Trying to understand hydraulic fitting/ID size?

jfharper

Member
I'm doing some conversions on my power steering system and was curious about some things.

If the pressure port out of my power steering pump is a 1/4" NPT port, that would mean the ID of this port is 1/4." Then a 3/8" tube/hose assembly attaches to this port's fitting and goes into my steering control valve.

The control valve pressure inlet port is -06 oring straight thread, so according to the -06 fitting, the OD is 3/8", making the ID somewhat smaller than 3/8 due to tube wall size, but larger than 1/4.

So my question is, since the port on my pump is 1/4" ID, I should be safe in going no smaller than -06 or 3/8" tubes and fittings on the rest of my system...correct? I just wanted to make sure my system didn't need -06 or -08 somewhere, like at the steering control valve pressure inlet for pressure/flow purposes, because if the pump pressure port is 1/4" than that right there is the flow limiting link in the chain...right?

Does that make sense?
 
confused?

Does the system work ok now?

What are you trying to accomplish by the conversion?

Are you trying to tap into the Power Steering for something else?

Absolutely don't go smaller and try to keep the rubber hose to a minum. Where you do yse rubber hose use the higher rated double braded stuff.

Hose expands under pressure and longer runs with lower pressuer hyd hose could make the system respond slower - turn the wheel and wait for the tires to turn. smaller diamater tube can also cause this.

Looks like you have a number of different fittings - a good cross reference chart will be helpful
 

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