Relief valve, max. pressure 1 bar

VS202.05

Spring loaded, automatic relief valve, Dn 25, max pressure 1 bar, pressure range 30 - 110 mbar

Relief valves are safety devices that vent a certain amount of gas to the atmosphere when the pressure at the control point exceeds the set pressure (burst pressure) due to temporary events such as for example quickly closing a shut-off valve and/or gas overheating with zero requested flow rate. Venting the gas to the atmosphere can, for example, prevent activating slam-shut valves for temporary causes not related to damaged reducers. Obviously the amount of gas discharged depends on the extent of the overpressure in relation to the setting. These safety devices operate on the principle of comparison between the thrust on the diaphragm or piston deriving from the pressure of the gas to be controlled, and the thrust deriving from the setting spring. Of course the weight of the mobile unit and the static and dynamic residual thrust on the cocked plug also influence the comparison When the thrust deriving from the gas pressure exceeds that of the spring, the plug is raised and a certain amount of gas is discharged; otherwise the plug is released and it closes the valve seat due to the sole effect of the pressure of the gas being controlled, not because of the setting spring. This means that the cocked plug cannot be damaged by any incorrect operation of the setting-adjustment nut.

Marking and References to Standards
See description
Fluids
Non-aggressive gases in the 3 gas families (dry gases)
Conn.IN
DN25
Conn.OUT
DN25
Max pressure(Bar)
1
Attacco
threaded
Operating temperature
-15° +60°C
Range di pressione
30÷110mbar
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