Masoneilan SVI II AP Installation and Maintenance ... - GE Energy

Filter Regulator and Tubing
Installation and Set Up
Filter Regulator and Tubing
The use of a Masoneilan filter regulator with a 5-micron filter is recommended for the air
supply. Use 1⁄4" (6.35 mm) minimum tubing between filter regulator, SVI II AP and the
actuator, with 3⁄8" (9.53 mm) used for larger actuators. Use a soft setting anaerobic
hydraulic seal such as Loctite Hydraulic Seal 542 for sealing the pneumatic pipe
threads. Follow manufacturer’s instructions.
NOTE
Maximum allowable air supply pressure to the SVI II AP
varies according to actuator and valve size and type. See
pressure drop tables in valve specification sheets to
determine correct positioner supply pressure. Minimum
supply pressure should be 5 to 10 psi (.345 bar - .69 bar)
(34.485 - 68.97 kPa) above maximum spring pressure.
Mounting the SVI II AP on Rotary Valves
Required Tools
This procedure is used to mount the SVI II AP on rotary control valves that have less
than 60° rotation, such as a Camflex or a Varimax. For valves that have rotation greater
than 60° refer to “Rotary - 90°” on page 35.
The following tools are needed to complete the rotary valve installation:
3⁄16" Hex Key with tee handle
5⁄32" Hex Key
3 mm, 4 mm, 5 mm Hex Key
7⁄16" Wrench
To mount the SVI II AP:
1. Attach the SVI II AP rotary mounting bracket to the valve actuator using two (2) 5⁄16
- 18 UNC flat-head cap screws. Mount the SVI II AP as shown in Figure 8 on
page 33, ATO or in Figure 9 on page 33, ATC. In the preferred mounting position,
the long end of the mounting bracket is on your left when facing the actuator, for any
position of the valve and actuator.
2. Bolt the extension shaft to the valve position take-off shaft using a 1⁄4 - 28 UNF
socket flathead screw. Secure the machine screw holding the extension shaft with a
torque of 144 in-lbs (16.269 N-m).
3. Upon internal valve pressure the thrust shaft is pushed out to the mechanical stops,
usually a thrust bearing. On valves where the valve position take-off is mounted
directly on the end of the plug shaft, a Camflex for example, the shaft must be
bearing on its stop to properly set up the SVI II AP digital valve positioner. During
hydrostatic testing the shaft is thrust to its stop and a normally tightened packing
retains it in that position.
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