Electro-Pneumatic ON/OFF Deluge Valve VD/D/EP

Electro-Pneumatic ON/OFF Deluge Valve VD/D/EP supplied by SA Fire Protection

The valve Mod. VD/OF/EP is a deluge valve ON/OFF with electro-pneumatic actuation and remote reset, available in diameter sizes from 2” (DN 50) to 10” (DN 250).

The deluge valves ON/OFF Mod. VD/OF/EP are used to control water or foam/water flow in water spray or foam fire protection systems monitored by electric fire detection system. The control trim is also provided with a connection for an optional pneumatic heat detection line, for the pneumatic activation of the deluge valve. When equipped with the relevant accessories (pressure switch, water motor alarm), they can provide actuation of fire alarms upon system operation.

In normal operating conditions the deluge valve ON/OFF electro-pneumatic VD/OF/EP is held closed by the water pressure in the control chamber. In fire conditions water is released from the control chamber through the opening of the solenoid valve in the control trim, and the valve latches open under the effect of the water supply pressure. The valve can be manually open through the emergency manual release on the control trim. The trim is also provided with a connection for an optional remote emergency manual release line and another connection for an optional remote air control line. The valve can be remotely reset closing the solenoid valve. The deluge valve ON/OFF electro-pneumatic is recommended for those applications where it is preferable to keep the solenoid valve dry, such as those with sea water or foam concentrate.

The deluge valve ON/OFF electro-pneumatic Mod. VD/OF/EP is available in vertical or horizontal configuration. The cover plate allows in-line maintenance and field replace of the diaphragm to be performed.

Principle of operation

In normal operating conditions (valve closed) the water is supplied to the priming chamber through the trim. The pressure of the water trapped in the priming chamber holds the diaphragm on the valve seat, keeping the valve closed.

The control trim comprises a water line held closed by the pneumatic actuator and the emergency manual release, and an air line held closed by the solenoid valve.

In fire conditions (valve open) the opening of the solenoid valve via remote signal allows the discharge of the air line and the subsequent opening of the pneumatic actuator, releasing the pressure from the priming chamber. The water supply pressure in the inlet chamber forces the diaphragm off from seat, allowing water to flow into the system and the alarm devices. Alternatively, the deluge valve can be opened locally through the emergency manual release.

A restriction orifice in the air line reduces the air inlet compared to the internal passage of the solenoid valve, allowing the opening of the pneumatic actuator. A restriction orifice in the water line reduces the water inlet compared to the internal passage of the pneumatic actuator, allowing the opening of the priming chamber.

Items:

Deluge valve
Gauge isolation valve
Water pressure gauge
Y strainer
Main drain valve
Water gong isolation valve
Check valve
Solenoid valve
Emergency Manual Release
Priming valve water trim
Manual vent valve
Restriction orifice water trim
NO alarm isolation valve
NC alarm test valve
Alarm line drain valve
Air pressure switch low pressure
Pneumatic actuator
Priming valve air trim
Alarm line water pressure switch
Restriction orifice air trim
Air pressure gauge

The materials of construction make it suitable for being used with sea water or water foam solution within industrial harsh environments & offshore applications.