IOM-DM MPT100-2018
Page 4
Valve Reassembly -
Note- the valve may be reassembled and operated dry when no lubricants are allowed in the system;
however, a light lubricant on the ball and stem will aid in assembly or reduce initial operating torque.
Lubricant used must be compatible with the intended system fluid.
1.
Install the thrust bearing on stem O.D.
2.
Install stem packing in valve body.
3. Slide the Ball & Stem into the stem bushing.
4. Install the seats inside each seat pocket of the end caps make sure the spherical curvature side of the
seat will face the ball.
10. Turn the ball so that the ball opening is parallel to the port centerline.
11. Assemble the end cap onto the valve body, loosely tighten End Cap Nuts.
Place remaining seats to
correct end caps and gradually tighten all three end caps in rotation, using a crisscross pattern on each
end. Do not fully tighten one end cap, bring them all up gradually.
NOTE:
Be careful not to damage gasket when putting end cap into the body.
12. Tighten packing gland, ensure valve operates smoothly
Note:
Valve must be in the 100% full open position.
13. Install, lock washer, stem nut, packing follower, stem packing & thrust bearing.
14. Install Lever.
Note:
Make sure ball is in closed position before tightening up the end connections.
WARNING
Extreme care must be exercised during tightening of the body end nuts to make sure that complete
engagement of studs with the body flange is maintained. There should be at least one stud thread
exposed on each side.
Cycle the valve slowly, with a gentle back and forth motion to build gradually to a full quarter turn. By
cycling slowly, the new seat lips will conform to the seal shape against the ball. An initial fast turning
motion, at this point, may cut the seats before they have a chance to form the proper seal. When possible
and practical, test the valve prior to reinstalling into the pipeline.
Reinstallation
-
Carefully inspect the faces of both the valve flanges and the mating flanges to ensure they are clean and
undamaged. Place the valve in the preferred position and support it from moving. Install a sealing gasket
between each pair of flanges and reinsert the bolting and hand tighten. Secure the bolting to the
recommended torque values in a star pattern to ensure that the gasket is compressed evenly around the entire
circumference.
Содержание DM MPT100SS
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