Motorsport Plumbing Systems: Push- Lock Hose Ends
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Push- Lock Hose Ends
02.51
| 00:00 | Push on hose fittings are common all over factory spec vehicles, where rubber hoses are pushed over hose barbs and often secured with hose clamps. |
| 00:09 | While not being the most secure fitting type and not suitable for high pressure applications, this is still usable for a range of plumbing systems like coolant, ventilation and vacuum lines. |
| 00:21 | This style of connection is quick and easy to use and can still provide good security with suitable hose clamps. Hose end fittings have been developed to make use of this kind of attachment, allowing us to easily join hoses to other threaded fittings. |
| 00:36 | This Essentially makes an adapter, from push on to AN for example, with a swivel in between to prevent the hose from rotating when the threads are done up. |
| 00:45 | This is more commonly called a push lock hose end and uses an interference fit where the outer diameter of the barb is slightly bigger than the inner diameter of the hose. |
| 00:55 | The rubber will expand over the barb and due to its elasticity, the resulting compression provides a friction force holding the hose onto the barb and creating a seal. |
| 01:06 | The barb has raised sections to concentrate pressure and increase the friction without making the hose too difficult to slide on or risk damaging from excessive stretching. |
| 01:17 | While a conventional push on hose fitting might only have a single barb, push lock hose ends almost always have two barbs. |
| 01:25 | As you might have guessed, these are not suitable for PTFE lines since the inner tube is not elastic and will permanently deform and be damaged if forced onto the barb or simply not seal. |
| 01:37 | The limitation with push on or push lock fittings is they don't have a feature to prevent over braids from unravelling. |
| 01:44 | With a conventional push on fitting, a hose finisher, which is an aluminium part designed to look like the socket from a reusable hose end but with an integral worm gear hose clamp, can be used to clamp down on the edge of the hose and secure the over braid, preventing it from unravelling. |
| 02:02 | Naturally, this would replace the need for a hose clamp and can also be useful for the same purpose on protective sleeving to prevent damaging the edges, although not typically used with push lock hose ends. |
| 02:14 | For these, there are flexible hoses available, where the integral braid is covered by a smooth outer layer. |
| 02:21 | This is commonly referred to as a push lock hose for this reason. |
| 02:25 | In summary, push on or push lock fittings are essentially an adapter providing an easy way to attach a rubber hose to a threaded fitting. |
| 02:34 | While these aren't suitable for PTFE hose, they can work with over braid if a part like a hose finisher is used to prevent the edge from unravelling. |
| 02:44 | A hose finisher or hose clamp is required for a secure connection. |
