◇ Overview and Features ZDK type combination solenoid air valves for hydroelectric generating set speed down to 35 to 40% of rated speed, the accepted speed signal relay electrical signals, so that the valve action, leading to the compressed air brakes, brake-input or brake reset. ◇ main technical parameters 1) Working pressure: 0.3 ~ 1MPa non-corrosive gases. 2) Nominal diameter: Φ10 mm, Φ15mm, Φ20 mm. 3) intake, outlet fittings are standard (d / d1: Φ10 / Φ12, Φ15 / Φ18); 4) Power supply voltage: DC110V, DC220V, AC220V. 5) Conditions: medium temperature <60 ℃, relative humidity <85% ◇ Work and principle of the valve is small, compact structure, reliable performance, easy installation and maintenance. Also features a manual valve in case of power failure can be achieved manually. See diagram: ① automatic control, the pilot valve manual switch must be in the "off" position. ② pilot valve is energized when the gas pressure P C that is out of the mouth A; B port and the O port connected, when the pilot valve is energized gas pressure P D that is an A port and the O port communication port from B to realize the brake and reset functions. ③ Manual operation: Turning the manual valve to the "on" position, the Manual operation (open only C or D open, can not open). ◇ Model Description ZDK □ - □ / □ Operating Voltage (V) rated medium pressure Nominal by model