DESCRIPTION AND INSTALLATION The ASTRA Accelerator is an accessory device used on large dry pipe systems to hasten dry valve operation. NFPA Pamphlet 13 requires that each standard dry valve controlling a system with a capacity of more than 500 gallons must be provided with an accelerator. In a fire condition, the accelerator redirects air pressure from the system piping into the intermediate chamber of the dry pipe valve. This air pressure assists the water pressure to overcome the pressure differential and opens the dry pipe valve.
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