Service Instructions
137463E Rev. D
August 2015
17
Section 4: Actuator Testing
Actuator Testing
4.1.7 If an actuator was disassembled and repaired as a result of this procedure, the
above leakage test must be performed again.
4.1.8 Operational (Functional) Test: This test is used to verify proper function of the
actuator.
NOTE:
This test is to be done off of the valve or when valve stem is not coupled to the actuator torque
shaft.
4.1.8.1 Adjust the pressure regulator to the pressure rating that the customer
uses to operate the actuator during normal service.
4.1.8.2 Apply the above pressure to the actuator and allow the actuator to
stabilize. The actuator should stroke a full 90° travel with the stops
properly set.
4.1.9 Shell Pressure Test - Optional pressure test could be performed on PED certied
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.
WARNING: PED PRESSURE TESTING
The actuators main pressure bearing parts will be tested in controlled conditions in
accordance with the requirement of PED by pressuring both sides of the piston to avoid
damage and over torquing of the actuator components. If further future testing in the eld
is necessary, Emerson should be contacted for guidance.
4�2 Return to Service
4.2.1 Install breather (30) into end cap (4-20).
4.2.2 Install position indicator (1-50) onto the top of torque shaft (1-30).
4.2.3 After the actuator is installed back on the valve or the device it is operating all
accessories should be hooked up and tested for proper operation and replaced,
if found defective.
To Next Page
Loading...
Need help?
General
