Check valve model
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How to distinguish the models of lift check valve, swing check valve and butterfly check valve? What do H74H-25, H41H-16/25, H41W-16/25, H44H-16/25 HH48X/H-10/16/25, DHH44H, HH44Z/X, etc. mean respectively? Is there a more detailed introduction?
H74H-25-- 2.5MPa wafer check valve H41H-16/25 1.6MPa/2.5MPa swing flange check valve refer to JB308-75 "Valve Model Preparation Method"
H74H Wafer single-disc check valve H41H/W Horizontal lift check valve H means the sealing surface is surfacing 13Cr W means the sealing surface is the body H44H Single-disc swing check valve is more commonly used HH48X/H Slow-closing empty discharge check valve X means the sealing surface is rubber H as above DHH44H Low temperature slow-closing swing check valve HH44Z/X Slow-closing swing check valve Z may represent gray cast iron
Compare this to JB/T 308-2004 Valve Model Preparation Method