Elmo Rietschle C-KLR 80/140 - Manual (Page 15)

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Installation
5.3 Connecting pipes
a) Vacuum connection at (Fig. 2/A) and pressure
connection at (Fig. 2/B).
NOTICE
Material damage resulting from the forces and
torques of the pipes on the unit being too high.
Only screw pipes in by hand.
The pumping capacity of the machine is redu-
ced if the suction pipe is too narrow and/or too
long.
b) Check to ensure the intake line and pressure
connection are connected correctly.
NOTICE
Length of the connection pipes
With connection pipes that have the same pipe
cross section as the machine connection and are
more than 3m long, a non-return valve especially
for the purpose must be installed in order to avoid
reverse operation when the machine has stopped.
5.4 Relief valves
As a protection against overload safety valves
(Fig. 2/ZUV) and (Fig. 2/ZBD) are installed as stand-
ard.
NOTICE
Do not operate without standard relief valves.
If the permissible fi nal compression pressure and
the permissible vacuum are exceeded (see data
plate) the machine may be damaged.