help for plumbing a prince rd500 priority valve with loader valve and steering valve

[Yoseph]

i recently both a prince priority valve rd500, and need help how to connect the return from steering pump, i want to make it available for other componant if there is no steering, how i could do that
do i connect it with T to the inlet loader valve or any other issues, thanks in advance, apologize for my poor english

 

[fcoats]

You might post under hydraulics and have better luck with an answer.

 

[BHD]

From what I read the Rd500 is a flow divider not a priority valve, If I am reading correctly it is to split a flow into two parts, but the one flow can be used for priority circuits.

RD200 Series: These pressure-compensated flow dividers split one inlet flow into two nearly equal outlet flows and are for use in systems including double-acting cylinders or birotational motors. Pressure compensation maintains the divider ratio with quite different loads on outlet ports provided that inlet flow falls within the recommended range. 3,000 PSI max.
...
RD500P: Same as RD200 Series except have one adjustable oriface allowing the divider ratio to be changed in the field. 3,000 PSI

in my under standing a priority valve sends a stream of fluid to a device regardless of the demands of the rest of the system, (at least that is what is done on my tractor for the steering).

the unit you have the R500 is adjustable from what I read,
http://www.federalfp.com/pdf/Prince Valves Flow Control.pdf
is adjustable so one should be able to adjust the flow to the steering valves needs, and then it should go back to the tank, and the other side should run the rest of the hydraulics,

that is what priority means is things that need to work regardless of the other items PRIORTY, steering and brakes, and the other is secondary, items that may be interrupted at times with out danger or safety problems,

on many valves if I operate the first valve in the series only that circuit will function until I reduce the flow or stop, the purpose of the priority circuit is to keep fluid flowing to the steering at all times, if one put a tee in the line then you defeat the purpose of the circuit, because there is no longer a priority to the flow, it is general flow,
(and if your system is open center most likely you will be dumping (return Line) the fluid through the center of the valve you have it tee off to or vice versa).

if you want to work more valves down line you need a power beyond valve, (it is different than using the return as the pressure is not building up in the return circuits of the first valve, there is a by pass sleeve that carries the pressurized fluid to the next valve, or valve stack.

hope this helps

 

[J_J]

This valve is an adjustable priority divider valve.


Prince Hydraulics > Products > Hydraulic Valves > Flow Control > Model RD500

Adjustable flow hyd valve. Adjustable from 2 -12 GPM

The priority flow is always there if you have enough pump volume.

The excess flow is available for other hyd functions.

 

[J_J]

Yoseph,

Whatever comes out of the excess flow is usable in other hyd circuits.

If the priority takes all the pump flow, there is none for the excess flow.

If your tractor has 10 GPM for pump flow, then you might set the valve for 2 GPM for the steering, and the excess flow of 8 GPM for the loader valve. This is if you run the tractor at full rpm.

Flow from the steering valve goes to return/tank line.

 

[Yoseph]

i installed my rd500 but there is too mutch flow for my steering system, now i am thinkig to add a restrictor vale on the controled flow line, is that plumbing will damage my rd500 or it will redirect the flow to the exces flow port ???
thanks every body