2
4. 2600, 2600L, & 2600S
Series Valves
The disassembly of all valves follows the same basic procedure. This
section pertains to 2600, 2600S, and 2600L Series Valves. Please refer
to Figure 1.
1. Place the valve at a suitable height. The work surface should be clean
and strong enough to handle the weight of the parts and the forces
required during disassembly and assembly.
2. Valves should be secured to the work surface to prevent them
from falling over.
3. Remove all wire seals from external adjustments.
4. Unscrew the cap by turning counterclockwise. For valves with open or
packed lever assemblies see Section 6. Remove the cap gasket.
5. Remove the blow down ring lock screw and gasket. Rotate the blow
down ring up on the nozzle and record the number of notches and/or
turns required for it to hit the disc holder. This number will be used
during assembly to place the blow down ring in the proper location.
6. Measure the distance from the top of the spring adjusting screw to the
top of the bonnet. Use this measurement when reassembling the valve
to approximately duplicate the original set pressure.
7. Using a smooth jaw wrench, hold the spring adjusting screw and
remove the spring adjusting screw jam nut.
8. While holding the stem, remove the spring adjusting screw by
turning counterclockwise.
9. Remove the body hex nuts and lift the bonnet (yoke) off the body.
10. Remove spring and buttons. Note: on some valves the upper and lower
spring buttons are different.
11. Pull up on stem and lift out the trim assembly consisting of the sleeve
guide, stem retainer, disc holder, disc and bellows (if so equipped).
12. Hold the top of the stem retainer and pull up on stem and turn
counterclockwise to remove from the stem retainer. Remove the
sleeve guide.
13. Remove the disc from the disc holder by holding the assembly with the
disc facing down and rotating the disc clockwise with the tip of your
finger. The disc will then drop free of the disc holder. See Figure 1 for
details on O ring seat valves.
14. On all but the “D” and “E” orifice bellows valves, the disc holder and
stem retainer are held together by the disc holder lock screw. Insert
the proper size allen wrench into the opening in the disc holder. Turn
the allen screw into the stem retainer clockwise. Mount the disc holder
in a vise using the machined flats on the side. Insert a rod in the hole in
the stem retainer and unscrew the two parts. On bellows valves the
bellows and gasket can now be removed.
15. Turn the body over and remove the nozzle from the body. Remove the
blow down ring from the nozzle.
16. Remove any body drain plugs and bonnet vent plugs.
17. Proceed to Section 7 for instructions on cleaning and lapping.
18. Reassemble valve in reverse order, making sure that lapped nozzle and
disc seating surfaces are not damaged. All threaded connections
should be coated with an appropriate lubricant. Gaskets and O rings
should be replaced.
19. Proceed to Section 8 for testing procedures.
