3rd function valve comparison

[Dave M7040]

Thanks everyone for your time and opinions.
It's tough for me to make a decision for something like this. I want to get it right the first time!
I just couldn't come up with a reason not to so I guess I'll have to get the Summit Hydraulics 3rd function kit on order.
thanks again,
Steve

In doing the Google search you suggested, I was struck by the fact that the Summit valve only seems to have 4 ports....

You stated in the beginning you wanted a valve but never described the reason you wanted the valve.

I am concerned that you have not adequately described your plans to Summit.!

Typically you need a valve with 6 ports to control two different double acting hydraulic circuits.

Each pair of two ports goes to a double acting cylinder and the last two ports are the In from the pump and the out to the reservoir.

Dave M7040

 

[ericm979]

Dave you're thinking diverter. This is an electric SCV.

 

[Dave M7040]

Dave you're thinking diverter. This is an electric SCV.

I am not differing with you, I just don't feel from the beginning the owner has described his needs and is possibly using terms he does not fully understand.

If he really needs an electric SCV, what is he going to feed it from?

Dave M7040

 

[oldnslo]

Steve
I presume that you are looking at the cast iron monoblock from Summitt Vs a D03.

The main differences are
the monoblock is a mobile valve in that it can be configured for open loop fixed displacement pumps or closed loop variable volume pumps.

monoblock will require five hoses if used in power beyond system ie. a dedicated tank line

Functionally they will provide the same operation

No proof but I suspect there will be less pressure drop on the monoblock vs D03. This is an important consideration for true third function valves

Hopefully this information will help you understand the difference between the valves

 

[Steve 3650]

I think I understand, but I've been wrong before!
My purpose is to operate a grapple. I have not spoken directly with anyone from Summit. All information I have spoken about came from their website. My understanding is that the kit that I am looking at was designed for that specific purpose. I will try again to add this link and if it is successful you can tell if I am thinking correctly or not.

[URL="https://summit-hydraulics.com/product/hydraulic-third-function-valve-kit-w-joystick-handle-for-tractor-loader-13-gpm/"

 

[ericm979]

The 3rd function would be plumbed into the chain between the loader's PB port and the next set of valves. Which would be the 3pt if there's no other valves. The 3rd function will open and close the grapple at full speed when you press the open or close button. A diverter takes (usually) the loader's curl circuit and lets you shift it between normal operation or operating the grapple, by pressing a button on the joystick. An advantage of the diverter setup is that you can feather the grapple. A disadvantage is that you can't curl the grapple and open or close it at the same time. You can in theory with the 3rd function though in practice maybe not- if you open valves to two cylinders at the same time, the one with the least resistance moves while the other one sits there until the resistance on the first rises enough.

Loaders with regen on the curl circuit (which is common but not universal) will make the grapple act funny. I'm not exactly sure how but people who know more than me say to not do it. The diverter system requires you to center the joystick, press the button then move the joystick to one side or the other. The 3rd function just means pressing one of the buttons.

There are people happy with both systems, it's just up to you (and your curl curcuit) which you want to use.

 

[Steve 3650]

Steve
I presume that you are looking at the cast iron monoblock from Summitt Vs a D03.

The main differences are
the monoblock is a mobile valve in that it can be configured for open loop fixed displacement pumps or closed loop variable volume pumps.

monoblock will require five hoses if used in power beyond system ie. a dedicated tank line

Functionally they will provide the same operation

No proof but I suspect there will be less pressure drop on the monoblock vs D03. This is an important consideration for true third function valves

Hopefully this information will help you understand the difference between the valves

oldnslo
Thanks for helping.
I am feeling less knowledgeable all the time. If I understand you the D03 valve has 4 connections but the monoblock valve requires 5 connections. If there is less pressure drop, this would be good?
I think I should Summit and talk to someone about this potential installation?

Thanks,
Steve

 

[oldnslo]

Steve
If you look at the single spool monoblock on the Summit website it states convertible to power beyond must order conversion plug separate. I would definitely call summit to see if the 3rd function kit is set up for power beyond.

The tank port on that valve is only rated for 725 PSI.

 

[ThisJustin]

Another consideration is your tractor's pumping capacity. If you don't have the capacity to run two or three functions at once at a usable speed then a third function as you imagine it will seriously disappoint you. Here is the kit I just bought:

Hydraulic Multiplier Selector Diverter Solenoid Valve w/ Switch & Ag Coupler Kit

 

[Steve 3650]

Steve
If you look at the single spool monoblock on the Summit website it states convertible to power beyond must order conversion plug separate. I would definitely call summit to see if the 3rd function kit is set up for power beyond.

oldnslo
I spoke with a very helpful guy at Summit. You are correct. I will need a fitting that is not includeline d in the kit. The monoblock valve has a port that needs to go to the return. He said it could be teed in to the return line at the fel valve or where ever is convenient based on the location of the valves.
I'm glad I called and spoke to him.
Thanks,
Steve