All BAC solenoid valves are constructed of forged brass. The electrical enclosure is rated as watertight and submersible and meets NEMA 3 (rain tight), NEMA 4 (watertight) and NEMA 4X (watertight and corrosion-resistant) requirements. All valves, 3/8″ through 2″, have a built-in slow-closing feature, which minimizes potential water-hammer in the make-up piping. Opening and closing speeds range from two to ten seconds, depending on the size of the valve. The valves are rated to 150 psig (1,034 kPa) working pressure, with a minimum operating pressure differential of 5 psi (34 kPa).
The valve size is the minimum recommended size for a single-cell cooling tower of the rated tonnage. Multiple-cell cooling towers may require a larger size valve or multiple valves piped in parallel due to greater basin volumes.
| Solenoid Valve Selection | |
| Tower Size (nominal tons) | Valve Size (NPT) |
| 0 – 50 | 1/2″ |
| 150 – 250 | 3/4″ |
| 250 – 650 | 1″ |
| 650 – 1300 | 1-1/2″ |