The entire series is equipped with QT500 high-strength ductile iron rotor, with a tensile strength of 500 MPa and an elongation rate of 15%.
The composite sealing structure technology completely solves the emulsification and leakage problems of vacuum pump oil, making it more stable and reliable.
The accessories are precisely manufactured by imported processing centers, with strict control of the gaps between rotors and between rotors and the pump body, ensuring stable operation when the gap is less than 0.05mm.
Independently produced and manufactured, it has over 40 vacuum-related patents, has been rated as a national high-tech enterprise and a science and technology enterprise, and has passed ISO9001 quality management system certification.
The spiral jacket cooling method ensures excellent heat exchange efficiency, fully guaranteeing the low-temperature lubrication performance of the lubricating oil, thereby extending the service life of gears, bearings and mechanical seals.
The use of precision gears (5-level accuracy) for rotation and precision couplings for connection ensures the smoothness and accuracy of the pump's operation, with extremely low running noise.
High-strength, high lateral force precision bearings from fully imported (SKF/NSK) are selected and lubricated by splash lubrication, which can greatly extend the pump's service life.
A bypass valve is set inside, allowing the Roots vacuum pump and the preceding vacuum pump to almost simultaneously start under atmospheric conditions to shorten the pumping time.
Product Parameters
High Pumping Speed
Flow capacities from 30 up to 5000 L/s
Versatile Power Range
Motor power ratings from 1.5 kW to 37 kW
Controlled Noise Level
Smooth operation tested ≤78 to 88 dB(A)
| Model Number | Maximum Suction Rate (L/S) |
Intake Diameter (mm) |
Exhaust Pipe Diameter (mm) |
Noise ≤dB(A) |
Motor Power (kW) |
Speed (r/min) |
|---|---|---|---|---|---|---|
| ZJP-30 | 30 | 80 | 50 | 78 | 1.5 | 1420 |
| ZJP-70 | 70 | 80 | 50 | 78 | 1.5 | 2840 |
| ZJP-150 | 150 | 100 | 80 | 81 | 3 | 2880 |
| ZJP-300 | 300 | 150 | 100 | 82 | 4 | 2890 |
| ZJP-600 | 600 | 200 | 150 | 84 | 7.5 | 2900 |
| ZJ-1200 | 1200 | 250 | 200 | 85 | 11 | 2940 |
| ZJ-2500 | 2500 | 300 | 250 | 87 | 22 | 2940 |
| ZJ-5000 | 5000 | 400 | 400 | 88 | 37 | 2940 |
The ZJP series features a built-in overflow/bypass valve designed to prevent motor overload during high-pressure differentials, making it self-protecting. The ZJ series represents standard Roots vacuum pumps suited for high pumping speed systems requiring external pressure monitoring and higher power outputs.
No. Roots vacuum pumps (both ZJP and ZJ series) cannot discharge directly to atmospheric pressure. They require a backing pump—such as a rotary vane pump, liquid ring pump, or reciprocating vacuum pump—to achieve optimal operational conditions.
Model selection depends primarily on the required maximum suction rate (from 30 L/s to 5000 L/s), the working vacuum pressure range, inlet piping diameter requirements, and the capacity of the backing pump system.
The rotational speed is engineered to match the motor configuration, rotor design, and target pumping speed. Models like ZJP-30 run at 1420 r/min for steady lower flow rates, while high-velocity models like ZJP-70 through ZJ-5000 operate around 2840–2940 r/min to optimize gas compression and throughput.
Regularly check and replace gear lubricant, verify dynamic balance and rotor clearances, inspect mechanical seals for wear, and ensure the connecting pipelines are properly aligned to maintain noise levels within the specified ≤78 to 88 dB(A) range.