Signal in the line of butterfly BWSC butterfly clip signal is my factory introduction of foreign advanced technology and self-developed in line valve, it has a simple structure, reliable sealing, open light, long life, easy maintenance. It is widely used in water supply and drainage, fire protection and other systems on a variety of channels, especially in the fire pipe. The unmistakable signal valve showing the valve switch state, with an intuitive, clear, reliable fire protection system reflects the working state, so extensive, a large number for the fire system.