Position indicator and locking mechanism: Since the fluorine-lined valve is a soft seal, in order to avoid damage to the sealing surface when the valve is closed due to excessive operating torque. Therefore, the requirements for position indicators (such as gate valve
s, globe valve
s, etc.) are added to the design. Since most of the media used in fluorine-lined valves are strong corrosive, toxic and harmful substances, in order to avoid accidents, provisions for locking mechanisms have been added to meet the different needs of users. Design requirements for valve stem retention: The valve stem should be designed with an anti-spray mechanism to prevent the valve stem from being sprayed out under internal pressure after the valve stem packing or sealing ring is removed. Such provisions are mainly because the media used in fluoroplastic lined valves are mostly strong acids, strong alkalis, highly toxic and harmful substances. If the valve stem is ejected, it will cause serious consequences. In order to increase safety and reliability, the valve stems of fluoroplastic lined gate valves and globe valves are required to have an inverted seal design, and the valve stems of fluoroplastic lined ball valves, butterfly valves and plug valves are required to have an anti-blowout design structure.
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