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Special hydraulic fitting, need help.

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Special hydraulic fitting, need help.

Unread postAuthor: matti » Tue Sep 30, 2014 4:15 am

I tought I should ask help from here because many of us know very much about pipe fittings.. For some reason :D

So.. I need help for finding a quite special fitting if there is even one made.. Here is what I need:

- hydraulic fitting (rated for 250bar or more)
- thread size 3/4" or 1".
- one inlet and one outlet aka. "inline type", both with threads
- metal construction
- the fitting needs to expand linearly minimun of 50mm, so a somekind of sliding fitting.. :roll:

They make lot of different rotating fittings/couplers, but I would need a sliding one, not rotating.

I get that I could machine one with lathe, but I would hope to find one ready to use.

Have any of you seen fittings like this ? Even for pneumatic use ?
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Re: Special hydraulic fitting, need help.

Unread postAuthor: jrrdw » Tue Sep 30, 2014 8:57 am

Just for the hell of it I did some keyword searches and only came up with one or the other. I think you're going to have to build it yourself..
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Re: Special hydraulic fitting, need help.

Unread postAuthor: Technician1002 » Tue Sep 30, 2014 10:21 am

A hydraulic fitting that expands is called a hydraulic cylinder. At those pressures, it will expand under hydraulic force which is why it does not exist. A combination of either hoses or rotary swivel joints that does not change volumetric size in operation is required to be a fitting and not an actuator.
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Re: Special hydraulic fitting, need help.

Unread postAuthor: matti » Tue Sep 30, 2014 10:50 am

Technician1002 wrote:A hydraulic fitting that expands is called a hydraulic cylinder. At those pressures, it will expand under hydraulic force which is why it does not exist. A combination of either hoses or rotary swivel joints that does not change volumetric size in operation is required to be a fitting and not an actuator.


Well.. Thats true :lol: what if It would be a balanced system, we use balanced valves sometimes with spudguns where area and pressure are same both sides of the valve, so could this be applied to this sliding "fitting".. Actually the fitting or the fitting body dont need to expand or move, but the outlet port on the fitting should be able to move linearly.. Not sure if that makes any sense, Im making food and typing reply with my phone so I dont have my mind fully in this right now :D
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Re: Special hydraulic fitting, need help.

Unread postAuthor: Technician1002 » Tue Sep 30, 2014 2:52 pm

A slip repair coupling, but the middle replaced with a T and then made of metal for hydraulic pressure should work in making the sliding section balanced. The T would need to be long enough to keep the port covered it's full length of travel.
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