osition Master ABB Digital Valve Positioner For Pressure Control Valve EDP300 Series with chinese brand control valve with stock

This test requires the EDP300 Pressure Sensor Module Option.
The Valve Signature, which is displayed via the DTM, is used to
detect the static and sliding friction of the valve. The valve
hysteresis is also displayed, for this purpose the various
positions across the entire valve range are approached in steps.
When the Valve Signature starts, the entire valve operating range
for the ‘open and closed directions’ is covered in an uncontrolled
manner (open loop test). During this process, the pressure
patterns of the diagnostic pressure sensors are recorded using a
configurable number of 10 to 100 positions.
For each step, there is a 4-second delay so that the valve can set
itself after the required position has been reached.
Once the signature test is complete the parameters selected by
the user are loaded from the device and displayed.
Consequently, excessively heavy movement of the valve is
displayed as a greater hysteresis.
Additionally, the position and signal waveform for the optional
Universal Input can also be recorded.
The Valve Signature of a new or refurbished assembly provides
valuable data as the baseline performance for comparison of
valve and actuator condition as part of routine valve
performance verification.