Other Type of Valves and Fittings
a. Check Valve
This valve will only allow flow in one direction, i.e. to prevent back flow of water.
We have seen an example of usage in Section 2 with multiple chillers installation.
There are two basic design of these check valves:
1. swing check valve - can be installed in horizontal or vertical piping
2. lift check valve - only for horizontal piping installation
Swing check valve
Lift check valve
b. Plug Cock/Plug Valve
This type of valve is also used for throttling duty. It is less expansive compared with the
globe valve or balancing valve. The setting also cannot be tampered with as easily as the
globe valve.
Valve stem without handwheel. Use
a spanner or wrench to open and close
valve.
Plug with orifice port. With a 90° turn, the
port will operate from fully open to fully
close.
Section 3 Page 52
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