Bellows gate valve
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Which teacher has a good understanding of bellows gate valves? For example: do they feature a \"dual-seat structure for two-way sealing\"”； Can the pressure inside the valve chamber be released automatically? ； Besides bellows and packing seals, are there also hard seals for valve sealing? Is there generally a grease seal? Thank you.
Bellows gate valves are not necessarily of a \"double-seat structure with two-way sealing\"”； Whether to choose a “dual-seat structure with two-way sealing” depends on the properties of the medium. The pressure inside the valve chamber cannot be released automatically. The bellows and packing seals in valve sealing refer to the sealing methods of the valve cover. There are also extended versions, high-temperature versions, self-sealing versions, and so on. There is no hard seal in the valve cover seal. Generally, hard sealing refers to the valve seat.
Okay, thank you. The bellows gate valve is used with heat transfer oil at a temperature of 260 degrees – should a hard seal for the valve seat be considered? “Does \"Co-based cemented carbide surfacing on the sealing surface\" constitute a hard seal? And are bellows gate valves unidirectional?