What is the sealing anti-escape mechanism on the valve stem of a gate valve?
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What is the upper sealing anti-escape mechanism designed on the valve stem of a gate valve?
The upper seal refers to a pair of sealing surfaces formed by the conical sealing surface at the lower end of the valve cover’s shaft hole and the conical sealing surface on the valve stem; when the valve is fully open, the axial force exerted upward by the valve stem acts on these sealing surfaces to achieve sealing. The function of preventing the valve stem from escaping is provided by the conical sealing surface on the valve stem and the larger cylindrical portion below it, which serve as a limit for the valve stem.
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This one has an inverted seal; the valve stem is slightly longer than those available on the market