15
6. Startup
6.1 Output Adjustment
Figure 13
PULSAR Shadow
®
pumps have a handwheel for manual stroke length adjustment.
Mounted atop the eccentric box, the handwheel can be adjusted at any point from (0 to
100%) stroke setting by pressing down and then rotating as required. Stroke length is
locked during operation to prevent drift: pressing the handwheel down temporarily
disengages the lock for adjustment; release after adjustment automatically resets the
lock at the new setting. An indicator adjacent to the handwheel displays the output
setting. Adjustments can be made while the pump is at rest or operating, although
adjustments are easier to make while the pump is in operation. Manual adjustment
serves as a backup for pumps provided with DLC/M controllers.
6.2 Priming the Reagent Head
1. Open the suction and discharge line shutoff valves.
2. If the piping system design and the storage tank are such that the product flows due
to gravity through the pump, reduce the discharge pressure and the system will self
prime when the pump is started.
In the event the discharge line contains a
significant amount of pressurized air or other gas, it may be necessary to lower the
discharge pressure to enable the pump to self-prime.
3. If the installation involves a suction lift, it may be necessary to prime the reagent
head and suction line. Try priming the reagent head first. Refer to the Maintenance
Section on Check Valves. Remove the discharge valve assembly. Fill the head
through the discharge valve port with process (or compatible) liquid, and then
reinstall the valve.
4. Start the pump at the zero stroke length setting and slowly increase the setting to
100 to prime the pump. If this does not work, it will be necessary to fill the suction
line.
5.
Filling of the suction line will necessitate the use of a foot valve or similar device at
the end of the suction line so that liquid can be maintained above the reservoir level.
Remove the suction valve assembly, fill the line, replace the valve, then remove the
