Installation requirements for closed-eye valves
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Why are cut-off valves installed before and after the closed-eye valve on gas pipelines, and why is a pneumatic valve added after those cut-off valves?
““Glasses valve” is a local term. His real name is “blind plate valve”. Given the flammability, explosiveness, and toxicity of gas, pneumatic valves are installed to enable remote control of the production volume as needed. The butterfly valves on both sides are primarily used for the maintenance and replacement of the blind valves. For reference.
Are there any regulations regarding the installation of shut-off valves before and after the closed-eye valve?