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Contents
Disclaimer

INTRODUCTION
The Nevil Norway Mystic Mechanic Method
What If you don’t want to work on your regulator?
A Warning

Chapter 1 HOW A REGULATOR WORKS
The Demand Regulator
[A Basic Demand Regulator]
Ambient Compensation
[The Rouquarol - Danayrouze Apparatus]
The Single Stage Regulator
[Single Stage "Mistral" Regulator]
[A Constant Output Regulator]
Constant Output Regulators
Two Stage Regulators
[Two Stage Regulator]
Some Nomenclature
[Upstream and Downstream Valves]
Upstream and Downstream
Overpressure Valve (OPVs)
Diaphragm vs Piston
[How a Regulator Works - Balanced Piston]
[How a Regulator Works - Balanced Diaphragm]
[Non-Balanced Piston First Stage]
Which Is Best?
[Classic Downstream Second Stage]
Second Stages
[Barrel Poppet Second Stage]
[Tilt Valve Second Stage]
Other Patterns
[Scubapro Balanced Coaxial Flow Valva]
[Servo Valve Second Stage]
Adjustable Seconds
[External Adjuster On a Barrel Poppet Second]
["Adjuster Within the Adjsuter" Style]
Balancing
[Pressure Balancing a Stage]
[Balancing an Upstream Valve]
[Balanced Piston]
[Balanced Coaxial Flow Valve]
[Venturi Assist]
[Venturi Assist Variations]
Venturi Assist
Desensitizing Switches
Dedicated First Stage Ports
"Work of breathing"
US Navy and CEN standards
- CEN
- US Navy Class B
- US Navy Class A
Positive Pressure Breathing
Regulators for Argon
Gimmicks and Refinements
- Roller tipped levers
- Oversized Hoses
- Nitrox Regulators
Subtleties

Chapter 2 GETTING STARTED
Overview
Setting Up
About The Schematics
Nomenclature
[Nomenclature – First Stages]
[Nomenclature – Second Stages]
Overhauls And Underhauls

Chapter 3 FIRST STAGE OVERHAUL
Identification
Piston First Stages
Non-Balanced Piston (NBP) Firsts
[NBP Yoke/HP Side]
[NBP LP Side]
Cleaning and Inspection
Reassembly
[BP Yoke Side]
Balanced Piston (BP) Firsts
[BP First Stage LP Side]
[BP HP Side]
Cleaning and Inspection
Reassembly
Diaphragm Firsts
Disassembly
[BD LP Side]
[BD Yoke Side]
[BD HP Side]
Cleaning and Inspection
Reassembly
Variations
[Dacor Module Piston-Assisted Diaphragm First]
Dacor Modular First Stages
Removal
Disassembly
Reassembly
Adjustment
Final Assembly

Chapter 4 SECOND STAGE OVERHAUL
Getting Started
1) Remove the cover
[Second Stage Case Parts]
The Purge Assembly
2) Remove the Exhaust Tee and Valve
3) Remove the Hose
4) Identification
Classic Downstream Seconds
[Variations On a Theme: Different Downstream Valve Layouts]
Classic Downstream Overhaul
Disassembly
[Downstream Valve Parts]
Reassembly
Barrel Poppet Seconds
[Barrel Poppet Valve Parts]
Barrel Poppet Second Overhaul
Disassembly
Cleaning and Inspection
Reassembly
[Barrel Poppet Alignment]
Alternate Procedure For Apeks, Zeagle And Similar Seconds
Apeks-Style Reassembly
Tilt Valve Seconds
Other Configurations
Soft Parts
The Hose O-Rings
Variations
Trouble Spots

Chapter 5 TUNING THE REGULATOR
Overview
Single Adjustment Seconds
[The Single Adjustment Downstream Second]
Two Adjustment Seconds
[The Two Adjustment Downstream Second]
Barrel Poppet Second Stages
[A Barrel Poppet Second]
Upstream Seconds
Tuning the First Stage
The Second Stage
Getting At the Adjustments
Lever Height
Spring Pressure
Settling effect
Tuning the Second
Classic Downstreams
- Basic adjustment sequence for a classic downstream 2nd
Barrel Poppets
- Typical adjustment sequence for a barrel poppet 2nd
Tilt Valves
Other Patterns
- External Adjustment Seconds
Adjusting the Venturi Boost
Octopuses
Finishing Up
Cracking pressure
Leak Test
Vacuum Test
Flow Testing
The Hand Test
Logging It
Fine Points
Which adjustment?
Lever Height and Cracking Pressure
Using the IP to Adjust Cracking Pressure
Modifying Spring Pressure

Chapter 6 PROCEDURES AND TECHNIQUES
I) Pre-Servicing Tests and Inspection
Exterior Inspection
Testing
- Intermediate Pressure
- Leakage Test
- Breathing Or Cracking Pressure
2) Loosening Stuck Parts
- Chemical
- Heat
- Mechanical
3) Cleaning
The Detergent Bath
The Acidic Bath
The Neutralizing Bath
Rinsing
Drying
Solvents
Contamination
The Regulator from Hell
5) Inspection
6) Lubrication
Anti-seize
7) Tightening Things
Torquing
Thread sealants
Tightening First Stage Diaphragm Retainers
8) Intermediate Pressure
Adjusting the Intermediate Pressure
IPs for Cold Water
9) Installing Environment Sealing Kits (Cold Water Kits)
Piston First Stages
- With the Stage Disassembled
- With the Stage Assembled
Diaphragm Firsts
[Environmental Sealing]
- Procedure for Non-EFA Spiro and Other Similar Diapragm Firsts
- Procedure for EFA Spiro Firsts
- Poseidon
Other Systems
10) Cracking Pressure
The Water Test
11) Flow Testing
13) Final Testing
- 1. Hand test
- 2. Vacuum test
- 3. Breathing test
- 4. Purge test
- 5. Leak test
- 6. Water or Magnehetic Test
- 7. Recheck IP
14) Routine Maintenance
Rinsing
- How Long?
Pool Use
Keeping Water Out Of the Regulator
Drying
Storing
A Really Neat Idea
Neat Idea 2
And One Not-So-Bad One

Chapter 7 SERVICING REGULATOR COMPONENTS
Inlet Filters
Snap and Lock Rings
[Installing Lock Rings]
Seats
The Low Pressure Seat
The High Pressure Seat
Balance Chambers
[Typical Purge Assembly]
Purge Assemblies
Exhaust Valves
The Care and Handling Soft Parts
More About Cold Water Kits
Plastic
Hoses
Dust Caps
Yokes and DIN Connectors
Yokes
[Typical DIN Connectors]
DIN Adaptors
Dedicated Nitrox DIN Connectors
Shims
Fabricating Parts
[Commonly Used SCUBA O-Ring Sizes]

Chapter 8 O-RINGS AND OTHER SEALS
Static or dynamic?
[Extrusion]
Extrusion
Backup Rings
[O-ring Defects]
The Care and Handling Of O-Rings
Bullets and Cones
[The Bullet Tool]
[Transferring an O-Ring]
Lubricating O-Rings
Materials Specifications
Color
Buying O-Rings
Generics
Sizing O-Rings
[AS 586 (Dash-Two) O-Ring Sizes]
Other Problems
O-Rings For Oxygen And Nitrox Service
Packing Seals And Gaskets
Other Seals
One Last Caution, Again

Chapter 9 TOOLS
Basic Tools
First Stage Holders
Soft Jaws
Wrenches
Yoke Nut Wrenches
Pin Spanners
Face Pin Spanners
Collar Wrenches
[Collar Wrench]
Second Stage Cover Wrenches
Torque Wrench
Crowfoot Wrenches
Drag Link Tool
Hex Keys (Allen Wrenches)
Valve Nut Tool
Hemostat
Strap Wrenches
O-Ring Tools
Picks
Bullets and Cones
Brushes
Abrasive Sticks
[Hose Protector Installation Tool]
Hose Protector Installation Tools
Port Plugs
Cutaway Sockets
Drifts, Crown and Bushing Installation Tools
[Insertion Tools - Official..]
[.....And Improvised]
Poppet Holders
Second Stage In-Line Tool
Other Tools
Spiro Downstream Tool
2nd Stage Multi-Tool
[Typical Dedicated Service Tools]
Test Equipment
Intermediate Pressure Gauge
[DIY Intermediate Pressure Gauges]
Tank Valve Adaptor/ Test Block
Magnehelic Gauge
Workstations
Flow Benches
Pressure Pot
SPG Tester/General Purpose Test Gauge
Chemicals
Lubricants
Lubricants For 02 Service
Spray Lubes
Cleaning Solutions
Solvents
Ultrasonic Cleaners
Snoop
Air
Thread Lockants
Anti-Seize
Protectants
Tools For The Dive Bag

Chapter 10 DIAGNOSIS
- Performance Problems
- Leakage or Wet Breathing Problems
[On-Balanced Piston Firsts]
[Balanced Piston Firsts]
[Balanced Diaphragm Firsts]
[Second Stages]
First Stage Checks
Intermediate Pressure
Checking the Filter
Crud, Corrosion, or Worn Parts
The Hose
Second Stage Checks
Leaking or Freeflowing
- Lever too high
- Poppet Spring Pressure Too Low
- Orifice O-ring Leaking
- Balance Chamber O-ring Leaking
High Inhalation Effort
- Lever Too Low
- Poppet Spring Pressure Too High
- Lousy Regulator
High Exhalation Effort
- Sticking Exhaust Valve
Wet Breathing
Air Leaks
Air Leakage From the Ambient Chamber (Piston Regulators)
- High or Low Pressure O-ring
Leakage From the Spring Chamber (Diaphragm 1st)
Free Flow After Purging
Moaning
Shuddering
Whistling
Burping
Scratches
None Of The Above
Possessed Regulators
[Automatic First Stage Inlet Valve Closure Devices Update]
[Aqualung ACD]
[Oceanic DVT]

Chapter 11 VALVES, TANKS AND GAUGES
Removing the Valve
The Dip Tube
Diagnosis
[Valve Diagnosis]
J (Reserve) Valves
Valve Overhaul Procedure
Disassembly
Reassembly
The Yoke Valve Face Seal O-Ring
Stuck Yoke O-Rings
The Tank Neck O-ring
DIN Valves
Burst Disks
Leaks
Tanks
Inspection
[Tanks Made With 6351 Alloy (A Partial List)]
Neck Cracks
Hydrotesting
[Tank Markings]
The 10% Overfill "Plus" Rating
Tumbling
[A Tank Tumbler (top view)]
Hydro After Tumbling?
Dealing With Tank Odors
Painting Tanks
Gauges
Spools and Restrictor Orifices
Calibration

Chapter 12 SERVICING REGULATORS IN A NON-SHOP ENVIRONMENT
Obtaining Parts
Stockpiling Parts
Alternative Parts Sources
Service Literature
Other Sources Of Information
Recalls and Revisions
Manufacturers’ Tech Courses
"Equipment Specialist" Courses
"There aren’t no parts available for that model no more"

Chapter 13 REGULATORS BY MAKE
Abysmal Diving
Apeks
Intermediate Pressure
Second Stage Adjustment
Atomic
Intermediate Pressure
Second Stage Adjustment
Dacor
Intermediate Pressures
2nd Stage Adjustment
Dive Rite
Genesis
Oceanic
Peculiarities
Intermediate Pressure
Second Stage Tuning Settings
Mares
Intermediate Pressure
Second Stage Adjustment
Final Tests
Poseidon
Intermediate Pressure
Second Stage Adjustment
Scubapro
Intermediate Pressures
2nd Stage Tuning Procedure
[Torque Specs]
Sherwood
Intermediate Pressure
Checking the Dry Air Bleed
2nd Stage Adjustment
Lever Height
Spiro (Aqualung/USD and Seaquest)
USD (Aqualung) Models
Intermediate Pressures
Second Stage Adjustments
Zeagle
Intermediate Pressure
Second Stage Adjustment

APPENDICES
1. Glossary
2. Sources
Scuba Gear Manufacturers
3. Buying A Regulator
So What To Buy?
Regulators To Avoid
Mail Order Regulators?
4. No-Machining NPT (National Pipe Thread) to SCUBA Straight Thread Adaptor
[No-Machining NPT (National Pipe Thread) to SCUBA Straight Thread Adaptor]
5. Schematics (Following Pages)
[Apeks, Zeagle – Balanced Diaphragm Firsts]
[Atomic T1, B1, Z1 – Balanced Piston First]
[Dacor 960]
[Genesis Dry Air Demand]
[Mares MR22/Ruby– Balanced Diaphragm Second]
[Oceanic Sport – Non-balanced Piston First]
[Oceanic – Balanced Diaphragm First]
[Poseidon – Balanced Diaphragm First]
[Poseidon Xstream – Self-Balanced Diaphragm First]
[Seaquest Mirage UBP]
[Spiro Sea /Spectrum – Balanced Diaphragm 2nd]
[Sherwood – Piston First Stages]
[Sherwood – First Stages With External IP Adjustment]
[Sherwood – Flow Control Element Variations]
[Sherwood – Moving Orifice Variations]
[Scubapro MKV, OCEANIC BP et al – BP Firsts]
[Scubapro MK20/25]
[Scubapro MK14/16/18 – Diaphragm 1sts]
[Apeks, Zeagle – Barrel Poppet Seconds]
[Atomic TI, Bl, Z1 – Barrel Poppet Second]
[Mares Ruby/Abyss/Voltrex – Downstream Second]
[Oceanic Delta II – External Adjustment Downstream 2nd]
[Poseidon Jetstream / Odin – Servo Valve Second]
[Scubapro S550, S600 and S600T]
[Scubapro G190]
[Scubapro G250, G200, G200B, 109 and BA]
[Sherwood – Downstream Second Stage]
[Spiro – Basic Downstream]
[USD Micra, Micra ADJ – Barrel Poppet Second]
[Valves – "K" and "J " (Reserve)]

INDEX

Other Airspeed Press Publications




Pär Ahlgren
Pär Ahlgren 2010-02-13 15:32:41
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Huvudinlägg Rec. "SCUBA REGULATOR MAINTENANCE AND REPAIR" Pär Ahlgren 2010-02-13 15:29
svara Fullständig innehållsförteckning för intresseradePär Ahlgren2010-02-13 15:32

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