Argus
Maintenance
13
Type FK/76
FK76-02-001
Danger!
Do not disassemble the valve under pressure. Before disassembly operate valve so that possible
pressure behind the ball may escape.
Disassembly
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Stem (31) should be in CLOSED position.
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Remove snap ring (22) and stop disk (10).
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Unscrew hexagon screws (15). Take off plate (9) with wiper ring (41), thrust ring (18) with bearing tape
(55) and sealing ring (49) as well as dowel pins (7, 12).
∗∗
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Unscrew cheese-head screws (16).
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Take off plate (11) with ring (43), O-ring (47), ring (45), Belleville spring washer (17), sealing ring (49),
ring (44) and stem (31), flange sleeve (59) and compression spring (56).
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Unscrew hexagon nuts (20) from body (2).
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Remove body (2), O-ring (51) and sealing ring (57) from body (1).
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Remove ball (30) with 4 round keys (34), counter-bearing (14) with flange sleeve (40), annular piston
(50) with optional O-ring (48) and Belleville spring washers (21).
Exchanging the Stem Sealing
Proceed as per Disassembly until
(∗∗)
.
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Take off ring (43), O-ring (47) and exchange.
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Ring (45) and compression spring (17) can be left in cover plate.
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.
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To reassemble, proceed in reverse order.
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