Argus
Maintenance
14
Type FK/78
FK78-02-001
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 (visible notch crosswise the direction of flow).
f Remove snap ring (22).
f Unscrew hexagon nuts (16) with lock washers (9).
f Take off plate (11) with wiper ring (53), bearing tape (38) and sealing ring (42), thrust ring (18) with
sealing ring (49) as well as straight pin (7).
∗∗
f Press stem (31) with round keys (32) downwards and take out of the body.
f Unscrew hexagon nuts (20) from body (2).
f Remove body (2) O-ring (51) and sealing ring (57) from body (1).
f Remove ball (30), counter-bearings (14, 39) with wearing rings (37, 52) and bearing tapes (36, 40),
annular piston (50), Belleville spring washers (21, 17), intermediate ring (45), O-ring (47) and bearing
ring (43).
Exchanging the Stem Sealing
Proceed as per Disassembly until
(∗∗)
.
f Take off ring (43), O-ring (47) and exchange.
f Depending on the actual requirements, a partial disassembly of the ball valve might be sufficient.
Reassembly
f Insert Belleville spring washer (21) and annular piston (50) in body (1).
f Place ball (30) as well as lower counter-bearing (14) with bearing tape (40) and wearing ring (52) in
body and turn to the OPEN position.
f After having assembled counter-bearing (39) with bearing tape (36) and wearing ring (37), insert stem
(31) with round keys (32) in body from below.
f To continue reassembly, proceed in reverse order as described in disassembly.
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