ASSE 1012 Specified|CSA B4 Certified

The Series 9D dual check backflow preventer with intermediate atmospheric vent can be used under continuous pressure. The primary check valve uses a rubber disc seating adjacent to a mating rubber part to ensure tight closing. A second check valve employs a rubber disc-to metal seating. If fouling of the down stream check valve would occur, leakage would be vented to the atmosphere through the vent port to safeguard the potable water system. The Series 9D dual check valve is furnished with union connections to facilitate removal and replacement for maintenance. The internal part is stainless steel. The line size construction permits the check modules to open further allowing debris to move easily reducing check fouling. The minimum working pressure required is 25 psi (172 kPa) and the maximum working pressure is 175 psi (12.06 bar) The check valve is third-party certified by ASSE 1012 and CSA B4. The inlet and outlet sizes are 1/2 in NPT. The body of the valve is made of brass, while the internal parts are stainless steel. The check valve assemblies are durable and include tight sealing rubber. The dual check valve with intermediate atmospheric vent is threaded for 1/2 in female NPT to allow backflow to be directed to a drain. The valve can be installed vertically or horizontally.