Emerson Fisher 667NS2 Instruction Manual page 9

Instruction Manual
D103472X012
When determining valve friction, you can make diaphragm pressure readings at a travel position other than mid‐travel
if you desire. If you take readings at the zero or at the full travel position, take extra care to ensure that the readings are
taken when the travel just begins or just stops at the position selected.
It is difficult to rotate the spring adjusting screw (key 127, figure 4, 7, or 8) when the full actuator loading pressure is
applied to the actuator. Release the actuator loading pressure before adjusting. Then re‐apply loading pressure to
check the adjustment.
Figure 2. Schematic and Stem Connection Details for Fisher 667NS2
AIR
LIFTS
VENT
DIAPHRAGM
CASING
YOKE
A
ACTUATOR
VALVE
STUDS
AND NUTS
HPNS
VALVE
GE51580-A
TRAVEL
INDICATOR
SPRING
PUSHES
DOWN
YOKE
A
TRAVEL
INDICATOR
POINTER
SECTION A-A
667NS2 Actuator
March 2022
STEM
CONNECTOR
STEM
LOCKNUTS
VALVE STEM
TRAVEL
INDICATOR
POINTER
YOKE
KEY 187 NOT USED
9