Marwin Valve CF8901 Series Three Piece Ball Valve - Manual (Page 2)

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3. In order to prevent damage, protective plastic
covers on valve ends should not be removed
until immediately prior to installation.
4. It is advisable to store the valves in waterproof
conditions. Ball valves should be protected to
safeguard against humidity, moisture, dust, dirt
sand, mud, salt spray and seawater.
5. All valves equipped with actuators shall be
stored in dry conditions.
6. Valves to be stored for a long period of time
should be checked by the quality control
personnel every six months; every three months
when valves are automated.
Maintenance During Storage Period
• Internal surface should be inspected to check
for dust or other foreign objects.
• Rust or dust must be removed by cleaning
with proper solvent.
• After cleaning, ball valves must be lubricated
with an adequate lubricant.
• Ball valves should be operated for at least two
complete cycles before installing or returning
to storage.
Installation
The ball valves may be installed in any position
using standard pipe fitting practices.
Caution: Before installation of the valve:
1. Pipe must be free of tension both during and
after installation.
2. Pipe must be flushed to clean dirt, welding
residues, etc. which would damage ball or seats.
3. The valve should be kept in OPEN POSITION
during installation and protective plastic covers
must be removed only at the moment of
installation.
4. If the valve was specified to be tested per ASME
16.34, there may be some trapped water be-
tween the ball and the body cavity. This can be
removed by partially opening the valve, thereby
exposing the cavity to the through port of the
ball.
 Installation of Tri-clamp Ends
5. Be sure only specified gasket and clamp, suitable
for application rating, are used.
6. Be sure gasket is properly seated before
tightening clamp.
 Installation of Weld-End Ball Valves
7. It is recommended that tube weld end valves
be welded in line using orbital welding. This
can be done without disassembling the valve.
8. Other welding methods may not be feasible
due to the thin wall of the tubing. If other
methods are used, the valve and connecting
pipe should be aligned, then the center
section of the valve dropped out during
welding to prevent heat damage of seats and
seals.
Manual Operation
1. Open and close the valve by turning the handle one-quarter
turn (90°).
2. Valve is in open position when handle is in line with
the pipe.
3. Valve is in closed position when the handle is per-
perpendicular to the pipe.
Maintenance
Before starting maintenance, please read
information contained in the Caution Section of
the manual.
1. Open and close the ball valve at least once to
release the pressure completely from valve body.
2. Ball valves, if correctly used, normally do not
need any internal lubrication and maintenance.
However, when necessary, ball or seats can be
replaced by qualified personnel following the
instructions of this manual.
3. For further information, please refer to the
cross section view and parts list.
Valve Disassembly
A. To inspect and / or Replace Body Seals,
Seats, Packing & Ball
Reference cross section view for parts identification
1. Valve must be in the open position.
2. Remove one body bolt (9) opposite hinge point
and loosen all others. This will allow center
section to swing out.
3. Close the ball and remove seats (4), ball (3),
and body seals (5). Be careful not to damage
the ball.
4. Remove the handle nut (14), handle (15), lock
washer (20), stem nut (13), gland bushing (19),
and stem packing (8).
5. Push the stem (6) into the body (1). Remove
thrust washer (7) from stem.