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Hi out there, I just purchased a sheerline akula that needs bit of tlc. The major problem is that if the dive pump is not running the sub will come to the surface. I have been informed that there is a valve operated by a servo that should close keeping the water in the dive tank, and then when the servo is powered the valve opens to allow the water out. Is this correct, and if so what’s the best way to adjust the valve. Thanks, Michael
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4 posters
The workings of a sheer line submarine
Michaelc- Posts : 32
Join date : 2021-04-22
salmon- AMS Forum Owner
- Posts : 312
Join date : 2011-09-02
Age : 64
Location : Las Vegas, Nevada - USA
Does your pinch valve look like this?
_________________
If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.
Michaelc- Posts : 32
Join date : 2021-04-22
Hi, yes it does. What do I need to do too check and adjust the valve. Michael
salmon- AMS Forum Owner
- Posts : 312
Join date : 2011-09-02
Age : 64
Location : Las Vegas, Nevada - USA
There are several thoughts.
1. is the hose being pinched old? Possibly has a crack or hole in it? I would recommend replacing it. Air getting past the pinch valve (if it is working) suggests air is getting in maybe somewhere else (or under the point of compression on the hose).
2. the pinching of the hose is a simple task, is the hunger pushing the hose closed completely? Maybe see if you can suck or blow air through the hose?
3. If not, make or get the servo horn larger to push the plunger down more on the hose or move the valve closer to the servo.
4. Is the servo still strong enough to maintain the pressure to keep the hose closed.
Hope this helps.
Peace,
Tom
1. is the hose being pinched old? Possibly has a crack or hole in it? I would recommend replacing it. Air getting past the pinch valve (if it is working) suggests air is getting in maybe somewhere else (or under the point of compression on the hose).
2. the pinching of the hose is a simple task, is the hunger pushing the hose closed completely? Maybe see if you can suck or blow air through the hose?
3. If not, make or get the servo horn larger to push the plunger down more on the hose or move the valve closer to the servo.
4. Is the servo still strong enough to maintain the pressure to keep the hose closed.
Hope this helps.
Peace,
Tom
_________________
If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.
david f likes this post
Michaelc- Posts : 32
Join date : 2021-04-22
Thanks. I will have a look tomorrow
salmon- AMS Forum Owner
- Posts : 312
Join date : 2011-09-02
Age : 64
Location : Las Vegas, Nevada - USA
Any success on finding the issue?
_________________
If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.
Michaelc- Posts : 32
Join date : 2021-04-22
Hi, I think I have sorted the problem. It looked like the servo setting for the pinch switch was wrong. The WTC is still apart, so I have not tested it in the water yet, but it looks ok now. Thanks for showing interest.
david f likes this post
Robbert de Rouw- Posts : 1
Join date : 2021-01-29
If you need any information or parts, contact Matthew Beck, he took over Sheerline and produces parts for thes subs.
subkraft- Guest
- Posts : 3
Join date : 2012-06-18
Hello.
I'm a bit new here but thought I'd chip in and offer something for what it is worth.
The pinch valve is necessary in your system, but can be replaced with a 6 or 12 volt solenoid switched valve.
Something like this:
https://www.ebay.com.au/itm/233929819852?hash=item36774dc6cc:g:AtUAAOSwigZgTaQN
No mechanical problems with servo strength or tube conditions etc with a solenoid valve.
Just has to be electrically switched on or off from the tx, with the pump.
Just a suggestion, others here may have others.
Regards
I'm a bit new here but thought I'd chip in and offer something for what it is worth.
The pinch valve is necessary in your system, but can be replaced with a 6 or 12 volt solenoid switched valve.
Something like this:
https://www.ebay.com.au/itm/233929819852?hash=item36774dc6cc:g:AtUAAOSwigZgTaQN
No mechanical problems with servo strength or tube conditions etc with a solenoid valve.
Just has to be electrically switched on or off from the tx, with the pump.
Just a suggestion, others here may have others.
Regards
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