Table of Contents
Introduction .................................................................................................... 3
Warnings, Cautions, & Notes ........................................................................................... 3
Scheduled Service ........................................................................................................... 3
General Guidelines ........................................................................................................... 3
Initial Inspection Procedure .......................................................................... 4
External Inspection ........................................................................................................... 4
Pressure Test .................................................................................................................... 4
Disassembly Procedures ............................................................................... 5
Valve Disassembly Procedure - Revision A ...................................................................... 6
Valve Disassembly Procedure - Revision B ...................................................................... 7
Reassembly Procedures .............................................................................. 10
Final Adjustment & Testing Procedures..................................................... 15
Second Stage Air Flow Test ............................................................................................ 17
Second Stage Opening Effort Test ................................................................................. 17
Second Stage Purge Flow Test ...................................................................................... 17
External Leak Test .......................................................................................................... 18
Subjective Breathing Test ............................................................................................... 18
Table 1 – Troubleshooting Guide ................................................................ 19
Table 2 – Recommended Tool List .............................................................. 20
Table 3 – Standard Parts Replacement Schedule ..................................... 20
Table 4 – Torque Specifications .................................................................. 21
Table 5 – Test Bench Specifications ........................................................... 21
Procedure A – Cleaning & Lubrication....................................................... 22
Table A – Recommended Lubricants & Cleaners ...................................... 23
Second Stage Schematic ............................................................................ 25
