2-way valve

The purpose of a 2-way control valve is to shut off water flow or to control and regulate flow through a pipe.

The 2-way valve is characterized by two ports. The valve is normally defined by its kvs [m3/h] value, which expresses the volume of water that passes through the fully open valve in 1 hour with a pressure differential of 1 bar. 

In a mixing loop, the 2-way control valve can be used to control and regulate heating or cooling surfaces, radiator systems, floor heating/cooling, etc. A 2-way valve can also be used as a shut-off valve.
A 2-way valve can either be actuated manually or by electrical, pneumatic or thermal actuators.