Valves
In Section 2, we have look at several piping network configurations. The diagrams shown in that
section have been simplified. In actual situation, the piping will have most of the pipe fittings
described earlier in this Section 3. In addition, valves are also installed along the piping lines.
Valves are used for the following purposes:
a. To isolate a component of the hydronic system from the rest of the system; thereby enabling
easy maintenance and repair of that component.
b. To regulate the water flow rate through the system.
c. To divert or mix flow directions, optimizing the water temperature in the system.
d. To relieve or regulate pressure.
e. To prevent backflow.
Valves are constructed to withstand a specific range of temperature, pressure, corrosion and
mechanical stress. Careful selection of the correct valve for a particular application is
important to give the best service with consideration of economic requirements.
The following diagram gives the general anatomy of a valve:
Section 3 Page 41
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