Edwards nEXT85 User Manual

Fixing screws: 4 o M5 to ISO898-1 strength class 12.9 (nominal tensile
strength 1200 MPa)
Screw engagement length: 8 mm minimum
Fastening torque: 6 Nm (0.612 kgf.m)
Inlet connecon and pump orientaon
The pump can be securely xed to the vacuum system via the inlet ange. Do not operate the
pump in an
orientaon that is greater than horizontal.
CAUTION:
It is important that the pump be correctly orientated. The pump must only be orientated
in a horizontal or vercal posion. Incorrect orientaon may lead to premature pump
failure. Only store the pump such that the pump body is either horizontally in line with or
below the main inlet ange of the pump. If the pump is operated or stored at any me
with the pump body above the main inlet ange it is possible for oil - used to lubricate the
lower bearing - to escape from a reservoir at the base of the pump into the pump
mechanism or vacuum system. This may reduce performance and bearing life.
See Figure 2 on page 24 for allowable pump orientaon.
Make sure that the pump inlet and all components ed to the pump inlet are clean and dust-
free. If the pump inlet is not kept clean, the pump-down me may be increased.
The inlet connecons for the nEXT85 pumps are either ISO ange, CF ange or NW40 ange.
• If the pump has a CF ange, use the copper compression gasket supplied with the
pump and use a full complement of bolts to connect the inlet ange of the pump to
the vacuum system. A minimum grade screw of ISO898-1 class 5.6 (500 MPa tensile
strength) is recommended.
• If the pump has an ISO ange, use the Edwards combinaon inlet screen/trapped O-
ring supplied with the pump and use a minimum of four claw clamps (each torqued to
10 Nm) to connect the inlet ange of the pump to the vacuum system. Alternavely,
use a rotatable collar and the combined inlet screen and trapped O-ring supplied with
the pump to connect the inlet ange of the pump to the vacuum system; use a full
complement of minimum ISO class 5.6 bolts torqued to 10 Nm with the rotatable
collar.
• If the pump has an NW ange, use the centring ring supplied with the pump and a
metal NW clamp to connect the inlet ange of the pump to the vacuum system. In this
case, the base of the pump must also be xed to a rm support as described in Base
mounng on page 22.
All inlet ange bolts must be re-ghtened once the system is under vacuum. Ensure that no
torques or other forces are transmied to the pump from the vacuum system or the associated
pipelines.
B8G0-00-880A - Install the nEXT85
Page 23

Edwards nEXT85 Specifications

General

Brand	Edwards
Model	nEXT85
Category	Water Pump
Language	English