8580 Valve
Instruction Manual
March 2010
15
ACTUATOR
END OF SHAFT
Figure 7. Sectional of Typical Valve Body
POSITION
INDICATION MARK
INDICATES
APPROXIMATE
DISK POSITION
CCW DISK
ROTATION
TO OPEN
X2
X1
Figure 8. Follower Spring/Spring Seat Assembly
FOLLOWER
SPRING SEAT
(KEY 9)
FOLLOWER SPRING
(KEY 12)
FOLLOWER
SPRING SEAT
(KEY 9)
Actuator Mounting
With the valve body out of the line, mount the
actuator on the valve body in accordance with the
instructions in the actuator instruction manual. Mount
the actuator yoke to the valve body, and tighten the
actuator-mounting cap screws and nuts (keys 35
and 36) to the appropriate torque from table 8.
Key numbers in this procedure are shown in figure
10 unless otherwise indicated.
1. Determine the actuator mounting style and
position from figure 9.
CAUTION
8580 valve disk rotation is
counterclockwise to open (when
viewed from the actuator side of the
valve body, see figure 7). Rotating the
disk (key 3) past the fully closed
position will damage the seal ring
(key 4). To prevent this damage, use
the following procedures:
D For actuators with adjustable
travel stops, such as a Type 2052,
1051/1052 size 33, 1066 or 1066SR
actuator, make certain the actuator
travel stop prevents the disk from
rotating past the fully closed position.
D For actuators with an adjustable
turnbuckle, such as the Type
1051/1052 size 40, 60, and 70, or 1061
actuator, the turnbuckle must be
adjusted so that the valve is closed
when the diaphragm plate or piston is
against the actuator travel stop.
2. Adjust the actuator to bring the disk to the fully
closed position at the end of the actuator stroke. To
determine the fully closed disk position, measure the
distances between the disk face and the seal
retainer face at the top and bottom of the valve (X1
and X2) as shown in figure 7. Adjust the travel stops
or turnbuckle to rotate the disk slightly until the two
measurements are within 0.8 mm (0.032 inch) of
each other. Refer to the appropriate actuator
instruction manual for assistance.
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