Hale 2CBP - Manual (Page 11)

Introduction Sec I-7
Booster Pumps
applied to the diaphragm in the PM Control
valve. As the pressure on the diaphragm
increases beyond the set point, the stem will
move off its seat, allowing pump pressure to
push on the piston in the relief valve. The
pressure on the piston will cause the relief valve
seat to lift
allowing
excess
pressure to
dump back to
the pump
suction. After
the pressure
equalizes, the
piston returns
to the closed
position.
The amber
indicator light on the PM control illuminates
when the relief valve is open.
Thermal Relief Valveb (TRV)
The Thermal Relief Valve (see Figure 1-11)
protects the pump from overheating. The
optional TRV unit can be attached to the
discharge piping either by flange mounting or 1-
1/4" NPT threaded connection (38 mm for the
TRVM). The valve monitors the temperature of
the water in the pump. When the temperature
exceeds 120 o F (48.9 o C), the valve
automatically opens and depending on the
installation, discharges a small amount of water
either to the ground or into the water tank
allowing cooler water to enter. After the
temperature returns to a safe level, the valve
closes. The TRV will flow up to 1-2 GPM (3-7
LPM).
TRV-L Kit
The TRV-L kit includes a chrome panel placard
with a warning lamp, lamp test button, and a
preassembled wiring harness. The light
illuminates whenever the TRV is open and
discharging water. An optional buzzer provides
audible warning. The buzzer mounts on the
operator panel.
Anodes
The Hale Anode System
helps prevent damage
caused by galvanic corrosion
in the pump. Galvanic action
pits the pump and pump
shaft material. The popularity
of non-corrosive water tanks
and piping has increased this
type of corrosion in today’s
fire pumps. The Hale Anode
System is a sacrificial metal, which helps
prevent corrosion. The anode will fit on any
Hale truck mounted pump, regardless of age or
model. It is designed to be easily installed
requiring four bolts and a gasket. Total time to
install is just fifteen minutes, yet it will provide
years of protection for the pump. The Anode kit
is designed for installation in the standard Hale
115 series flange opening. On fabricated
manifolds and similar applications, the installer
is to provide 1-1/4 NPT openings and install
anodes directly. It is recommended that one
anode be installed on the suction side and one
on the discharge side.
Figure 1-11: TRV-L
Figure 1-13:
Hale Anode
Figure 1-12: