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• 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 Practice.
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. Before shipment, the ball is lubricated with a pure
Vaseline oil. This can be easily removed with an applica-
tion compatible solvent if required.
5. If the valve was specified to be tested per ASTM 16.34,
there may be some trapped water between 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.
6. Special care should always be taken when installing
automated ball valves that the ball is in the proper
position.
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 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 SPARE PARTS
LIST Section.
Valve Disassembly
A. To inspect and/or Replace Body Seals, Seats, Packing & Ball
Reference exploded view for part identification.
1. Valve must be in the open position.
2. Remove valve from line.
3. Remove bolts (16) securing end cap and separate end caps
(13) from body (12).
4. Close the valve and remove ball (9), seats (10), body seals
(11) and second body seals (18). Be careful not to damage
the ball.
5. Remove the handle nut (2), handle (1), stem nut (14), spring
washers (4), gland (6), and packing (3).
6. Push the stem (5) into the body (12). Remove o-ring (8) and
thrust washer (7) from stem.
B. Inspection and Replacement
With the valve completely disassembled, clean and examine all
components:
2. Lift out the valve body and seat per disassembly section in
this procedure and complete the welding.
3. Allow welds to cool.
4. Reassemble valve per section in this procedure and inspect
for easy operation.
5. Extended end valves may be welded into place without
disassembly using the following guidelines:
Installation of Threaded Ends
1. Unless otherwise specified, pipe threads are American Na-
tional Standard Taper Pipe Threads (NPT) per ANSI B1.20.1,
and require that a pipe sealant be used.
2. Use an anti-seize thread sealant to seal and prevent galling.
a. Marwin recommends PTFE-based liquid sealant or
Grafoil tape as thread sealants.
b. Notes:
1. Use all pipe sealant products in accordance with the
manufacturer’s instructions and good piping prac-
tices.
2. Correct lubrication of stainless steel pipe threads is
especially important to prevent galling.
3. To prevent distortion or damage to the valve, do no apply torque
through the valve. When tightening valve, use wrench on the
end nearest the pipe being tightened.
4. Always leak test the system before using.
Installation of Welded-End Ball Valves
1. Tack weld in four points on both end caps.
• Valve must be in the full open position.
• Limit continuous weld time to 1 minute.
• Direct moving air across finned area or wrap extended
end with wet cloth.
• Check body bolts for proper torque after welds have
completely cooled per assembly section of this procedure.
NOTE: guide for extended valve installation does not apply
to UHMW-PE or Delrin® seats or standard EPDM or
Nitrile body seals due to the low tolerance to high
temperatures of these materials.
Installation of Flanged-Ends
1. Verify valve is in the full open position.
2. Use the appropriate size bolt and heavy hex nut (not
included) as recommended for flange size and class.
3. Flange connection requires gasket (not included).
4. Follow gasket manufacturer’s recommended practice for
tightening flange bolts.