Valve Common Problems

SKU: C-421Duration: 31 Minutes Certificate Included

Pay-per-view (PPV) format perfect for individual users.

Get immediate access to this interactive eLearning course online. Must be used within 30 days, expires 48 hours after launch.

Great for in-person classroom training or as an alternative to DVD.

Includes printable documents and Convergence Video Player for Windows systems. Content expires after 1 year.

Ideal for corporate licensing and volume users who also need administrative tracking and reporting on training.

Get this interactive eLearning course into your LMS or learn how you can leverage our LMS to deliver training to your workforce.

Need multiple courses or have lots of users? Just let us know a little more about what you need and we’ll get you some great volume pricing.

 Need help deciding? Compare delivery formats.

Course Details

Specs

Training Time: 31 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Valves are critical in many workplaces, and so it's important to know how to avoid, diagnose, and fix common valve-related problems. This course focuses on flashing, cavitation, choked flow, turbulence, and noise, explaining the causes of each and providing possible solutions.

Learning Objectives

At the end of this module, you will be able to:

  • Describe pressure drop and the problems associated with pressure drop
  • Describe flashing and solutions for flashing
  • Describe cavitation and the negative effects of cavitation
  • Define "choked flow"
  • Explain how turbulence can occur and ways to reduce turbulence and its effects
  • Describe how to eliminate high noise levels in valves and piping systems

Key Questions

The following key questions are answered in this module:

What is pressure drop?
Pressure drop is The pressure when the pressure immediately downstream of the valve is lower than the pressure upstream. This drop in pressure is known as the pressure drop or pressure differential and is often abbreviated as ΔP or dP.

What is flashing?
When a pipeline carries a liquid through a restricted-port valve, and the downstream pressure is low enough, some of the liquid can suddenly turn into a gas. This process is called flashing. When a liquid flashes, the downstream flow could be all gas or a mixture of liquid and gas.

What is cavitation?
Cavitation and flashing begin in a similar manner. When a fluid passes through a restricted-port valve, and the downstream pressure is low enough, flashing occurs. After flashing, the pressure begins to recover. If the pressure increase is high enough, some or all of the bubbles implode. The implosion of vapor bubbles is known as cavitation.

What is choked flow?
In normal circumstances, as the pressure drop through a valve increases, the flow rate through the valve also increases. However, when the pressure drop is high enough, the fluid flow can become "choked." Choked flow is when the flow rate of a fluid can no longer increase regardless of how much the downstream pressure is decreased.

What can cause turbulence to occur?
Fluid moving through piping and valves at a very high speed creates a greater likelihood for turbulence, vibration, and noise to occur.

Sample Video Transcript

Below is a transcript of the video sample provided for this module:

Cavitation and flashing begin in a similar manner. When a fluid passes through a restricted port valve and the downstream pressure is low enough, flashing occurs. After flashing, the pressure begins to recover. If the pressure increases high enough, some or all of the bubbles implode. The implosion of vapor bubbles is known as cavitation. It is often possible to hear cavitation in a system. The early stages of cavitation create a cracking or popping noise or may sound like rocks flowing down the pipe. Later stages may create a steady sizzling or hissing sound.

Customer Q&A

Ask a Question

Sorry, we're missing some information

I would like to have several employees take multiple courses. How can I set that up?

We're in the process of making bulk course and multiple user purchases easier. But for now, you can order multiple courses and contact us with details on who you'd like to assign courses to. We can set up each user's training plan and make sure everyone gets the eLearning assignments they need.

Can I get a free full-length preview of a course to see what this course covers?

While we do our best to offer details on course contents, we don't normally offer full-length previews. But please contact us with more details for a better understanding of what your organizaton needs and how we can help.

Do I get a certificate when I complete a course?

Yes. All of our courses allow you to print a completion certficate upon successfully passing the integrated test at the end of each eLearning course.

How do I log in to take a course that I have already paid for?

You'll receive an email with login details moments after you purchase your pay-per-view (PPV) course. Just click the login link and enter the user name and password provieded.

Do you have courses in different languages?

Yes. While all of our courses are originally produced in English, we develop many courses in a growing number of languages, including Chinese, Dutch, German, Italian, Japanese, Korean, Polish, Portuguese, Russian, Spanish, Tamil, and Thai. Availabl languages are normally displayed in the Course Details section on each course page.
Added to Cart! Click here to view your cart.