Check Valve: Flange End Check Valve, wafter type dual plate check valve, Swing check valve, cast iron check valve 

Flang end swing check valve: 

Body: Cast iron ASTMA126 Class B 

Disc: Cast iron ASTMA126 Class B 

Bonnet: Cast iron ASTMA126 Class B 

Disc Ring: Cast Bronze ASTM B62 

Seat Ring: Cast Bronze ASTM B62 

Body gasket: Graphite Non Asbestos