This schematic details the piping arrangement for an HVAC heating coil. The supply and return lines include ball valves for isolation, pipe unions for maintenance, and reducers. A control valve regulates flow, paired with a balancing valve and a strainer with a blow-off valve on the return side. Pete's plugs and a one-quarter-inch gauge cock are included for temperature and pressure measurement and manual air venting.
COIL AIRFLOW REDUCER (TYP.) VALVE BALL VALVE UNION (TYP.) (TYP.) CONTROL VALVE BALANCING STRAINER W/ BLOW OFF VALVE PETES PLUG (TYP.) 1/4" GUAGE COCK FOR MANUAL AIR VENTING
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