Flareless,Flared & lip seal fitting

[paramathma]

Hi,

I am little confused in selecting a tube fitting type.
We have 2 different pressure applications. One is 1500 psi and the other is 3000 psi.our customer has asked us to decide on the fitting type.
Is there any design criteria in selecting the fitting end i.e. flared, flare less and Lip seal fitting?
From the net I found that all the three fitting types can be used for 3000 psi application.

Thanks

 

[BillPSU]

37 degree flare is the much used standard for the hydraulic industry. It can handle 3000 psi with no problem with good torquing practices. There are other approaches including o-ring face seal which is another newer but standard sealing system. There are several other proprietary systems such as the flare with an o-ring in the flare and several push to connect fittings. The 37 degree flare is the fitting of choice based on lowest cost.

Verify that there cannot be pressure spikes within the system caused by external loads being applied to an actuator. An example would be a loader pushing snow on a parking lot. The loader bucket hits a parking block or a curb causing a hydraulic pressure spike in the system. Those spikes can destroy a hydraulic system if not properly guarded with pressure relief valves in the circuit. Another issue would be utlizing acessories which can literally hammer a machine apart. One such an accessory is the hydraulic hammer used for breaking concrete on a loader.

 

[johnSchwaner]

If this is an aerospace application then beam-seal (Dynatube) fittings are replacing 37 degree for new applications because of their light weight. Suggest you contact Parker Stratoflex at (817) 738-6543. You might ask for Mr. Paul Quinn. or

http://www.stratoflex.com

Stratoflex is Parker's aerospace division.

 

[edmeister]

We have a requirement to re-machine the 37 degree flare on various fittings. Due to over-torquing the flare has now deformed into a concave shape. The fittings are inbedded (welded) into various devices that do not permit typical machining. We require some type of portable (max 1.5" Dia) tooling that would resurface the damaged flare back to its flat surface. Has anyone attemped this or aware of any tooling that would work?