Instruction Manual
D104239X012
Multiport Flow Selector
January 2019
11
3. Rotate the plug (key 2) a few revolutions while checking for smooth movement. If the seal assembly is binding
during rotation, then the seal assembly or the wave springs (key 17) are not in their proper position(s). See
disassembly procedure, if required.
4. Install the appropriate amount of pipe plugs (key 27).
5. Perform any required functionality test(s).
Troubleshooting
Actuator Does Not Align Plug to Inlet Port
1. Check the shaft coupler for looseness.
2. Check the motor for stalling or overload.
3. Check the visual leakage or noisy gear.
4. Refer to the Multiport Electric Actuator (MPA) O&M Manual — Supplied by Bettis (MPA-400-0711
) for port
calibration procedures and troubleshooting.
Seal Leakage
1. Check the travel indicator plate (key 53) and travel indicator pin (key 50) to ensure the plug (key 2) is properly
aligned with the inlet ports.
2. Check the seal insert (key 12) for damage. To visually inspect the seal insert, the blind flange from an unused inlet
port needs to be removed. Prior to removing this flange, verify the Multiport Flow Selector valve has been
depressurized to a value of zero. With the blind flange removed, rotate the plug until visual inspection of the seal
insert can occur. The sealing surface of the seal insert should be smooth, completely intact, and free of deep groove
marks.
WARNING
Ensure that all pressures in the Multiport body, group outlet, and test port are ZERO before visually checking the seal.
3. If more information is required, please contact your Emerson sales office.
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