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GW - Model C300 -Fluid Control Valve Sprinkler Pressure Reducing
This valve is designed to supply water at constant pressure to a wet automatic sprinkler system. It is typically used where zones with automatic sprinkles shall operate at a lower pressure than provided by the fire pump. The C-300 sprinkler valve has a built in non-return facility which prevents backflow if the valve inlet pressure suddenly drops. When the C-300 valve opens as caused by activated sprinkler heads, an alarm signal by water pressure can activate an alarm gong or pressure switch.
This valve is fitted into a fire water supply to provide a regulated downstream pressure to automatic sprinkler heads in a wet sprinkler system. Upon operation the valve provides an alarm, typical via a pressure switch connected to the alarm port (TP5).
The GW C-300 sprinkler valve is “self-powered” – and utilizes the system upstream (inlet) pressure to regulate and maintain downstream pressure in line with the pre-determined set-pressure.
The valve principle is “elastomeric sleeve type” where the annular valve orifice is adjustable by expansion/contraction of the rubber flow sleeve.
Under operational conditions, the initial pressure drop in the downstream pressure, caused by the operation of one or more sprinkler heads, is sensed by the valve pilot, causing it to open the alarm port and by-pass ports. The water surrounding the elastomeric flow control sleeve is hereby drained to downstream, allowing the flow sleeve to lift from the seat, and open the GW C-300 sprinkler valve.
As the downstream pressure increases, the pilot valve operates to regulate the by-pass port and the elastomeric sleeve pressure becomes balanced to provide a constant valve orifice for the flow conditions.
Any change in the flow condition /downstream pressure, i.e. more sprinkler heads opening, is sensed by the pilot causing it to release more pressure from the sleeve cavity thus increasing the valve orifice to supply more flow.
The GW C-300 sprinkler valve will constantly continue to monitor the downstream pressure and adjust the valve orifice as long as water is supplied to the system. The check valve connected externally across TP2 and TP4 ensures that the GW C-300 sprinkler valve will remain closed in the event of an upstream water supply failure.