This piping schematic outlines the control and isolation valve arrangement for an HVAC heating coil. The supply line features a typical ball valve, union fitting, control valve with a reducer, and a Pete's plug prior to entering the coil. A balancing valve is installed on a bypass branch line connecting the supply and return headers. The return line incorporates a strainer with a blow-off valve, upstream ball valve, and a one-quarter inch gauge cock for manual air venting near the coil connection.
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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