1. Signal butterfly valve uses worm gear transmission devices to drive the rotary shaft and disc rotation to achieve open and close and control the flow.
2. Rotating worm gear transmission device handwheel, makes disc to achieve the purpose of hoist and adjusting flow, the hand wheel clockwise rotation is valve closure.
3. Worm gear transmission device cabinets set up micro-switches in two forms:
a. In the transmission device cabinets has been set opened, off two micro-switches, respectively actions when the valve is fully open and closed, connected to the control room "valve open", "valve off" light source, so that an accurate showing of valve switch status.
b. Set off micro-switch in the transmission device cabinets (disc fully closed position is 0 °), when the butterfly plate from 0 ° ~ 40 ° position micro-switch supports, the output valve closes signal, 40 ° ~ 90 ° position, another pair of normal output valve open the signal. Adjustable pressure touches micro switch cam, showing different positions of butterfly plate.
2010-07-26