EH - Roots Booster
The EH mechanical booster pumps feature the unique hydrokinetic drive, providing an efficient power transmission with benefits in economy, performance and compactness, while making them extremely robust.
The EH range is ideal for use with high differential pressures, allowing the booster pump to be started at the same time as the backing pump, reducing your total pump down times and making your operations simpler.
Pumping Speeds
250, 500, 1200, 2600, 4200 m3/h
Pressure differential
0-180 mbar
Special Versions
Atex, Chemical, PFPE
Stable Operation
optimised clearances and after coolers.
Performance
Increased productivity, faster pump down time due to unique hydrokinetic drive.
Simplicity
No need for pressure switches, bypass lines or variable frequency drives.
Robust Operation
Up to date technology – continued investment in design and technology improvements.
Reliability
Safe operation. Automatic overload protection and reliable shaft seal design.
Reduced Costs
pressure inverters reduce installation costs. Easy installation, minimal maintenance.
Displacement
Pressure differential
Drive type
Inlet connection
Outlet connection
Motor rating
Cooling method
m³/h
mbar
ISO
ISO
kW
EH250
310
0 - 180
hydrokinetic
63
40
2.2
Air
EH500
505
0 - 110
hydrokinetic
100
63
2.2
Air
EH1200
1195
0 - 90
hydrokinetic
160
100
3
Air / Water
EH2600
2590
0 - 120
hydrokinetic
160
100
11
Water
EH4200
4140
0 - 70
hydrokinetic
250
100
11
Water
Our proven shaft seal design helps protect the pumping mechanism and gearbox from cross-contamination with even your harshest applications. EH booster pumps are not damaged by sudden increases of inlet pressure helping you to avoid unscheduled breakdowns and improve overall process performance.
The varying rotational speed of the pump protects the motor from overload and over-heating for longer-life operation. The built-in hydrokinetic drive automatically allows the pump to operate with high-pressure differentials, making this a highly flexible workhorse.
The EH mechanical booster pumps, based on the simple Roots principle, remain the favorite pumps for applications where high pumping speeds over 3000m³/h are required in the pressure region of 0.01 to 50mbar. These must always be backed by another pump which can deliver against a high pressure differential to atmospheric pressure. Operating at relatively low pressures, the mechanical booster pump is not exposed to the same concentrations of corrosive process media as is the backing pump, which makes it highly reliables.
Vapours condensing in pump oil leads to poor lubrication, increased wear of moving parts and loss of vacuum performance.
The EM is designed to run hot and has a two open position gas ballast valve to allow the highest gas ballast flowrates of any similar sized pump. The EM pump has great flexibility to operate on applications as a high-vacuum mode or as a high-throughput mode.
All two-stage pumps have to "compromise" the oil lubrication system to achieve good ultimate vacuum, but if the pump is operated at high inlet pressure or with high vapour loads, the high vacuum stage will suffer from oil starvation and high rates of condensation of vapours in the oil. Edwards unique "Mode Selector Switch", in combination with gas ballast position GB2, allows the pump to handle the highest vapour loads of any pump in its class without any wear or loss of lubrication.
1. Lifting bolt 2. External evacuation port
1. Lifting bolt 2. External evacuation port
1. Lifting bolt
1. Lifting bolt
1. Lifting bolt
Documentation
