Question about Sherwood SR1 Regulator

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I have a sherwood magnum 2en stage that is free flowing i have replaced the diaphram, when I put air to it the free flow was comine from the arm that the diaphram releases to allow the air to flow. What do I need to do to correct this problem? (my biggest problem is I am in progresso Mexico Dive shops are hard to find and the few that are here have no ideal or parts to fix one.) Thank you, Dr. Sandy Tomaselli.

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Check your down stream valve in your first stage. this may be stuck or the spring may be out.

Posted on Jun 16, 2009


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Free flowing regulator

If free flow from the moment the unit is pressurized it could be the 1st stage intermediate pressure (IP) is too high or the second stage valve seat is missing, set screw is too loose, seat is damaged or has debris on it. If the free flow gradually increases under pressure it usually indicates a damaged 1st stage valve seat. A trained Mares Tech with the correct tools and genuine parts would be the best solution.

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The regulator is free flowing the opupus is also free flowing . They are Magnum blizzard by sherwood

Your regulator requires servicing as this problem could be caused by either excessive pressure in the LP line to your Reg or the valve in the reg has become defective.

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The petcock has a safety in it that only allows fuel to flow when there is vaccuum applied to it. There is a second hose beside fuel hose that goes to diaphram in petcock. If the hose collapses or the diaphram ruptures then fuel wont flow. If you pull the hose off the back of the diaphram and see fuel then the diaphram is definitely shot. When you take the tank off fuel shouldn't flow. If you apply vaccuum to the port on the back of the petcock it should begin to flow. If not then petcock is bad. If it does check hose from engine to petcock.

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I have an unmarked first stage reg. thats leaking air through the back side through the two small holes

Depending on the model, some regulators (such as Sherwood) always leak a very small stream of fine bubbles as part of the depth compensating mechanism. By this, the regulator adjusts the air flow from the first stage to compensate for increased depth.

As a regulator technician, I would have to see the first stage to make any educated comment or recommendation.

Feb 20, 2010 | Dacor Scuba Diving & Snorkeling

1 Answer

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The flow packs are not opening properly. There may a restriction in the lines feeding the flow packs or the springs/ diaphrams may be bad. I suggest replacing both flow packs and making sure all lines feeding flow packs are free of oxidized iron and debris.

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Hi. I would suggest having the internal o-rings checked. One of them could be worn, allowing the air to escape. Or put it into your local dive shop for a service.

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1 Answer

Mares Abyss Octo, brand new, not breathing well

It's possible that the perceived free flow problem is causing a more general lack of faith with the reg?
A correctly set up reg will never be too far away from free flowing in that transition from air to water - just as you dive in. This is not uncommon and shouldn't necessarily be determined to be a fault. Some manufacturers have gotten around this issue by allowing the user to switch the 2nd stage to a less sensitive setting (small knob on side 'pre-drive' & 'dive'). This means the reg can still be set up correctly but effectively put into an incorrect (for diving) mode while you are bobbing around on the surface getting ready to go down.
The fact that the abyss doesn't have this mode doesn't mean it isn't working right. If your shop adjust the sensitivity too far, they are going to make it harder to breath with. I have a couple of Abyss and sometimes experience small free flow. Nothing to worry about. You can look it up but the reg has been down to some record breaking depths without issue.
You haven't said which is your main reg - but the poseidon system runs a much higher pressure between 1st and second stage. You absolutely should not use this octo with poseidon, unless it has been ok'd by a authorized poseidon dealership.
In summary I can't see that your two problems are linked.

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1 Answer

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The front of the regulator should twist off with a little effort then exposing the purge diaphram, check your dry cracking and deteireation, you shoud be able to dismantle the reg and assmeble easily, and when you do get it open lube the piston and diaphram with silicone grease, but not the side you breath from just the mechnical side.

Jan 31, 2009 | Sherwood SR1 Regulator

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