Liquid Controls LCR Install - Manual (Page 10)

10
Valve Installation
Fuel Oil Trucks Preset/Security Valve Installation
Installing an LCR on a refined fuel truck typically requires
the removal of the system’s mechanical valve. Those
trucks equipped with air check valves should retain them
as part of the air elimination system. However, an air
check valve will not perform well as a preset/security valve
on fuel trucks.
Liquid Controls can provide two-stage or single-stage
valves that provide the security and accurate presetting
functions. The valve control software in LCR compares
the volume delivered to the preset amount and
automatically adjusts itself to deliver the correct preset
quantity.
Two-Stage Valves
Two-stage valve solenoids should be connected to the
LCR’s valve control outputs (SOL-1 and SOL-2). When
both of the solenoids are energized, the valve will be
operating at full flow. When SOL-1 is turned off, the valve
will operate at a reduced or dwell flow rate. If neither of
the solenoids is energized, the valve will close, stopping
product flow.
NOTE : A 2-inch Preset Valve can be used with a 3-inch
meter system if the flow rate does not exceed 160 GPM.
Install the preset valve in the pipe between the meter
and the hose reel or manual shut-off valve. If an air check
valve is present in the system, leave it in place.
Make sure that the preset valve is installed in the correct
orientation with respect to fluid flow. On many valves
the flow direction is indicated by an arrow on the valve
body.
Single-Stage Valves
Single-stage solenoids should be connected to the SOL-
2 control. When the solenoid is energized, the valve will
open to the maximum flow rate.
On certain applications, trucks equipped with LC V-7
mechanical valves can be retrofitted with LC air valve
actuators to provide single-stage shut-down and solenoid
block functions. These systems require truck system
compressed air to function. Consult Liquid Controls for
more information.
Special Note for Canadian Installations
Canadian Weights & Measures regulations require that
the preset valve on truck systems be located after the
meter. In addition they require that a manual ball type
valve be located between the meter and the hose reel.
Liquid Controls recommends that the manual ball valve
be located after the preset valve and before the hose
reel.