The JZJW type Roots-vertical oil-free reciprocating pump unit is composed of a ZJ type Roots pump as the main pump and a WLW type vertical oil-free reciprocating pump as the backing pump connected in series. It overcomes the shortcomings of the WLW type vacuum pump, such as high ultimate pressure and low pumping speed at certain pressures, while retaining the advantages of the ZJ type Roots pump, such as rapid operation and high pumping speed. Therefore, this unit is widely used in processes such as vacuum distillation, vacuum evaporation, dehydration crystallization in the chemical industry; freeze-drying in the food industry; and vacuum drying in the pharmaceutical industry.
Since the WLW type vacuum pump uses oil-free self-lubricating materials, it can achieve clean vacuum. Therefore, after installing an exhaust gas collection device at the exhaust port, this unit can collect gases that cannot be condensed or compressed in high vacuum systems, such as pentadiene, benzene, toluene, etc., avoiding environmental pollution caused by their low boiling points and difficulty in collection.

Performance and Specifications

Model Explanation:
J ZJ W 300 - 22 　　J: Unit code (J)　　 ZJ: Main pump code (ZJ type Roots pump)
W: Backing pump code (WLW type oil-free reciprocating vertical vacuum pump)　　 300: Geometric pumping speed of the main pump (300 L/S)　　 22: Represents the geometric pumping speed ratio codes, which are 2 and 2 respectively.