What is the advantage of check valve?

Water valves are important for controlling the flow of water in a system. One specific type of valve, called a check valve, has a special job: it lets water flow in one direction but stops it from flowing backward.

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Check valves play a vital role in plumbing and maintaining water systems. In this article, we will explore the functions of a check valve, explain its importance and provide insight into the different types of check valves available on the market.

 

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What is a Check Valve?

 

A check valve, also known as a non-return valve or one-way valve, allows the fluid to flow in only one direction. It is designed to prevent backflow, the reverse flow of fluids in a pipeline, and ensure the unidirectional fluid flow in the piping system.

 

The history of check valves dates back to ancient times when they were used to control water flow in irrigation systems. Over time, check valves have become more sophisticated, and today, they are used in various industries, including oil and gas, chemical, water treatment, and HVAC systems.

 

How Do Check Valves Work?

 

Check valves use a simple mechanism to allow fluid to flow in one direction while preventing backflow. They consist of a valve body, a seat, and a disc or ball that closes the valve opening when fluid flow reverses. When fluid flows in the forward direction, the disc or ball moves away from the seat, allowing the fluid to pass through; meanwhile, when the fluid flow reverses, the disc or ball returns to its seat, blocking the flow and preventing backflow.

 

Types of Check Valves

 

Check valves come in different types, each with its unique design and application, as well as advantages and disadvantages. However, some of the most common types of check valves include:

 

• Ball check valves:

  These valves use a ball that sits on a seat to allow fluid to flow in one direction but prevent backflow when the fluid flows in the opposite direction.

• Inline check valves (Globe-Style Sliding Disc Check Valve):

  These valves are installed within the piping system and use a spring-loaded disc to allow fluid to flow in one direction and prevent backflow when fluid flows in the opposite direction.

• Swing check valves (Butterfly Check Valve) :

  These valves use a swinging disc to allow fluid to flow in one direction and prevent backflow when fluid flows in the opposite direction.

• Lift check valves:

  These valves use a piston or ball to lift off the seat, allowing fluid to flow in one direction but preventing backflow when the fluid flows in the opposite direction.

• Tilting disc check valves:

  These valves use a tilting disc to allow fluid to flow in one direction and prevent backflow when fluid flows in the opposite direction.

• Wafer check valves:

  These valves are installed between flanges and use a spring-loaded disc to allow fluid to flow in one direction and prevent backflow when fluid flows in the opposite direction.

 

What Are the Functions of a Check Valve?

 

Check valves are used in a wide range of applications, including water treatment plants, chemical processing, oil and gas production, food and beverage processing, and HVAC systems. Here are the key functions of a check valve that make it an integral components in many industries:

 

• Prevents Backflow:

  The primary function of a check valve is to prevent the backflow of fluids in a piping system. It ensures that the flow of fluid occurs in one direction only, effectively blocking reverse flow. This is especially important in situations where backflow could cause damage, contamination, or interference with the intended flow direction.

• Protects Equipment and Systems:

  Check valves help safeguard equipment and systems by preventing potential damage caused by reverse flow. They act as a barrier, preventing fluids from flowing back and causing issues such as pump damage, pipe collapse, water hammer, or contamination of sensitive components.

• Maintains Pressure:

  Check valves assist in maintaining optimal pressure levels within a system. By allowing fluid to flow in the desired direction and preventing backflow, they help maintain the desired pressure conditions, ensuring efficient operation of pumps, regulators, and other pressure-sensitive equipment.

• Enhances System Efficiency:

  Check valves contribute to the overall efficiency of a system. By preventing reverse flow, they eliminate the need for additional pumps or mechanisms to counteract backflow, thereby reducing energy consumption and operational costs.

• Minimizes Water Hammer:

  Water hammer

  , characterized by sudden pressure surges or shockwaves in a system, can lead to pipe damage and system failure. Check valves help mitigate water hammer by preventing reverse flow and the subsequent pressure spikes that can occur.

• Allows for System Isolation and Maintenance:

  Check valves provide a means of isolating sections of a system for maintenance or repairs. By closing off the valve, the flow of fluids can be stopped in a specific direction, allowing for safe and efficient maintenance procedures.

 

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What To Consider When Selecting a Check Valve

 

Several factors should be considered when selecting a check valve for a specific application. Here are some of the key considerations:

 

Flow Rate and Pressure Drop Considerations

 

One of the primary things to consider when selecting a check valve is the flow rate and pressure drop of the fluid. The type of check valve selected should be able to handle the anticipated flow rate and pressure drop while minimizing head loss.

 

Material Selection Considerations

 

The material of the check valve is also an important factor, as it affects the compatibility of the valve with the fluid being transported. In addition, different materials have different chemical resistance and durability properties, and the selected material should be able to withstand the specific environment and conditions of the application.

 

Temperature and Pressure Limitations

 

Check valves also have specific temperature and pressure limitations that must be considered when selecting a valve. The valve should be able to withstand the maximum temperature and pressure of the fluid without failure or damage.

 

Installation, Maintenance, and Cost Considerations

 

Finally, when choosing a check valve, it’s important to account for the initial purchase cost, assembly expenses, maintenance fees, and ongoing running costs. Cost is typically a significant factor, following quality and functionality. While low purchase prices may seem attractive, they can result in high maintenance and running expenses. Also, a low-cost check valve that fails to perform its intended function can cause serious issues at a pumping station.

 

Check valves must be installed properly to ensure optimal performance and prevent failure. Certain types of check valves may require expensive modifications to the pipeline, which can increase assembly costs. Maintenance and repair expenses also tend to rise as the valve’s complexity increases. In some cases, complex solutions may necessitate the assistance of a professional.

 

Streamline Your System With Av-Tek Valves: The Solution for Efficient Flow Control

 

Check valves play a vital role in maintaining the efficiency and safety of fluid systems. By preventing backflow, protecting equipment, and maintaining pressure, these valves ensure the smooth operation of various industries, including water treatment, chemical processing, oil and gas production, and HVAC systems. Choosing the right check valve for your specific needs requires considering factors such as flow rate, pressure drop, material selection, and maintenance requirements.

 

Remember, a properly selected and well-maintained check valve can significantly enhance the performance and longevity of your fluid systems. Choose Av-Tek Valves and streamline your flow control with confidence, knowing you have a trusted solution for efficient and hassle-free operations.

Av-Tek Valves offers top-quality check valves, including sliding disc check valves and flanged ball check valves. Our products are designed to meet your needs in terms of lead time, quality, and easy maintenance. So if you are looking for a reliable and efficient check valve for your water system, contact us today or call (385) 325-2504 or (801) 637-8541 for more information.

Authors: Mike Lassas, President, Proco Products Inc, and Cal Hayes, General Manager, WaterWorks Division

When you design check valves into your piping system, you are making an investment in preventative maintenance. Check valves support savings from both production downtime and equipment damage, such as when a valve leaks back into a pump cavity or sumps or when there is a pressure surge and there is a reversal of flow. If there is a pressure surge or the flow reverses in your pumping system, this creates a risk of damage to an integral part of the system. For example, when a flow reverses near the discharge end of a pump, it can cause the pump rotor to rotate the opposite direction, and this may cause damage to the internals of that pump.

The introduction of a correctly specified check valve avoids repairing or replacing a pump and the production time lost in correcting the issue.

A check valve can offer more than just ensuring positive sealing; some check valves are specifically designed to address valve slam. Valve slam is an industry-wide problem for water and wastewater facilities and happens when the pumped liquid flows back to the check valve after a pump shuts off. When this occurs, the check valve will slam, making a loud “bang” sound. In a plant with only a few check valves, valve slam is potentially tolerable; but when you have a few hundred check valves in a larger, more complex piping system, the noise can not only be very hard on the ears of the operations personnel, it can also break flanges and swing gates in some mechanical check valve designs.

The solution is the rubber duckbill check valve which is designed as an alternative to traditional swing gate, inline check valve and flap gate type check valves. The unique benefit of a rubber duck bill check valve over a typical lever operated or hydraulically dampened check valve is that it is made of a flexible material that can dampen the effect of when the pump shuts off and the energy flowing upstream comes back toward the pump. The rubber duckbill check valve is able to deflect or take up the energy within the body of the valve, thereby eliminating valve slam and preventing water hammer, which in some cases will damage pipe supports and over time cause ruptures in the piping system.

Rubber duckbill check valves are highly recommended for water and wastewater systems. As the flow of water or flow of sewage is moving through the valve, the flow encourages the lips of the valve to open, allowing the pumped material to flow out to either an ocean outfall, into a ditch or into a waterway.

With a flange configuration, this type of in-line check valve is made out of carbon steel or stainless steel and has flush ports on both the top and bottom of the valve, which allows maintenance crews to flush the valve in case there are instances of plugging or obstructions – basically eliminating the need to dismantle swing gate type check valves – thereby reducing maintenance.

In summary, check valves and, rubber check valves in particular, offer advantages in preventative maintenance and supporting production up time:

• Preventing backflow: Check valves are designed to allow fluid to flow in only one direction, preventing it from flowing back when the pressure drops or the pump is turned off. This helps to protect the system from contamination and damage.
• Protecting pumps: Check valves can help to protect pumps from damage by preventing backflow when they are turned off.
• Reducing water hammer: Water hammer is a sudden pressure surge that can occur when the flow of water is stopped abruptly. Check valves help to reduce water hammer by preventing the flow of water from reversing direction.
• Improving energy efficiency: Check valves improve energy efficiency by preventing water from flowing back to the pump, which would require the pump to work harder to maintain the desired flow rate.
• Reducing maintenance costs: Rubber check valves are simple devices reduce overall maintenance for water and wastewater systems.

You can find out more about how Proco Products preventive maintenance plant surveys prevent downtime, plant failures, and save costs.

Watch a video of Cal Hayes, Proco Products General Manager discussing the Proco ProFlex 750 In-Line Flanged Rubber check valve which is designed to tackle many of the challenges caused by valve slam.

For more information on check valves from Proco Products, Inc., please contact us.

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