Which is better swing valve or check valve?

Valves are versatile devices used for controlling the flow of liquids or gases. They play an important role in countless piping and process systems, typically serving to regulate flow and pressure, start or stop flow, or prevent the occurrence of back flow within a system. Swing check and spring check valves are two relatively common valve types that have broad applications.

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Swing check valves prevent reverse flow in systems with horizontal forward flow utilizing a swinging flap. Spring check valves also prevent reverse flow, in this case utilizing a spring-loaded plunger. Understanding the differences between these two valves is beneficial in determining the optimal valve for a particular system or application.

Swing Check Valves

In swing check valves, a flapper will swing away to allow forward flow of a fluid or gas. When it is time to stop the flow, the flapper will swing back onto the seat, closing the valve automatically as the system pressure decreases. Swing check valves are notable due to their large flow capacity. Since these devices require a swinging motion to function, their use is limited to horizontal flows or vertical upward flows.

Pros and Cons of Swing Check Valves

The most significant advantage of swing check valves is their low cost, which allows them to work within a wider range of project budgets. They also provide large flow capacity. Since this valve cannot support downward vertical flow, there are limits to the types of systems it can serve. Also of note, swing check valves are also more likely to amplify water hammer.

Applications of Swing Check Valves

Swing check valves function well with a variety of media, including liquids and gases. Some frequent use cases for swing check valves include firefighting equipment, flood prevention in sewage systems, and toilet flush mechanisms.

Spring Check Valves

Spring check valves typically have hollow bodies and a large stopper, which receives constant pressure from a spring. When gas or fluid flows forward at sufficiently high pressure, the force will overcome the pressure from the spring and cause the stopper to open, allowing the desired flow.

Unlike swing check valves, spring check valves offer fairly low noise levels. They also minimize the sound and damaging effects of water hammer. This type of valve functions well in vertical applications, as it utilizes a spring to close the valve rather than relying on gravity and pressure.

Pros and Cons of Spring Check Valves

Since spring check valves are functional in vertical applications, they offer significantly more versatility than swing check valves, and are much more likely to fit with preexisting piping configurations. Depending on the spring selection, this type of valve will work well in virtually any flow orientation.

Spring check valves also offer the advantage of reducing water hammer. Known as a &#;silent check valve,&#; this type of device keeps noise levels down in applications where swing check valves could potentially exacerbate the issue. Other advantages of spring check valves include:

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• Heat and cold resistance
• Rapid flow interruption
• Positive sealing even at a pressures below the cracking pressure

When compared to swing check valves, however, spring check valves are typically more expensive. They also have a lower flow capacity.

Applications of Spring Check Valves

Spring check valves are ideal for numerous purposes in water pipelines and systems. This type of valve serves to protect equipment from the damage that can be caused by back flow, thus reducing the risk of system downtime and potential contamination. Additionally, spring check valves can relieve pressure from the system to create a safer environment and ensure proper system function.

Valve Solutions from RED-WHITE VALVE CORP.

RED-WHITE VALVE CORP. has been providing our customers with industry-leading valve solutions for over 50 years. Our global market includes customers in industries such as HVAC, commercial, and plumbing. We perform all our own manufacturing at our own state-of-the-art facilities, giving us superior control over the quality of our products. We also perform 100% air testing during quality control to verify the efficacy of every valve.

To learn more about our valve solutions and how they will benefit your operation, please contact us today.

Swing check valves are by far the most common type of check valve in any industry. Typically, they have a lower up front cost, but are also limited in their application and instillation options vs spring check valves. When in use, it&#;s important to understand the differences between these types of check valves. In this article, we&#;ll cover some basic differences between these two types of inline check valves. We well also cover the advantages and disadvantages of each.

1. One difference between these types of check valves is how they allow and prevent flow. A swing check valve uses a flapper that &#;swings&#; off the seat to allow forward flow and then swings back onto the seat when the flow is stopped. In contrast, a spring loaded check valve incorporates a spring to assist in closing the valve. Learn more about spring check valves!

2. Swing check valves are limited in the orientation in which they can be installed. These type of check valves can only be installed in horizontal flow applications, which greatly limits the applications where they can be used. While swing check valves do offer a larger flow capacity, they may not always fit in existing piping configurations. On the other hand, spring loaded check valves can be mounted in any flow orientation with the right spring selection. In you need a check valve for a process skid, a difficult space with challenging dimensions, or even unique direction of piping, choosing a spring check valve with the proper spring setting (spring cracking pressure) provides more possibilities for finding the right solution for your specific flow control application.

3. Any water hammering effects present in a piping system can potentially be amplified by a swing check valve. Installing a spring loaded check valve can prevent effects of water hammer; whereas a swing check valve can exacerbate the issue. Spring check valves are considered &#;silent check valves&#; by utilizing a spring to assist the poppet in closing the check valve prior to fluid flow reversal. The following is a basic example to explain the concept of water hammer.

Consider an application where you have a process line with water in it. For flow control you have a check valve and downstream of that check valve you have a lever handle quarter turn ball valve. Let&#;s say water is flowing and someone shuts the quarter turn ball valve abruptly. This can produce a pressure wave flowing through the piping &#; this is what is known as water hammer. With a swing check valve specifically, the flapper on that valve will be open until that pressure wave returns back to the swing check. The pressure wave can cause the flapper to slam shut, both of which can contribute to inducing water hammer. Conversely, a spring loaded check valve will help minimize, and in some cases, eliminate the effects of water hammer because the spring in the spring check closes before the pressure wave gets there.

We hope this clears up any confusion you may have around the differences between these different type of check valves and that you learned the advantages offered by spring check valves. All the valves Check-All Valve manufactures are inline spring loaded poppet style check valves. Our expert staff can answer any questions you may have. Use the comments to post your questions or tag us on social media. Stay tuned for our next article!

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