Large starting torque This product is specially designed for low temperature and low voltage condition to guarantee a normal starting in winter (35°C temperature) and rated voltage ±10%. 6. Oil circulation design The product runs with extremely high ultimate vacuum and low noise.