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Mechanical construction - 1. Pre-action fire sprinklers are a dry sprinkler system, water is not contained in the pipes but is held back by a pre-action valve. Pre-action valves are electrically operated
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PreAction Sprinkler System
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DV-5A Double Interlock Preaction System, Type A - Preaction Systems - Deluge & Preaction Systems - System Valves & Devices - Products | JCI Webshop
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H Double Interlock Preaction System Type D – Electric/Electric | Reliable Sprinkler