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!

*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.

Jobs

Packed lever vs Open Lever

Packed lever vs Open Lever

(OP)
I have a relief valve in nitrogen service (line provides a N2 pad to a tank).
what is the difference between a Packed Lever and a Open Lever relief valve? Would that make any difference in my service?
Thanks in advance!

RE: Packed lever vs Open Lever

An Open Lever, also called a Regular Lever, is used for non toxic gases. It is normally used on conventional SRV's and hence open to atmosphere. When the valve opens, fluid escapes via the cap. A Packed Lever is a "gas tight" lever design used for liquids, toxic fluids or when a superimposed back pressure is present in conventional design SRV's (a bellows would shield the cap).

There can be a noticeable difference commercially between the 2.

ASME VIII "UV/NB" Code Stamped SRV's require a lever as a mandatory requirement when the fluid is air, steam or water above 140F (Unless specific rules are followed and accepted).

Per ISO, only the term Safety Valve is used regardless of application or design.

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!


Resources

eBook: Product Innovation Platform Assessment
Over the past few years, there has been growing interest among industrial companies and solutions providers with regards to Product Innovation Platforms, where design, manufacturing and IoT tools are bundled into a single software package. 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