Plastic Lip Seal

[shmoey212]

Hey! I am fairly unfamiliar with watertight/waterproof dynamic seals and I was looking for some guidance on a project. My current design uses two tubes - 1 stationary and 1 that rotates approx. 90 degrees (back and forth) - and I need to create a low cost, low friction seal between the two parts. There's very little pressure on the seal as the flow of water is quite minimal.

At the moment, my design has a tube (stationary) with a 50 mm diameter. The rotating tube has a 44 mm diameter and rubber gasket that extends to 54 mm diameter. the rotating tube is pressed inside the stationary tube and the rubber gasket makes for a decent but not great dynamic seal. I was hoping to use a design similar to the polypropylene lip seals on the inside of a disposable water bottle. Let me know if you have any suggestions. Thanks!!

 

[TimSchrader2]

Hello

Option 1 for low cost: O rings can be used for dynamic sealing. Download a "parker O ring" catalog and there is a section on dynamic oring and what pressure they can handle. It will also give the dimensions to use in the grooves. But your inner tube may or probally is not be thick enough to get a groove in it. And they would need to be restrained somehow.


Option 2 Research some more. Lip seals are good. The ploypak seals in hydraulic cylinders go to 3000 psi. Over kill for your application. But there may be a lower cost version that will work.

 

[hydtools]

Maybe a v-ring seal.

http://www.sealanddesign.com/page/v-ring-seals

Ted

 

[Hidromar]

Hi!

Some important information is missing: speed

If looking for high speed, plastic seals are OK, otherwise, rubber O-Ring is the low-priced seal for you. Counterface is also important, so (as son as I understand) is a plastic material, but (some) plastic, working against plastic tends to damage

Another point is about how many 90º/turns are made by minute. As more continously do the work, more care should be taken on materials in regards of life expectancy

http://www.hidromar.es

 

[MintJulep]

Take your kitchen sink faucet apart.

Your description pretty much matches one.

 

[Tmoose]

pictures, drawings, tube materials ?