| Model / Parameter | VJP-150 | VJP-250 | VJP-500 | VJP-1000 | VJP-2000 |
|---|---|---|---|---|---|
| Pumping Speed (m³/h) | 153 | 253 | 505 | 1000 | 2050 |
| Partial Pressure (Pa) | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 |
| Total Pressure (Pa) | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Max Allowable ΔP (Pa) | 8000 | 8000 | 8000 | 8000 | 5000 |
| Inlet/Outlet Dia. d (mm) | 65 (70) | 65 (70) | 65 (70) | 100 | 150 |
| Max Compression Ratio (K0.max) | ≥ 35 | ≥ 35 | ≥ 40 | ≥ 40 | ≥ 50 |
| Noise Level Lw dB(A) | 63 | 63 | 63 | 68 | 75 |
| Oil Capacity (L) | 1.5 | 1.5 | 3.0 | 5.0 | 7.0 |
| Motor Power (kW) | 1.1 | 1.1 | 2.2 | 4.0 | 7.5 |
| Motor Speed (r/min) | 3000 | 3000 | 3000 | 3000 | 3000 |
| Cooling Method | Natural Air | Natural Air | Natural Air | Natural Air | Natural Air |
| Net Weight (kg) | 90 | 100 | 155 | 233 | 465 |
| Recommended Backing Pump | V-63 / 2X-8 | V-100 / 2X-15 | V-160 (VR160) / 2X-30 / 2BVA5111 | V-302 / 2X-70 | V-630 / 2x 2X-70 |
Features a built-in spring-loaded bypass valve that automatically routes excess pressure, preventing motor overload and allowing simultaneous startup alongside primary backing pumps.
Non-contact rotor clearance eliminates the need for lubricants in the compression chamber, keeping vacuum process systems completely free of oil vapor contamination.
Maintains large pumping speed (505 m³/h) under low inlet pressures, reaching ultimate vacuum rapidly with low total energy consumption (2.2 kW motor).
Precision dynamic balancing of twin figure-eight rotors and ground timing gears yields smooth rotation with low operational noise levels of ≤63 dB(A).
The bypass valve provides automatic differential pressure overload protection. When the pressure difference between the intake and exhaust exceeds 8000 Pa, the spring-loaded valve opens to recirculate gas, protecting the 2.2 kW motor and permitting early system startup.
The VJP-500 requires a primary pre-stage pump. Recommended pairings include rotary vane pumps (like GOFLEX VR160 or 2X-30) for dry processes, or liquid ring pumps (such as 2BVA5111) when evacuating moist or condensable vapors.
Yes. Two VJP series Roots pumps can be installed in series with a backing pump to form a three-stage vacuum system, achieving deeper operating vacuum levels and higher pumping speeds at lower inlet pressures.
GOFLEX provides customizable motor configurations, including 220V/380V/440V/480V dual-frequency (50Hz/60Hz) motors, explosion-proof motors, and custom paint finishes according to OEM specifications.
Get custom OEM configurations, detailed technical CAD drawings, and quick wholesale quotations within 12 hours.
