hydraulic question

Arborist Forum

Help Support Arborist Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

streetbros

ArboristSite Lurker
Joined
Feb 26, 2009
Messages
22
Reaction score
0
Location
VA
I was hoping someone could help me out. Can anyone tell me what this grey box is in the picture? By the description it says that the "Valve on return stroke will open and let fluid bypass control valve." If adding this to my splitter will decrease my cycle time am all about it. but I have no idea what it is
204068d1319381266-img_0794-jpg



Thanks
STREET
 
Last edited:
flow control valve etc.

I was hoping someone could help me out. Can anyone tell me what this grey box is in the picture? By the description it says that the "Valve on return stroke will open and let fluid bypass control valve." If adding this to my splitter will decrease my cycle time am all about it. but I have no idea what it is
204068d1319381266-img_0794-jpg



Thanks
STREET



The addition of a flow directing check valve is a
waste of good money and time for a log splitter.

All it is doing is redirectling the small volume of oil
back to the spool valve.


The additional hosing and fittings would be better
spent on second valve and log lift addition.


If you want to help your log splitter work better look up my
thread discussing the use of check valves in a race track
configuration to aid in heating the oil faster and making the
log splitter more efficient by heating the oil continually to
increase the pressure available by heating the oil flowing
through the log splitter at at much faster rate making
it more efficient by making the oil more slippery and
thus more effcient.
 
I believe what you have is a pilot operated bypass valve. Basically when the spool is put in the return position it pressurises the pilot in addition to the rod end of the cylinder. The pilot opens a bypass valve that allows the return fluid from the closed end of the cylinder to go around the valve. The net result is the return stroke is faster since it should have less resistance.

The other thing you sometimes see is a flow combiner that takes some flow from the rod end of the cylinder and combines it with the flow from the pump to make it extend faster. They shift from high flow low pressure to low flow (deactivated) high pressure when the pressure meets a threshold. These are usually used with a single stage pump that are not real common on log splitters (tow stage is the rule). It in effect does the same job as a two stage pump. The proper name is probably a regenerative valve instead of a combiner.

Don
 
Thanks

Thanks for the replay. I am just looing for ways to decrease my cycle time with out buy a bigger pump/motor.
 
don had the explanation. pilot operated valve that opens to send oil from cylinder directly to return without going through the spool valve.

It bypasses the spool valve to reduce pressure drop on the return direction. In return, you get maybe 30% more flow out of the closed side of cylinder than the pump puts in, because of the difference in the two areas. Pushing that through tyhe spool valve that is probably already overrated means high pressure drops and heat.

Unless the flow forces pump oil across relief, or causes the pump to unload to the low flow setting, it will NOT increase the speed of retract but will decrease the pressure drop and heat. Before investing in one, take a pressure gauge reading on both sides of the cylinder and you can tell how much it will help.
 
I'm not sure if I'm posting in right area I'm new and have a hydraulic question I'm building my own splitter and I would like to make the cyclinder Cycle continously forward and backward but I can't find a valve to do this I only find double detent to complete one Cycle I need it to run full stroke forward and reverse over and over again is this possible
 
I'm not sure if I'm posting in right area I'm new and have a hydraulic question I'm building my own splitter and I would like to make the cyclinder Cycle continously forward and backward but I can't find a valve to do this I only find double detent to complete one Cycle I need it to run full stroke forward and reverse over and over again is this possible
It's not too hard to accomplish but man that sounds dangerous.
 
I'm not sure if I'm posting in right area I'm new and have a hydraulic question I'm building my own splitter and I would like to make the cyclinder Cycle continously forward and backward but I can't find a valve to do this I only find double detent to complete one Cycle I need it to run full stroke forward and reverse over and over again is this possible
You need to start your own thread. The problem with posting in an old thread is your question could get missed. People will start chiming in on the original posters question.

Sounds like you need one with a detent to hold forward. I don't know how they get an auto return on the splitters but someone will.
 
You need to start your own thread. The problem with posting in an old thread is your question could get missed. People will start chiming in on the original posters question.

Sounds like you need one with a detent to hold forward. I don't know how they get an auto return on the splitters but someone will.
Federal makes a auto-cycle valve ..
 
I plan on using an arm that reaches around for a log return and it would split through a bundle screen instead of a 4,6,or 8 way wedge so if I could make it Cycle continously it would split it while I got more pieces or cut another piece
 
Continuous cycle would be a very bad ideal. It is easy to do but very dangerous. I dont even like the autocycle valves. I just feel I need some sort of personal input as to when and where I want the cyl to stop. With a continuous cycle, you have even a momentary lapse of awareness and you could easily loose a finger, hand, arm, or worse, before you can take any action to prevent it. A autocycle valve is not quite as bad as it does take input from the operator before it will cycle which gives you time to make sure nobody has their hands in the way, but once you hit that lever its going to make a complete cycle, or at least cycle until the pressure setting is reached, which is way more than enough to cut off a finger. I would at the very least have to know a little more about your splitter plans before I would even attempt to offer advise or suggestions. Just because it can be done, doesnt mean its should be done.
 
I plan on using an arm that reaches around for a log return and it would split through a bundle screen instead of a 4,6,or 8 way wedge so if I could make it Cycle continously it would split it while I got more pieces or cut another piece
That makes sense.

I Don't know squat about production wood processing but I'm guessing a bundle screen makes very small splits..like 2"x2" or so?
 
Any auto return cycle splitter I've used could be stopped mid stroke in either direction just by bumping the lever.
 
Not disputing how a autocyle valve works. Even a normal self centering valve will continue to work if you keep the lever pushed/pulled. Which is my point. With a auto cycle valve, if you want to control it, you have to keep your hands on the levers. Simply hitting the lever and turning away, the valve will cycle until detent pressure is met and then return. If you walk away from the valve while the cyl are in cycle, the cycle is going to complete, whether or not someone has their hands in the way. Lots of folks like them and use them, but I prefer to not use them if I am going to have others working with me. Personal preference. Doesnt mean they are unsafe, or are super dangerous, but the potential is there if the users are careless. Same can be said for using a normal valve. If the operator is a dangerous person that doesnt pay attention all the time, bad things can happen.
 
I appreciate the advice and concern for safety the plan would be to use a screen that splits 4x6" pieces and 8"×24"cylinder 28gpm two stage pump with 24hp Honda engine
 
A 8x24in cyl is going to be very slow, even with a 28gpm 2stage pump. I am having a hard time deciphering what you are referreing to when you say splitting thru a screen. is this some sort of multisplit box wedge?
 
Back
Top