Actuator Testing - Emerson BETTIS G01 Series Disassembly And Reassembly

Section 3: Actuator Reassembly
October 2015
3�6

Actuator Testing

3�6�1
3�6�2
NOTE:
If excessive leakage across the piston remains, the actuator must be disassembled and the
cause of leakage must be determined and corrected.
3�6�3
3�6�4
3�6�5
3�6�6
NOTE:
If any leakage occurs during step 3.6.6 the actuator must be disassembled and the cause of
leakage must be determined and corrected.
3�6�7
3�6�8
WARNING: FIELD TEST WITH GUIDANCE
The actuator's main pressure bearing parts will be tested in controlled conditions by
pressuring both sides of the piston to avoid damage and over torquing of the actuator
components. If further future testing in the field is necessary, Emerson should be
contacted for guidance.
3�6�9
20
Leakage Test: All sources of leakage to atmosphere and across piston are to be
checked, using hydraulic pressure.
Cycle the actuator five times at 10 percent of the operating pressure, as listed on
the cylinder name tag under maximum pressure.
Apply operating pressure as listed in step 3.6.2 to one side of the piston and allow
the actuator to stabilize.
Repeat the above procedure for the opposite side of the piston.
If an actuator was disassembled and repaired, the above leakage test must be
performed again.
Shell test the actuator as follows: Apply 1.5 times the pressure listed on the
cylinder name tag to both sides of the piston simultaneously for a period of two (2)
minutes.
If an actuator was disassembled and repaired, the above testing must be
performed again.
Shell Pressure Test – Optional pressure test could be performed on the actuator by
applying pressure to both sides of the piston simultaneously for a period of two (2)
minutes. If any leakage occurs across a static seal, the unit must be disassembled
and the cause of leakage determined and corrected.
After the actuator is installed on the valve all accessories should be hooked up and
tested for proper operation and replaced if found defective.
Service Instructions
127072E Rev. C
Actuator Reassembly