Safety shut-off valve
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Safety shut-off valves are used in the loading and unloading pipelines for various fluids such as chemicals, petrochemicals, and gases. When loading or unloading products from vehicles or ships, it sometimes happens that the vehicle drives away accidentally or the ship drifts, and if the operator fails to disconnect the pipeline due to error, this can lead to damage to the equipment and subsequent leaks. The safety break valve functions like a fuse; if the pipeline is subjected to unexpected pulling forces, the break valve will break under stress and split into two, thereby protecting the pipeline.
I learned about this type of valve for the first time; it’s interesting!
May I ask which document or standard contains this statement?
A safety shut-off valve is a device that automatically disconnects under certain external forces, with both sections after disconnection possessing self-sealing capabilities. This device is installed on the hoses of fueling or gas filling stations, as well as on gas filling (unloading) columns; it is a specialized protective device designed to prevent the hoses from being torn and causing leakage accidents.
The breakaway valve (emergency disconnect device) prevents leakage accidents caused by accidental rupture of hoses, and is suitable for applications such as shore unloading at ships, tank loading and unloading on roads and railways, as well as in other fixed and mobile fluid storage systems, including connections between dip pipes, fluid transfer arms, and transport vehicles. The emergency release coupler in emergency disconnect systems ensures the highest level of safety during fluid transfer in both marine and land-based flexible hoses. Thanks to a simple yet unique design, when the flexible hose exceeds the maximum allowable volume for the control and shut-off valve system, this system can automatically and safely disconnect within the hose without any leakage. Its advantages are ensuring activation in the event of a hazard, instant valve closure, minimal dripping, and relatively low pressure loss. The breaking mechanism must ensure that the equipment can disengage automatically and quickly in the event of an \"emergency disengagement\" ； It is also necessary to ensure a \"buffer period\" before disconnection, in order to avoid disconnection during normal operations and prevent disruptions to regular loading and unloading activities.
Breakaway valves are described in the safety inspection regulations for mobile pressure vessels, and the second item refers to breakaway valves
The emergency disconnect system ensures the highest level of safety in fluid transfer in marine and land-based flexible hoses. Thanks to a simple yet unique design, when the flexible hose exceeds the preset load limit set by the operating system, the breakaway valve installed on it can automatically and safely disconnect, instantly sealing the break surface.