Electro-Pneumatic ON/OFF Pressure Regulating Double Chamber Deluge Valve VDD/RPOF/EP

Electro-Pneumatic ON/OFF Pressure Regulating Double Chamber Deluge Valve VDD/RPOF/EP supplied by SA Fire Protection

The valve Mod. VDD/RPOF/EP is an electropneumatic actuated pressure regulating deluge valve available in diameter sizes from 3” (DN 80) to 8” (DN 200). The two priming chambers, each one provided with its own diaphragm and control trim, provide fully redundancy improving the safety availability of the system.

The pressure regulating deluge valves Mod. VDD/RPOF/EP are used to control the pressure of water or foam/water flow for water spray or foam fire protection systems.

In normal operating conditions, the deluge valve is held closed by the control solenoid valves. In case of fire the solenoid valves will open allowing the valve to control the downstream pressure. When the solenoid valves is commanded to close also the deluge valve will return in close position.

The pressure regulating deluge valve Mod. VDD/PROF/EP is available in vertical or horizontal configuration. The two cover plates allows in-line maintenance and field replace of the diaphragm.

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

Principle of operation

In normal operating conditions (valve closed) the water is supplied to the priming chambers through the trims. The pressure of the water trapped in the priming chambers holds the diaphragms on the valve seats, keeping the valve closed.

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

Electro-Pneumatic ON OFF Pressure Regulating Double Chamber Deluge Valve VDD RPOF EP — **VALVE CLOSED**

In fire conditions (valve open) the opening of the two solenoid valves via remote signals allows the discharge of the air lines and the subsequent opening of the two pneumatic actuators, releasing the pressure from the two control chambers. The water supply pressure in the inlet chamber forces the diaphragms 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 releases on the water lines. The pressure regulating pilot valves maintain the pressure downstream the deluge valve at the set pressure.

In each trim a restriction orifice in the air line reduce the air inlet compared to the internal passage of the solenoid valve, allowing the opening of the pneumatic actuator.

During maintenance (one chamber isolated) the two priming chambers can be alternatively isolated and inspected turning the in-built isolation valves, keeping the fire protection system in service through the other chamber.

The control trim of the chamber under maintenance can be isolated closing the hydraulic bridge, allowing the maintenance procedures to be performed keeping the fire protection system in service through the other chamber and the other trim.