The LSJ water jet Roots vacuum pump unit has the characteristics of large pumping capacity and high vacuum degree. It can also be used separately, that is, a water jet pump is used for rough vacuum, and a Roots pump is connected in series for high vacuum. The ultimate vacuum can reach up to 150Pa. The ultimate vacuum pumping degree of the water jet pump is limited by the water temperature, and can only reach a certain ultimate vacuum. After connecting the Roots vacuum pump in series, a higher vacuum degree can be achieved, and the pumping capacity is larger than that of general mechanical vacuum pumps or steam water series jet vacuum pumps. It is suitable for industries such as light industry, food, medicine, oil and pesticide.

The two-stage Roots water jet series vacuum pump unit is an additional Roots vacuum pump connected in series on the basis of the first stage Roots and water jet series vacuum pump. Its characteristics are high vacuum degree and large pumping volume. It can be used in sections according to actual working conditions. The water jet pump can work in a rough vacuum state. When high vacuum is required, the Roots pump can be started. The first stage Roots can reach 150Pa, and the second stage Roots can reach 30Pa. It is suitable for industries such as light industry, food, medicine, oil and pesticide.

The F3LSJ type three Roots water jet vacuum unit has the characteristics of faster pumping speed and higher vacuum, with a maximum vacuum of 2Pa. Equipped with an electric control box, the Roots pump can achieve automatic operation.