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Baker Hughes
© 2020 Baker Hughes Company. All rights reserved.
Do not disassemble valve
with pressure in drum or
header, as this will result
in severe personal injury
or death.
Before removing the valve, be sure there is no steam pressure in the drum or
header, then proceed as follows:
1. Remove the lower ring pin.
2. Turn the lower ring upwards counting the number of notches moved until contact
is made with the disc. Record this information for use during reassembly.
3. Remove the lever pin and lever.
4. Loosen the cap screw(s) and remove the cap.
5. Remove the release nut and lock nut or cotter pin.
6. Measure the distance from the top of the spindle to the top of the compression
screw. Record this for use in reassembly to restore the correct spring
compression.
7. Loosen the compression screw lock nut and remove the compression screw.
8. Remove the cap screws or stud nuts holding the yoke to the base and raise the
yoke over the spindle.
9. Remove the spring and spring washer assembly, record the spring number
stamped in the spring. Mark the spring and washers top and bottom.
10. Lift the disc and spindle straight up to remove the disc from the valve body.
Engage the drop through threads of the disc and unscrew it from the spindle.
11. Measure from the top of the combination guide and upper ring to the top of the
bushing seat. Record this measurement for reassembly.
12. Remove the upper ring pin.
13. Remove the combination guide and upper ring by turning it upwards until the
threads disengage.
14. Remove the lower adjusting ring. The valve is now completely disassembled.
X. Disassembly of 1511 Series Safety Valve
A. General Information
The 1511 safety valves are easily maintained. Normal
maintenance usually involves:
• Disassembly
• Cleaning
• Component Inspection
• Lapping the Seats
• Reassembly
• Setting, Testing and Resealing the Valve
Occasionally, remachining the seat bushing may be
necessary to extend the service life of the valve. In any
case, keep all parts for each valve together or marked to
ensure that they are replaced in the same valve.
The following tools are recommended for normal
maintenance and following remachining:
1. Flat lapping plate, (for resurfacing ring laps) - Part
Number 0439004
(1)
2. Grinding Compounds
(1)
3. High temperature thread lubricant
(1)
- (Fel-Pro, Nickel
Ease, or equivalent)
4. Two (2) ring laps per valve size and type
(1)
1. See maintenance Tools and Supplies in Section XVI.
XI. Maintenance Instructions
