NAVAC NRD4 PFPE 3PH - Dual Stage Rotary Vane Vacuum Pump

This NAVAC NRD4 Vacuum Pump is a high speed, dual-stage oil-sealed rotary vane vacuum pump. It has 3ph of power and is basic equipment to obtain vacuum and can be used to pump inactive gas within the scope of low vacuum and a small amount of non-condensable gas.

This pump is especially suitable for coating, refrigeration, freeze-drying, sterilization, instrument analysis, leak detection equipment, heat treatment metallurgy, etc. It can be used as a backing pump for roots pumps as well. This pump has a reasonable structure design for long failure-free operation. It features high reliability, high flow rate, low ultimate pressure, and low noise level. The pump has no oil spray, no leak and is easy to maintain.

Principle of Gas Ballast

The controllable gas (generally dry air at room temperature) is admitted into the pump chamber. It is mixed with pumped vapor during the gas compression process.

This increases the percentage of non-condensable gas such that the partial pressure of the vapor being pumped is below its saturated vapor pressure when the exhaust valve opens. The vapor is then discharged from the pump without liquefaction. The more vapor contained in the pumped gas, the more dry air is required.

Perfect Design and Performance

1. Two-shift adjustable gas ballast valve satisfies the different requirements of condensable gas to be exhausted.
2. Dual automatic anti-sucking back design protects vacuum system from oil pollution when pump stops running and needs to be easily restarted.
3. Forced oil circulation system ensures stable running of the pump.
4. Integrated cylinder structure and pin connection convenient and accurate for maintenance and inspection.