Regarding the issue of cold brittleness of valves at low temperatures?
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The material of the valve body is WC6; according to the specifications, its minimum operating temperature is -29°C. If the valve’s pressure rating is PN63 and it operates at a pressure of 4 MPa, with the gas temperature in front of the valve being -40°C, will the valve be damaged due to the low temperature, assuming no other stresses are present?
WC6 is a high-temperature resistant cast alloy steel; it’s not suitable for low-temperature applications. For low temperatures, LCB or CF8 are generally used. But if you do use it, there won’t be much of a problem – the temperature isn’t that low after all
WC6 materials are highly brittle at low temperatures, which poses safety issues with long-term use; valve bodies may crack, and low-temperature stress cracks can occur, creating safety hazards.
This post was last edited by liqh014 on 2017-9-16 at 19:37. The usage time each time ranges from 1 to 10 minutes, and the number of uses per year is likely no more than 100. Personally, although there are safety concerns, short-term use should not pose a big problem.