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What Does double block and bleed valve Mean?

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We only have one particular part to generally be purchased, not numerous as inside the aged programs, that may conserve on stock and web-site confusion. API 6D defines a double-block-and-bleed valve (DBB) as being a “one valve with two seating surfaces that, from the closed place, presents a seal against http://flarelessfitting20629.jaiblogs.com/14099259/double-block-and-bleed-valve-an-overview

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