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- 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.
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A silent check valve is a type of check valve designed to prevent backflow in a pipeline. Unlike traditional check valves, the silent check valve is specifically engineered to minimize noise and pressure fluctuations, commonly known as water hammer, when the flow direction changes.
Jul 9, 2020 · 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.
Jul 1, 2020 · How? When we think about that same pressure wave that closed the swing check valve, the spring in the spring check closes before the pressure wave gets there. 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 Misunderstood Check Valve
- How They Operate
- What Is The Ideal Check Valve?
- Swing Check
- Piston/Poppet Check
- Flange Insert Check
- Center Guided Check
- Ball Checks
- Selection
- Problem Solving
Like other valves, check valves are used with a variety of media: liquids, air, other gases, steam, condensate, and in some cases liquids with particulate or slurries. Applications include pump and compressor discharge, header lines, vacuum breakers, non-code pressure relief, steam lines, condensate lines, chemical feed pumps, cooling towers, loadi...
Check valves are flow sensitive and rely on the line pressure and flow to open and close. The internal disc allows flow to pass forward, which opens the valve. The disc begins closing the valve as forward flow decreases or is reversed, depending on the design. The function or purpose of a check valve is to prevent reverse flow. Construction is norm...
Regardless of type or style of valve, the longest trouble-free service will come from valves sized for the application, not necessarily the line size. Ideally, the disc is stable against the internal stop in the open position when flowing or fully closed when no flow or checking. When these conditions are met, no chattering of the disc will occur, ...
Swing checks are a simple design using a disc attached to an arm that is hinged at the top of the valve (at the 12 o’clock position). Reverse flow and gravity assist the valve in closing. Swing checks can be used for most media and generally provide good flow capacity. They should only be installed in a horizontal flow position. This is because the...
Piston or poppet style check valves are available as inline, inclined (Y-pattern), or conventional (90 degree T-pattern) body designs. All types are considered a silent check valve style that prevent water hammer and reverse flow. It does this by using a spring-assisted disc in line with the flow that has a short travel distance, resulting in a fas...
Flange insert check valves are an extremely compact, wafer-style check valve for flanged piping. They are commonly used in-line and vary from ½ inch to 20 inches in size. This style is also considered a type of silent check that help prevent water hammer. Accordingly, they will have an internal spring that assists with closing of the valve. The fla...
Center guided check valves are another type of silent check valve. They are also designed to prevent water hammer as well as reverse flow. This style is similar to the piston/poppet. It also falls under MSS SP125 & 126 for specifications. They are available in flanged styles with sizes from 2 to 24 inches and sometimes larger. Similarly, this style...
Ball check valves use a ball inside the body to control the movement of flow. This style is also considered a type of silent check. The ball is free to rotate, resulting in even wear and a wiping action between the ball and seat. This feature makes ball checks useful for viscous media. Ball checks are typically found in smaller sizes of 2 inches an...
Among the many factors to consider when selecting a check valve are material compatibility with the medium, valve pressure rating (ANSI), line size, application data (flow, design/operating conditions), installation (horizontal, flow up, or flow down), end connection, envelope dimensions (especially if replacing an existing valve to avoid pipe modi...
When replacing a check valve, it helps to ask the following simple questions: 1. Why am I replacing this valve? 2. What was the problem? Sometimes we get so busy or absorbed in other things, we forget the cause can help with the solution. Common check valve problems include noise (water hammer), vibration/chattering, reverse flow, sticking, leakage...
Aug 28, 2020 · Written by Anup Kumar Dey in Piping Design Basics. Check valves are essential components in fluid control systems. They play a crucial role in preventing the reverse flow of fluids within pipelines or piping systems. Check valves are popular as non-return valves or one-way valves.
Jun 5, 2023 · Silent check valves have a spring-loaded disc that travels a short distance along the pipe axis to close automatically in a fraction of a second. They are also known as spring check valves or axial flow silent check valves. They are suitable for reducing noise and water hammer when swing check valves close quickly.
Jul 7, 2023 · Introduction. Here is the most complete guide on the internet about. You will learn: What is a Spring Check Valve. What is a Swing Check Valve. How Spring Check Valves Work Compared to Swing Check Valves. Types of Spring Check Valves. Types of Swing Check Valves. How Spring Check Valves and Swing Check Valves Connect to Pipelines. And much more …
