TECHNICAL MANUAL MT103
23
4.3.1 HB/97 OPERATION (FIG. 13)
The cut-off device consist principally of the following parts:
• on/off valve (pos. 12);
• single action pneumatic actuator (pos. 11);
• line-off device (from pos.1 until pos. 10);
When there is no pressure, the valve obturator is held in the closed position by the spring, (pos. 13), and rests on
the valve seat. The control pressure is obtained by taking off gas at pressure Pe directly upstream from the valve.
The gas passes through the valve (1) (which can deviate pressure towards the downstream piping through a
bypass line) and, appropriately filtered by the filter (2), enters the pressure regulator (4), the purpose of which is
to stabilize the control pressure to the valve 3/2 (8) and then passes to the actuator (11). When the actuator is
filed, the valve opens.
Fig. 13
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