question about flow divider valves

dgarrett · Oct 23, 2014

Hello,

I was hoping someone could help me understand the specifications for this flow divider valve: 3/4" NPT 16-30 GPM DIVIDER VALVE

It states 16-30 GPM, now is that a standard way of stating the valves min and max inlet GPM, or is it stating that the out pressures can equally be divided into separate flows with each of the two flows having a possible flow range of 16 to 30 GPM assuming the inlet pressure is 2 x the outlet flows?

Thanks in advance.

boggen · Oct 23, 2014

you need to get a valve that meets or exceed max pressure of the system / tractor. (factor 1)

GPM, and inside diameter and passage ways within the divider valve are a different story... and there 16 to 30 GPM is suggest range you want to flow into, (if going in on one side and splitting it to 2 outlets), or combining 2 inlets and sending it through 1 outlet. if you go over the GPM, your more likely to cause to much friction. and cause excess heat build up. if ya don't flow enough, no big deal, but if you never go above 16GPM, then ya most likely buying to big, and could use a smaller divider valve that has smaller inlet/outlet sizes. buying to large can have bad effect of more internal leakage of fluid around the valve.

it gets rather complicated quickly calculating fluid flow rates and sizing stuff. and to dumb things down. a min/max range is given. it is not exact but good enough estimate to go by for most applications.

LD1 · Oct 23, 2014

It would help us tremendously if we knew what you were trying to do.

Your first assumption is correct. 16-30 is basically the min-max GPM input for that valve.

However, twice in your post you and getting confused about flow and pressure.

First when you said"out pressures can be equally divided into separate flows"

Second when you said "assuming the inlet pressure is 2x the outlet flows"

Pressure and flow are different. That valve won't change the pressure. Only the flow.

IE: you input 24 GPM @ 2000psi, you get two outputs of 12gpm but still @ 2000psi.

dgarrett · Oct 23, 2014

My mistake, I meant flow not pressure.

I am trying to design a circuit to control two motors of the same size with one pump. The pump has 1500 psi and the motors need to have the highest torque possible so running them in parallel would be better from a torque stand point. Basing this off of the motors having to split the pumps pressure capacity so 750 psi per motor if run in series.

boggen · Oct 23, 2014

more details. what will these motors be used for? or what you want from them?

your pressure splitting, maybe exact opposite of what you are wanting.

for most part you only control GPM, and pressure is constant, and in that you control RPM's, and torque is constant. but it is all in the details...

examples....are you want both motors running at same time, or one off, while other is on? are you wanting them to run at different RPM's such as wheel motors for some home made tractor or like? are they being used to feed some sort of material and you need constant RPM's from both?

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if pump has 1500 PSI max, then you can go with a smaller cheaper unit, in the 1500PSI max. no need to get something rated for 3000PSI. or less ya find one heck of a deal.

J_J · Oct 23, 2014

dgarrett said:
Hello,

I was hoping someone could help me understand the specifications for this flow divider valve: 3/4" NPT 16-30 GPM DIVIDER VALVE

It states 16-30 GPM, now is that a standard way of stating the valves min and max inlet GPM, or is it stating that the out pressures can equally be divided into separate flows with each of the two flows having a possible flow range of 16 to 30 GPM assuming the inlet pressure is 2 x the outlet flows?

Thanks in advance.

To use this divider valve, you need a 16 GPM to a 30 GPM pump.

It will divide the flow into two equal paths.

The pressure will be determined by the load on each path.

It will handle up to 3000 psi.