... the cam effect to realize theno-friction contact between seat and sealing ring of disc during the 90° travel of valve, thus ... toavoid the probability of wear and leakage.; when closing the valve, the ... ,CF8,CF8M,316L DiscWCB,CF8,CF8MStem310S,304,316LPackingPTFE, graphite Sealing ring CGM,316LFluid temperatureHigh temp. 1200~+450°CHigh temp. 2400 ~ +580 ...