Due to the variability of gas consumption, the pressure of the gas distribution network must be kept constant and in a certain value. This is done by the regulator in the gas pressure reduction stations.
Any malfunction of the regulator will increase the downstream pressure of the regulator and this will cause serious damage to the equipment of the station and distribution network, so the need for safety equipment to control the allowable pressure range is inevitable. (Shot of Valve)
Shot off valve
Two devices are used to protect the downstream part of the regulator:
1- Safety valves
2- Cut-off safety valves
The safety valves act as soon as the pressure increases up to 10% of the working pressure of the downstream part of the regulator and prevent the increase of the station pressure by venting the gas. The station returns to normal.
Shot Off Valve
If the safety valve is not able to control the pressure and the increasing pressure trend continues as soon as the downstream pressure of the regulator reaches 20% above the operating pressure, the gas path should be cut off as soon as possible and the increasing pressure process should be stopped. Done.
The shut-off safety valve has a control panel that constantly checks the pressure downstream of the regulator, and if the pressure reaches an unauthorized value through the command to the actuator, closing the ball valve causes the gas line to be cut off quickly and completely.
On the other hand, if in industrial consumers such as power plants and refineries, etc., due to the downstream pressure of the regulator and consequently the pressure of the internal gas distribution network of the industrial unit is reduced, the performance of consumer equipment is disrupted and if it continues This process should be cut or TRIP as soon as possible. This is also done by the breaker safety valve.
Shot Off Valve
In other words, by adjusting the circuit breaker safety valve at the minimum and maximum pressures, if the pressure exceeds these minimum and maximum values, the command to cut the line quickly is issued by this important safety device.
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