A traditional freeze valve system relies on the gravitational flow of water down through the supply tubes. It drains the water into a drainage field. If soil conditions do not allow for proper drainage, the ground water can back up into the valve area and prevent the valve drain system from working properly.
Elkay's sealed freeze valve system isolates the water removed from the upper plumbing lines. During operation, the sealed freeze valve pulls water down from above the frost line and stores it in an isolated chamber until the next drink cycle is started. At the start of the next cycle, an internal piston forces the stored water out into a dedicated drainage circuit above ground level. By totally isolating water supply circuits and valve systems, the sealed freeze valve system continues to function properly even if the water table level rises above the valve.