I have a question regarding the air-on and air-off functions of the emergency shut-off valve
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Is the natural gas emergency shut-off valve of the heating furnace air-operated or pressure-operated? Regularly reduced-bottom emergency shut-off valve? Emergency cut-off valve for the pressure-reduction side line?
In an emergency, to cut off the flow, open the wind valve; when there is no wind supply, close it.
In the event of an emergency shutdown, it should be closed during accident conditions or when the purge air supply is stopped; it is a air-operated valve, and its use is primarily driven by considerations related to equipment and process safety
Is it all just wind? The heating furnace definitely, and the bottom of the tower as well?
1. Wind on 2. Wind on 3. Wind on
Since it’s an emergency shut-off, it means the gas is turned off
It should all be wind-operated valves; the fundamental principle behind their design is to ensure the safety of the entire process system by determining the position of the valves in emergency situations.
They are all cut-off valves; they must be operated by air to open and shut in case of a fault
The fuel gas to the heating furnace should be turned on by air supply; it should be turned off in the event of an air supply failure to prevent the heating furnace from overheating； The normal position should be closed by a valve; in the event of an accident, it should remain open to prevent the feed to the vacuum furnace from being interrupted and causing the furnace tubes to overheat ； The bottom reduction is controlled by the wind system, in order to prevent accidents caused by the evacuation of the liquid level in the pressure reduction tower under abnormal conditions ； The side line should also be equipped with a wind shutdown valve; under normal operating conditions it enables heat extraction, thereby preventing excessive temperatures from occurring inside the tower.