Preaction 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

Model G Preaction Systems
Single Interlocked – Pneumatic Release
Single Interlocked – Electric Release
Preaction System Single Interlock Electric Release

When the detector (1) is activated, a signal is sent to the VFR-400 release control panel (2). The panel sends appropriate alarm signals, and at the same time, signals the release of the solenoid valve (3). When the solenoid opens, the priming water is relieved from the internal prime chamber assembly (4). The prime chamber assembly collapses, and water passes through the G series valve and internal check diaphragm (5). The water enters the system piping, but until a sprinkler (6) activates no water is discharged. When the valve operates, pressure opens the pressure operated relief valve (PORV) (7) continuously venting the water to the priming chamber, ensuring the deluge valve remains in the open position.
Double Interlocked – Pneumatic/Pneumatic Release
Double Interlocked – Electric/Pneumatic Release
Preaction System Double Interlock Electric/Pneumatic Release

When the detector (1) is activated, a signal is sent to the VFR-400 release control panel (2). The panel sends appropriate alarm signals, and at the same time, signals the release of the solenoid valve (3). The deluge valve will NOT open until a sprinkler (4) opens. When a sprinkler opens, supervisory pressure in the sprinkler piping is reduced causing the pneumatic actuator (5) to open. After BOTH the electric detection system activates AND supervisory pressure in the sprinkler system have been lost, pressure is released from the priming chamber (6) of the deluge valve, allowing the valve to open. When the deluge valve operates, pressure opens the pressure operated relief valve (PORV) (7)continuously venting the water to the priming chamber, ensuring the deluge valve remains in the open position.
Double Interlocked – Electric/Pneu-lectric Release
Components and Accessories (general)
Accessories (Pneumatic Release)
Accessories (Hydraulic Release)
Accessories (Electric Release)
Alarm Devices
Special Valves and Trim