Some end users are investigating diagnostic technology for valve maintenance considerations.  The data acquired from these systems may be helpful in determining the present or future operational status of an automated valve. 

Even though the D-Stop does not require ancillary controls, such controls may be added if the end user specifies them.  For example, if the user would like to gather data to determine if the valve/actuator package is experiencing a change in run time trends, standard actuator top works diagnostic tech­nology may be used. 

But because the D-Stop is mechanical, once it is engaged the end user has assurance that the actuator will not stroke the valve past the test set point.