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HIGH MPA is one of the most professional 3 way ball valve manufacturers and suppliers in China for over 20 years. Please rest assured to buy high quality 3 way ball valve made in China here from our
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When it exceeds the reference voltage of pin 2 of U1, pin U1 1 outputs a high level, which makes Q1 turn on, and the optocoupler OT1 emits light.
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