DMP company produce air poppet valves for plastic injection mould industry, products are made of antirust material of sus420, X4Cr13Ku,1.2083,1.4034 per DME,MISUMI,CUMSA.spring origin in U.S can adopt temperature from 220-260℃.working atmosphere from 1.5-6 bars.Hardness: HRC48-54.
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