The working principle of the signal butterfly valve: 1, the signal butterfly valve driven by the worm gear shaft and disc rotation to achieve opening and closing and control of flow. 2, rotate the worm gear handwheel so that the disc to achieve the purpose of opening and closing and regulating the flow, hand wheel clockwise turn the valve closed. 3, the worm gear box There are two forms of micro-switches installed in the box body: a, in the transmission box with open to the two micro-switch off, respectively, the valve fully open and closed action, connected Control room "valve open" "valve closed" light source, so that the valve switch state accurately show. b, in the transmission box to set the switch to the micro-switch (butterfly close position of 0 °), when the butterfly from 0 ° ~ 40 ° position micro-switch support for the output valve off signal, 40 ° ~ 90 ° position when the other pair of normally closed output valve open signal. Adjustable pressure contact micro-switch cam, showing the disc at different locations.
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