A 3-way switching circuit uses two switches to control a single light fixture from different locations. The switches are connected in a way that allows either switch to turn the light on or off, regardless of the position of the other switch. This setup creates a convenient way to control the lighting in a room from multiple entry points.
You insulate the 3way valve for the FCU to control temperatures. If the valve is left uninsulated, the contents will either lose or gain temperature depending out external conditions.
we use 2-3way switch and 1-4way switch
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