The devices covered by this standard are those which havefunctional capabilities for preventing both back-siphonage and backpressure and which can operate under continuous or intermittentpressure conditions. These devices have two (2) independentlyoperating check valves separated by an intermediate chamber with ameans for automatically venting it to the atmosphere and can beinstalled in the horizontal, vertical up or vertical downorientations. The check valves are force loaded to a normallyclosed position and the venting means is force loaded to a normallyopen position.
Inlet and outlet pipe sizes are 1/4 to 3/4 NPS (8 mm to 20 mm)inclusive.
Minimum Pressure Rating
The device shall be designed and constructed for a workingpressure of at least 150.0 psi (1034.2 kPa).
The device shall be designed and constructed for normal flowtemperatures of 40.0 Â°F to 210.0 Â°F (4.4 Â°C to 98.9 Â°C) and anemergency back pressure temperature of 250.0 Â°F (121.1 Â°C).
Manufacturer's advertised maximum flow rate.
- Product Code: ASSE
- Availability: In Stock