©Copyright Task Force Tips, Inc. 2016
LIA-212 December 8, 2016 Rev03
7
5.0 USE
5.1 VALVE OPERATION
The valves covered by this manual utilize positive stops at the OPEN and CLOSED positions. Attempting to close a valve further than
the positive stops will not result in a tighter seal between the ball and valve seat. All valves include markings to indicate the direction
of handle rotation to open the valve.
Valves with hand cranks include a valve position indicator. To open the valve, turn the hand crank until the valve position indicator
shows OPEN. To close the valve, turn the hand crank the opposite way until the valve position indicator shows CLOSED.
CLOSED
OPEN
OPEN
CLOSED
Figure 5.1
Valve Position Indicator
Up to the maximum rated pressure, operating torque should never exceed the values in the table below. If greater torque is required
to operate the valve, then that is an indication that the valve needs maintenance. Exceeding 30 ft-lb / 41 N-m torque may damage
the appliance. Kicking or standing on the valve controls is considered misuse of the appliance.
Valve Seat Bore
Size
Max. Acceptable
Torque
Max. Acceptable
Force on Knob
3.65 in
93mm
12 ft-lb
16 N-m
45 lb
20 kg
Exceeding 45 ft-lb will cause one side of the crank shaft to shear off. This is intentional to prevent further damage to the gearbox. If
the shaft shears off, the valve can be operated temporarily using a wrench on the ½” hex on the opposite side of the crankshaft. For
repair instructions, see section 9.2 CRANKSHAFT OVERRIDE AND REPLACEMENT.
5.2 AIR VENT AND WATER DRAIN
CAUTION
Loss of prime can interrupt water fl ow and cause injury or death. Always bleed out air with air
valve to prevent possible loss of prime.
The BIV-LP comes with an Air Vent/Drain Valve situated on the top of the valve.
5.3 PRESSURE RELIEF VALVE
WARNING
Do not leave the pressure relief valve in the OFF position. The pressure relief valve is disabled in
the OFF position and offers no protection against over pressurization. The OFF position may be
used for controlled pump testing but should not be used for service conditions. Exercise great
care to avoid water hammer or other pressure spikes when the pressure relief valve is in the OFF
position.
WARNING
The Pressure Relief Valve may be damaged if frozen while containing signifi cant amounts of
water. Such damage may be diffi cult to detect visually and can lead to possible injury or death.
Any time the Pressure Relief Valve is subject to possible damage due to freezing, it must be
hydrostatically tested by qualifi ed personnel before being considered safe for use.
LDH valved appliances may be equipped with a pressure relief valve that can be set to any pressure between 90 and 300 psi. Its
function is to protect the pump and supply hose from excess pressure.
See
LIA-202
Pressure Relief Valve Instructions for Safe Operation and Maintenance.
