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Safety valve model compilation method 1. Safety valve model compilation method http://www.fspv.com/imge/model01.gif 2. Safety valve connection form code Connection form code Connection form code Internal thread 1 Pair clamp 7 External thread 2 Clamp 8 Flange 4 Clamp 9 Welding 6 3. Safety valve structural form code Structural form code Spring closed with radiator full-open type 0 Micro-open type 1 Full-open type 2 With wrench Full-open type 4 Unclosed double-spring micro-open type 3 Full-open type 8 Micro-open type 7 With control mechanism Full-open type 6 Lever Single lever full-open type 2 Angular micro-open type 5 Double-lever full open type 4 Pilot type 9 4. Valve seat sealing surface material code Valve seat sealing surface material code Valve seat sealing surface material code Copper alloy T Ammonia-infiltrated steel D Rubber: When the valve seat and valve body sealing surface materials are different, the low hardness material code is used. 5. Nominal pressure code of the safety valve The nominal pressure code is expressed in Arabic numerals, and its value is 10 times the nominal pressure value in megapascals (MPa). When marking the working temperature and working pressure, the working pressure must be marked with P and the maximum temperature number of the medium must be appended to the lower right corner of the P word. This number is an integer obtained by dividing the maximum temperature value of the medium by 10. like: The valve with an operating temperature of 540°C and a working pressure of 10MPa is coded P54100. 6. Safety valve body material code Valve body material code Valve body material code Gray cast iron H Carbon steel C Ductile iron Q Chromium-molybdenum alloy steel I Chromium-nickel-titanium steel P Chromium-molybdenum vanadium alloy steel V Note: For gray cast iron valve bodies with PN ≤ 1.6MPa and carbon steel valve bodies with PN ≥ 2.5MPa, this code number is omitted.