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AFL IV with Dynamometer
Check the circle in front of Valve Check, then click "Next." The Perform Valve Check screen tab will
appear, which shows two graphs: Position vs. Time and Load vs. Time.
During this test, the pumping unit will be stopped at the top third of the stroke (traveling valve), and then
on the bottom third of the stroke (standing valve). To begin the valve check session, click "Start Valve
Check."
Valve Checks can only be accomplished with a good working pumping unit brake. Check
that the pumping unit brake is in good working order before proceeding with a test.
Traveling Valve
In the upper third of the upstroke, a properly working Travelling Valve should be fully closed. If the
pumping unit is stopped in this position, the load will remain constant, provided the valve is sealing
correctly. If the Travelling Valve is leaking, the load will decrease.
Standing Valve
In the lower third of the downstroke, a properly working Standing Valve should be fully closed. If the
pumping unit is stopped in this position, the load will remain constant, provided the Standing Valve is
sealing correctly. If the Standing Valve is leaking, the load will increase.
Counterbalance
Counterbalance Method: No Chains or Clamps
For counterbalance measurement, first allow the unit to come to its resting position. Then turn the unit
on, and let the unit roll to where the cranks are at 90 degrees from vertical. Now, try to find the point
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Sage Technologies, Inc.
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