Edwards nEXT400 User Manual

minimum 700 MPa tensile strength and equally ght
ened in a cross‑paern in
3 ghtening stages to a nal torque of 30 Nm to make sure equal compression of
the O‑ring and clamping of the anges.
Tighten all inlet ange bolts again when the system is under vacuum. Make sure that
torques or other forces are not transmied to the pump from the vacuum system or the
related pipelines. If necessary, install an inlet vibraon damper between the pump inlet
and the vacuum system and install the base of the pump to a rigid support, as given in
Base mounng on page 42.
4.3.4 Base mounng
The base of the pump can be installed to a rigid support using the tapped xing holes.
Refer to Figure: nEXT 240 dimensions (mm), Figure: nEXT 300 dimensions (mm) and
Figure: nEXT 400 dimensions (mm) for the installaon hole details.
Note:
Remo
ve the four rubber feet from the four tapped xing holes before you base mount
the pump.
Obey the requirements that follows to make sure that the pump stay secured if the
pump seize:
Support must withstand a destrucve tor-
que of:
6 KNm
Installaon screws:
4quanty of M8 to ISO898‑1 strength
class 12.9 (nominal ten-
sile strength 1200 MPa)
Screw engagement length: 6 mm minimum
Fastening torque: 15 Nm (1.53 kgf.m)
Use this method for installaon if the pump supports the weight of the vacuum system.
Make sure that the weight of the vacuum system is not more than 20 kg.
4.3.5 Backing port connecon
WARNING: PUMP OVER‑PRESSURE
Risk of damag
e to equipment. To prevent over-pressure in the pump, do not limit the
exhaust line when you vent from a posive pressure gas supply.
CAUTION: BEARING LIFE
Risk of damage t
o equipment. Do not use the pump with a backing pressure less than
5 x 10
-4
mbar (5 x 10
-2
Pa). Lower backing pressures increases the evaporaon rate of
the lubricaon oil and can decrease the life of the bearings.
Note:
Make sure that the ducng is done at the backing line if oil mis
t or hazardous substances
are available.
04/2022 - ©Edwards Limited
Page 42B80000880_G
B80000880_G - Ins
t
allaon

Edwards nEXT400 Specifications

General

Brand	Edwards
Model	nEXT400
Category	Water Pump
Language	English