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For water service system sizes up to and including 2 inches (50 mm), a device for controlling pressure shall be installed where thermal expansion has caused the pressure on the downstream side of a pressure reducing valve to exceed the main supply pressure. A pressure reducing valve with an integral bypass check valve or other device shall be installed to satisfy this requirement.
Where a backflow prevention device, check valve or other device is installed on a water supply system utilizing storage water heating equipment such that thermal expansion causes an increase in pressure, a device for controlling pressure shall be installed.
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