Technical manual
MT 208-E
10
3.1.2 INSTALLATION WITH ON-OFF VALVE
(fig. 12)
1)
Close the on/off valve
16
;
2) connect a controlled auxiliary pressure to the take-off
17
and
increase it slowly to the envisaged intervention value;
3) check the intervention of the relief valve and adjust it if
necessary by turning the internal adjustment ring
14
appropriately (clockwise to increase the set-point, anticlockwise
to reduce it).
3.2 ACCELERATOR
An accelerator (fig.13) is installed on the REFLUX 819 regulator (use
as in-line monitor) to speed up the intervention in the event of failure of
the active regulator (recommended when used safety accessory
according to Directive 97/23/EC “PED”).
3.3
SB/82 SLAM-SHUT VALVE
The
SB/82
slam-shut device (see fig. 14-15) consists of an obturator A,
a releasing lever system, a control head
B
and a resetting system
which is controlled manually by the lever
C
. The pressure in the circuit
to control acts on the diaphragm in the control head
B
.
This diaphragm, which is integral with a control rod
D
, receives a
counter force by means of the minimum pressure springs
17
and the
maximum pressure springs
11
, set at the preset values .
The translation movement of this rod provokes the displacement of the
lever L which controls the release of the entire mobile system and frees
the obturator which is closed by the action of the spring
48
.
To reset the device, operate the lever
C
.
This opens an internal by-pass in the first part of ts stroke. This leads
to the filling of the downstream zone and balances the pressure on the
obturator. Then, complete resetting of the entire mobile system is
obtained in the second part of the stroke of the lever
C
.
Releasing can also be carried out manually by means of the button
101
.
fig. 12
fig. 13
Vent
fig. 14
CONTROL DEVICE
fig. 15
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