Appendix A, Vitals Valve Exercising Program
E.H. Wachs Part No. 79-MAN-04, Rev. I 213
Appendix A
Vitals Valve
Exercising Program
Vitals provides two modes of valve operation.
• The ‘EXERCISE’ mode is designed to close and open
(exercise) a valve as part of a maintenance routine, with
minimal risk of damage to the valve.
• The ‘EMERGENCY’ mode is used when the valve
must be closed quickly; a higher risk of valve damage is
acceptable for the sake of speed.
The main difference between the modes is that the rate at
which torque is increased is greater in the EMERGENCY
mode.
The valve turning program relies on several control modes
as the machine works through the valve turning process.
The control mode of the machine varies based on the state
of the valve turning operation (direction to turn the valve,
valve stuck or turning) and the mode of operation.
Function Overview
At the start of the valve turning operation, the machine (and
likely the user) has no way to know what state the valve is
in when the machine is first connected. The torque required
to turn the valve is unknown and the valve could be fully
open, fully closed, or anywhere in between.
The machine starts with a torque LIMIT of 100 ft-lbs, but
the machine attempts to move the valve back and forth with
a lower torque call the SETPOINT. The machine attempts
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