Fisher 8580 Instruction Manual page 18

8580 Valve
April 2020
Figure 9. Follower Spring/Spring Seat Assembly
CAUTION
8580 valve disk rotation is counterclockwise to open (when viewed from the actuator side of the valve body, see figure 8).
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 Fisher 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 Fisher 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 8. 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.
18
FOLLOWER
SPRING SEAT
(KEY 9)
FOLLOWER SPRING
(KEY 12)
Instruction Manual
FOLLOWER
SPRING SEAT
(KEY 9)
D103300X012