ZJP Series Roots Vacuum Booster Pumps

Product OverviewZJP Series

The ZJP Series consists of Roots vacuum booster pumps equipped with an integrated bypass valve for differential-pressure protection and simplified system start-up. Based on the proven Roots pumping principle, the bypass valve limits excessive pressure differential across the booster during initial evacuation and high-gas-load conditions. This allows the ZJP booster to operate from an earlier stage of the evacuation cycle and, in properly configured systems, to start together with the backing pump without waiting for the pre-vacuum normally required by a standard ZJ booster. The ZJP Series provides nominal pumping speeds from 252 to 9,000 m³/h (70–2,500 L/s) for a wide range of industrial vacuum systems.

Working Principle

The ZJP Series uses the same non-contact Roots pumping principle as the standard ZJ Series, with an integrated bypass valve connecting the discharge side to the inlet side. When the pressure differential across the booster exceeds the specified bypass setting, the valve opens and allows part of the gas to recirculate from the discharge side to the inlet side, limiting the pressure differential and protecting the pump from overload. As the backing pump reduces the system pressure and the pressure differential falls, the bypass valve progressively closes, allowing the ZJP booster to provide its full pumping capacity.

Key Features

Integrated bypass valve for differential-pressure protection

Allows earlier booster operation during system evacuation

Can start together with the backing pump in properly configured vacuum systems

Automatic bypass operation according to pressure differential

Non-contact rotor operation minimizes mechanical wear

Pumping chamber requires no internal lubrication, minimizing oil contamination of process gas

High pumping capacity with relatively low installed motor power

Simplified start-up control compared with standard ZJ Roots boosters

Wide pumping-speed range from 252 to 9,000 m³/h (70–2,500 L/s)

Simple and robust construction for industrial vacuum systems

Model	Pumping Speed	Ultimate Pressure*	Motor Power	Speed (RPM)	Bypass Valve ΔP	Inlet	Outlet	Weight
ZJP-70A	252 m³/h (70 L/s)	0.75 Pa	1.1 kW	2880 rpm	5300 Pa	80 mm	80 mm	110 kg
ZJP-150A	540 m³/h (150 L/s)	0.75 Pa	2.2 kW	2880 rpm	5300 Pa	100 mm	100 mm	190 kg
ZJP-300A	1080 m³/h (300 L/s)	0.75 Pa	4 kW	2880 rpm	4300 Pa	150 mm	150 mm	265 kg
ZJP-600G	2160 m³/h (600 L/s)	0.75 Pa	7.5 kW	2880 rpm	4300 Pa	200 mm	200 mm	570 kg
ZJP-1200G	4320 m³/h (1200 L/s)	0.75 Pa	11 kW	2880 rpm	2700 Pa	250 mm	200 mm	770 kg
ZJP-2500G	9000 m³/h (2500 L/s)	0.75 Pa	18.5 kW	2880 rpm	2700 Pa	320 mm	320 mm	1500 kg

Pumping speeds are nominal values at 50 Hz. 1 L/s = 3.6 m³/h.

Bypass Valve ΔP: Differential pressure at which the integrated bypass valve operates to limit excessive pressure differential across the Roots booster.

*Ultimate pressure depends on the backing pump, vacuum-system configuration and operating conditions. ZJP Series Roots vacuum boosters are designed to operate with a suitable backing pump.

Typical Applications

Chemical Processing

vacuum distillation, solvent recovery and process vacuum

Vacuum Drying

industrial drying and high-throughput evacuation

Metallurgy & Heat Treatment

vacuum sintering, brazing and heat-treatment systems

Vacuum Coating

industrial coating and deposition vacuum systems

Automated Vacuum Systems

simplified start-up for automated and frequent-cycle operation

Industrial Vacuum Systems

high-capacity Roots booster systems with backing pumps

ZJP Series Roots Vacuum Booster Pumps

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