What material is the sealing ring of a hard-sealed low-temperature butterfly valve made of?
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We specialize in low-temperature butterfly valves, where the seal ring is installed on the butterfly disc to form a sealing pair with the valve seat. The butterfly valve with a flange features a fixed valve seat, with inclined surfaces machined on the valve body and hardened. The seat of the welded butterfly valve is a movable seat, with the seat inclined surface hardened. In the past, multi-layer seals were used, consisting of 304 steel with graphite plates; however, recently customers have requested that the seals be made of pure metal, specifically solid stainless steel. Generally, valve seats are surfaced with STL. Do you know what material would be suitable for the sealing ring and what surface hardening method is best to use?
This post was last edited by CHANGBAISHI on 2021-12-18 08:15. I saw hard-sealed ones before. But the leakage rate is too high to continue using it. In other words, it does not apply. It gets damaged and scrapped at the slightest impurity. Ideally, it would be best if the valve opening could be changed from fixed to a replaceable screw type. There are also the operating conditions; damage has occurred due to ordinary metal wound gaskets breaking, which allowed fluids to carry metal wires into the valve. It is recommended to understand the reasons for requiring a hard seal, as this will help in resolving the issue; for reference only.