RWJ Corporation  
 

 

[Under Construction]

Main

Contacts

FAQ & Comments

Definitions

Map

News

Memorial

TERMS and DEFINITIONS

 

Backflow Preventer - a device that is installed before all others on an incoming water line that allows the supply water to enter the system but keeps the system water from flowing back into the water supply.  These units are mandated by the EPA and all municipal water departments.

Deluge System - A deluge system utilizes a valve that is opened when detectors in the same area as the sprinklers are activated.  The sprinkler heads have no thermal element and are always open.  When the system activates, water flows from all sprinkler heads.

Dry System - A dry system is one that has the water held back at the system riser usually by air pressure.  When a sprinkler head opens, the air escapes and allows water to enter the system piping.

Preaction System - In a preaction system the water is held back by a valve that is opened when one or two detectors in the same area as the sprinkler heads are activated.  The detector activation allows water to enter the system piping.  When the thermal element of the sprinkler head is activated then water will flow from that particular head or heads.

Two-Holed  -  Two holing a flange of an incoming water line means that two of the bolt holes are parallel with the wall if the incoming water supply enters through the floor or parallel with the floor if the water supply enters through the wall.  This allows the system riser to be installed parallel with the wall and/or the floor.

Wet System - refers to a sprinkler system that has it's piping full of water at all times and can only be installed in areas that maintain heat above 40 degrees.

 

Send mail to webmaster@rwjsprinkler.com with questions or comments about this web site.
Last modified: 08/31/06