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667NS2 Actuator
March 2022
Bench Set Adjustment
Ensure that the actuator diaphragm is at the bottom of its travel and not connected to the valve.
Note
Some spring compression may be required to ensure that the actuator diaphragm is at the bottom of its travel and not connected
to the valve.
WARNING
When moving the actuator stem with diaphragm loading pressure, use caution to keep hands and tools out of the actuator
stem travel path. Personal injury and/or property damage is possible if something is caught between the actuator stem and
other control valve assembly parts.
Also, provide a certified pressure gauge that will accurately read the diaphragm pressure from 0 through the upper
bench set pressure marked on the nameplate. Apply loading pressure to the diaphragm.
Stroke the actuator a few times to ensure that the pressure gauge is working correctly, and that the actuator is
functioning properly.
CAUTION
To prevent product damage, it is important to ensure that the actuator assembly is not binding or producing any friction on
the actuator stem movement.
Key numbers are shown in figures 4 to 9.
1. If not already accomplished, push the valve stem down away from the actuator to the closed position.
2. Connect an unpressurized, regulated air hose to the port located on the side of the top of the yoke (key 109) for size
45 and 70, or on the bottom of the lower diaphragm casing for size 80.
Note
Rotate the handwheel clockwise until the travel indicator (key 164) on the lower sleeve (key 163) points to the neutral position on
the handwheel travel scale (key 183).
3. Slowly increase the pressure on the bottom of the diaphragm (key 105) until the set pressure is 0.3 bar (5 psig) over
the upper bench set pressure. The upper travel stop should be contacting the upper diaphragm plate (key 107).
4. Slowly decrease the pressure towards the upper bench set pressure while checking for the first movement of the
actuator stem (key 125).
Note
Before turning the spring adjusting screw, assemble the stem connector around the actuator stem and put the long piece of the
stem connector into the anti‐rotating slot on the yoke. Mark the actuator stem as a visual reference to verify that stem rotation
does not occur. Remove the stem connector before rechecking the bench set.
10
Instruction Manual
D103472X012
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