GE SVI II AP Quick Start Manual page 64

Table 15: Pneumatics Double Acting Standard Flow
Air Supply
Action
Supply Pressure for
Double Acting
Air Delivery for
Double Acting
Air Capacity
(flow coefficient)
Air Consumption for
Double Acting
Air Supply Failure
Loss of Input Signal
64 | =GE Oil & Gas
Dry, oil-free, 5 micron filtered air see ISA S7.3
Output 1 increases with increasing signal
Output 2 decreases with increasing signal
25 - 150 psi max. (1.73 to 10.3 bar)
Do not exceed actuator rating.
7.2 scf/min. (204 l/min) at 30 psi (2.1 bar) supply
12.8 scf/min. (362 l/min) at 60 psi (4.2 bar) supply
18.3 scf/min. (518 l/min) at 90 psi (6.3 bar) supply
23.8 scf/min. (674 l/min) at 120 psi (8.3 bar) supply
Loading CV = 0.57
Venting CV = 0.53
0.4 scf/min. (11.3 l/min) at 30 psi (2.1 bar) supply
0.85 scf/min. (24.1 l/min) at 80 psi (5.52 bar) supply
Positioner cannot control the failure position of an actuator without a spring. The actuator
can, under different conditions, fail in place, fail open, or fail close. In cases where the
valve must fail to a required position additional accessories are required.
Some overshoot can occur when air pressure returns after a period without air supply
pressure. Always set control set point to 0%, and put the process control system in man-
ual, for smooth recovery from air supply failure.
Output 1 fails to atmosphere
Output 2 fails to supply pressure.
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