Samson 42-34 Mounting And Operating Instructions page 44

Operation
Procedure for the Type 42-34 Regulator
Adjust the required set point by tensioning
the set point springs (16) at the set point ad-
juster (17).
For smaller differential pressure set points,
we recommend using a differential pressure
pressure gauge instead of the pressure
gauges (3 and 5) to check the pressure.
5. Close the motorized valve.
6. Unscrew the cap (1.3) and undo the lock
nut (1.2).
7. Turn the flow set point screw (1.1) coun-
terclockwise () as far as it will go (fully
open) to deactivate the flow limitation.
8. Relieve the tension from the set point
springs (16).
1 Shut-off valve
2 Strainer
Pressure gauge (flow
3
pipe)
Fig. 7-1: Installation example: Type 42-38 installed in the return flow pipe
7-2
1 2
6 4 8
–
Type 42-38 Differential
4 Pressure Regulator with Flow
Limitation
Pressure gauge (return flow
5
pipe)
6 Shut-off valve
9. Slightly open the motorized valve (ap-
prox. 10 % valve travel). See Fig. 7-1.
10. Adjust the differential pressure by turning
the set point adjuster (17) to load the set
point springs.
− Turn the set point adjuster (17) clock-
wise () to increase the pressure set
point.
− Turn the set point adjuster (17) coun-
terclockwise () to reduce the pres-
sure set point.
Change the plant throughput (e.g. by open-
ing and closing the consumer valve) to check
the adjusted differential pressure at the regu-
lator. Correct it, if necessary.
3 7
18
M
+
5 9
7
8
9
18
Motorized valve
Needle valve (optional)
Shut-off valve (optional)
Bypass with capped valve
(optional)
EB 3013 EN