Flowserve Argus Ball Valves - Manual (Page 15)

Argus
Maintenance
15
Type FK/79
FK79-02-001
Danger!
Do not disassemble the valve under pressure. Before disassembly operate valve so that possible
pressure behind the ball may escape.
Disassembly
f Stem (22) should be in CLOSED position.
f Remove snap ring (12) and stop ring (7). Unscrew cheese-head screws (8).
f Take off plate (6) with sealing ring (43) and bush (36) on DN 20 and 25 or bearing tape (34) and dowel
pin on DN 32-50 as well as thrust ring (11) with sealing ring (35). ∗∗
f Unscrew hexagonal nuts (4) from body (2).
f Take off body (2), O-ring (37) and sealing ring (33) from body (1).
f Remove ball (21) and sealing rings (31).
f Press stem (22) downwards and take it out of the body together with bush (36) and washer (38).
f Removed O-ring (32) and washer (39) upwards.
Exchanging the Stem Sealing
Proceed as per Disassembly until (∗∗) .
f Take off O-ring (32) and exchange bearing ring (39).
When using a PTFE seal instead of O-ring (32), item (39) can be left out.
Depending on the actual requirements, a partial disassembly of the ball valve might be sufficient.
f To reassemble, proceed in reverse order.