Flowserve Argus Ball Valves - Manual (Page 10)

Argus
Maintenance
10
Maintenance
Type EK/71
EK71-02-001
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 disk (7).
f Detach screws (8, 9) with bush (5).
f Remove cover plate (6) with sealing ring (43), on DN 32-50 with bearing tape (34) and dowel pin, as
well as thrust ring (11) with sealing ring (35). ∗∗
f Unscrew flange connection (2) with sealing ring (33) and O-ring (37) from body (1) using a special
ARGUS tool (eccentric).
f Remove ball (21) and sealing rings (31).
f Press stem (22) downwards and take it out of the body together with bushing (36) and disks (38).
f The O-ring (32) and disk (39) are removed upwards.
Exchanging the Stem Sealing
Proceed as per Disassembly until (∗∗) .
f Then exchange disk (39) and O-ring (32). When using a PTFE seal instead of O-ring (32), item (39)
can be left out.
Depending on the requirements, a partial disassembly of the ball valve may be sufficient.
f To reassemble, proceed in reverse order.