Fire Protection Resilient Seat Riser Check Valve 
Single flapper with spring return check valve by Arita Fire Solutions, ensures single directional flow allows horizontal and vertical (upwards only) installation in fire protection system.

Certification: UL/FM
Model: SW56 Series
Design Standard: UL 312/FM 1210
Size: 2"-12"
Rating: 350 PSI
Body: Ductile Iron
Clapper: Stainless Steel, ASTM A276 SS304
Clamping Ring: Stainless Steel, ASTM A276 SS304
Plug, Bolt: Carbon Steel, ASTM A29 1045
Spring, Disc Bolt, Locknut: Stainless Steel, ASTM A276 SS304
Body Coating: Epoxy Resin Fusion Bonded
Connection: Groove End

Resources

Technical Drawing Arita SW56-Groove Check Valve