HALE AP, Technical Manual

Page: 27 / 177

15
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.