Check valves | How do they work & Selection guide | Tameson

In this video, Max explains check valves and how they work.
Visit our website for more information or to buy a check valve ► https://tameson.com/valves/check-valv...
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Timecodes:
00:00​ - Intro
00:23​ - How do they work?
01:17​ - Selection guide
02:08​ - Most frequently asked questions
02:42​ - Outro
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In this video, we’ll discuss how check-valves work, give you a selection guide and give answers to the most frequently asked questions. Let's get into it.

A check valve is used to allow liquids or gases to flow in only one direction and not backward. Check valves work automatically and in most versions, a spring closes the valve and is forced open again by the pressure of the medium flow from the correct direction.

The most popular type of check valves are the spring-loaded inline check valves. These have a simple design. In the valve a disc is connected to a spring, when the liquid pressure is high enough, the spring is compressed so that the valve opens, the liquid can then flow through. When the pressure decreases, the spring pushes the disc against the opening and the liquid flow is shut off. There are many other types of check valves that all work on a similar principle. If media flows in the backward direction, it also closes the opening. Read the technical article on check valves on tameson.com for more information on the different types.

When selecting a check valve, it is important to consider the following criteria:

1. The material, the valves are available in brass, stainless steel PVC or Polypropylene. Brass is suitable for most media but is not resistant to corrosive substances or saltwater. Stainless steel is more suitable for these types of media and is also the right choice for heated liquid flows. PVC and PP fall right in between, they are suitable for most corrosive liquid flows but have a relatively narrow temperature range.

2. The opening pressure. Because there is a spring in the check valves, the fluid flow must provide enough pressure to open it.

3. The direction of flow. It is important to install the valve in the correct flow direction and make sure the connections are correct for your system.

We are often asked how you can prevent back-flow. The answer is to choose a quick-closing check valve. These then close quickly enough to prevent any form of counterflow. Another question is what the difference is between an inline and a y-shape check valve. The main difference is in the flow characteristics. With a y-shape-check valve, the disc that shuts off the flow is completely removed from the opening when open, with an in-line check valve this is not the case. As a result, a y-check valve will cause less turbulence in the liquid flow.

If you enjoyed this video please give it a like and subscribe for more. For questions about check valves, please contact me or someone else from Tameson!
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