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NES Company Inc. at 1-800-297-3550 or email at
info@nescompany.com
When contacting NES Company Inc., please be ready
with the following information:
1. A reference number to locate your pump in NES
Company Inc.'s system.
2. The nature of the process in which the pump is
used.
3. The steps taken so far in the installation and set-up
of the vacuum pump.
4. Please ensure that the manual has been completely
read by all the people involved in operating the pump.
Section 3: How the N.E.S. NBE pump
works
3.1 Principle of Operation
The NES NBE series pumps are single-stage liquid
ring vacuum pumps which rely on the rotation of an
impeller to create a liquid ring seal within the pump
3.2 Operational parameters
The NES NBE series of liquid ring vacuum pumps
comprise of the sizes ranging from NBE1-152 to
NBE4-7000. The increasing number indicates
increasing suction capacity. The single stage NBE
NBE O & M Document No. NES/NBE/O&M
Fig. 1. NBE Series Liquid Ring Vacuum Pump
chamber, which enables the pumps to create a
vacuum. Initially, the pump is filled with a sealing
fluid, typically water or another compatible liquid,
which acts as both a sealant and a compressing
medium. The impeller is mounted on a rotating shaft
driven by an external motor, starts to rotate within the
pump chamber generating a centrifugal force which
impeller pushes the sealing fluid towards the outer
periphery of the pump chamber forming a concentric
liquid ring. As the impeller continues to rotate
towards the discharge port, the space between the
impeller blades gradually decreases due to the presence
of the sealing fluid. This compression action causes
the gas to be compressed against the sealing fluid, and
the resulting gas-fluid mixture is discharged through
the discharge port. The sealing fluid plays a crucial role
in the Operation of the NES NBE Series pumps,
ensuring effective sealing, gas compression, heat
dissipation, and contaminant removal. The fig. 1
shows a typical NBE series liquid ring vacuum pump.
series vacuum pumps are designed to operate with dry
and moist gases with inlet temperature min. 32 °F and
max. 176 °F, inlet pressure up to 28" Hg. Some pumps
in this series operate to 23" Hg. For more details,
please refer to the NES NBE Series Data Sheet, pump
drawings, and performance curves.
Page 6 of 43
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