Hydraulic motor Spool valve & Flow Control valve

[bigdan65]

I am adding front hydraulics to run a hydraulic motor. The motor cannot use the full flow of the tractor. I want to put the Flow Control before the Motor Control valve so I can reverse flow at the controlled rate. The motor spool valve will be the last valve in system. Can I Tee the EX flow of FC valve and T tank port of Motor spool valve?

 

[oldnslo]

Yes you can tee the excess flow into return from the motor directional control valve.

 

[Smokeydog]

No problem doing what you have drawn.

There are a number of factors that effect flow. Losses from valves, fittings, lines and hoses adds up. Used a 12gpm hydraulic motor for a FEL pole chainsaw on a 16gpm 3rd function tractor. Intermittent use, usually near idle. So far no trouble even with occasional dead heading from stalled motor. Commercially made similar saws use smaller motors for over a wide range of tractors flow capacities.

Adding 36’ of hose and fittings reduces available flow. Used 1/2” hose to reduce loss. Use a small metering flow control valve at the motor to provide a drop of fluid every 10 seconds to the saw chain for lubrication.

Use same saw on a 7gpm 3rd function tractor with little difference in function.