TECHNICAL MANUAL MT103
10
As a result, the motorisation pressure value, Pm, increases and, by acting in the chamber E under the diaphragm
50 (fig. 1), causes the obturator 5 to move upwards and therefore an increase in the opening of the regulator until
the set-point of the regulated pressure is restored.
Vice versa, when the regulated pressure begins to increase, the force it exerts on the diaphragm 16 of the pilot
moves the mobile assembly 15 displacing the obturator 17, towards the closed position. The pressure, Pm, then
drops because of the transfer through the orifice 21, and the force exerted by
pressure Pep causes the downward displacement of the obturator 5, to restore the regulated pressure to the
set-point. In normal working conditions, the obturator 17 of the pilot positions itself so that the motorisation
pressure value, Pm, is such as to maintain the downstream pressure value, Pa, around the set-point.
Fig. 1
Fig. 2
PILOT DISCHARGE
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