i have customer asking me ,if seat material for ball valve or gate valve nylone is good for crude-oil service. The answer would be depending on temperature, pressure, ball-valve size and ball-valve construction. And: not at least fluid. Crude oil could be anything from fairly refined, clean and free from particles and easily flowing at normal surrounding temperature to something you could walk on, filled by sand, and requiring 100 deg centigrade or more to flow.Nylon is a trade-name. My first choice would have been carbon reinforced PTFE (Trade-name'Teflon') for normal, clean crudeoils at normal processing temperatures, moderate diameters and pressure classes.

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