1、Purpose:　This wedge gate valve is classified into common gate valve and signal gate valve. It is especially applicable to the water supply ductwork of hydrant and auto sprinkler system. It can also be used in other water supply, petroleum and chemical ductworks for the shutoff of water flow.2、Features:　1. New patterned, dense structured and beautifully shaped.　2. Its small size is especially applicable to small space and place with a large content of dust.　3. Its wedge single gate structure guarantees a good sealing and reliable operation.　4. Its small flowing resistance of medium saves energy in on/off operation, with free installation direction.　5. Switch indicator in provided with common gate valve, which can directly display the on/off condition of valve.　6. On/off display is provided with signal gate valve, which can transfer the electric signal indicating the on/off condition of valve to the fire control center. When the is closed to the extent of 1/4 of openness of gate, the closed signal will be transmitted to the fire control center to increase the safeness of firefighting water supply.