×
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

Hydraulic symbols
7

Hydraulic symbols

Hydraulic symbols

(OP)
What are these hydraulic symbols?
Thanks

RE: Hydraulic symbols

They look like some kind of pressure control valve, the symbols at least look like a combination of a pressure relief and a pressure reducing valve. I'm not sure exactly what they are however. Hopefully that gives you a starting point for some research (or someone more knowledgeable comes along). Here's some links that you might find useful:
How To Interpret Pressure Valves
Pressure Relief and Regulating Valves

RE: Hydraulic symbols

Hello everybody:

That symbol seems more like a Sequence Valve.

El que no puede andar, se sienta.

RE: Hydraulic symbols

A pilot-operated to open check valve. Downstream pressure holds it closed. Upstream pressure opens it. The one on the left has a drain to tank. The one on the right has both a spring and dowstream pilot to close it.

Ted

RE: Hydraulic symbols

hello

The secound one looks IS a non adjustable direct acting relief valve. The sun site mentioned above is one of the best for symbols and descriptions.

The first one would take some checking. Could be a type of pressure reducing, but it may be missing the arrow

See below for more symbols then you may care to know

https://www.sunhydraulics.com/models/cartridges/pr...


No guessing here on the second symbol, it is what it is.

Note: that a Pilot operated valve Can use the process pressure from the #2 line, which may not be considered external. See the sun link for various examples.




RE: Hydraulic symbols

3
First of all, questions like this can never be answered properly when the valves are cut out of context.
This is also a typical "student question" from someone trying to "learn" and a lot of answers are coming from people are "guessing" which of course creates a debate.
Any valve out of context can be analyzed differently because we all have different experiences. from symbol applications.

Another problem is that there is no exact 100% commonly used standard of symbol drawings and neither there is a 100% commonly used standard of interpreting and putting symbols into system context.

Neither one of these two valves can be considered "pilot operated" since there is no external pressure signal line involved in the symbols.

The valve to the left needs more "context" and the origin of the source. As drawn I have never seen it before. The valve to the right is as I interpret it drawn as a pressure relief valve. The control line from spring side to the B port is a drain function.


Pressure relief valves are NORMALLY CLOSED and drain to the tank.
Pressure reducing valves are NORMALLY OPEN and supply a downstream part of the system with lower and reduced pressure. As an example, the pilot lever control system in an excavator.

RE: Hydraulic symbols

hello every one

what this hydraulic symbol means?I confused about it,please help me.
I highlighted that.

RE: Hydraulic symbols

mostafa2932
What's the rest of the "context" around the valve?

RE: Hydraulic symbols

Hello
The symbol on the right is a two way valve. Normally open. Solenoid operated to Close the flow.
The other symbols do not look like they belong there, maybe a drafting error.

RE: Hydraulic symbols

Looks like it could be part of a pump control (possibly torque limiter).

The directional spool is mechanically operated inside a sleeve which is pilot pressure positioned between two adjustable maximum stops.

Agree that the rest of the circuitry is required to see the context.

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

White Paper - Considerations for choosing a 3D printing technology
The adoption of 3D printing into major companies’ product development life cycles is a testament to the technology’s incredible benefits to consumers, designers, engineers and manufacturers. While traditional production methods have limitations in manufacturability, 3D printing provides unparalleled design freedom due to the additive method of building parts layer by layer. 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