1511 Series - Maintenance Manual

XII. Continued8. Remove the cap screws or stud nuts holding the yoke to the base and raise theyoke over the spindle.9. Remove the spring and spring washer assembly, record the spring numberstamped 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 thebushing 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 thethreads disengage.14. Remove the lower adjusting ring. The valve is now completely disassembled.Do not disassemble valvewith pressure in drum orheader, as this will resultin severe personal injury ordeath.XIII. InspectionA. General InformationOnce the valve is disassembled, the appropriate parts can be inspected for damageand their suitability for reuse.B. Specific Steps1. Inspect the guide inside diameter for egging, and insure the inside surface issmooth. The threads on the outside must be in good condition to insure theadjusting ring/guide will adjust when the valve is hot. If serious, large scalegalling or ridges corresponding to the grooves in the disc are present, the partshould be replaced.2. Disc :The 1511 Consolidated Safety Valve is designed with a Flat Solid Disc (FSD) ineither a low pressure (LP) or high pressure (HP) version.(LP)Table 2Disc1511FSD(HP)14 | Dresser Consolidated ®