b) Connecting drain port T
These motors have a 1/8" G drain hole in the centre
of
the cover. The motor is supplied with the port closed
by a metal plug (see figure below).
Two non-return valves are incorporated
in
the motor casing to maintain internal pressure at the same level
as the low pressure line A or B if the drain port is not connected to the tank.
r------
.
A!
I
'
I
'
I
'
L---
lncorporated non-return valves
1)
lf
the drain port
is
connected up, pressure at the shaft seal is always equal to the pressure
in
the drain line.
2)
lf
the drain port is closed off, pressure at the shaft seal never exceeds pressure in the return line.
The maximum values for pressure
in
the drain line (case 1)
or
return line (case 2) are given
in
the foliowing
figure (for continuous and intermittent operating conditions).
bar
250
225
200
175
150
125
100
75
50
25
0
~p
l
'
0 100
-
- - - -
- int. operation
~
-----
i---..._
200
300
400
------
'
I
~
'
I
I,
I I
I
I
'-<>+<>-'
I
L
__
,
__
_j
____
x
_____
- - - -
- - -
- -
-
-
- -
max.
500
600 700
800 min.-
1
The drain port must always be connected up when more motors are operated in series.
26
@ Bonfiglioli
Trosmitol
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