Key and main items for the quality grade assessment of safety valves, pressure relief valves, and steam traps

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Key and major items for the quality grade assessment of safety valves, pressure reducing valves, and steam traps ①② Key and major items for the quality grade assessment of safety valves, pressure reducing valves, and steam traps ①② Safety valves, Pressure reducing valves, Steam traps: Shell testing △Shell strength △Shell testing △Sealing test △Pressure regulation performance △Operating performance △Deviation from set pressure △Pressure characteristics △Holding pressure test ④△Discharge pressure △Flow characteristics △Volume of hot condensate discharged △Opening height △Quality of castings △Air leakage rate △Mechanical characteristics △Continuous fault-free operation △Air discharge capacity △Repeatability of operation △Sealing performance ○Quality of castings △Pressure difference for opening and closing △Cleanliness of internal cavity ○Continuous fault-free operation △Spring ③△－－Maximum operating pressure ○Quality of castings △－－Minimum operating pressure ○Cleanliness of internal cavity ○－－Maximum operating backpressure ○Discharge volume ○－－Maximum degree of supercooling ○－－－－Cleanliness of internal cavity ○－－－－Residual amount of gating residues ⑤○－－－－Residual amount after welding repairs ⑥○①△ denotes key items; ②○ denotes major items. ③Applicable to spring-loaded safety valves. ④Applies to components of traps that are subjected to external pressure, such as the ball in float-type steam traps. ⑤ and ⑥ apply to mechanically operated steam traps with sealed floats. This is information that should be known during on-site inspections; I hope everyone will take a look so that we can do a better job in protecting our equipment! ~~