Baker Hughes Masoneilan SVI3, Инструкция по эксплуатации, Страница: 34 / 123

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Performing a Visual Inspection
For reciprocating valves the adjustable link turnbuckle must be parallel to the valve stem.
To ensure linearity in positioning verify that the hole in the lever aligns with the indicating
hole in the bracket when the valve is in the closed position. Check that the bracket is
mounted on the correct holes. (See Figure 11 on page 31 and Table 3 on page 31 for
details).
3.5 Connecting the Tubing and Air Supply
This section describes the process for connecting the tubing and air supply to a single
acting positioner.
Maximum allowable air supply pressure to the SVI3 varies according to actuator, valve
size, and valve type. See Pressure Drop tables in valve specification sheets to determine
the correct positioner supply pressure. Minimum supply pressure should be 5 psi to 10 psi
(.345 bar - .69 bar) (34.485 - 68.97 kPa) above maximum spring range but must not
exceed the rated actuator pressure.
1. Install the air filter/regulator to the air supply port.
2. Connect the air supply to the air filter/regulator input
Figure 14 SVI3 Air Ports on Single Acting Positioner
3. Make sure the following specifications and limits are respected:
• Supply pressure for single acting SVI3: 20 -120 psi (1.4 - 8.3 bar) (138 - 830 kPa).
• Minimum tubing diameter 1/4" (6mm x 4mm)
• Use Wrench Torque for the fittings and Do not apply more than 10 Nm.
4. Turn on the Air supply with air regulator set to Zero.
5. Increase the supply pressure to required range for the particular actuator used.
6. Inspect the tubing connections between the filter-regulator and the positioner for
leaks.
1/4" NPT Supply
1/4" NPT Output