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Thread: TEV boot

  1. #1
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    TEV boot



    Not familiar with why you would put a rubber boot on an expansion valve. Seen a few of them mainly on Carrier units, not tightly fitted and is open at the top. I would have though it would cause problems with trapping moisture. Anyone know what there for?

    Thanks

    IMG_0295.jpg



  2. #2
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    Re: TEV boot

    Probably trying to keep the head warmer than the bulb do that the charge does not migrate to the head.

  3. #3
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    Re: TEV boot

    Hi Sean
    sometimes it is necessary to cover the stainless steel capillary tube to try to prevent corrosion caused by chlorine. This can be necessary in certain enviroments such as swimming pools , where fish are stored (sea water) etc . I have seen a number of these T2 valve which have lost the charge due what is termed as deep crevice corrosion.
    What product is stored close to the valve .?.
    The blackening of the brass body is indicative of an aggressive enviroment

  4. #4
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    Re: TEV boot

    Hi FaultCode,

    Its open at the top so the top of the head is visible.

    Thanks

  5. #5
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    Re: TEV boot

    Brilliant answer Glenn.
    You learn something new every day.
    Grizzly
    Despite the High Cost of Living it still remains Popular!

  6. #6
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    Re: TEV boot

    Hi Glenn,

    As far as I know its just a standard Carrier unit on a box van for moving meat products, it may be that they use a cleaning product for the back of the van. The only reason I could think of was to try and protect against corrosion at the joint on the diaphragm, but the boot is open at the top and I would have thought moisture would be more likely to collect and then get between the boot and the diaphragm and cause more of a problem. The boot has a bit of height so could create a pocket of stagnant air.

    Thanks
    Last edited by seanf; 20-05-2017 at 11:05 AM.

  7. #7
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    Re: TEV boot

    Maybe its to stop the capillary vibrating and rubbing through, i usually put two or three small cable ties on the loop of capillary to stop unwanted movement.
    Mostly found in Oxfordshire, UK :)

  8. #8
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    Re: TEV boot

    Quote Originally Posted by monkey spanners View Post
    Maybe its to stop the capillary vibrating and rubbing through, i usually put two or three small cable ties on the loop of capillary to stop unwanted movement.
    Think youve probably got it monkey spanners.

    IMG_0299.jpg
    Maybe a better image than the first. It does look like the capillary is held by the boot, but I would have thought it would be better to prevent moisture being trapped and just use cable ties.

    Thanks
    Attached Images Attached Images
    Last edited by seanf; 20-05-2017 at 03:01 PM.

  9. #9
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    Re: TEV boot

    I think it's to stop vibration,it's always like that on carrier road units

  10. #10
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    Re: TEV boot

    Hi Sean
    It is certainly an overkill but there again being banged around on our potholed roads and vibrations from a Diesel engine perhaps they deem it necessary to prevent capillary tube damage, it's certainly a neat idea, looks a bit like shrink tubing. But as you quite rightly say it would be better to keep the capillary tube in a dry condition than to keep it submerged in some possibly aggressive fluid which will shorten its life cycle. I used to use cable ties the same as monkey spanners more for neatness than anti vibration but even using cable ties can contribute to corrosion failure under the right circumstances which I had on some trawlers up in your kneck of the woods. Most engineers assume that stainless steel will last for years inmany cases it does , but under certain environments it can be corroded as easily as mild steel unless precautions are taken.

  11. #11
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    Re: TEV boot

    Just to add, If you use cable ties only, capillary to power element could still bounce around breaking it, unless most of it was supported by securing it to something else.
    I guess it looks professional as well.

  12. #12
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    Re: TEV boot

    Carrier introduced them on xarious and 30 to stop capillary bouncing and vibrating on servicein when in warranty we where requested to spray with white grease to protect capillary lot of these vans where on fish and rotted them out

  13. #13
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    Re: TEV boot

    Transport units suffer from extreme vibration as said before in earlier posts I used to wrap them around the head and use insulating tape if you did not they would just not last,quite a weak spot with the danfoss valve,the stresses and strains on transport refrigeration is like drinking a pint on a bike with a buckled wheel !!!!

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