Fisher A41 Instruction Manual page 18

Figure 9. Available Seal Configuration
RETAINING
RING
PRESSURE-ASSISTED
SEAL
HIGH PRESSURE
SHUTOFF
DISC
FACE
B1558-3
NPS 2 METAL SEAL
GRAPHITE
GASKET
(KEY 16)
RETAINING
RING
(KEY 2)
UNIDIRECTIONAL SEAL
NOVEX METAL SEAL
A6360-1
3. Installing the retainer ring:
a. Valves with PTFE seal rings do not require a retainer ring gasket (key 16).
b. Valves with metal seals require a retainer ring gasket (key 16). The gasket is not pre-punched for insertion of
retainer screws. The holes are not necessary for press-fit retainer rings.
CAUTION
When handling the new retainer ring gasket, be sure to avoid kinking, cracking, or breaking the gasket. Damage to the
gasket can cause leakage between the seal retainer and valve body.
c. Lay the gasket (key 16) down so that it is accurately centered on the valve body.
4. For valves with press-fit retainer rings
a. Wipe excessive oil off the retainer ring outside diameter, and off the retainer counterbore in the valve body.
b. Rotate the disc to the open position.
18
RETAINING
RING
(KEY 2)
VALVE BODY
VALVE
BODY
GRAPHITE
(KEY 1)
GASKET
(KEY 16)
SEAL RING
(KEY 4)
BACKUP
O-RING
(KEY 15)
HUB SIDE
OF DISC
HIGH
PRESSURE
SHUTOFF
FLOW DIRECTION
SPRING
(KEY 5)
DISC FACE
BIDIRECTIONAL SEAL
PTFE SEAL
RETAINING
RING
RESILIENT
INSERT
BIDIRECTIONAL SEAL
PHOENIX III METAL SEAL
VALVE
BODY
(KEY 1)
SEAL
RING
(KEY 4)
VALVE
BODY
(KEY 1)
SEAL RING
(KEY 4)
HUB SIDE
OF DISC