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Does the DDX deluge valve require a check valve for preaction system applications?

April 26, 2017applications ddx deluge preaction require system valve

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Does the DDX deluge valve require a check valve for preaction system applications?

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No, the DDX utilizes an intermediate chamber in its seat design, which separates the inside of the valve body with the alarm outlet piping which is open to atmosphere. Therefore, supervisory air pressure can fill the valve body and the system piping without separation by a riser check valve.