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9500 Valve
February 2019
Figure 5. Tandem Linkage Adjustment for Three‐Way Valve Assemblies
CONNECTING ROD
ASSEMBLY
SLAVE VALVE
FLOW
B2144‐1
FOR SPLINED VALVE SHAFTS
Linkage
If the linkage between the power actuator and valve is improperly adjusted, the actuator may reach the end of travel
before (or after) the disk reaches the fully closed position. This could result in leakage past the disk. The linkage
adjustment is set at the factory, and it should not be necessary to adjust linkage unless the actuator and valve have
been separated and the adjustment altered.
To check the linkage adjustment on FISHTAIL disks, the flat is on the same side of the shaft as the nose or leading edge
of the valve disk (as shown in figure 2). When the valve disk is at the fully closed position, the flat will be either
top‐dead‐center or bottom‐dead‐center in relation to the valve body. The top‐dead‐center position is shown in
figure 2. A more accurate check of the fully closed disk position is obtained by removing the valve from the pipeline.
WARNING
To avoid personal injury and damage to the process system caused by the sudden release of pressure, isolate the control
valve from all pressure and relieve pressure from the valve body before removing the valve from the line. Be sure the disk is
closed so that it will not hit the mating flanges when being removed from the line.
With the valve removed from the line, position the actuator to the valve‐closed end of the travel. Measure the distance
between the valve face and the top and bottom edges of the disk as shown in figure 2. The disk is at the fully closed
position if the two measurements are equal.
To adjust linkage, refer to the actuator instruction manual.
Three‐Way Valve Tandem Linkage
If the valve is used as part of a three‐way valve assembly, adjustment of the tandem linkage (see figure 5) may be
necessary to ensure proper rotation of the slave valve disk.
8
FLOW
ROTARY ACTUATOR HOUSING
POWER VALVE
FLOW
Instruction Manual
D100380X012
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