Instruction Manual
D104709X012
8540 Valve
September 2021
14
ring steps below.
Figure 9. Available Seal Configurations
RETAINING
RING
SPRING
PRESSURE‐
ASSISTED SEAL
HIGH
PRESSURE
SHUTOFF
DISK FACE
VALVE
BODY
SEAL
RING
PTFE SEAL
2.
Installing the retainer ring:
a. Wipe excessive oil off the retainer ring outside diameter, and off the retainer counterbore in the valve body.
b. Rotate the disk to the open position.
c. Lay the retainer ring on the valve body.
d. Use a press, or a soft‐faced hammer to press the retainer ring into its groove in the valve body.
CAUTION
It takes a considerable amount of force with a hammer to drive the retainer ring into place. Be sure not to damage retainer
ring surfaces when installing the ring.
e. The retainer ring is properly seated when the face of the retainer ring is flush with the face of the valve body.
f. To ensure proper seal performance for metal seals, you may need to use the hammer to drive the disk open for
the first few times. When closing the valve, use the C‐clamps discussed in the next few steps.
CAUTION
Do not damage the gasket seating surfaces on either the valve body or the retainer ring when installing or removing the
C‐clamps. Protect the gasket surface by using a soft material between the clamp and valve body/retaining ring serrations
to avoid damage.
g. Use three C‐clamps to hold the retainer in place. Locate one of the C‐clamps near the travel stop in the valve
body, and the other two at 120 degrees from the stop.
h. When cycling the disk for the first three times, use a dead‐blow hammer with a soft head to drive the disk closed.
Also, you may need to use the hammer to drive the disk open for the first few times.
