How to make hydraulic valve?

[Madda]

Jw., good job on the drawings!


One thing that I'm not really sure of is where and what seals are used?

[ihbuilder]

JW : steel or iron next to brass would be the best choice for your manifold . Aluminum does not wear well .


Madda : O-rings work well for the seals as you should only have to seal the shaft of the rotor and the rotor cap . between the rotor and the valve block , you should have a lapped fit .

[RCP57]

Originally Posted by ihbuilder

JW : steel or iron next to brass would be the best choice for your manifold . Aluminum does not wear well .


Madda : O-rings work well for the seals as you should only have to seal the shaft of the rotor and the rotor cap . between the rotor and the valve block , you should have a lapped fit .

I agree with Steve 100%. The valve that I made for my skidder is all aluminum with brass rotors but it may not last long. The valve block that my father in-law made for my EC300DL has a steel manifold and should last much longer. The shafts are sealed with common O rings on both. The EC300 runs at 30-35 bar with no leaks on the valve shafts.

[RCP57]

This is the only picture that I took of the Volvo's valve assembley. I believe the pistons in this are .550. In mine they are slightly larger at .610.

[ihbuilder]

even with the poor tolerances on the Robbie valves , they don't leak . The rotor just chews up the manifold . When I get back to running steel in the mill , I'll be making 2 , 1 for the loader and 1 for the TD40 .