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Temperature limit of sheroidal graphite cast iron valves and PED certification

Temperature limit of sheroidal graphite cast iron valves and PED certification

Temperature limit of sheroidal graphite cast iron valves and PED certification

(OP)
Hello,
I have a simple question.
I know that many valves (gate, butterfly...) are casted in spheroidal graphite GJS 400-15 that is limited to -10°C but in the data sheet and PED certificate are marked up to -20°C. How is it possible?

RE: Temperature limit of sheroidal graphite cast iron valves and PED certification

I am afraid you will have to give the exact details (datasheet for the valve and regulation/text) before you will get an answer.

RE: Temperature limit of sheroidal graphite cast iron valves and PED certification

(OP)
Many regulation like EN 12516-4 or EN 15776 indicate as low temperature limit for GJS 400-15 or GJS 450-10 -10°C. Many manufacturers of butterfly and gates valves indicate as low temperature limit -20°C. In Europe there is PED (pressure equipment directive) and use of material below the temperature indicated in the regulation must be justified. My question is easy: how can be use a casted spheroidal graphite below temperature limit?

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