TECHNICAL MANUAL MT103
35
5.5
COMMISSIONING THE REGULATOR PLUS REFLUX 819 IN-LINE MONITOR WITH SB/82 SLAM-
SHUT VALVE (FIG. 24)
If there is also a relief valve in the line, refer to par. 3.1 to check it.
Check and adjust the intervention of the slam-shut 7 as follows:
A) For slam-shuts connected to the downstream piping by a three-way deviator push valve 11, proceed as follows
(fig. 21):
- connect a controlled auxiliary pressure to C;
- stabilise this pressure at the set-point established for the regulator;
- insert a reference pin 2 in the notch, pressing the knob 1 completely;
- reset the slam-shut device by means of the provided lever;
- keep the knob 1 pressed and:
•) for safety devices which intervention for maximum pressure: slowly increase the auxiliary pressure and
check the intervention value. If necessary, increase the intervention value by turning the adjustment ring
14 clockwise, or anticlockwise to reduce the intervention value.
•
) for safety devices for pressure increase and reduction: slowly increase the auxiliary pressure and record the
intervention value. Restore the pressure to the set-point established for the regulator, and carry out the
slam-shut reset operation. Check intervention for pressure reduction by slowly reducing the auxiliary
pressure. If necessary increase the intervention values for pressure increase or decrease by respectively
turning the rings 14 or 15 clockwise and vice versa to reduce the intervention values.
- check proper operation by repeating the operations at least 2-3 times.
B) On devices without the "push" valve (fig. 22) we recommend connecting the control head separately to a
controlled auxiliary pressure and repeat the operations described above.
ATTENTION
At the end of the operation, reconnect the control head to the downstream pressure take-off.
Fig. 24
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