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three-way valve application

Three-way Valves are normally used as mixing or diverting valves to control the flow of liquids. The difference between the two applications is in the piping layout and the internal design of the valve.

three-way mixing valve

Two pipe lines bearing liquids to be mixed connect to the valve one pipe to port "A" and the other to port "B". Connection "AB" is the outlet for the mixed liquids. The mixing proportion of the liquid depends on the position of the valve disc. Thus, a mixing valve receives liquids through two inlets, mixes them, and discharges them through one outlet.

three way diverting valve.

When the valve disc is against the top seat, the liquid enters through port "AB" and leaves through port "B". When the disc is against the bottom seat, "AB" is closed off from "B" and the flow is from "AB" to "A". The diverting valve has one inlet from which flow is directed to either of two outlets.

In a given mixing valve application, the force exerted on the valve disc due to the unbalanced pressure at the two inlets usually remains in the same direction.
The force tends to push the valve disc upward. In cases where there is a reversal of force, the force changes direction and tends to hold the valve disc off the seat, cushioning the valve disc as it closes.
If the pressure difference for the installation is greater than the pressure ratings of all mixing valves, use two globe valves or two butterfly valves in a tee configuration.

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