These requirements cover check valves of NPS 1 and larger sizes, used in piping systems supplying water or fire protection service.

The check valves covered by these requirements are intended for installation and use in accordance with the Standards for:
a) Low-, Medium-, and High-Expansion Foam, NFPA 11;
b) Installation of Sprinkler Systems, NFPA 13;
c) Installation of Standpipe and Hose Systems, NFPA 14;
d) Water Spray Fixed Systems for Fire Protection, NFPA 15;
e) Installation of Foam-Water Sprinkler and Foam-Water Spray Systems, NFPA 16;
f) Installation of Stationary Pumps for Fire Protection, NFPA 20;
g) Water Tanks for Private Fire Protection, NFPA 22; and
h) Installation of Private Fire Service Mains and Their Appurtenances, NFPA 24.

Check valves covered by these requirements are intended for installation and use in accordance with, but not limited to the National Fire Code of Canada (NFC), and the National Building Code of Canada (NBC).