CSA air valves SUB for safety of water distribution systems
CSA SUB air valves, with threaded outlet, avoid the entrance of contaminants in the pipeline. 
Air valves and the risk of negative pressure in pipelines
Why properly sized air valves are necessary to avoid negative pressures. 
The importance of surge preventer air valves
The technologies AS and RFP of CSA anti-water hammer air valves. 
Prevention of cavitation in control valves
The CSA divices to prevent cavitation and for stability with low flow.