×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

OPen center circuit

OPen center circuit

OPen center circuit

(OP)
Hi,
i am working for a compagny that sell CAN Actuator for agricultural valve like the one mounted on the 6000 JD Tractors. In order to understand the product of our customer i try to figure out how work an open center hydraulick circuit with more than one valves? Untill now i get trouble to imagine how the system keep pressure?

Thanks in adavance for your help

 

RE: OPen center circuit

I don't know anything about stack valves.

In an open center circuit with one valve, the pump pressure is ~zero (and flow just goes back to the tank) until the valve is moved away from center.  Then the pressure rises enough to move the load.

 

Mike Halloran
Pembroke Pines, FL, USA

RE: OPen center circuit

The system uses a valve stack with what is called a power-beyond feature.  Flow passes through the valve stack until one of the valve functions is activated and directs flow to that function.
Here is an explanation reference:
http://www.insidersecretstohydraulics.com/power-beyond.html

Ted

RE: OPen center circuit

That's the normal operating status of an open-center system.  Pump delivers full flow at zero pressure because it just circulates through the valve back to the tank with no restriction.

Acuating a function makes the pressure rise just enough to overcome whatever load is being applied (more demand for work equals more pressure).

When the load stalls (such as a cylinder hitting the end of the stroke) the pressure goes to relief valve setting.

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


Resources

eBook - 10 Reasons to Choose CATIA on the Cloud
To compete in today’s fast-paced and competitive market, smaller and newer firms need a powerful platform that will enable them to compete with bigger players, without the heavy investments needed in computer hardware, software and personnel. Download Now
White Paper - Smart Manufacturing for Electronics
This white paper describes a transformative approach to electronics manufacturing made possible by the addition of Mentor Graphics to the Siemens family. It describes a completely digitalized strategy that supports both printed circuit board (PCB) and mechanical design and manufacturing, uniting the entire product lifecycle – from idea and production to customers and back. 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