N.Y.C. Admin. Code § MC 1205: Section MC 1205: Valves

1205.1 Where required.

Shutoff valves shall be installed in hydronic piping systems in the locations indicated in Sections 1205.1.1 through 1205.1.6.

1205.1.1 Heat exchangers.

Shutoff valves shall be installed on the supply and return side of a heat exchanger.

Exception: Shutoff valves shall not be required where heat exchangers are integral with a boiler; or are a component of a manufacturer's boiler and heat exchanger packaged unit and are capable of being isolated from the hydronic system by the supply and return valves required by Section 1005.1.

1205.1.2 Central systems.

Shutoff valves shall be installed on the building supply and return of central utility systems, and district heating and cooling systems.

1205.1.3 Pressure vessels.

Shutoff valves shall be installed on the connection to any pressure vessel.

1205.1.4 Pressure-reducing valves.

Shutoff valves shall be installed on both sides of a pressure-reducing valve.

1205.1.5 Equipment and appliances.

Shutoff valves shall be installed on connections to mechanical equipment and appliances. This requirement does not apply to components of a hydronic system such as pumps, air separators, metering devices and similar equipment.

1205.1.6 Expansion tanks.

Lockable shutoff valves shall be installed at connections to all expansion tanks. Valves shall be locked in the open position.

1205.2 Reduced pressure.

A pressure relief valve shall be installed on the low-pressure side of a hydronic piping system that has been reduced in pressure. The relief valve shall be set at the maximum pressure of the system design. The valve shall be installed in accordance with Section 1006.