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![Unidirectional tightness Unidirectional tightness](https://www.syveco.com/media/catalog/category/unidirectionaltightnessknifegatevalves_ok.jpg)
Unidirectional tightness
Unidirectional tightness knife gate valves have only one seat and are tight in only one flow direction as a result.They are stop valves used to close networks containing loaded liquids or powders.