2. Connect the delivery hose to the receiving/storage
tank or delivery tank port for recirculation.
3. All shut-off valves on the pump discharge line and
bypass return line should be in a fully open position.
4. Fully open the outlet valve of the supply tank and start
pumping at a normal delivery rate. Make sure the
direction of the rotating shaft follows the directional
arrow located on the pump casing.
5. If the pump has an internal relief valve, check the
pressure setting by slowly closing the shut-off valve in
the bypass return line.
6. Slowly close the shut-off valve located on the
pump’s discharge line while observing the pressure
gauge on the pump’s discharge port. As the internal
relief valve begins to open, the differential pressure
typically drops. It is important to record the peak
differential pressure (the difference between inlet
and outlet pressure) before the internal relief valve
opens. After circulation starts to flow through
the internal relief valve, the pressure will drop
significantly due to vaporization.
NOTE: The internal relief valve on the Z-Series
truck pumps is pre-set at the factory and not
adjustable in the field .
7. After the setting of the internal relief valve is confirmed,
open the shut-off valves located on the pump discharge
line and the bypass return line and resume normal
operation of the pump.
8. To confirm the setting for the T166 external bypass
valve, slowly close the shut-off valve in the pump’s
discharge line and record the pressure shown on the
gauge. The difference between the pump’s discharge
pressure and the tank pressure (before pumping) is
the setting of the external bypass valve.
9. If the pump is equipped with an internal relief valve,
the T166 external bypass valve should be set 20–25
psi (1.38 to 1.72 bar) below the setting of the pump’s
internal relief valve. Following this guideline ensures
the liquid does not recirculate through the internal
relief valve and eliminates the possibility of erratic
“hunting” between the two valves.
10. Reopen the shut-off valve in the pump’s discharge line
and resume normal operation of the pump. Record the
pressure shown on the gauge. The difference between
the pump’s discharge pressure and the tank pressure
(before pumping) is the normal operating pressure of
the system.
11. If possible, the setting of the T166 external bypass
valve should be 15 psi (1.03 bar) higher than the normal
operating pressure of the piping system. An operating
pressure near the external bypass valve setting may
cause the liquid to recirculate unnecessarily.
12.
Adjust the pressure setting of the T166 external
bypass valve if necessary. The external bypass valve
can be adjusted by loosening the locknut and turning
the adjusting screw.
a. To
increase the pressure setting, loosen the locknut
and turn the adjusting screw
clockwise.
b. To
decrease the pressure setting, loosen the locknut
and turn the adjusting screw
counterclockwise.
13.
Once a satisfactory pressure adjustment has
been achieved, attach the “tamper-proof” seal
furnished with the external bypass valve to prevent
unauthorized adjustments.
Notice!
1. If the external automatic bypass valve is sized and set
correctly, a manual or hand operated bypass valve–
if applicable–should remain in the closed position
during normal operation. Keeping the manual or hand
operated bypass valve closed ensures the external
automatic bypass valve operates in a normal capacity.
2. Annual inspection and testing of the internal relief
valve–if applicable–and the external automatic bypass
valve are recommended. For testing procedures refer
to the adjustment procedures listed in this manual.
8
Содержание B166
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