TECHNICAL MANUAL MT103
16
Fig. 4
Fig. 5
Obviously the quantity of gas released depends on the extent of the overpressure with respect to the set-point. The
different models of relief valve available are all based on the same operating principle which is illustrated below with
reference to the valve VS/AM 56 (fig. 4).
It is based on the contrast between the thrust on the diaphragm 24 deriving from the pressure of the gas to being
controlled and the thrust from the setting spring 20. The weight of the mobile assembly, the static thrust and the
residual dynamic thrust on the obturator 4 also contribute to this contrast.
When the thrust deriving from the pressure of the gas exceeds that of the setting spring, the obturator 4 is raised
and a certain quantity of gas is released as a result.
As soon as the pressure drops below the set-point, the obturator returns to the closed position. Proceed as
indicated below to control and adjust intervention of the relief valve.
3.1.1 DIRECT INSTALLATION IN THE LINE (FIG. 5)
When the relief valve is fitted directly in the line, that is without inserting an on-off valve, proceed as follows:
1) Ensure that the downstream on-off valve V2 and the bleed cock 6 are closed.
2) Increase the pressure in the downstream section up to the value envisaged for intervention in one of the
following ways:
- if the spring fitted on the pilot permits it (see table 1), increase the setting of the pilot itself until the desired
value is obtained;
- connect a controlled auxiliary pressure to the cock 6 and stabilize it at the desired value;
3) Check the intervention of the relief valve and adjust it if necessary by turning the adjustament plug 13
appropriately (clockwise to increase and anticlockwise to decrease).
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