3/9
© 2006 American Standard All rights reserved 973 002 981 3/05.2006
3
Test main valve
Fig. 3 Test diagram "Main Valve"
Fine control valve 11
8 bar
Manometer 11
Manometers 12/21
20 dcm³
Shut-off cock 11
42
1 dcm³
Manometers 41/42 Shut-off cock 41
Precision control valve 41/42
8 bar
8 bar
Fine control valve 43
Shut-off cock 42
11
41
22
12
Shut-off cock 21
Manometer 22
21
43
Manometer 43
Test step
Manometer (M)
Comment
Default value
Test value
M 11
bar
M 41
bar
M 42
bar
M 43
bar
M 12 /
M 21
bar
M 22
bar
Shut-off cocks 11, 12/21
and 43: Open the pass.
0
0
0
0
0
0
Fine control valves 11 and
43: Increase pressure
slowly.
8
0
0
8
8
0
Fine control valve 43:
Increase and lower the
pressure rapidly twice.
8
8
0
0
0
0
8...0
0...8
-
-
-
-
M 22 (test bench: Manome-
ter 4) must display an
immediate rise or drop in
pressure.
Check for leaks
Check tightness at exhaust
of the shut-off cock 42 and
at the exhaust of the
device.
8
0
0
8
-
-
Permissible leakage:
8 cm
3
/min
Never install
a leaking
trailer con-
trol valve on
the vehicle.
WARNING
Test instruction for
Trailer Control Valves
973 002
(E)
