Introduction: This butterfly valve is suitable for system pipelines such as petroleum, chemical industry, food, medicine, papermaking, hydropower, ships, water supply and drainage, smelting, and energy. It can be used as a regulating and shut-off device on a variety of corrosive and non-corrosive gases, liquids, semi-fluids and solid powder pipelines and containers. It is especially widely used in high-rise building fire protection systems and other pipeline systems that need to display valve switch status.   Performance Specifications   Features: 1. Small and lightweight, easy to disassemble and maintain, and can be installed in any position. 2. The structure is simple and compact, and the 90° rotation can be opened and closed quickly. 3. Small operating torque, labor-saving and lightweight. 4. The flow characteristics tend to be straight, and the adjustment performance is good. 5. The number of opening and closing tests is up to tens of thousands, and the service life is long. 6. To achieve a complete seal, the gas test leakage is zero. 7. Choose different parts and materials, which can be applied to a variety of media. 8. All pipelines using gate valves, globe valves, cocks, hose valves and diaphragm valves, especially in high-rise building fire protection and pipeline systems that need to display the valve switch status, can be replaced by this valve.   working principle: 1. The signal butterfly valve is opened and closed and the flow is controlled by the rotation of the drive shaft of the worm gear and the butterfly plate. 2. Rotate the handwheel of the worm gear and worm gear to make the butterfly plate open and close and adjust the flow. The handwheel is rotated clockwise to close the valve. 3. There are two types of micro switches in the worm gear box: (1) There are two micro-switches for opening and closing in the transmission box, which act when the valve is fully opened and closed, respectively, and turn on the power of the "valve open" and "valve close" indicator lights in the control room to make it Accurately display valve switch status. (2) Only the closing micro switch is set in the transmission box (the full closing position of the butterfly plate is 0°). When the butterfly plate is in the 0-40° position, the micro switch acts to output the valve closing signal, and the other pair of normally closed contacts can output the valve opening signal at the 40-90° position. The cam of the micro-switch can be adjusted to display the different positions of the butterfly plate.