The PIQCV combines a differential pressure regulator with a 2-way control valve to supply a specific flow for each degree of ball opening regardless of system pressure fluctuations. The valve performs the function of a balancing valve and control valve in one unit. Available in sizes 1⁄2 and 3⁄4 inch. The Belimo ZoneTight Pressure Independent Zone Valve is the smallest pressure independent characterized ball valve in the market. It's low power consumption is up to 95% less than conventional zone valves.