Consolidated 1811 Series Safety Valve Instruction Manual
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X. Disassembly of 1811 Series Safety Valve
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 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.
