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

Efficiency vs Longevity. Spool valve construction matters

Efficiency vs Longevity. Spool valve construction matters

Efficiency vs Longevity. Spool valve construction matters

The tractor trailer hydraulic systems I work with need to be robust more so than efficient. A customers tractor has about 300 hp available for the PTO pump and may have anywhere from 8 to 50 GPM available flow. This creates an enormous challenge by itself but the biggest challenge is trying to convince an entire industry that hydraulic oil filters are necessary on modern hydraulic systems. Our standard system uses Wolverine Mono Block valves without a filter that have historically survived high levels of oil contamination and rigorous use. Filtration only became an issue when we decided to offer electronic controls as an option. These systems contained cartridge style directional control valves with various pressure and flow compensation. We ended up with numerous problems ranging from stuck spools to phantom movement of components and ultimately complete loss of system operation and the only thing we could do was change the cartridge valves and try to convince the customer to change their oil filter. I have found that the construction of the spool valve in our manually operated systems have metal on metal hardened seats where as the cartridge style valve use a viton rubber on metal seat. Being that I have no control over what a customer does to their hydraulic oil, my though is, that I could get a longer life span out of a valve with metal on metal seat which leaves me to piece the system together myself. My question to all the hydraulics engineers out there is; Why is there not a standard off the shelf electronically controlled hydraulic system available that is suitable for this huge industry?

RE: Efficiency vs Longevity. Spool valve construction matters

In any industry, for a standard to exist there must be some group with sufficient financial interest and sufficient market influence to create one. If individual makers don't see the value in potentially increasing profits for their competitors they won't do it.

RE: Efficiency vs Longevity. Spool valve construction matters

Each vehicle manufacturer is very protective of their particular hydraulic system, good, bad, or adequate. As an attachment supplier, it is a continuous struggle to implement better hydraulic system design that would be good for both vehicle systems and attachments.


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


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
The Great Project Profitability Debate
A/E firms have a great opportunity to lead the world into the future, but the industry’s greatest asset—real-time data—is sitting wasted in clunky, archaic ERP platforms. Learn how real-time, fully interactive dashboards in a modern ERP allow you to unlock data that will shape the future of the world. 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