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BZ9 Series Ball Valves
IOM-BZ9
IN-LINE LEAKAGE
Check that the valve is fully closed. If leakage occurs
while the valve is in the closed position, a seat or
ball sealant surface may be damaged and it will be
necessary to disassemble the valve.
NOTE: If Stem leakage and leakage at body joint are
not cured by the simple means described above, it will
be necessary to dismantle the valve. If there is no stem
leakage the stem assembly should not be touched.
REBUILDING
Before rebuilding, check that all the correct components
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When rebuilding, cleanliness is essential to allow long
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CAUTION: NO BODY OR STEM SEALS ARE REUSABLE. Care
must be taken to avoid scratching the seats and seals
during installation.
NOTE:
Caution must be taken with valves that
have been in hazardous media. They must be
decontaminated before disassembly by relieving the
line pressure and flushing the line with the valve in
the partially open position. Protective clothing, face
shields, gloves, etc., MUST BE USED for this operation.
A
DISASSEMBLY OF VALVE
(Removed from line)
1.)
Remove the End Connectors (#2) by
removing the Body Bolts (#9) and Body Bolt
Nuts (#10).
2.)
Once the End Connectors (#2) have been
separated from the Body (#1), remove the
Seats (#5) and Body Seals (#13).
3.)
Make sure the Ball (#3) is in the closed
position, thus the Ball (#3) can be taken out
easily from the Body (#1).
B
REMOVING STEM ASSEMBLY
1.)
Remove Handle (#8) by removing Handle
Nut (#15).
2.)
Remove the Washer (#17), Gland (#7), &
Stem Seal (#6).
3.)
Push the Stem (#4) down into the body
cavity to remove. Once removed take off the
O-Rings (#11) and Thrust Washer (#12).
C
INSPECTION
1.)
The ball and the surfaces against which the
seats wipe and make contact should be free
of pit marks and scratches. Light marring from
the action of the ball against the seats is normal
and will not affect the operation of the valve.
2.)
The stem and body surfaces, which the thrust
washer and Stem Seals make contact with,
should be free of pit marks and scratches.
D
REASSEMBLY
1.)
Apply an adequate amount of lubricant
compatible with the media being handled
around the Ball (#3), Seats (#5), Stem (#4),
Thrust Washer (#12), and O-Rings (#11).
2.)
For stem reassembly, disassembly procedure
should be followed in reverse order.
3.)
When stem assembly is complete, tighten
Stem Nut according to the values in Table A.
4.)
With the Stem (#4) in the close position, insert
the Ball (#3) into Body (#1) so that stem slot
engages with the tang at the base of the Stem
(#4).
5.)
Insert Seats (#5) and Body Seals (#13) into
the Body (#1).
6.)
Merge the End Connectors (#2) with the
Body (#1).
7.)
Insert and tighten Body Bolts (#9), and Body
Nuts (#10), in accordance to the cross
pattern procedure shown in Diagram A.
8.)
In the final assembly step ensure that the Body
Bolts (#9) and Body Bolt Nuts (#10) are
tightened according to the torque values on
Table A and Bolt Tightening sequence as noted
in Diagram A.
3
INSTALLATION, OPERATION & MAINTENANCE FOR SVF SERIES BZ9 BALL VALVES