Preaction system

What does preaction mean? Pre-action fire sprinkler systems employ the basic concept of a dry pipe system in that water is not normally contained within the pipes. The difference, however, is that water is held from piping by an electrically operated valve, known as a pre-action valve. But rather holding water from piping via pressurized air or nitrogen, pre-action sprinkler systems restrain water with an electrically operated valve, known as a pre-action valve. To order a Model E or Model F deluge or preaction system , first select the desired deluge valve and the appropriate deluge valve trim.

Next, choose a releasing trim and releasing device(s) depending on your application.

Reliable is one of the world’s largest producers of automatic fire sprinklers and sprinkler system control equipment. The DV-5A offers improvements on the DV-valve while keeping the original key features. A double interlock system has two events that must occur: 1) fire detection from a heat or smoke detector and 2) automatic sprinkler operation. Once one of the above occurs, the pre-action valve operates, allowing water into the system piping , essentially turning a dry system into a wet system.

A fire sprinkler system is an active fire protection metho consisting of a water supply system , providing adequate pressure and flowrate to a water distribution piping system , onto which fire sprinklers are connected. Although historically only used in factories and large commercial buildings, systems for homes and small buildings are now available at a cost-effective price. Fire sprinkler systems are extensively used worldwide, with over million sprinkler heads fitted each year.

Pre-action sprinkler systems are specialized for use in locations where accidental activation could damage high value physical assets as in archival vaults, museums, libraries or data centers. Similar to a dry-pipe system , a pre-action sprinkler system uses piping charged with air or nitrogen under pressure.

Our preaction systems are activated once it detects a previous event like a smoke or fire alarm. Select the type of system required on your project ( preaction , deluge, dry, etc). Choose the style of system required (skid mounte remote controlled or self-contained) and its release system (electric, pneumatic, etc.). The preaction system valves, panel, indicators must be installed in a readily visible and accessible location.

The system valves and accessory shall not be installed in an area having temperature less than 4oC (40oF). Heat tracing to system valve and accessory is not permissible. A supplemental detection system (release line) is installed in the same area as the sprinklers. Actuation of the fire detection system from a fire opens the deluge valve, allowing water to flow into the sprinkler piping system and to be discharged only from those sprinklers that have been operated by heat over the fire. In a pre-action system the piping is pressurized with air or nitrogen, monitoring of this air pressure provides a means of supervising the system piping.

Loss of the supervisory air pressure in the system piping in a trouble signal at the alarm panel. Pre-Action Sprinkler Systems. First, the detection of fire from a heat or smoke detector and secon the automatic sprinkler operation. Once both actions have occurre the pre-action valve operates which allows water into the system piping. Preaction Fire Protection Systems.

In order to download a DWG file or PDF file to your hard drive, right click on the link and Save target as. Click here to download this entire section, or select specific data sheets in the list above. Pre-action systems are hybrids of wet, dry, and deluge systems, depending on the exact system goal.

There are two main sub-types of pre-action systems: single interlock, and double interlock.

Automatic sprinklers are required in all compartments of completely sprinklered buildings as defined in NFPA 13. When one of these events occurs, the system activation valve goes into a preset position. When the second event occurs, the valve opens, and water enters the system. Water does not enter the system until both events occur.

These two events can occur in any order and result in the same outcome.