Emerson Fisher 8540 Instruction Manual page 13

Instruction Manual
D104709X012
Figure 8. Disk Rotation Indication
TO OPEN
NOTE:
1
SET ACTUATOR TRAVEL STOPS TO OBTAIN AN
EQUAL DISTANCE TO DISK SURFACE AS SHOWN.
CAUTION
Do not rotate the disk past 90 degrees in the open direction. Rotating the disk past 90 degrees can damage the seal ring or
other component parts.
Note
PTFE, NOVEX, and Phoenix Ill seal rings used in other valve types are not interchangeable with seal rings used in the 8540 valve.
The 8540 seal rings are not interchangeable with seal rings in any other valve type. To order seal rings for this valve, provide the
serial number on the valve.
1. Installing PTFE seal rings:
a. The valve disk should be open while installing the seal ring. If not, rotate the disk to the open position as shown in
figure 8.
b. Hook the spring ends together, insert the spring (see figure 9) into the groove in the seal ring, and work the
spring into the recess in the PTFE seal ring.
DISK STOP
ACTUATOR
END OF SHAFT
DISK POSITION
INDICATOR
DISK IN THE
CLOSED POSITION
RETAINER
RING
DISK IN THE
OPEN POSITION
8540 Valve
September 2021
13