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When the preset quantity is nearly reached (1-2 gallons remaining), a final trip point
(field adjustable in controller) signals the valve to close completely assuring accurate
delivery of the preset quantity. Figure 2 shows a typical truck loading flow rate
sequence.
2.2
Start-up and Field Adjustments
Upon initial system start-up, using the 210 Valve, it is recommended that the follow-
ing steps be followed sequentially to insure a stable and properly operating system:
Step 1:
First, all air must be vented from the cover chamber of the main valve. Other-
wise, the valve may be unstable or sluggish. This is done by pressurizing the system
and loosening the highest vent plug in the valve cover until all air is expelled. Valves
installed in horizontal lines usually automatically expel all of the air from the cover
chamber after just a few full actuations of the valve.
Step 2:
Be certain the flow rate limit is properly set in the controller (e.g., AccuLoad,
microLoad, etc.) so the meter is protected from over-speeding and the valve is
modulating (i.e., controlling flow rate).
Step 3:
Before energizing the solenoids to open the valve, completely close the
downstream solenoid control loop isolation needle valve. This prevents the 210 Valve
from opening. Also, adjust the upstream solenoid control loop isolation needle valve
about 1/4 - 1/2 open.
Step 4:
With no other loading position from the pump open (highest valve inlet
pressure) preset a small volume and energize the valve solenoids as normally would
be done to initiate flow.
Step 5:
Slowly open the downstream needle valve until the main valve opens slowly
but smoothly and maintains flow stability (solenoids not "clicking" excessively).
Step 6:
Allow a normal preset shutdown, observing the valve closing speed and flow
stability during the multi-stage shutdown.
Step 7:
If the shutdown speed and flow stability are acceptable, go to the next step.
If either is unacceptable, adjust the upstream needle valve (further closed for slower
valve shutdown and better flow stability, or further open for faster valve shutdown).
Preset small batches each time, repeating Steps 5 and 6 until satisfactory valve
performance is obtained.
Model 210 Valve (I / O / S) Manual
Operation
Figure 2
– Typical Load Cycle
900
600
300
0
2,000
60
0
Gallons*
Low Flow Start*
First Stage Trip*
Final
Stage Trip*
First High Flow Rate*
Second High Flow Rate*
Gallons to Be Delivered
Flow Rate GPM
*Field programmable.
Caution: There must be sufficient pump capacity to achieve the
flow rate set into the AccuLoad or microLoad or the valve may
close slowly resulting in a spill.
