Valve education?

[dcyrilc]

OK, this is for all you knowledgable folks out there who have been playing with hydraulics since before there was dirt.

I'm eventually going to be adding rear hydraulics to my 2240 tractor with CC hydraulics. I figured it was time to begin looking at valves to see what I will need.

There are A LOT of different types of valves out there. How do I decipher the different valves to know what they are and how they will work?

I realize that my valves will need to be CC, but single acting, double acting, single spool, double spool, stack, etc... what are they?

Further complicating things, how do I know the difference in spools? I have read threads on different types that respond differently for opening and closing proportions, etc.

 

[AKKAMAAN]

OK, this is for all you knowledgable folks out there who have been playing with hydraulics since before there was dirt.

I'm eventually going to be adding rear hydraulics to my 2240 tractor with CC hydraulics. I figured it was time to begin looking at valves to see what I will need.

There are A LOT of different types of valves out there. How do I decipher the different valves to know what they are and how they will work?

I realize that my valves will need to be CC, but single acting, double acting, single spool, double spool, stack, etc... what are they?

Further complicating things, how do I know the difference in spools? I have read threads on different types that respond differently for opening and closing proportions, etc.

You will have to learn to read and understand hydraulic valve symbols....

 

[dcyrilc]

What are the differences between "SV valve", "20 series valve", and "cesna valve"?

I think I figured out everything except the cesna.

 

[AKKAMAAN]

What are the differences between "SV valve", "20 series valve", and "cesna valve"?

I think I figured out everything except the cesna.

The pic I Posted is from the Prince 20-series valve spec pdf file....SV valve and cesna valve I dont know....where did you get all those terms first of all....???

Cessna is a manufacturer brand....aircraft maker that also makes hydraulic parts....

 

[kennyd]

What are the differences between "SV valve", "20 series valve", and "cesna valve"?

I think I figured out everything except the cesna.

SV and 20 Sereies are "stack valves" from Prince...just a model number for them. Stack valves are Ala cart...you buy each piece (section) to build a valve that meets your needs.

Cessna is just a company that makes valves, it's not a "type" of valve. Husco, Dinoli, Gresen, Cross, Sauer/Danfoss are some others that are commom names.

"Spool" is just a term for how many sections or functions a valve can do. Like a loader valve has two spool's-dump/curl and lift/lower.

SA (single acting) valves are made to operate SA cylinders only-those with only one hose attached to it.

DA (double acting) valves are made to operate DA cylinders-those with two hoses attached. They can also operate a SA cylinder. 99.9% of the valves used on newer machines are DA.

Usually the description of the valve is noted when you buy it. Terms like "work ports blocked in neutral" and "spring return to center" are common and tell you how the valve operates.

Just reading through the Surplus Center website or catalog can be a great education.

 

[dcyrilc]

SV and 20 Sereies are "stack valves" from Prince...just a model number for them. Stack valves are Ala cart...you buy each piece (section) to build a valve that meets your needs.

Cessna is just a company that makes valves, it's not a "type" of valve. Husco, Dinoli, Gresen, Cross, Sauer/Danfoss are some others that are commom names.

"Spool" is just a term for how many sections or functions a valve can do. Like a loader valve has two spool's-dump/curl and lift/lower.

SA (single acting) valves are made to operate SA cylinders only-those with only one hose attached to it.

DA (double acting) valves are made to operate DA cylinders-those with two hoses attached. They can also operate a SA cylinder. 99.9% of the valves used on newer machines are DA.

Usually the description of the valve is noted when you buy it. Terms like "work ports blocked in neutral" and "spring return to center" are common and tell you how the valve operates.

Just reading through the Surplus Center website or catalog can be a great education.

Thanks kennyd.

 

[dcyrilc]

The pic I Posted is from the Prince 20-series valve spec pdf file....SV valve and cesna valve I dont know....where did you get all those terms first of all....???

Cessna is a manufacturer brand....aircraft maker that also makes hydraulic parts....

From the Surplus Center website, under the list of valves. https://www.surpluscenter.com/item.asp?UID=2116012207371877&item=9-2594&catname=hydraulic https://www.surpluscenter.com/item.asp?UID=2116012207371877&item=9SV-1-Z&catname=hydraulic

A Cesna valve is also listed on JD Parts as one of the possible loader valves for my 145 FEL.

OK, gotta leave for work.

 

[Kubota Greg]

I just went through this to some extent as I am going to buy a new valve for the used loader i just added to my tractor. I am going to buy a double acting 4 spool valve with Power Beyond. I only need 2 for the loader, but while i am spending $ and installing, I thought it would be nice to have an extra port already plumbed in for my grapple I plan to add, and a 4th valve for anything else I might dream up. I will extend to the 2 loader valves handles out so I dont grab the wrong handles since i will be using those 99% of the time.
Burden Sales Surplus Center Item Detail

 

[oldnslo]

OK, this is for all you knowledgable folks out there who have been playing with hydraulics since before there was dirt.

I'm eventually going to be adding rear hydraulics to my 2240 tractor with CC hydraulics. I figured it was time to begin looking at valves to see what I will need.

There are A LOT of different types of valves out there. How do I decipher the different valves to know what they are and how they will work?

I realize that my valves will need to be CC, but single acting, double acting, single spool, double spool, stack, etc... what are they?

Further complicating things, how do I know the difference in spools? I have read threads on different types that respond differently for opening and closing proportions, etc.

By CC, I presume you mean closed center. Is this true and do you know the difference between closed center and open center hydraulic systems?

If not where did you get the CC requirement from?

Once these questions are answered we can go on to these.

What do you want to do with this valve?

How are you going to plumb it in?

Roy

 

[kennyd]

By CC, I presume you mean closed center. Is this true and do you know the difference between closed center and open center hydraulic systems?

If not where did you get the CC requirement from?

Once these questions are answered we can go on to these.

What do you want to do with this valve?

How are you going to plumb it in?

Roy

He has an older JD tractor, it is indeed a CC system.