How do you adjust a hydraulic valve?

[Junkman]

Re: How do you adjust a hydraulic valve? *DELETED*

Here is what the Tee connection looks like. The line on the extreme right is the Return Port and the one in the middle is the Pump Port. The one on the left is the Power Beyond Port. Too cold outside to take more pictures and set up to take readings. Will have to wait for a warmer day. Junk..

 

[rambler]

Re: How do you adjust a hydraulic valve? *DELETED*

Junkman, are these 'Tee' connections on the lines coming from your pump (not familiar with disconnects at such a spot), or are they the normal loader disconnects - which are after the loader joystick contoller stack & before the loader cylinders?

--->Paul

 

[PineRidge]

Re: How do you adjust a hydraulic valve? *DELETED*

This is what Junk said in an earlier post:

<font color="blue"> This is how the valve is plumbed into the system. I disconnect the hoses going to the loader valve and put these in between the loader hoses.... </font>

 

[Junkman]

Correction..... I mis identified the valve as being a Parker valve, when it is in fact a Prince valve. Not that this should make a difference, but I don't want to mislead anyone. Sorry for the error...... Junk

 

[PineRidge]

Junk at the risk of sounding a bit excited when is the unveiling of your recent addition to the Kubota family? I would really like to see how it looks mounted.... /forums/images/graemlins/smile.gif

I mean attached.....

 

[kubmech]

Whiterock, I too have never seen a cc valve used with a fixed displacement pump, until now. I also don't think there is a restrictor added to this particular set-up but referenced it for clarity. Yes, my proof reading got a little sloppy and I teed instead of looped, but at least you new what I meant /forums/images/graemlins/blush.gif

 

[Junkman]

To keep the record straight, there is no restrictor in the system unless it is placed there by Kubota. The only restriction is for people to be able to think outside the box and accept this as a viable way of hooking up the grapple... /forums/images/graemlins/grin.gif

 

[Henro]

I posted a related question in the Attachments Forum Here if anyone is interested... /forums/images/graemlins/smile.gif

 

[Banjo]

I hope this isn't taking the pin out of a grenade again but I got here late from Henro's other post.

BTW, it's probably an engineer thing, but WHY matters to us .

If there's pressure being generated to run the Power Steering (due to there being a load there), then that same pressure flows out the non priority side of the priority valve, and has to be dissapated (as heat) somewhere on it's journey back to the tank (unless it's a rotary flow divider in which case this is not the case). Perhaps this is providing sufficent "system pressure" to run the grapple. I would expect that to get full power (pressure) to the grapple something has to close off the flow downstream (such as moving a spool in one of the OC valves).

The CC valve is not (IMHO) the same as another spool in the main valve, as moving the spool on it does not restrict (close) off the main pressure gallery (to allow the pressure required for that load can be generated by the pump) .

My understanding of hydraulics took a huge leap forward when I thought about the flow coming from the pump, but the pressure working back from the load(s). OC hydraulic systems are like a constant current, variable voltage electrical system, something that's not too common.

Glad that it all works, and appologies in advance if this stirs up the nest again. Apart from that, I'm going to wait for the punch line from the actual readings.

regards, Andrew.

 

[MMM]

Re: How do you adjust a hydraulic valve? *DELETED*

I wanted to wait until the bickering ceased to ask for explanation to this (not the CC VV mystery).

</font><font color="blue" class="small">( The system has to have at least the 1500 PSI all the time or even the 2300 PSI design pressure flowing through it at all times, otherwise the power steering and the hydro wouldn't work. I have had this on for almost 6 months and have never experienced any heat problems on the tractor. )</font>

How can this be? Any energy(press) not absorbed by work is converted to heat when released back into the flow. For whole system to be under constant 1500psi pressure, then dumping it to tank while sitting idle it would have to be a hydraulic cooler on wheels. I run 0-16gpm PFD off a loader pump for aux outlets for backhoe and othe equipment and had to install extra 24X12 cooler for the occaisional loading on that aux circuit. If it were loaded constantly it would cook the system.
Is the fluid released into the air, then falls to tank? That might avoid heating up fluid .
I I don't fathom the 1500psi power steering thing either. My tractor has a PFD that dedicates 2,3 gpm of flow for PS circuit, but wouldn't see 1500psi unless trying to turn while wheels were in a deep rut or against some immovable object. Is 1500psi stored to do 3-400psi worth of work? I mean, I can turn even my not-so-nimble SuperC with my pinky while she's rolling.
Something to do with HST?

Thanks for any insight.