Dry Pipe Systems

Wet, Dry, Deluge & Preaction

There are 4 common types of sprinkler systems, Wet, Dry, Deluge & Pre-Action.

WET

Wet systems are the most common as they are the simplest of the 4 and usually require the least maintenance.

DRY

Dry systems designed for environments with freezing temperatures like walk-in refrigerators, loading docks, and warehouses. The piping does not contain any water, it is charged with air or nitrogen under pressure.

DELUGE

Deluge systems are designed for when large quantities of water are needed quickly to control a fast-developing fire.

PRE-ACTION

Pre-Action systems are hybrid dry/wet fire protection systems. They are similar to a deluge system except the sprinklers are closed. Specifically designed to protect water sensitive facilities such as libraries, data centres and museums, etc.

Subcategories

Dry Pipe System (Model G)
Dry System G Series Dry Valve Riser Assembly

When a sprinkler (1) opens, loss of air pressure in the system allows the differential valve (2) to open and relieve the priming pressure from the internal prime chamber assembly (3), opening the valve, and filling the system with water. To speed the opening of the G Series dry valve in large systems, a model E-1 accelerator (4) can be added. Water flow from the intermediate chamber of the dry valve can cause a pressure switch (5) to activate an electric alarm and/or operate a mechanical water motor alarm. When the valve operates, pressure opens the pressure operated relief valve (PORV) (6) continuously venting the water supply to the priming chamber, ensuring the dry valve remains in the open position.
Dry Pipe System (Model F)
Dry System ModelF-1 Dry Pipe Valve

When a sprinkler (1) opens, loss of air pressure in the system allows the dry valve clapper (2) to open, filling the system with water. To speed the opening of the dry valve in large systems, an accelerator (3) can be added. An integral anti-flood device protects against accelerator flooding. Water flow from the intermediate chamber of the dry valve can cause a pressure switch (4) to activate an electric alarm and/or operate a mechanical water motor alarm.
Accelerators / Air Maintenance Devices
Accessories and Components