ZJP series roots vacuum pumps (built‑in overflow valve) adopt heavy‑duty export wooden cases with moisture‑proof and shock‑proof protection for long‑distance transportation. Pump inlet/outlet ports are sealed before shipment. Internal cushioning protects the overflow‑valve assembly against mechanical impact.
ZJP Series Roots Vacuum Pump (With Built‑in Overflow Valve)
The ZJP series roots vacuum pump is an improved mechanical booster pump equipped with built‑in overflow relief valve for overload protection. It is a positive‑displacement pump and cannot operate independently. It shall be used in series with backing pumps (slide‑valve pump, water‑ring pump, rotary vane pump etc.). A pair of figure‑8 rotors run synchronous counter‑rotation to realize gas suction and exhaust.
Model explanation: ZJP‑1200
ZJ = Roots vacuum pump; P = with overflow relief valve; 1200 = nominal pumping speed 1200 L/s.
Features
• Quick start‑up, achieves ultimate pressure rapidly; maintains large pumping speed over broad pressure range.
• No metal‑to‑metal friction between rotors and pump cavity. Low vibration, low noise, long service life and low maintenance cost.
• Oil‑free inside pump chamber, prevents oil vapor pollution to vacuum system; tolerant to fine dust.
• Built‑in overflow relief valve provides automatic overload protection to safeguard pump unit when pressure differential exceeds allowable value.
• Low power consumption for energy‑saving performance. Optimized sealing structure reduces gear‑chamber oil emulsification when pumping water vapor and solvent vapor in chemical & pharmaceutical processes.
Applications
Widely adopted for vacuum coating, chemical engineering, food processing, pharmaceutical production, vacuum metallurgy, electrical equipment manufacturing, electronics and solar‑energy industries. When equipped with two‑stage water‑ring backing pump, it handles large amount of water vapor, ideal for evaporation distillation and freeze‑drying production.
| Technical Specifications | ZJP‑70 | ZJP‑150 | ZJP‑300 | ZJP‑600 | ZJP‑1200 | ZJP‑2500 |
|---|---|---|---|---|---|---|
| Pumping speed(L/s) | 70 | 150 | 300 | 600 | 1200 | 2500 |
| Ultimate pressure(Pa) single‑stage backing pump | 5×10⁻² | |||||
| Ultimate pressure(Pa) two‑stage backing pump | 1×10⁻¹ | |||||
| Max. allowable differential pressure(Pa) | 8×10³ | 5×10³ | ||||
| Motor power(kW) | 1.5 | 2.2 | 4 | 7.5 | 11 | 30 |
| Flange size‑Inlet(mm) | 80 | 100 | 150 | 200 | 250 | 320 |
| Flange size‑Outlet(mm) | 80 | 100 | 150 | 200 | 200 | 250 |
| Cooling water consumption(L/h) | 120 | 120 | 120 | 150 | 150 | 300 |
| Max. allowable medium temperature(℃) | 100 | |||||
| Vacuum pump oil grade | 100# | |||||
| Weight(without motor)(kg) | 240 | 320 | 380 | 560 | 760 | 1800 |
Packaging Instructions
ZJP series roots vacuum pumps (built‑in overflow valve) adopt heavy‑duty export wooden cases with moisture‑proof and shock‑proof protection for long‑distance transportation. Pump inlet/outlet ports are sealed before shipment. Internal cushioning protects the overflow‑valve assembly against mechanical impact.
Packing List:
• 1 × ZJP series roots vacuum pump main unit
• Certificate, operation manual, packing list stored in waterproof pouch
• Seal gaskets, fasteners and spare components
Storage & Handling Notes:
• Examine package upon receiving; open and inspect unit if outer box is broken.
• Lift only via factory‑designed lifting points; avoid stress on overflow‑valve fittings, motor and pipes.
• Store indoors dry & ventilated.
• Keep horizontal position with tilt angle ≤5° to avoid internal oil seepage.