SINGER'S SPECIALTY PRV REGULATES BANGKOK PRESSURE
With water loss up to 30 per cent, Metropolitan Water Authority (MWA) in Bangkok, Thailand, installed pressure reducing valves throughout the city and its suburbs. The valves controlled nighttime pressures accurately, preventing leaks and breaks. However, in some areas, high demand during the day caused the pressure to drop to 10 psi (0.68 bar) or less. Without sufficient pressure differential, regular pressure reducing valves would close, cutting off supply to consumers.
Because typical PRVs cannot open when the pressure drops below 10 psi (0.68 bar), Singer Valve’s instrumentation specialist Eugene Bahia fitted a 12” (300mm) valve with a standard Singer PR pilot and a Singer high-accuracy three-way pilot. By installing the custom combo into Singer’s flow lab, Bahia simulated various pressure and flow conditions. The results were rewarding. “Because of the large diaphragm and sensing area of the three-way pilot,” says Bahia, “the valve required only seconds to open. And it remained fully open during the day’s high flow demands even with pressure as low as 2 psi (0.14 bar).”
When the custom unit was installed and tested in Bangkok, the results remained consistent. Pressure was reduced during high pressure periods at night. During low pressure / high flow periods in the day, the valve opened fully, ensuring a constant water supply to consumers. As a result, the water authority has installed numerous 12” (300mm) valves. “Our water loss was about 30 per cent,” says Mr. Ulit, MWA’s director of water loss management. “With Singer Valve, it’s now below 30 per cent.”
"OUR WATER LOSS WAS ABOUT 30 PERCENT. WITH SINGER VALVE, IT'S BELOW 30 PERCENT"
- Mr. Ulit. Director, Water Loss Management, Metropolitan Water Authority, Bangkok, Thailand