1 Scope

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

1.2 The check valves covered by these requirements are intended for installation and use in accordance with the Standards for:

1. a) Low-, Medium-, and High-Expansion Foam, NFPA 11;

2. b) Installation of Sprinkler Systems, NFPA 13;

3. c) Installation of Standpipe and Hose Systems, NFPA 14;

4. d) Water Spray Fixed Systems for Fire Protection, NFPA 15;

5. e) Installation of Foam-Water Sprinkler and Foam-Water Spray Systems, NFPA 16;

6. f) Installation of Stationary Pumps For Fire Protection, NFPA 20;

7. g) Water Tanks for Private Fire Protection, NFPA 22;

8. h) Installation of Private Fire Service Mains and Their Appurtenances, NFPA 24;

9. i) Water Mist Fire Protection Systems, NFPA 750; and

10. j) Installation of Sprinkler Systems in Residential Occupancies Up to and Including Four Stories in Height, NFPA 13R.

Summary of Topics

This New Edition of ANSI/CAN/UL/ULC 312, Standard for Check Valves for Fire-Protection Service, dated June 2, 2022 has been issued to reflect the latest ANSI and SCC approval dates, and to incorporate the proposals dated September 30, 2019 and February 4, 2022.