Flowserve Argus Ball Valves - Manual (Page 11)

Argus
Maintenance
11
Type FK/74
FK74-02-001
Danger!
Do not disassemble the valve under pressure. Before disassembly operate valve so that possible
pressure behind the ball may escape.
Disassembly
f Stem (31) should be in CLOSED position.
f Remove thrust ring (22) and stop disk (10).
f Detach hexagon nut (15) with ring (16).
f Remove cover plate (11) with dowel pins (7, 12), bearing tape (55) and sealing ring (42) as well as
thrust ring (18) with sealing ring (49). ∗∗
f Unscrew flange connection (2) with sealing ring (51) and O-ring (52) from body (1) using a special
ARGUS tool (eccentric).
f Remove ball (30), spring washers (21) and annular piston (50).
f Press stem (31) downwards and take them out of body with thrust ring (44) and bushing (59).
f Remove ring (43), O-ring (47), compression spring (17) as well as rings (45) upwards.
Exchanging the Stem Sealing
Proceed as per Disassembly until (∗∗) .
f Remove ring (43), O-ring (47) and replace.
When using a PTFE seal instead of the O-ring (47), item (43) can be left out.
Items (45) and (17) will then be replaced by a ring.
Depending on the requirements, a partial disassembly of the ball valve may be sufficient.
f To reassemble, proceed in reverse order.