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Effects of a smaller port on flow rate


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#1 MacWorld OFFLINE  

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Posted November 09, 2016 - 03:25 PM

I am planning on adding hydraulic circuits to my 1977 Massey Ferguson 1655 by using 6/2 valves. Here is what I know (tell me if I am wrong somewhere)

 

The hydro-static unit is a Sauer Danfoss 15. From the specs, the ports for the implements are 9/16-18 (SAE #6 if I am correct) and the flow specs are
3.50 GPM @ 200psi - 3300rpm
0.25 GPM @ 800psi - 3300rpm
 

The valves I am looking at are Bosch Rexroth L710 family of 6/2 valves, with SAE #4 ports. They advertise max 4500psi 6.6GPM.

 

Would those valves have any impact on the implements? I am mainly wondering since the implement ports of my pump are SAE #6. I don't remember if the tractor's tubes/hoses are 3/8" or 1/4", there is a 90° between the pump's ports and the hoses, they MAY be reducing the size. Why are the ports SAE #6 when it seems SAE #4 would be overkill?

 

I plan on keeping the original tubes/hoses between the pump and the main valves of the tractor, then run 1/4" tubes/hoses to the L710 valves and continue with 1/4" tubes/hoses from the L710's to the implements.

 

Thank you!



#2 KennyP ONLINE  

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Posted November 09, 2016 - 06:07 PM

I'd like to know the answer to that myself!


  • Bmerf and chieffan have said thanks

#3 stiemmy OFFLINE  

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Posted November 09, 2016 - 08:07 PM

X3

Maybe contact Bosch, see what they say.

Edited by stiemmy, November 09, 2016 - 08:09 PM.


#4 gopher OFFLINE  

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Posted November 09, 2016 - 08:48 PM

If your referring to dash numbers -6 would be 3/8 inch. Going to 1/4 would not have a lot of effect on cylinders. But if your talking trying to run something with a hydraulic motor your volume would drop almost half. Not sure if you can find something to run with 3.5 GPM. Not familiar with hydo-statics. So if I'm wrong some one more enlighten with these will chime in.     



#5 ducky OFFLINE  

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Posted November 09, 2016 - 08:57 PM

You will be OK with a 6.5 GPM valve as the flow of the charge pump is around 4-5 GPM.

I am curious as to how you are going to plumb it into the system if you keep all the original piping intact?



#6 MacWorld OFFLINE  

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Posted November 09, 2016 - 09:10 PM

I will only be keeping the piping between the pump and the tractor's valves (the ones with levers that I operate). I will be customising the rest from those valves to the 6/2 and then to the implements.

 

If I understand correctly the original SAE #6 ports were way too big for the pump's needs?



#7 ducky OFFLINE  

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Posted November 09, 2016 - 09:17 PM

Is it an open center valve?  If not it will not let flow back to tank when not in use.



#8 Alc OFFLINE  

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Posted November 10, 2016 - 06:39 AM

Maybe this will help with others with your question .

http://www.hydrover....lusso_VS120.pdf

  Ducky are you saying he should make sure the new control valve ( not the 6 port one ) will need to be " open center " ?



#9 MacWorld OFFLINE  

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Posted November 10, 2016 - 10:33 AM

Why would I need a open center? If I am using one implement I expect the other one to stand still.

 

i.e.: lets consider my 3points lift cylinder circuit: during winter the 3points will have my counterweight attached to it, once raised I will switch the L710 and I will be using the circuit for the snowblower chute orientation; I expect the counterweight to stay up!



#10 olcowhand ONLINE  

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Posted November 10, 2016 - 10:41 AM

Why would I need a open center? If I am using one implement I expect the other one to stand still.

i.e.: lets consider my 3points lift cylinder circuit: during winter the 3points will have my counterweight attached to it, once raised I will switch the L710 and I will be using the circuit for the snowblower chute orientation; I expect the counterweight to stay up!


It will, provided the cylinder piston seals are good.

#11 ducky OFFLINE  

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Posted November 19, 2016 - 08:01 PM

Maybe this will help with others with your question .

http://www.hydrover....lusso_VS120.pdf

  Ducky are you saying he should make sure the new control valve ( not the 6 port one ) will need to be " open center " ?

I misinterpreted the installation. I thought he was adding more spools.

I see now that he is just splitting one of the circuits.  That would not require an open center valve. It is just a diverter valve.






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