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2.6.2 TRVs
Hale optional offers a thermal relief valve in two temperature ranges and with remote indication.
• TRV–120
• TRV–170
• TRV–L
The TRV is a thermal relief valve that acts as a thermostat and opens when the temperature of
the water in the pump exceeds 120 ℉ (TRV–120) or 170 ℉ (TRV–170) and resets (closes)
when the water cools. The RSD utilizes the standard Hale 115 series flange opening located on
the side of the volute (K port) and a flange adaptor to house the TRV. For all other Flex series
booster pumps the TRV must be installed on a fabricated manifold and similar application and
the installer is to provide 1-1/4-in NPT opening and install the TRV close to the volute discharge
port. The TRV discharge water should be directed to the ground or back to the booster tank, help-
ing to keep the pump cool and avoiding premature wear and damage.
The TRV–L is a TRV (120 ℉ or 170 ℉) with the added feature of a remoted indicator (audible
and visual) panel to show when the TRV is open and flowing water. The indicator panel also has
an integral test switch.
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