fire fighting signal butterfly valve

Fire fighting signal butterfly valve 's gear worm -drive device chest is set up the microswitchs inside the body. 1. At the gearing chest has out inside the body to and the pass to two micrswitchs. Two switches move respectively at the valve standard-sized sheet with when cutting outm the pilot lamp power supply in the connection control room " valve leavel" "valve pas"' make accurately shows the valve switch state. 2. In the gearing chest body The signal is closed down by the export valve to the microswitchaction when thme butterfly board is by 0-40 seat, and another can be sebded out the valve and opening the signal to often closing the contact during 40-90° seat. Can adjust the cam that the pressure was touched the microswitch, and show the different seats of butterfly board place.