3rd function valve

[J_J]

This term is used a lot, so where did the term 3rd function come from? I have searched the internet and can not find a definitive answer.

Could it have been derived from, say the third valve in a tractor hyd system?

If that is true, what is the first and second function, and possible a forth and fifth valve.

Consider this, that most all tractors come with a 3pt valve and sometimes is the only valve on the tractor.

So, could the 3pt be the first function valve and perhaps the loader valve be the second function valve, and any valve after that becomes the 3rd function valve.

What is true 3rd function, is it a solenoid valve on a subplate operated by a switch.

Is the diverter/selection valve a 3rd function valve? The diverter valve is not in the normal flow path until the loader valve is activated. Could it be called a secondary valve.

What is electric over hyd , and is that any valve using a solenoid valve for operation?

How does one install valves in a multi valve subplate with a series flow path, does the first valve have priority or will any valve operate at any time.

How about series parrallel subplate, Does any valve have priority? Can I mix cyl valves with motor valves?

If I have three solenoid motor spools on a series parrallel subplate, how many motors will work at the same time?

These things have been on my mind, but not really.

 

[AaronS]

This term is used a lot, so where did the term 3rd function come from? I have searched the internet and can not find a definitive answer.

Could it have been derived from, say the third valve in a tractor hyd system?

If that is true, what is the first and second function, and possible a forth and fifth valve.

Consider this, that most all tractors come with a 3pt valve and sometimes is the only valve on the tractor.

So, could the 3pt be the first function valve and perhaps the loader valve be the second function valve, and any valve after that becomes the 3rd function valve.

What is true 3rd function, is it a solenoid valve on a subplate operated by a switch.

Is the diverter/selection valve a 3rd function valve? The diverter is not in the normal flow path until the loader valve is activated. Could it be called a secondary valve.

What is electric over hyd , and is that any valve using a solenoid valve for operation?

How does one install valves in a multi valve subplate with a series flow flow path, does the first valve have priority or will any valve operate at any time.

How about series parrallel subplate, Does any valve have priority? Can I mix cyl valves with motor valves?

If I have three solenoid motor spools on a series parrallel subplate, how many motors will work at the same time?

These things have been on my mind, but not really.

I try to follow and all I see is "If 3 rabbits and 2 squirrels were wearing purple shorts on a Tuesday equals green aliens." All Greek to me, which I hate because I'd like to add this to my tractor.

 

[J_J]

Which simply means that you need to educate yourself with more hyd expertise.

Just ask your questions and someone will answer.

 

[ishiboo]

Third function is pretty self-explanatory since it's supposed to refer to only loader valves. The lift and bucket curl are the first two functions, to add a grapple/etc. you add a third function.

Some people now call rear remotes/etc. "third function valves", no point in arguing semantics with people but it confuses things.

 

[J_J]

What is your reference for the 3rd function being associated with the loader valve .

Can a 3rd function valve not be located anywhere in the hyd flow path, and not be associated with the loader valves?

It only confuses things when people don't know what they want or how it works.

 

[ishiboo]

It's just what the term is used for. It does not need to be part of the loader valve, it simply references the loader valve's two functions. It does not matter where in the hydraulic flow path it sits. Its just the third valve for a loader accessory.

 

[/pine]

No basis for this but it's a "3rd" so that implies that there are/were two other "functions"...i.e., boom/bucket for a loader...top link/side link for the 3PH...

But then they should call the SCV for a backhoe thumb a "6th" function ?

 

[the old grind]

Of course all this is 'open center' talk when we're using the diverter in a 'DPDT' role where all components are connected 'in series', where anything plumbed downstream gets only what's left over when something upstream is (parially) activated, and I guess calling front remote a third function 'of the loader valve'. Wouldn't this also be a way to add another rear remote as a 3rd function of its control valve? (how do they plumb multiples, anyway??)

I mentioned foot switches (vs on loader stick, etc) on another thread and laughed at myself for the geeky excess of it, but still went looking for possibilities. :confused2: I found 6" x 8" & 12" x 12" mats, wallet-sized treadle-pedals, and a fist sized bulb-looking (weather seal) in supposedly waterproof versions with 2 meter cables and apparently suitable SPST contacts for a 12v diverter valve.

If there's any finesse to installing this sort of setup, it looks like it'd be mounting/routing things to not make normal service access much more difficult without removing the FEL. (can get cozy <30hp or so?) The right pieces need to separate as easily and as neatly when you do too, IMO. I'm glad I looked my loader valve over well ahead of takin' 'er in and got an preview of what will fit where and can be plumbed when I talk to my installer. (He has all the parts/pieces and a heated shop. I have neither)

btw: It looks like my '3FV' will have to go on the loader tower vs the valve tower that stays with the tractor. That way, I can use the lift QDs 'as is' and the the curl take-offs (their lines to it without QD) to the diverter and have only two more QDs to mess with altogether (@ SSQA). Wonder how soon I'd forget to unplug the wire and pull something apart. :duh: I'm also likely to have a snake pit of rubber making the engine oil stick even tougher to get at. :hissyfit:

Don't mean to hijack, J_J, this thread isn't about me, but I wanted to share because I'm ridin' this theme in the coming days or weeks. (OK, maybe weeks, then ) How about I just bump the button once in a while with nothing connected to the front remotes and take a selfie eek right when I deadhead the system? ....

 

[juddspaintballs]

First function: raise and lower front end loader
Second function: curl attachment on the end of the FEL
Third function: anything additional on the FEL like the clamping action of a grapple

It is possible to use rear hydraulics to run a third function on the FEL, although the rear hydraulics aren't really referred to as the third function (nor are the first two functions of a FEL referred to as first and second function). Third function is simply the terminology used when adding a third type of hydraulic movement on the FEL.

 

[Leejohn]

Anytime there is more then one spool the 1st one that gets pressure is the 1st, next inline is the 2nd, then the 3rd is the 3rd function. Each spool is a function and it doesn't matter what it feeds. It's the flow path of the pressure from the pump. The big ? when asking about 3rd function is to ask what it is going be used for.