This Appraisal is for Bermad C10 and C30 plastic bodied combination (double orifice) air valves in sizes DN 50 and DN 80 manufactured to AS 4956:2017 Air valves for water supply.
The DN 50 valves have a 2” BSP threaded connection and the DN 80 valves have a DN 80 flanged connection with multiple drillings, one complying with the mating dimensions of AS/NZS 4087 Fig B5 PN16.
The valves allow for evacuation of air during pipeline filling, large volume air intake in network draining and protection against air accumulation and vacuum formation at elevations, slope change points and road/river crossings during operation.
Options are available for surge protection (to prevent damage to the valve and the system) or inflow prevention (to prevent intake of atmospheric air which may cause damage to pumps or disruption to syphons).
The C10 air valves have a pressure classification of PN12 and the C30 air valves have a pressure classification of PN16.