Technical Specifications

ValVue Digital Communications Software Ver. 2.80
640
GE Oil & Gas
 Response Time Test: If no pressure sensor is present, no
parameter is required. If a pressure sensor is present, an
actuator signature is measured and a speed must be entered.
A Response Time Test measures the time for the valve to go
from full closed to full open and the time for the valve to go
from full open to full closed.
Figure 10 Response Test
 If the SVI2 contains a pressure sensor, an actuator signature is
also measured and friction, spring range, and supply pressure
are reported in the diagnostic results box.
 Speed: A speed of four is typical for almost all valves. Very
large valves may require a speed greater than 4 (up to 10)
and very small valves may require a lower speed. The
lower the speed value, the slower the test is run.
 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):
 Starting current (mA)
 Ending current (mA)
 Number of points to sample. This number often needs to
be 1 more than you might expect. e.g. to sample from 5
mA to 10 mA with a sample every 1 mA, you want samples
at 5, 6, 7, 8, 9, and 10 or 6 (not 5) samples.