UNIWORLD Series
M/UNIWORLD-P/E ed. 01 2020
3.3
– CALIBRATION
The valves are supplied calibrated and tested, ready to work in the conditions requested by the client during the order
phase.
3.3.1
– PNEUMATIC ADJUSTMENT VALVES
If the adjustment valve must be calibrated again, the following tools will be necessary:
- a Bourdon spring gauge with scale 0-40 psi
- a pressure reducer filter or an air manipulator which can be finely adjusted in the range 0-35 psi
Having applied the reducer filter to the compressed air line, connect its output to the gauge and then the servomotor to
the adjustment valve to calibrate.
Check the calibration valve of the springs indicated on the descriptive label affixed to the yoke, “signal” field.
For
DIRECT ACTING valves (DA=air closes)
,
Figure
2000 DA
slowly adjust the reducer by registering it at the start
value of the valve.
The procedure is also valid for valves 2600 DA
– 2700 DA– 5600 DA
For example, if the signal planned is 3-15 psi, the valve must start to move at 3 psi and at 15 psi it must have executed
the entire stroke, reaching the compartment in the closure position.
If the start signal is under 3 psi, you must:
- loosen the nuts ref. no. 20 tightening the upper stem no. 22 with the lower stem ref. no. 6.
- screw in the lower stem ref. no. 6 to increase the start signal.
If the start signal is over 3 psi, you must:
- loosen the nuts ref. no. 20 tightening the upper stem no. 22 with the lower stem ref. no. 6.
- unscrew the lower stem ref. no. 6 to reduce the start signal.
“2000 DA”
Attention!
During the calibration phase,
ensure the valve executes the full stroke.
This operation can be visually inspected by
observing the indicator plate ref. no. 21 sliding
on the indicator label ref. no. 19.
Repeat
the
opening/closure
or
closure/opening operation until the right
values are obtained.
