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Thermal Insulation Of Hydraulic Cylinders

  1. Nov 15, 2012 #1
    Hi All,

    I'm working on a Hydraulic Tire Curing Press Project.There are Hydraulic cylinders in many regions of the press.Steam @ 220 deg c is used to heat the tire to bring about vulcanization process.The press earlier supplied to the customer had thermal insulation problems due to which the structure got heated and the heat was transferred to the cylinders (Which has been rectified in the present design) by which the seals of hydraulic cylinder failed frequently.The customer now demands thermal insulation for all hydraulic cylinders even though we have satisfactory insulation design.

    The question is readymade thermal insulation available for hydraulic cylinders? or has anyone read or heard of insulating the hydraulic cylinders?

    Note: I have done some searching in internet and i couldnt find any results.

    Sorry if I have mis-stated or understated something and thanks in advance for your support.
  2. jcsd
  3. Aug 3, 2013 #2
    Wouldn't want the hydraulics to be doing too much work or they would get hot by insulating them. Then again I guess you can cool the hydraulic oil.
  4. Aug 4, 2013 #3


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    Science Advisor

    Cylinder heating during operation should not be a problem as it is cooled by the cyclic fluid exchange. High pressure hydraulic fluid will be subjected to a pressure reduction in the cylinder cycle so that may even produce a net cooling effect.

    A thermal insulation layer would need to be a closed cell foam or it would progressively absorb water and oil.

    It might be possible to achieve sufficient cooling by mounting a thin stainless steel heat shield between the heat source and the cylinder. The free thermal movement of air in the small gap between the shield and cylinder will make a big difference to the cylinder wall and hence the piston ring temperatures.

    Alternatively, fit a tube jacket over the cylinder with a small annular gap. Then pump a water/glycol or cooled hydraulic fluid through the jacket to remove the heat from the cylinder wall. The cooling fluid seal between the jacket and cylinder ends could be with an O-ring as there is very little pressure involved.
  5. Aug 8, 2013 #4


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    Gold Member

    Too bad asbestos is such bad stuff--it would be perfect for this application otherwise! Have you looked into fiberglass insulation? I've seen jacketed fiberglass around pipes before.
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