- CSA: B64.4.1
- ASSE: 1047
- Highest hazard protection: high or severe
- Back pressure resistant: yes
- Continuous pressure resistant: yes
- Field testing required: yes
Overview/Benefits
- Provide reliable protection from both back siphonage and back pressure for high risk fire protection systems.
- Are generally used in locations where an air gap is impractical.
- Leaks are easily detected in case of failure.
- Should not be installed below ground level, in a pit or a vault.
- Requires access to a floor drain.
- For models of 2 1/2 ″ and more, assembly with OSY (Open Stem & Yoke) or butterfly valves ready to receive added supervision.
Application examples
Buildings or sites where there are chemicals in the sprinkler lines:
- Terminal
- Chemical factory
- Petroleum product storage
- Sprinkler line where there is a risk of freezing with glycol gel
