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Figure 4.1: Piping Symbol Key
Figure 4.2: Relief Valve Installation
WATER PIPING AND CONTROLS
5. Flow Control Valve: Flow control valves such as the
TACO Flo-Chek or Bell & Gossett Flo-Control™ are
used to prevent gravity circulation by incorporating a
check valve with a weighted disc.
6. Pressure Reducing Valve: A pressure reducing valve,
such as the Bell & Gossett B-38 or a TACO #329, is
used in a hydronic system to automatically feed water
to the system whenever pressure in the system drops
below the pressure setting of the valve. These valves
should not be used on glycol systems unless close
supervision of the glycol solution is practiced.
7. Back Flow Preventer: A back flow preventer (check
valve) is required by some jurisdictions to prevent
water in the hydronic system from backing up into the
city water supply. This is especially important on
systems in which glycol solution is used as the heating
medium.
8. Pressure Relief Valve: The boiler pressure relief valve
is shipped separately for field installation. It is
extremely important that this is installed on the boiler
return pipe (at the rear of the boiler).
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