[PSUBS-MAILIST] solenoid valves

Tue Apr 16 11:54:53 EDT 2019

 David,That looks like the ones I got.  I wasn't to worried about pressure rating because there is only a slight pressure difference from side to side on them in this application.Hank
    On Tuesday, April 16, 2019, 8:26:39 AM MDT, David Colombo via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Hi Hank, this one on amazon is rated at .8mpa. Is yours rated for more?
On Tue, Apr 16, 2019, 9:12 AM hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

David,I used cheap brass valves, Hank    On Tuesday, April 16, 2019, 8:02:20 AM MDT, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Yes, but I meant in salt water.
:)
On Tue, Apr 16, 2019 at 8:33 AM hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Alec, I am sure I have mentioned it before, but, I used solenoid valves on my log salvage ROV that dove 200 feet deep every 7 minutes for months on end.  Not one single failure.  Hank
    On Tuesday, April 16, 2019, 4:45:46 AM MDT, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Ah, I didn't realize that was on the other sub! Yes, you're right about the simplicity of electrical. But pneumatic tends to be MUCH less failure prone in my opinion. Bottom line, both work.
On Tue, Apr 16, 2019 at 5:19 AM hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Alec,The pneumatic valves are on E3000, so your memory is intact.  ;-)   I am experimenting with the solenoids mostly and you were correct about an air lock in the lines.  Now I have to decide if I want to enclose the electric valves or put pneumatic valves in.  Turns out I only need two.  The thing I don't like about the pneumatic valves is all the darn plumbing and regulating and valving.  Electric is so simple once a nice oil filled housing is built.Hank
    On Monday, April 15, 2019, 7:39:34 PM MDT, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Hi Hank,
Great the new valves work so well. I recall you posting photos of a new valve during the winter, but unless my memory is playing tricks on me (which it does) I recall a small pneumatic ram, not a solenoid. Did you change that or am I wrong?
Best,
Alec 
On Mon, Apr 15, 2019 at 4:36 PM hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hi All,When we were in Lake Tahoe, Alec asked if I get an air lock in my MBT vent lines.  I said no, but that got me thinking, and I may not have realized that I was getting a air lock.  Normally I dive Gamma heavy with no issues but  at Lake Tahoe I was diving very close to neutral.  The problem I was having at Lake Tahoe, was the sub leaning uncomfortable while submerging.  I blame that on the weight of the sub and since the sub was light it could not push the water out of the vent lines casing a blockage.  I like diving closer to neutral now so I installed 4 solenoid vent valves as an experiment.  It has solved the problem completely.  In fact I only need two valves to make it sink perfectly now.  With all four valves open plus the two original valves open, the sub dives in 1 min and 30 seconds.  Slow compared to Alec's sub but good for Gamma.
My next challenge is to install a bigger port in E3000.  First I am planning a proper poured concrete test pool in my new shop.  Then I will dive E3000 a couple million times in the pool.  Then I can work on a larger port assembly.Hank_______________________________________________
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