Flowserve Argus Ball Valves - Manual (Page 12)

Argus
Maintenance
12
Type FK/75
FK75-02-001
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 snap ring (22) and stop disk (10).
f Unscrew hexagon screws (15).
f Take off cover plate (11) with wiper ring (41), bearing tape (55), sealing ring (42), thrust ring (18),
bearing tape (55), sealing ring (49) as well as dowel pins (7, 12). ∗∗
f Unscrew hexagon nuts (20) from body (2).
f Remove body (2), O-ring (51) and ring (57) from body (1).
f Remove ball (30), bearing seats (13), annular piston (50) and Belleville washers (21).
f Press stem (31) downwards and take them out of the body together with bushing (59) and thrust ring
(44).
f Remove rings (43, 45), O-ring (47) and Belleville washer (17) upwards.
Exchanging the Stem Sealing
Proceed as per Disassembly until (∗∗) .
f Take thrust ring (43) and O-ring (47) off.
f Ring (45) and compression spring (17) can be left in body.
When using a PTFE seal instead of O-ring (47), item (43) can be left out.
Items (45) and (17) will then be replaced by a fill ring.
Depending on the requirements, a partial disassembly of the ball valve may be sufficient.
f To reassemble, proceed in reverse order.