Two Way and Three Way Valves
Automatic control valves used in hydronic systems may be classified as either two-way
or three-way. All three types of actuators mentioned above may be used for these two
types of valves.
In the two-way valve, water flows into the inlet port and exits from the outlet port. By means
of the actuator, the flow rate may vary from full flow to zero.
There are two types available: single-seated
and double-seated. For most applications,
the single-seated type will suffice. In this type, there is only one valve seat and one plug-disc
to clsoe against the flow. However, for applications with higher operating pressures, the
double-seated types may be used.
attachment to actuator
Water In
Water Out
In the three-way valve, three ports are available. Depending on the application, these
can be configured as a mixing
or diverting valve.
1. Mixing Valve attachment to
- two streams of water blends into a single stream
actuator
A A+B
B
1
2. Diverting Valve
-splits one stream into two different streams
2
A+B B
3
A
Section 3 Page 47
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