•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.
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
a.Marwin recommends
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.
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:
•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
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.
Manual Operation
1.Open and close the valve by turning the handle
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
B. Inspection and Replacement
With the valve completely disassembled, clean and examine all components: