Troubleshooting - Emerson Fisher 667NS2 Instruction Manual

Instruction Manual
D103472X012

Troubleshooting

Table 7. 667NS2 Troubleshooting
Problem
Ensure all parts are intact and assembled as specified.
Check for debris or damaged parts that may be jamming actuator.
Actuator Stroke is less
Ensure stem connector is assembled as specified.
than full rated travel
Verify bench set for proper actuator spring load. See Discussion of Bench Set in this instruction manual.
Inspect valve, see valve instruction manual.
Verify diaphragm casing bolts are torqued as specified with the proper tightening procedure.
Air leakage
Disassemble and inspect sealing surfaces and diaphragm on the actuator diaphragm case and yoke, especially the diaphragm for
scratches or nicks. Replace damaged parts as needed.
Disassemble and inspect the diaphragm casing and check for debris or damaged parts that may be jamming the actuator.
Replaced damaged and broken parts as needed.
Ensure stem connector is assembled as specified.
Valve does not move
Inspect valve, see valve instruction manual.
Verify bench set for proper actuator spring load. See Discussion of Bench Set in this instruction manual.
Inspect all air connections for leakage.
Other Contact Emerson if more assistance is needed.
Possible Solution
667NS2 Actuator
March 2022
23