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

What kind of hydraulic valve is appropriate for double acting test devices

What kind of hydraulic valve is appropriate for double acting test devices

What kind of hydraulic valve is appropriate for double acting test devices

Hi professionals

We are working on a bending test machine that applies reciprocating force on a product. It goes to right and when the force reaches to a specific value it stops and returns to the left and when it reaches to that value again it stops and this cycle continues for 1000 cycles. We get feedback from a force sensor and the graph should be semi sinusoidal. We have made a hydraulic unit with a 3 phase simple 2 directional valve and we control the pump speed by a simple driver. But it doesn't work, because in low speeds the pump doesn't work properly and we have some air traps inside the system. I think we should use proportional valve so that the pump can work in nominal speed. And here is the question: Can we solve the problem by using the proportional valve and a control circuit?
Thanks for response

RE: What kind of hydraulic valve is appropriate for double acting test devices

A small servo quality valve with a zero or underlapped spool will work. You should use a small accumulator so the supply pressure can be kept relatively constant. Also, keep the cylinder as short as possible. The smaller the volume of oil being compressed the smaller the volume required to compress it.

The frequency, amplitude and offset were not mentioned.

If you go to the applications area on the website we have a small app note on a project just like the one you describe.
In this application they were testing joints by pushing and pulling just as you have shown in your diagram.

I can supply more information upon request.

Peter Nachtwey
Delta Computer Systems

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