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An Unbiased View of double block and bleed valve

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Just upstream is a double block and bleed Valve - a trunnion-mounted Ball Valve with self-relieving seals along with a bleed Valve to vent the cavity. You close the Ball Valve and open the bleeder. Now it is possible to de-pressurize the line downstream and open it up to http://tysonpyaaa.mybloglicious.com/11673116/double-block-and-bleed-valve-secrets

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