Why is this hard? Hydraulic sizing frustration

[oldnslo]

Series valves: The flow comes in port "P" of the manifold, through the valve from "P" to "T", then into "P" of the next valve out "T' of this valve etc. At 100 + PSI per valve this adds 200 + PSI loss which is pure heat generation. No you will not go over the relief valve.

I just looked at my Vickers & Rexroth catalogs and their D03 with tandem center spool is rated to 12 GPM max pressure drop from "P" to "T" in the spring center condition at 10 GPM appears to approximately 60 - 70 PSI. NOTE: This is just the valve and does not include any losses in the subplate, plumbing etc.

If you rarely run over half - 3/4 throttle the D03 would be fine. Higher RPM's I would be concerned.

 

[Leejohn]

You mean the knob or the lever in the first photo? The knob is a variable valve and speeds up or slows down how fast the 3PT works and the lever is the HST L-N-M-N-H shifter that one mussent touch when moving.

No in picture 4.

 

[MinnesotaEric]

Series valves: The flow comes in port "P" of the manifold, through the valve from "P" to "T", then into "P" of the next valve out "T' of this valve etc. At 100 + PSI per valve this adds 200 + PSI loss which is pure heat generation. No you will not go over the relief valve.

I just looked at my Vickers & Rexroth catalogs and their D03 with tandem center spool is rated to 12 GPM max pressure drop from "P" to "T" in the spring center condition at 10 GPM appears to approximately 60 - 70 PSI. NOTE: This is just the valve and does not include any losses in the subplate, plumbing etc.

If you rarely run over half - 3/4 throttle the D03 would be fine. Higher RPM's I would be concerned.

Wow. Sounds like D03 is out simply because I anticipate rolling from point to point at wide open throttle and my brush bull will require wide open throttle. From what you've shared, it sounds like I really do need to look at D05 or give up and get a diverter valve up front on the loader. Can you suggest a valve and a sub plate?

 

[MinnesotaEric]

No in picture 4.

The shepherd's hook looking thing? That isn't a lever, that is at the tank breather with a loop to prevent rain from getting in. It does look like something you'd pull but it you take a second look it is held on with a hose clamp and although painted, it is made out of a soft, rubbery material.

 

[oldnslo]

Wow. Sounds like D03 is out simply because I anticipate rolling from point to point at wide open throttle and my brush bull will require wide open throttle. From what you've shared, it sounds like I really do need to look at D05 or give up and get a diverter valve up front on the loader. Can you suggest a valve and a sub plate?

Eric,
What is the ultimate intended use(s)for the added valve(s)?
If you just want to run a grapple the diverter would be the simplest method.
If you want to run multiple functions then adding valves may be the better option.

For open center (series) circuits it is hard to beat cast iron mobile valves Vs industrial D03 / D05 style valves since mobile valves use a parallel circuit they are typically very low pressure drop. You can get both in either electrical or manual operation so it is just a matter of determining what you want to do with these extra functions.

For industrial D03 / D05 size valves I would consider Eaton-Vickers, Parker, Rexroth, Dynex-Rivett and good name brands. Northman is usually not a close quality match to any of these. Nachi lands somewhere between , Northman and the name brands. Industrial advantage is spool selection and potential for stack modules for function control. Example of stack functions are; cross-over reliefs, flow controls, reducing valves, check valves, etc..

Mobil valves: Most common are Prince, Brand, Husco, Sauer Danfoss with Husco & Danfoss typically being the best and Prince and Brand of similar quality. Parker, Eaton, Rexroth also make mobile valves but I am not familiar with their product offerings.

 

[MinnesotaEric]

Often, a BSPP fitting will thread into banjo ports. See if your local shop has any, or order some cheap caps and plugs online for "gauges". I'll help search for a subplate later...

Kenny, the BPP/BSPP tip panned out! Thank you.

I can now get rid of the weird, unidentifiable banjo fitting, screw in a fitting and hit it with a JIC elbow hose end.

 

[MinnesotaEric]

Eric,
What is the ultimate intended use(s)for the added valve(s)?
If you just want to run a grapple the diverter would be the simplest method.
If you want to run multiple functions then adding valves may be the better option.

For open center (series) circuits it is hard to beat cast iron mobile valves Vs industrial D03 / D05 style valves since mobile valves use a parallel circuit they are typically very low pressure drop. You can get both in either electrical or manual operation so it is just a matter of determining what you want to do with these extra functions.

For industrial D03 / D05 size valves I would consider Eaton-Vickers, Parker, Rexroth, Dynex-Rivett and good name brands. Northman is usually not a close quality match to any of these. Nachi lands somewhere between , Northman and the name brands. Industrial advantage is spool selection and potential for stack modules for function control. Example of stack functions are; cross-over reliefs, flow controls, reducing valves, check valves, etc..

Mobil valves: Most common are Prince, Brand, Husco, Sauer Danfoss with Husco & Danfoss typically being the best and Prince and Brand of similar quality. Parker, Eaton, Rexroth also make mobile valves but I am not familiar with their product offerings.

I want to be able to run both a 72" Wick Root grapple from Everything Attachments and a 8' Hiniker plow, both of which I've already purchased.

 

[J_J]

You can go up to a DO5 manifold, and it will work fine, your choice.

Valve has to match the manifold.

Most manifolds only have 4 ports.

Pressure in

Flow OUT

A port

B port

If you want special, you can add a gage port, a relief port, etc.

You can also get a two valve manifold and a three valve manifold, and probably more if you need them.

 

[oldnslo]

I want to be able to run both a 72" Wick Root grapple from Everything Attachments and a 8' Hiniker plow, both of which I've already purchased.

If you can live with the curl function doing dual duty then the diverter system would potentially be less work and serve your needs. This would also allow you to have some feathering or speed adjustability with your joystick Vs an electric valve which is on / off like a light switch.

 

[kennyd]

Kenny, the BPP/BSPP tip panned out! Thank you.

I can now get rid of the weird, unidentifiable banjo fitting, screw in a fitting and hit it with a JIC elbow hose end.

Awesome :thumbsup:

Sounds like your in good hands with oldnslo also with the valve/subplate, so I wont confuse that issue.