Pumping stations in wastewater treatment plant (WWTP) systems often use submersible pumps, which can lead to air pockets at changes of gradient and to water hammer. Air valves must be correctly installed in the system to avoid these problems, especially the models fitted with CSA AS and RFP technology, since rapid filling helps to remove the air.

Once again installation is a key factor. In the diagram shown we suggest the correct installation of wastewater air valves (SCA) placed upstream of the check valves, in combination with a large capacity surge vessel to ensure reliable protection against unexpected pressure rises.

Additional maintenance considerations:

• Fit isolating valves for maintenance work (UNIWAT resilient seated gate valves)
• SCA air valves have two bodies, which makes servicing easier.
• Ducted top outlet to avoid bad smells.
• PN 16 body design pressure with stainless steel internals to guarantee a long service life in the plant.