ZJP series vacuum pump (referred to as: Roots pump) refers to a variable-capacity vacuum pump in which there are two blade-shaped rotors that rotate synchronously in opposite directions, and there are small gaps between the rotors, the rotor and the inner wall of the pump casing without contacting each other.
| Model | ZJP-30 | ZJP-70 | ZJP-150 | ZJP-300 | ZJP-600 | ZJP-1200 | ZJP-2500 | ZJP-3600 | ZJP-5000 | |
| Exhaust Rate(L/s) | 30 | 70 | 150 | 300 | 600 | 1200 | 2500 | 3600 | 5000 | |
| Ultimate Pressure | Partial(Pa) | 0.06 | ||||||||
| Full(Pa) | 0.6 | |||||||||
| Max.Permissible Pressure Difference(Pa) | 5300 | 5300 | 5300 | 4300 | 4300 | 2700 | 2700 | 1800 | 1000 | |
| Compression Ratio at Zero Flow | 35 | 35 | 40 | 40 | 45 | 50 | 55 | 55 | 55 | |
| Motor Power(kW) | 0.75 | 1.1 | 2.2 | 3 | 5.5 | 7.5 | 18.5 | 30 | 37 | |
| Rotating Speed(r/min) | 1500 | 3000 | 3000 | 3000 | 3000 | 3000 | 3000 | 3000 | 2250 | |
| Inlet Diameter(mm) | 80 | 80 | 100 | 160 | 200 | 250 | 250 | 320 | 400 | |
| Outlet Diameter(mm) | 50 | 50 | 80 | 100 | 160 | 200 | 200 | 250 | 320 | |
| Noise(dB(A)) | 77 | 77 | 79 | 80 | 82 | 84 | 86 | 88 | 88 | |
| Pump Surface Temperature rise (K) | ≤26 | |||||||||
| ≤52 | ≤52 | ≤52 | ≤52 | ≤52 | ≤52 | / | / | / | ||
| Cooling Form | Forced internal water cooling | |||||||||
| natural air cooling | natural air cooling | natural air cooling | natural air cooling | natural air cooling | natural air cooling | / | / | / | ||
