Capacity regulations require that a three-way cock or needle valve should be installed when installing a pressure gauge.
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Last year's annual supervisory inspection meeting said that this year we will increase the supervision of pressure pipeline components and crack down on unlicensed products. I would like to ask what this three-way cock has.* * There is no standard specification for it, and I can't find it. How is its function implemented?
If it is a boiler, you will need to install a water storage elbow.