Pressure Reducing Valve (PRV) - Flanged Pilot Operated
Part Number: PRVNGE
The PRVNGE Pressure Reducing Valve from Arrow Valves is designed to provide a constant outlet pressure despite varying inlet pressures. The outlet pressure is adjustable between 1.0–5.3 bar as standard – other ranges available. The inlet pressure must be higher than the desired outlet pressure. The outlet pressure can be adjusted at any time by removing the tamperproof cover on the pilot valve and rotating the hexagon screw. Turn clockwise to increase the pressure.
The PRVNGE is pilot operated, which has many advantages over direct acting, including –
· Accurate down stream pressure characteristics
· Compact, with no large springs
· Controllable, ancillary pilot valves control main valve
Two pressure gauges are supplied with each PRV, which indicate the supply and outlet pressure. Gauge isolating valves are provided for extra security (use as drain tap with gauge removed). The valve is configured with the gauges visible for flow left to right. This can be reversed if required. Horizontal installation is recommended but vertical configuration is permissible due to the light moving assembly.
A reinforced diaphragm is used rather than a piston - overcoming stiction problems. The pilot system controls the pressure above the diaphragm, which controls the main valve. Upstream and downstream Servicing Valves are strongly recommended to avoid draining for maintenance – e.g. resilient seat Gate Valves as supplied by Arrow Valves.
Where indicated on the drawing, a Pressure Reducing Valve shall be fitted – model PRVNGE - as distributed by Arrow Valves Ltd – Tel 01442 823123 www.arrowvalves.co.uk. The unit shall be a globe type pilot operated pattern and have an adjustable outlet pressure ranging from 1.0 – 5.3 bar and have a maximum supply pressure of 16 bar (PN16) or 25 bar (PN25). The seat shall be stainless steel. Two pressure gauges shall be provided to indicate the downstream pressure. The body shall be epoxy coated ductile iron.
• Reducing excessive mains pressure
• Controlling pump outlet pressure
• Pressure regulation per floor
• Water conservation