Dry valve systems

Marine Dry valve sprinkler systems are usually installed at the request of the Ship’s owner, or to meet the requirements of Lloyds Register of Shipping, the Marine Safety Agency and IMO Solas.  These systems are permanently charged with air in readiness for a fire emergency.

When the system is set is charged with air, the minimum air pressure includes a safety factor to prevent potential water pressure fluctuations from the water storage tank forcing the Dry valve clack open to allow water into the system pipework.

An accidental loss of air pressure will initiate a low air pressure alarm to alert the ship’s crew to the situation. A rapid loss of air pressure through an operated automatic sprinkler in response to heat from a fire will allow the water pressure within the Dry valve to overcome the differential holding the clapper assembly closed. This allows the clapper assembly to open and allow water to be discharged into the pipework system and be discharged through any open sprinklers.

When there is a steady flow of water into the system that is equivalent to the discharge rate of one or more sprinklers, electric, and/or hydraulic alarms will be initiated.

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