Selection of valve seat sealing surface width
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Having been in the valve industry for some time, I’ve always had one question: how is the width of the seat sealing surface of valves (gate, globe, and ball valves) determined? In Lu’s valve manual, it states that the value should be 1/20–1/50 of the DN. However, upon checking our factory’s drawings, I found that many of them do not follow this specification. So, what value should actually be used? I would greatly appreciate it if any experienced colleagues could provide some guidance. Thank you.
The selection of the width of the valve seat sealing surface depends on various factors, such as the type of valve (e.g., gate valve, globe valve, ball valve, etc.), operating pressure, working medium, and the size of the valve. Although the width ratio recommended in general manuals is 1/20–1/50DN, adjustments are necessary in practical applications based on specific usage conditions and design requirements. Perhaps it’s because the valves in your factory need to be adapted to specific operating conditions or have special design requirements; that’s why the dimensions on the drawings differ from the standard values. It is recommended to consult your company’s design engineers or technical experts to understand the considerations and rationale behind the specific design. At the same time, relevant standards and design specifications can also be consulted to ensure the safety and effectiveness of the valves. .