Updated layout and diagram.
Updated layout.
1.1.1 Overpressure Relief Valve
Change type: Documentation clarification
Updated reference for illustrated drawings:
Old: Exploded view referenced broadly in KMDSI Helmet and Band Mask manuals.
New: Explicit reference to P/N 225-017 Overpressure Relief Valve Rebuild Kit instructions.
Minor wording edits (no technical or procedural impact).
1.1.4 Overpressure Relief Valve Lift Check / Setting
Change type: Procedural overhaul
Testing Method
Old: Lift check performed using:
Adjustable first-stage scuba regulator or scuba test stand
Intermediate pressure gauge at the first stage
New: Lift check performed using:
Surface-supplied gas via control console
Umbilical connected to helmet
Hand-loader/regulator on the console for pressure control
Procedure Structure
Old: Pressure raised and adjusted directly at the first stage regulator.
New: Pressure increased topside through the console; valve response verified at the helmet side block.
Safety & Controls
Added explicit warning that the OPRV must only be installed in a low-pressure port of KMDSI side blocks.
Added controlled pressure ramping guidance (bubble observation, incremental screw adjustments).
Added explicit pressure reset steps (drop to 145 psig between adjustments).
Documentation Expansion
Section expanded from text-only to multi-page, step-by-step procedure.
New photographic figures illustrating each major step.
Clarifies rationale for abandoning first-stage testing (precision, reduced regulator stress).
Corrected the last paragraph in section 1.1.1 Overpressure Relief Valve to refer to "the following text" rather than a specific page number.
