Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

open/closed valve spool

open/closed valve spool

open/closed valve spool

I posted this question awhile back in another forum.

I am stumped!

I currently manufacture hydraulic valves.  which will operate a certain kind of equipment.  I offer either open center valve, or closed center valve.

How can I make One valve to be able to operate on both closed and open center systems?

Presently I am using 2 different valve spools. one for open and one for closed center..

I would like to just make one valve spool that would handle both open and closed center systems..

any help would be greatly appreciated.


RE: open/closed valve spool

If you figure that spool out you will be waaaaaaaay ahead of Vickers, Rexroth, Parker, Denison, DoubleA and any other manufacturer of 3 or 4-Way Directional Control valves I am familiarr with.

One possibility to achieve what you want would be a Pilot to Close Poppet design like Nachi has, or maybe had, have not looked that one up for awile. It uses 4 poppets and a D03 4-Way Directonal Control to pilot the Poppets.

Using a D03 Directional Control with "P" Blocked, "A" and "B" to "T" Center condition gives an All Ports Open center while the same D03 valve with the spool reversed would give All Ports Blocked center.

The Nachi valve only comes in a D08 or D10 size.

Bud Trinkel CFPE
fluidpower1 @ hotmail.com

RE: open/closed valve spool

You need to provide more information about the valves usage, port location requirements, flow and pressure before any suggestions can be made.
Depending on these features and the cost target, will determine options.

RE: open/closed valve spool

various sectional or stacked spool valve mfrs provide a tapped port in the outlet section to convert from open center, closed center, power beyond, etc. functions. These typically have some sort of center pilot signal that unloads the first section.

If this is what you are describing, it should be fairly simple. If you mean both options on the same individual spool machined part, I'm with bud-that is a challenge way beyond my knowledge.


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close