This Appraisal is for a range of Bermad C50 and C80 metallic bodied combination (double orifice) air valves, in sizes DN 50 to DN 100.
The C50 air valves are available with ductile iron or Grade 316 stainless steel bodies and are generally utilised on pipelines up to DN 450, depending on pipeline topography and hydraulic characteristics. The ductile iron bodied C80 air valves offer a significantly higher air flow capacity than the C50 design and are well suited for sizes up to DN 600.
The air valves are suitable for sewer and wastewater applications in pump stations, pipelines and treatment plants. The valve evacuates air during pipeline filling, allows release of air pockets from pressurized pipes and enables large volumes of air intake in the event of network draining. The elongated body and lower float are designed to reduce contact between the fluid and the upper mechanism
The valves are available with an optional anti-slam device for surge protection or inflow prevention device to prevent intake of atmospheric air in cases where damage to pumps or disruption of siphon is possible.
The PN 16 valves are available with flanges to AS/NZS 4087 Figure B5 (AS 2129 Table D for DN50) or with a BSP threaded connection.