The Three Way Stopcock contains the same components as the two-way valve. It differs from a two-way valve in that an extra port is used. Like the 2-way valve, the 3-way valve assembly can also be controlled by pneumatic or electric actuators.

These valves can be used to divert fluid flow or to mix fluid from two inlets to one outlet. When used as a mixing valve, fluid from inlets A and B mixes inside the valve body and then passes through port AB.

Mixing allows a combination of fluids with varying temperatures and pressures to be combined through an outlet having specific desired characteristics.

When used as a steering valve, port AB acts as an inlet and ports A and B act as outlets. When the plug and the spindle are 100% in the up position, port A is blocked, allowing only flow from AB to B. When the plug and spindle are 100% in the down position, the flow through port B is blocked and the flow is only allowed from AB to A.

The Three Way Stopcock is more cost effective for steering and mixing applications than using multiple two-way valves. The ability to mix fluids from multiple inlets makes 3-way valves ideal for heating and cooling various media such as water, oil and chemicals. These valves are also commonly used as bypass valves in primary and secondary circuit applications. Similar to the 2-way valve, the 3-way valve is also used in the same process industry as mentioned above.



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