Technical Specifications

ValVue Digital Communications Software Ver. 2.80
590
GE Oil & Gas
 Standard Actuator Signature: Measures the position vs.
pressure response of the valve when increasing pressure and
when decreasing pressure. The test is made from 10%
position to 90% position with data points taken every 10%.
This test produces a pressure vs. position graph where the
actuator pressure is first increased slowly then decreased
slowly. The graph displays data from 10% to 90% in 10%
increments, both increasing and decreasing.
 Speed – A number from 1 (slowest) to 9 (fastest). The speed
should generally be as slow as possible where the test
finishes in a reasonable amount of time. As a rule of
thumb, the speed can be the size of the valve in inches but
not less than 2 or more than 9.
Figure 13 Standard Actuator Signature Test
 Positioner Signature: The valve signal is slowly changed from
the starting current to the ending current and then back. The
number of points indicated are sampled equally spaced in
each direction). A Positioner Signature produces an input
signal vs. position graph for both increasing and decreasing
signal. The signal is a simulated signal so linearity cannot be
checked. The positioner is slowly moved from the starting
position to the ending position and back and the two curves
(up and down) are measured and displayed.
 Starting current (mA)
 Ending current (mA)