| 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 Port Dia. (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 / 2X-30 | VR302 / V-302 / 2X-70 / 2BVA5121 | V-630 / 2x 2X-70 |
Precision-machined lobed rotors operate with zero internal friction or oil contact inside the pumping cavity, keeping vacuum process gas streams completely free of hydrocarbon vapor backstreaming.
Features an internal spring-loaded bypass valve that automatically protects the pump and motor from overload during high differential pressure conditions (≤8000 Pa), enabling reliable start-up.
Dynamically balanced figure-eight rotors and precision-ground helical timing gears maintain ultra-smooth rotation with minimal vibration and low noise output (≤63 dB to ≤68 dB).
Delivers high maximum compression ratios with low energy consumption. Fully supports customizable 3-phase multi-voltage motors (220V/380V/415V/480V, 50/60Hz) and explosion-proof (Ex) ratings.
The integrated bypass valve acts as an automatic differential pressure limiter. When the pressure differential between intake and exhaust exceeds 8000 Pa, the spring-loaded valve opens to recirculate gas, protecting the 4 kW motor from overload and allowing simultaneous startup alongside primary backing pumps at high intake pressures.
The VJP-1000 requires a primary backing pump. Recommended choices include heavy-duty rotary vane pumps like the GOFLEX VR302 / V-302 or 2X-70 for dry vacuum systems, or liquid ring pumps such as the 2BVA5121 / 2BVA5131 when handling moist air or process vapors.
Yes. Two VJP series Roots pumps can be staged in series with a backing pump to form a three-stage vacuum system. This configuration increases system pumping speed at low operating pressures and achieves ultimate vacuum levels down to 0.05 Pa.
GOFLEX provides full motor customization, including 220V/380V/415V/440V/480V 3-phase voltages across 50Hz and 60Hz frequencies, ATEX/Ex explosion-proof ratings, and custom protective finishes according to client specifications.
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