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What Does CWP Mean on A Ball Valve? CWP on Ball Valve Explained


Ball valves come with different markings to show their ratings and testing standards, one of them being CWP. This article explains the use of CWP on ball valve markings: what it standard, the different options for the marking, and more. In other words, you’ll learn everything there’s to know about ball valve CWP. But first, here’s a brief introduction to this valve type.

Ball Valve Meaning

Just as its name seems to suggest, the ball valve is a type of valve that uses a hollow ball to regulate the flow of liquid or gas. The ball connects to a handle via the valve stem. When turned, the handle rotates the ball, aligning its hollow part to either open or close the valve.

Ball valves are used almost anywhere, from the plumbing of homes to the heavy duty industrial valve used in oil and gas pipelines. These valves offer several benefits, the most important being:

  • Reliable operation
  • Usage with different types of materials or media
  • Excellent shut off capabilities that make them leak proof

Because application and usage conditions are different, ball valves have various markings on them. These allow buyers to tell what valve will best suit their need. In this article, we will concern ourselves with the use of CWP on ball valves, what it means, and everything else about it.

Brass ball valves and their markings
Brass ball valves and their markings

What Does CWP Mean on A Ball Valve?

Based on the application, a ball valve may have the initials CWP on it. Before we can look at what the use of CWP on ball valve is, it’s important that you understand what it means when used on valves in general. And while at it, understand what other ratings there are apart from ball valve CWP.

Valve CWP

What does CWP stand for on a valve? Starting with the CWP valve meaning, here is what it is: CWP is Cold Working Pressure in full. When used on a valve, it denotes the highest rated working pressure for a given temperature range.

The CWP ball valve temperature ranges from -20°F and 100°F, or when converted to degrees Celsius, between -29°C and 38°C. Different ratings fit different application levels: a higher number means a valve that you can use in more demanding situations and the other way round.

CWP Valve Ratings

In the valves world, pressure and temperature go hand in hand. So a valve will normally be rated for the maximum pressure that it can handle at specified temperature levels. This is this CWP rating and that is normally stamped on the body of the valve.

The CWP marking, when used on a valve, is always accompanied by a numerical figure. This figure indicates the allowed maximum pressure in Pascal. So we have a 600 CWP valve rating as one of them most common, 1000 CWP valve for higher pressures, and so on.

Ball valve WOG marking
Ball valve WOG marking

CWP on Ball Valve

It’s not uncommon to find the initials CWP on ball valve bodies alongside other markings. As we have seen, this is an important value that shows the conditions that the valve may be used in. So what does it mean?

What Does CWP Stand for On a Ball Valve?

As we have already seen, CWP on ball valve stand for Cold Working Pressure, just like when used on other type of valves. It tells you the amount if pressure that the valve can withstand and the temperature range that define the pressure rating.

This is important when selecting the right pipe fittings for different applications. It ensures you’re getting a valve that’s correctly rated for the amount of pressure in the installation.

Ball Valve CWP

Ball valve CWP is used when selecting the type of valve to use in specified applications. So it’s important that the rating is suited for the pressure and temperature level. For instance, you cannot use a 1000 ball valve CWP on a line that has media flowing at a pressure above 2000.

In addition to ball valve CWP, other crucial markings that you may want to know about include PSI, WSP, and gas ratings.

  • PSI – The maximum pressure, in PSI or Pascal per square inch, that the valve is built for (1 bar translates to 14.5038 PSI).
  • WSP – This stands for Working Steam Pressure in full. Used to denote the highest steam pressure that you can use the valve in. It’s mostly used on bronze valves whose ability to withstand pressure goes down as the temperature increases.
  • Gas Ratings – used on gas ball valves and is normally different for indoor or outdoor applications.

You may also read these markings on a ball valve: valve size, marking standard, and type of material used to make it. Each marking is meant to make valve selection easier and more accurate.

Brass automated ball valve
Brass automated ball valve

Ball Valve CWP Ratings

Depending on the line pressure levels, you can choose from the many different options for ball valve CWP ratings. A common choice is the 600-CWP ball valve that’s made from brass. This valve fits a broad range of normal applications, such as water and plumbing lines.

Higher ratings are also available for more demanding installations or lines that carry media at higher pressures. Examples include the following:

  • 1000 CWP ball valve
  • 2000 CWP ball valve
  • 3000 CWP ball valve

Note that there are just examples. The exact rating that you need will depend on several factors such as line pressure, ambient temperatures, and more. So it’s important to ensure that you’re taking every factor that may affect the required CWP value into account.


CWP on ball valves signifies the pressure ratings for specified temperature levels, typically between -20°F and 100°F. Depending in your usage needs, it’s important that you get the correct type of valve for your project. Ball valves are reliable media control products, but only if rated correctly, and that includes the CPW rating, among others.

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