TECHNICAL MANUAL MT103
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4.2.1 SB/82 SLAM-SHUT OPERATION
The SB/82 slam-shut device (see fig. 9) 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 its 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. 9
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