Hydraulic Connectors: Difference between revisions
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Tom Griffing (talk | contribs) (Created page with "Choosing connectors in high pressure hydraulic circuits is important for preventing leaks. *This was made clear in a recent in-person interview with a professional in the hydrau...") |
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Choosing connectors in high pressure hydraulic circuits is important for preventing leaks | == Choosing Threaded Connectors == | ||
==== Choosing connectors in high pressure hydraulic circuits is important for preventing leaks ==== | |||
*This was made clear in a recent in-person interview with a professional in the hydraulics industry. The claim was that in circuits with more than 200 PSI, connectors with "Parallel Threads" should be used instead of those with "Tapered" or "Pipe" threads. | *This was made clear in a recent in-person interview with a professional in the hydraulics industry. The claim was that in circuits with more than 200 PSI, connectors with "Parallel Threads" should be used instead of those with "Tapered" or "Pipe" threads. | ||
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*The key issue is that tapered threads do not seal completely and must employ a "sealant" to seal the threads completely. When fluid pressure is applied, the metal threads remain in place, but the sealant can give way and allow leaks to form. Leaks may not occur at first, but they will develop over time as the sealant weakens and as the connections experience movement and vibration. | *The key issue is that tapered threads do not seal completely and must employ a "sealant" to seal the threads completely. When fluid pressure is applied, the metal threads remain in place, but the sealant can give way and allow leaks to form. Leaks may not occur at first, but they will develop over time as the sealant weakens and as the connections experience movement and vibration. | ||
* | ==== Tapered vs Parallel Threading ==== | ||
* | |||
*Designations for tapered pipe threads are: | |||
** '''NPT''' (National Pipe Taper) | |||
** '''BSPT''' (British Standard Pipe Thread) | |||
*Designations for connections with parallel threads: | |||
** '''BSPP''' (British Standard Pipe, Parallel) | |||
** '''UN/UNF''' (or "SAE Straight Threads") | |||
** '''Metric''' | |||
==== Summary ==== | |||
In summary, parallel threads are preferred for OSE hydraulic applications, since they reduce the potential of leaking. | |||
==== Reference ==== | |||
*Here is a document from Parker Hydraulics explaining the details: | |||
::[http://mdmetric.com/4300/Pipe%20Fittings%20and%20Port%20Adapters.pdf| Pipes Fittings] | ::[http://mdmetric.com/4300/Pipe%20Fittings%20and%20Port%20Adapters.pdf| Pipes Fittings] | ||
Revision as of 15:53, 27 November 2011
Choosing Threaded Connectors
Choosing connectors in high pressure hydraulic circuits is important for preventing leaks
- This was made clear in a recent in-person interview with a professional in the hydraulics industry. The claim was that in circuits with more than 200 PSI, connectors with "Parallel Threads" should be used instead of those with "Tapered" or "Pipe" threads.
- The key issue is that tapered threads do not seal completely and must employ a "sealant" to seal the threads completely. When fluid pressure is applied, the metal threads remain in place, but the sealant can give way and allow leaks to form. Leaks may not occur at first, but they will develop over time as the sealant weakens and as the connections experience movement and vibration.
Tapered vs Parallel Threading
- Designations for tapered pipe threads are:
- NPT (National Pipe Taper)
- BSPT (British Standard Pipe Thread)
- Designations for connections with parallel threads:
- BSPP (British Standard Pipe, Parallel)
- UN/UNF (or "SAE Straight Threads")
- Metric
Summary
In summary, parallel threads are preferred for OSE hydraulic applications, since they reduce the potential of leaking.
Reference
- Here is a document from Parker Hydraulics explaining the details: