GUE Valve Manual

Transcription

GUE Valve Manual

Global
Underwater
Explorers
GUE Valve Manual
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+
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Ver 2.1
Global Underwater Valve Failure Identification and Resolution
by: Dan MacKay
Editors: Alberto Nava, Richard Lundgren, Guy Shockey, Karim Hamza
© 2011 Global Underwater Explorers
This Global Underwater Explorers book is published by Global Underwater Explorers
For information about Global Underwater Explorers publications, contact:
Global Underwater Explorers
15 South Main Street
High Springs, FL 32643
USA
(386) 454-0820
(800) 762-DIVE (3483)
(386) 454-0654 (FAX)
Notice of Rights
All rights reserved. No part of this book may be reproduced or transmitted in any form by any means, electronic,
mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher. For
information on obtaining permission for reprints and excerpts, contact [email protected].
Notice of Liability
The information in this book is distributed on an “As Is” basis, without warranty. While every precaution has
been taken in the preparation of this book, neither the author nor Global Underwater Explorers shall have any
liability to any person or entity with respect to any loss or damage caused or alleged to be caused directly or
indirectly by the instructions contained in this book.
Trademarks
GUE is a registered trademark of Global Underwater Explorers in the United States and other countries.
ISBN XXXXX
10 9 8 7 6 5 4 3 2 1
Valve Manual | III
Contents
Valve Failure Identification and Resolution
1
Introduction �� 1
Definitions�� 2
Manifold System �� 2
Manifold �� 2
Right Side of the Manifold�� 2
Left Side of the Manifold�� 2
Isolator�� 2
Valve�� 2
Regulators �� 2
Detailed Function�� 3
Failures �� 5
Common Failures�� 5
Valve Failure Process
7
Valve Drill (Doubles)�� 7
The diver executing the drill will:�� 7
Valve Drill (Single) �� 8
The drill is conducted as follows:�� 8
General Trouble-shooting Procedure �� 9
Upon discovery of a loss of gas problem:�� 9
Partner (Team) Response:�� 9
Detailed Action for Failures
10
Right regulator repairable��10
Right regulator not repairable ��10
Right side manifold not repairable ��10
Left regulator repairable ��11
Left regulator not repairable ��11
Left side manifold not repairable��12
Erroneous right-side manifold��12
Erroneous left-side manifold��13
No idea where the gas is coming from.��14
Miscellaneous valve procedures ��14
Flow Check ��14
Roll-off Awareness ��14
Isolator Awareness ��14
Afterword��14
Annex A - Manifold Parts Lists
15
IV | Table of Contents
Valve manual | 1
Valve Failure Identification and Resolution
Introduction
The goal of this document is to provide supplemental reading for Global Underwater Explorers (GUE) recreational, technical, and/or cave divers so that they can familiarize themselves with the function and use of a
double outlet isolated manifold. The manifold is a piece of equipment that is fairly innocuous at first glance.
However, an in-depth look at this complex device reveals many modes of operation as well as a host of failure
points. It is essential that all divers who use a manifolded system understand the following:
• Correct operation
• Failure modes
• Emergency procedures
Complete understanding and effective use of a manifold requires a unique combination of knowledge and
physical dexterity as well as high performance team skills.
Figure 1.1: Facing view of a Haclyon dual outlet 300 bar manifold. This manifold is an example of the type of manifold generally used for cave and technical diving purposes.
2 | Global Underwater Explorers
Definitions
Manifold System
A complete gas delivery system including tanks, bands and manifold with regulators attached.
Manifold
The complete metal piece composed of right-side, left-side and the isolator. This includes the three valves, as
well as burst-disks and o-rings. (Figure 1.1)
Right Side of the Manifold1
The post where the right regulator is attached plus the right side valve, burst-disk and other o-rings attached
to this metal body.
Left Side of the Manifold
The post were the left regulator is attached plus the left-side valve, burst-disk and others o-rings attached to
this metal body.
Isolator
The central part of the manifold including the isolation valve. It connects the right and left posts.
Valve
Each manifold has three. These are comprised of a rubber knob, valve stem, all o-rings and the HP seat.
Regulators
Everything from the DIN ‘O’ ring forward.
1 It is important to understand the orientation of tanks and manifolds when indicating failures. For our purposes when a location is indicated it is described from the problem diver’s perspective. For example if we are discussing a right regulator failure,
the regulator in question is the one that is on his/her right side. In other words, the one the diver would touch if the diver
reached back over his/her right shoulder with his/her right hand. Therefore all right hand failures are on the divers right side
and all left side failures are on the left.
Valve manual | 3
Detailed Function
Due to the critical nature of the problems that a malfunctioning manifold presents to a diver, it is important
that the diver has an understanding of the mechanical intricacies of how a manifold is assembled and operates. If we look at the manifold from the aspect of right side, isolator, and left side, the following operating
principles apply:
• The left side mirrors the right side of the manifold in operation and failures.
• Closing either the left or right valve serves only to remove the valve outlet (regulator attachment point)
from the system. This means that if either valve is shut down, gas is still free to transfer from one tank
to the other through the isolator. (Figure 1.2)
• The isolator separates or interrupts airflow from one cylinder to the other. One caveat with the isolator
is that if a failure of the isolator itself occurs via a failed valve stem O-ring, isolating will only protect
the gas contained in the right tank. Due to the way the isolator is engineered gas will slowly leak from
the left hand side, as it has no high-pressure seat to isolate it from the system.1(Figure 1.3)
• For normal dive operations all valves are rotated fully counter-clockwise (open) but not forcibly. The
diver must ensure that the valve does not get jammed open, which can easily occur if too much force is
applied to the valve wheel in the fully open position. This could have potentially disastrous effect when
trying to resolve valve issues while submerged, as the body position of a diver does not allow for much
mechanical advantage.
Figure 1.2: Detailed view of right post. Red arrow illustrates how gas can flow from the tank to
the manifold while by-passing the valve.
1 This arrangement may vary. Not all manufacturers configure the isolator in the same manner. The only way to be absolutely sure
which way your isolator is configured is to remove the knob, valve stem assembly, and the HP seat and inspect the HP orifice
to see which side the valve port is orientated. Orient the isolator as if standing behind the tanks. If the bypass port is on the
left gas loss will occur on the left side, if on the right, gas loss will occur on the right side.
Figure 1.3: Cutaway of a 300 bar isolator. The green arrow on the right displays how the gas flow to the right
side of the manifold can be interrupted by the high pressure seat sealing on the central orifice. The
red left arrow shows that it is not possible for the high pressure seat to seal the left side of the isolator. In the case of a failed primary ‘O’ ring or valve stem ‘O’ ring gas will leak from the valve. Photo
courtesy of Wojtek Filip.
Valve manual | 5
Failures
By far the majority of failures occur with the first or second stages in the form of free flows, first stages that
have become unseated, or loose/damaged hoses, as opposed to an actual manifold malfunction. The greatest
cause of valve issues is a distinct lack of maintenance. Given the exceptional number of failure points associated with a manifold, with most of those being moving o-rings under extreme pressure, it is imperative that
the manifold be included in a biannual inspection and service cycle.
There are three cardinal rules of dealing with manifold failures in particular and leaking gas issues in general:
1. Never manipulate regulators or hoses that are pressurized. This is likely to turn a fixable problem into
a non-fixable problem by cutting captured static O-rings.
2.
3.
Always take sufficient time to clearly think through a manifold issue. It is not uncommon for an inexperienced diver to completely shut down both of a partners regulators, thus creating a critical emergency situation. Taking the time to identify which regulator your partner is breathing from will avoid
an inadvertent shut down, much to your partner’s relief.
Always purge a regulator in order to ensure that it is functioning prior to placing it in your mouth.
In order to simplify the number of failures that can occur with a manifold system we will break them down
into types and categories.
The two categories of manifold failures are:
• Regulator
• Manifold
And these are classed as either:
• Fixable (Regulators may or may not present fixable problems)
• Non-fixable (Some regulator and all manifold issues are not fixable)
Common Failures
Failure identification and resolution needs to be simple and direct in order to work underwater. Divers should
follow simple procedures to contain the failure and communicate the problem clearly in order to allow the team
to take appropriate action during the event.
Gas leaking issues are classified by the location of the source. In one dimension we can indicate the leak by
side; right side or left side. This can be easily communicated to the diver with the failure by tapping him on the
appropriate shoulder or arm and indicating the broken signal. The second dimension for source identification
will be if the problem is on the regulator, or on the manifold and is usually determined by the combination of
the physical input provided by the partner as well as sound.
Some regulator issues are repairable, as for example, an unseated first stage o-ring, however no manifold issues
are repairable. Repairable or not, all regulator issues, once properly handled should be bubble free. On the
other hand all manifold issues will continuously leak bubbles until the gas contained in the offending side has
drained completely. Therefore from a diver’s perspective the source of the problem is simple to identify. It is
either on the right or the left side, and it is either a regulator or manifold based on the presence or absence of
bubbles. That is all that needs to be understood and communicated.
To illustrate the following is an list of possible failures for a manifold system.
1. Right regulator repairable
ºº Unseated first stage O-ring
ºº Loose hose
2.
Right regulator not repairable
ºº Blown hose
ºº Blown O-ring
ºº Free flow
3.
Right side of the manifold not repairable
ºº Burst disk
ºº Tank O-ring
ºº Barrel O-ring
ºº Valve failure
4.
Isolator not repairable
5. Left regulator repairable
ºº Unseated first stage O-ring
ºº Loose hose
6.
Left regulator not repairable
ºº Blown hose
ºº Blown O-ring
ºº Free flow
7. Left side of the manifold not repairable
ºº Burst disk
ºº Tank O-ring
ºº Barrel O-ring
ºº Valve failure
8.
Erroneous right side either repairable or not
ºº Failure actually on the left
9. Erroneous left side either repairable or not
ºº Failure actually on the right
10. No idea where the gas is coming from
Valve manual | 7
Valve Failure Process
Valve Drill (Doubles)
This drill is used to ensure the correct positioning of all valves, the proper operation of the primary and secondary regulators, and to confirm a diver’s capacity for operating the valves. To master the valve drill a diver must
first develop solid situational awareness accompanied with strong fundamental diving skills such as buoyancy
control, trim and maneuvering techniques. The team assumes a formation as dictated by the environment. The
diver who is currently conducting the valve drill will signal to one of their partners to watch them while they
execute the drill. The partner will assume a ready state (be prepared to donate) and indicate OK. From that
position the drill is conducted as follows:
The diver executing the drill will:
1. Purge the alternate regulator to ensure a viable gas source to switch to
2.
3.
4.
Reach back with the right hand and close the primary (right) valve while signaling for attention with
primary light
Remove the primary from the mouth with right hand1
Place the alternate in mouth with the left hand
5. Clip the primary to the right chest ‘D’ ring and pause
6.
Reach back with the right hand, rotate the primary valve to the fully open position
7. Locate and unclip the primary, remove the alternate from the mouth and replace it with the primary
regulator and pause
8.
Reach back with the right hand and rotate the isolator to the fully closed position while signaling for
attention with the primary light
9. Return the isolator to the fully open position and pause
10. Move primary light to a temporary hold in the right hand and signal for attention with primary light
while reaching back with the left hand to fully rotate the alternate (left) valve to the closed position
11. Completely purge the alternate regulator
12.
13.
Reach back with the left hand, rotate the alternate valve to the fully open position
Purge the alternate to ensure that it is functioning
14. Move primary light back to normal position in the left hand
15. Conduct a final flow check including any additional tanks such as stages/deco/dry suit bottles/RB80
switch block and signal OK to terminate the drill
While this seems to be quite a lengthy drill it is simple to remember:
• Always start from the right and work your way to the left
ºº Right side – close, purge, open
1 Confirm valve closure by either purging or breathing the primary regulator until all gas is completely depleted from the
system prior to clipping off the regulator.
ºº Isolator – close, open
ºº Left side – close, purge, open
ºº Flow check
When first learning this drill, take your time as correctness matters more than speed. At the Recreational/
Fundamentals level you should strive to accomplish this drill in under three minutes. A Tech 1/Cave 1 diver
should aim for two minutes while a skilled Tech 2/Cave 2 diver should have no issue with completing this
drill in a minute or less. The importance of dry land training cannot be stressed enough when learning these
drills. A few moments spent in the garage or on a picnic table practicing and visualizing the process will be
time wisely invested to maximize the use of your in-water time.
Valve Drill (Single)
This drill is used to confirm that the single tank diver has the dexterity to manipulate the valve in the event of
inadvertent closure. As the single tank diver only has one possible air source, it is absolutely critical that at no
time does the diver completely close the valve. This drill is used to confirm valve position as well as exercise
the ability to accurately locate and rotate the valve to the open position.
The drill is conducted as follows:
1. The team assumes a formation as dictated by the environment
2.
3.
4.
The diver who is currently conducting the valve drill will signal to one of his/her partners to observe
him/her while he executes the drill
The partner will assume a ready state (be prepared to donate) and indicate OK
The working diver will:
ºº Reach up with his right hand and locate the valve
ºº Demonstrate the ability to manipulate the valve (flow check the valve, do not close)
ºº Conduct a flow check
There is no particular time requirement for conducting this drill but given the possibility that in this scenario
a diver is in the unenviable position of being in the water with their only supply of gas shut down, it is in the
best interests of the diver to be able to execute this operation as efficiently and quickly as possible.
As mentioned previously these drills are designed to serve a number of purposes. Primary among these is to
ensure that the diver can in fact manipulate the valves in the first place. Next the drill serves more of a housekeeping and team-building role, that is that it exercises team and individual skill to execute the drill properly.
The housekeeping purpose is one of ensuring that everything is as it should be. Finally, but by no means least,
we wish to lay down the procedures and ingrain muscle memory so that when trouble occurs initial responses
are correct and immediate. It cannot be stressed enough that gas emergencies, while rare, are extremely serious and must be dealt with accordingly.
While on the surface valve failures may appear to present complex problems given the number of potential
failures, this process can be simplified tremendously by following simple procedures. The diver has to understand that there is time to solve these issues, although the time is limited, and while the problem might not be
found immediately it will be found eventually. Even if the diver does not find the problem at all, if the valve
drill has been executed properly and gas management rules have been properly adhered to, then there will still
be plenty of gas to get to safety!
Valve manual | 9
General Trouble-shooting Procedure
The following process should be used to solve loss of gas issues. With experience, immediate problem solving
actions may be executed for an in-process incident, however at this stage methodical problem solving is the
best practice. For the most part it is unlikely that the problem will be sufficiently clear to take precise actions.
This general procedure will at the very least isolate the problem, it is up to the team members to diagnose and
fix the problem, if indeed the problem is fixable.
Upon discovery of a loss of gas problem:
1. Signal your team and attempt to determine where the leak is occurring
2.
3.
4.
Close that valve
Purge and/or breath dry, switch regulators, and clean up if required
STOP and LISTEN
5. If the bubbles have stopped then the problem has been isolated to a failed or loose regulator; commu-
nicate to your teammate to come and investigate, while continuing to maintain situational awareness.
6.
If the bubbles have not stopped, then they are not going to at this point so it is time to move into gas
preservation mode; isolate and ask your teammate for assistance1.
Partner (Team) Response:
1. Form up on the distressed diver as dictated by the environment and be prepared to donate; continue to
maintain situational awareness.
2.
3.
4.
Observe the diver as they attempt to isolate the issue. In reality, if you are paying attention, you will
likely know exactly what the issue is by the time they ask for help, thus speeding up the process.
When you are motioned to come in and help solve the problem, make sure you identify the regulator
that the diver is breathing by tracing it’s hose back to the manifold.
Confirm the position of the isolator and the valve on the side the diver is not breathing from.
5. Begin the troubleshooting process.
It is imperative that the diver who is troubleshooting not manipulate the valve the distressed diver is breathing
from as can be illustrated as follows:
For arguments sake imagine that a failure on the left side has occurred. The diver in question executes the
correct procedure and is left in an end state of right valve closed, isolator closed, left valve open, and breathing from the left regulator that is leaking at the DIN wheel. The partner comes in and forgets to identify the
regulator the distressed diver is breathing from, sees immediately that the left regulator DIN wheel is leaking
and commences to shut it down-much to the surprise of his buddy who suddenly has nothing to breath from!
Once again this would do nothing to improve team trust.
We will now continue with a complete description of failures and the individual/team actions needed to carry
out corrective action.
1 At this point all available options have been exhausted. Even in the event of an error, and the problem is actually on the left
side, half of the gas supply is secured. The team member will discover the problem and safely execute the procedure to reestablish use of the primary and then proceed to rectify the real issue if possible.
Detailed Action for Failures
Right regulator repairable
None
Likely problem
Right regulator not repairable
• Unseated first stage O-ring
• A loose hose
Your Action
• Signal your partner and close the right valve
• Breathe or purge the long hose dry
• Switch to your alternate regulator
• Clip off the primary regulator
• If there are no bubbles the problem is temporarily solved
Partner Action
• Identifies which regulator you are breathing from
• Opens right valve slowly
• Checks for bubbles
• If there are bubbles
ºº Closes the right valve
ºº Purges the long hose
ºº Re-seats the first stage or tightens a loose
hose
ºº Re-pressurizes the right regulator
• If there are no bubbles:
ºº Purges the primary regulator in a manner
in which your partner can see it
ºº Signals that the regulator is OK
Your Action
• Switch back to primary regulator
• Flow check
Decision
• Check remaining gas supply
• Continue or terminate the dive
Lost Resources
Likely problem
• Blown o-ring
• Blown hose
Your action
• Clip off the primary regulator
Partner Action
• Opens the right valve slowly
• Confirms it is not repairable
• Shuts down the right valve
• Taps you on right shoulder or arm and indicate
that it broken
Your action
• Flow check
Decision
• Terminate the dive
Lost resources
• Primary regulator
• Primary inflation
Right side manifold not repairable
Likely problem
• Burst disk
• Tank O-ring
• Barrel O-ring
Valve manual | 11
• Valve failure
Your action
• Listen for bubbles to stop
• Clip off primary
• Still bubbling:
ºº Close isolator
• Purge the alternate regulator
Partner Action
• Confirms which regulator you are breathing
from
• Opens the left valve slowly
• If bubbles are still present:
ºº Turn the left valve off
• Bubbles will still be present so call in your partner to investigate
ºº Purge the alternate regulator
ºº Re-seat first stage or tighten a loose hose
Partner action
• Confirms the regulator that you are breathing
from
• Checks to ensure isolator has been completely
closed
• Confirms broken/not repairable
• Taps you on the right shoulder or arm and signals that it is broken
Your action
• Flow check
Decision
Lost resources:
• Primary regulator
• Primary inflation
Note: If this failure occurs the right side will bubble
until all gas is expended from the RH cylinder.
Left regulator repairable
Likely problem
• Unseated first stage O-ring
• A loose hose
Action
• Switch the light to a temporary hold
• Signal your partner and close the left valve
ºº Re-pressurize
• If no bubbles are present:
ºº Purges the alternate regulator
• Signal that the regulator is OK
Your action
• Flow check
Decision
• Check gas supply
• Continue or terminate the dive
Lost Resources
None
Left regulator not repairable
Likely problem
• Blown o-ring
• Blown hose
Your Action
• Switch light to a temporary hold
Partner Action
from
• Checks to ensure that you have completely closed
the isolator
• Taps you on the left shoulder or arm and signals
that it is broken
• Opens the left valve slowly
• Confirms it is not repairable
• Closes the left valve
• Confirms that it is broken/not repairable
Your action
• Flow check
• Taps you on left shoulder or arm and indicates
that it broken
Decision
• Flow check
Lost resources
Your action
Decision
Lost resources
• Alternate regulator
• Dry suit inflator
• SPG
• Alternate regulator
Note: The left side will continue to bubble until gas
has been expended from the LH cylinder.
• SPG
Erroneous right-side manifold
• Dry suit inflator
Left side manifold not repairable
Likely problem
Failure is on the left
Your Action
• Burst disk
• Barrel O-ring
• Switch to the alternate regulator
• Tank O-ring
• Valve failure
Your Action
• Purge the alternate
ºº Close isolator
• Bubbles will still be present so call in partner to
investigate
Partner Action
from
• Clip off primary
ºº Close isolator
• There will still be bubbles present so call in
your partner to investigate
Partner Action
from
the isolator
• Confirms that it is a left side failure
• Opens the right valve
Valve manual | 13
• Unclips and purges the primary and signals you
to switch regulators
Your action
Switch back to the primary
Partner action
• If the failure is the left regulator
ºº Closes the left valve (bubbles will stop)
and repairs if possible. [If it is repairable
then do so and complete the drill as per
a left regulator repairable drill. If it is not
repairable then leave the left valve in the
closed position and continue on with the
remainder of this drill]
ºº Opens the isolator
ºº Taps you on the left shoulder or arm to
indicate a non repairable alternate regulator failure
• If the failure is the left side of the manifold
ºº Taps you on the left shoulder or arm to
indicate a non repairable manifold failure
Your action
• Flow check
Decision
Lost resources
• Depends upon whether the failure is fixable or
not
Erroneous left-side manifold
Failure is on the right
Your Action
• There will still be bubbles present so call in
your partner to investigate
Partner Action
from
the isolator
• Confirms that it is a right side failure
• Opens the left valve
• Purges alternate and signals and signals you you
to switch regulators
Your action
• Switch to alternate
• Clip off long hose
Partner action
• If the failure is the right regulator
ºº Closes right valve (bubbles will stop) and
repairs if possible. [If it is repairable then
do so and complete the drill as per right
regulator repairable. If it is not repairable
then leave the right valve in the closed
position and continue on with the remainder of this drill]
ºº Opens the isolator
ºº Taps you on the right shoulder or arm to
indicate a non-repairable primary regulator failure
• If the failure is the right valve/manifold
ºº Taps you on the right shoulder or arm to
indicate a non-repairable primary regulator failure (there will still be bubbles)
Your action
Decision
• Signal partner and close the left valve
ºº Still bubbling:
• Close isolator
• Flow check
Lost resources
• Depends on whether the failure is fixable or not
Note: Bubbles will continue until right tank is empty
No idea where the gas is coming from.
Your Action
Execute a right regulator repairable drill until the problem has been properly dealt with.
Miscellaneous valve procedures
As well as the drills listed previously there are a few
other routine procedures or awareness checks that
should be done on a regular basis during the conduct
of diving operations:
Flow Check
When to do a flow check:
• Pre-dive
• After “S” and Valve drills
• During a technical dive:
ºº Upon reaching the bottom during an
technical dive
ºº Approximately every five minutes
ºº Midway through the dive
• Anytime your valves or manifold contacts something solid
• Anytime that makes you feel comfortable
Roll-off Awareness
After passing off your primary or failure of your primary
Isolator Awareness
Pressure gauge not registering a decrease as gas is being
consumed.
Afterword
While this document contains a fairly complete description of all the possible manifold failures and the methods
involved in solving them it is by no means a complete
reference as to everything that could go wrong. Flexibility and careful thought should be the order of the
day when attempting to discern manifold issues. As
with any endeavour—practice makes perfect.
Valve manual | 15
Annex A - Manifold Parts Lists
1
Burst Disk Assembly
Burst disk cap nut
Burst disk
Washer
Valve Body
Spring retaining nut
4
Spring
Handwheel
15
14
13
8
6
5
7
12
10
9
11
Washer
Valve stem nut
2
Tank neck ‘O’ ring
Valve stem nut ‘O’ ring
Thick teflon bushing
Valve stem
Split bushing
3 Tube (snorkel)
Valve stem ‘O’ ring
Valve Seat
Figure 4.1: Exploded diagram of a Halcyon 300 Bar left valve assembly. Photo courtesy of Karim Hamza.
Description
Trident Part#
1. Burst Disk Assembly consistiong of
• Burst disk cap nut
Description
Trident Part#
8. Valve stem . . . . . . . . . . . . . . . . . . . . . . . AA96-E
9. Thick teflon bushing . . . . . . . . . . . . . . . AA96-A
• Burst disk(Halcyon part#) . . . . . . . 64.000.015
10. Valve stem nut ‘O’ ring . . . . . . . . . . . . . . . . R014
• Single piece 300 bar(not shown) . . . . . AA-62
12. Washer . . . . . . . . . . . . . . . . . . . . . . . . . . AA96-K
• Washer
2. Tank neck ‘O’ ring . . . . . . . . . . . . . . . . . . . . R214
3. Tube (snorkel)
11. Valve stem nut . . . . . . . . . . . . . . . . . . . . AA96-C
13. Handwheel(Rubber Generic) . . . . . . . . . . . AA85
14. Spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A152
4. Valve Body
15. Spring retaining nut . . . . . . . . . . . . . . . . . . . A151
6. Valve Stem ‘O’ ring . . . . . . . . . . . . . . . . . . . R010
17.Isolator locking nuts
5. Valve Seat . . . . . . . . . . . . . . . . . . . . . . . AA96-D
7.Split bushing(Halcyon part#) . . . . . 64-000-003
16. Isolator barrel ‘O’ rings . . . . . . . . . . . . . . . . R012
18. Halcyon manifold rebuild kit . . . . . . .64.010.020
Spring retaining nut
15
Handwheel
Valve stem nut
Thick teflon bushing
Split bushing
Valve Seat
16
Isolator barrel ‘O’ Rings
14
Spring
12
Washer
10
Valve stem nut ‘O’ ring
13
11
9
8
Valve stem
6
Valve stem ‘O’ ring
7
5
4
Isolator locking nut
17
Isolator Body
Figure 4.2: Exploded diagram of a Halcyon 300 Bar isloator assembly. Photo courtesy of Karim Hamza.
While most manifolds use interchangeable parts, be cautious and ensure that you are using the correct part
for the job at hand as recommended by the manufacturer. Given the enormous energy that a SCUBA cylinder
contains, inviting catastrophic failure though carelessness should not be considered. A few divergent features
of the Halcyon manifold pictured in this document should be noted.
Some manifolds use a burst disk that is integrated into the cap nut. In Figure 4.2, a Halcyon burst disk assembly is illustrated. The burst disk is a dimpled copper disk that is held in place by a vented cap nut. There are
two main benefits to a this separate arrangement:
1. Cost - the simple copper disk is less expensive to replace
2. Flexibility - the burst disk rated pressure can be varied by replacing the disk.1
The other major divergence is the construction of the valve stem. The Halcyon valve stem has an integrated
shoulder that protects the valve stem O-ring buy placing the split bushing (part 7) and then the O-ring(part
6) itself in the groove behind the head of the valve stem. This protects this very critical O-ring from undue
wear and tear. There are an number of valve stems on the market that do not incorporate this feature. For those
units the split bushing is not required. Simply slip the valve stem O-ring (part 6) followed by the thick Teflon
bushing(part 9) on to the shaft of the valve stem.
1 It is essential that you replace a blown burst disk with one with the correct rating for the pressure vessel for which it is being
used. Failure to do so can result in injury or death!
Valve manual | 17
Gue Valve Manual
Global Underwater Explorers, 15 South Main Street, High Springs, FL 32643, USA, (386) 454-0820, [email protected]

GUE Valve Manual

Transcription

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