3. Loosen the locknut on the B166 external bypass valve
and
decrease the pressure to the lowest setting by
turning the adjusting screw
counterclockwise until
spring tension is no longer present.
4. Make sure the shut-off valves on pump discharge line
and bypass return line are in a fully open position.
5. Record the pressure indicated on the gauge mounted
to the 1/4" NPT discharge opening of the pump.
6. Fully open the outlet valve of the supply tank. Start
pumping at a normal delivery rate and circulate the
liquid back to the supply tank using the discharge line.
7. Slowly close the shut-off valve located on pump
discharge line so all of the liquid flows through the
B166 external bypass valve. Record the pressure
indicated on the gauge mounted to the 1/4" NPT
discharge opening of the pump.
8. Slowly
increase the pressure setting of the B166
bypass valve by turning the adjusting screw
clockwise
and watch the pressure gauge. When the pressure
stops increasing or just before it drops back to
the starting pressure, record the highest pressure
indicated on the gauge mounted to the 1/4" NPT
discharge opening of the pump and turn off the pump.
9.
Decrease the pressure setting of the B166 external
bypass valve again by turning the adjusting screw
counterclockwise two to three turns.
10. Re-start the pump and
increase the pressure setting
of the B166 external bypass valve by turning the
adjusting screw
clockwise. The final pressure setting
should be 5–10 psi (0.3–0.69 bar) under the pressure
indicated in step 8 listed above; however, depending
on your pump model, the final pressure should not
exceed 100–125 psi (6.9–8.6 bar) higher than the
starting pressure.
EXAMPLE: The starting pressure is 125 psi (8.6
bar). After starting the pump it increases to 150 psi
(10.3 bar) and adjusts to a maximum pressure of 235
psi (16.2 bar) before dropping back to the starting
pressure of 125 psi (8.6 bar). Since the final pressure
setting should be 5–10 psi (0.3–0.69 bar) below the
maximum pressure of 235 psi (16.2 bar), the bypass
should be set at 225–230 psi (15.5–15.9 bar) and
locked in position using the locknut.
NOTE: This may be higher than the
full load amperage
(FLA) or
service factor amperage (SFA) of the motor.
If the pump operates in a continuous duty application,
the final pressure setting of the external bypass should
be set just below the FLA or SFA.
11. Once a satisfactory pressure adjustment has been
achieved, attach the “tamper-proof” seal furnished
with the B166 external bypass valve to prevent
unauthorized adjustments.
12. Open the shut-off valve located on the pump discharge
line downstream of the B166 external bypass valve
and continue pumping as needed.
WARNING: Do not adjust the external bypass
valve beyond the range of the spring being used .
NOTE: On Anhydrous Ammonia and LP-Gas
installations, follow the guidelines provided
by Underwriter’s Laboratories, Inc . and NFPA
Pamphlet # 58 .
Notice!
1. If the automatic external bypass valve is sized and set
correctly, the 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 automatic
external bypass valve functions in normal operations.
2. Annual inspection and testing of the pump’s internal
relief valve–if applicable–and the automatic external
bypass valve are recommended. For testing
procedures refer to the adjustment procedures listed
in this manual.
6
Содержание B166
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