The markings on the valve!
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There are markings on the valves regarding them! Pressure, flow direction, material. May I ask how to convert the pressure indicated by LB for a valve into MPa? Also, could some expert tell me what the material codes indicated on valves mean?
150LB is equivalent to 2.0MPa, 300LB is equivalent to 5.0MPa, 600LB is equivalent to 11.0MPa, 900LB is equivalent to 15.0MPa, and 1500LB is equivalent to 26.0MPa； 2500LB is equivalent to 42.0MPa ；
May I ask if the valves you saw are domestic or imported? Imported valves are usually specified using ASTM standards. They can also be classified as cast or forged; taking cast valves as an example, carbon steel valves use ASTM A216, while stainless steel valves use A351 CF8M (316SS) and A351 CF8 (304SS). High-temperature steel valves use standards such as A217 WC6 and A217 WC9. Valve specifications generally follow the MSS SP-25 standard, which can be found online
The material indicated on the valve refers to the grade of the material used for the valve body (that is, the material of the valve casing)
Could you explain what the characters on the gate valve mean?