In this post, we will discuss the difference between two return valves of interest: a check valve and a non-return valve. These are two critical valves used commonly in some very importable applications.

A non-return valve lets the fluid flow in one direction. As the name implies, the primary function of a non-return valve is to keep the flow of fluid in just one direction. When fluid in the line reverses direction and begins to flow back the way it came, a check valve serves to stop or prevent the backflow by allowing flow in one direction. The check valves are primarily designed for pressure applications.

Check valves

Check valves are quite ubiquitous in their applications, in that they are found in almost every industrial application, where they act as one-way or non-return valves. Check valves are simple devices in their design. They help to execute an important function in fluid control. Check valves prevent reverse flows, therefore preventing damage and ensuring efficient operations.

When reverse water flow occurs, the phenomenon can result in a water hammer. High-pressure surges often follow this phenomenon in the existing pipework, valves, and pumps. It may result in severe damage or rupturing of the system, along with the pipework. Sometimes, the system may not break down immediately; the reverse flow of water could also lead to a gradual build-up of fatigue and the repeated impact of the water hammer, which might ultimately result in a loss of system integrity.

Properties and application

Check valves are two-port valves; hence, they have two openings; one for fluid to enter and the other for fluid to leave. Check valves have a single inlet and outlet. They are operated by a pressure differential. Above a certain upstream pressure, the check valve automatically opens without requiring any other intervention. The minimum operating pressure is a significant characteristic that describes all check valves. This pressure is known as the cracking pressure.

Check valves are used in many pumping applications and fluid flow. Examples include chemical processing, pulp and paper, food processing, water, and wastewater treatment, industrial, marine, and mining, pumps, pipelines, power generation, and HVAC. These are only a few of the many applications of check valves.

Non-return valve

Non-return valves are very important because they function in a unique style. They are an essential feature that helps in a typical retention system to prevent the return of water or reflux that may occur due to pressure loss or a reduction in the supply and flow of water. This helps to provide more excellent safety and precision for thermostatic tapware.

Non-return valves are unidirectional, allowing water to flow in just one direction. They are opened by the force of the liquid moving in one direction, and they close due to the effect of the gravity of the water trying to return in the opposite direction (counter-flow). The action of spring helps to close the valve.

Essentially, a non-return valve allows fluid flow in only one direction. The valve is designed and fitted to ensure that the fluid flowing through the pipe follows the right direction, especially in cases where pressure conditions can cause reversed flow. When the fluid flows through the non-return valve, it causes a reasonable pressure drop in the system. Typically, the design of the valve takes this into account when designing the device.

Properties and applications

They are two-port valves with two openings in the body; one for fluid to go in, while the other is for fluid to leave. Non-return valves are typical of different types. Common variants include the

• Spring-loaded
• Swing
• Clapper
• Swing check valves.
• Flap check valves
• Duckbill
• Dual Disc check valves
• Tilted Disc check valves
• Silent check
• Ball

Non-return valves are used in many different applications. For instance, non-return valves are applied extensively in mixing loops in heating and cooling systems to ensure proper operation, and with domestic water systems to prevent backflow.

What is the difference between a non-return valve and a check valve?

We’ve established that both valves are essential and that perform similar functions. In a nutshell, the design of a non-return valve allows it to prevent the backflow or reverse flow of a medium or fluid, and to protect the pump in question from getting damaged due to surge pressures of water hammer following pump shut-down.

The check valve, on the other hand, also known as a one-way valve, is a valve that allows fluid to flow through it in only one direction. To do more or order check and non-return valves for your industrial processes, feel free to contact us today at Adamant Valves.

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Sanitary check valves are a kind of valve that relies on the flow of the medium to automatically open and close the valve flap to prevent the backflow of the medium. It is also known as a single direction valve, counterflow valve, and back pressure valve.

What are check valves used for

This type of check valve works automatically. Under the fluid pressure flowing in one direction, the valve flap opens. When the fluid flows in the opposite direction, the valve seat is affected by the fluid pressure and self-overlaying valve flap, so that the flow is cut off.

What are check valves used for?

A Sanitary check valve is a kind of automatic valve mainly used to prevent the backflow of the fluid medium, prevent the pump and actuating motor from reverse-rotating, and prevent the discharge of the container medium.

Check valves can also be used in pipelines supplying an auxiliary system where the pressure may exceed the system’s rated pressure. Check valves can be divided into swing-type check valves (which rotate around the center of gravity) and lift-type check valves (which move along the axis).

Another key feature of sanitary check valves is in the name. Their sanitary properties allow use in highly hygienic applications demanded by various industries like food, bio-fermentation, and pharmaceuticals.

How to pressure test a check valve

The valve flap axis of the lift-type check valve is in a position vertical to the horizontal surface. The channel axis and valve flap axis of the swing-type check valve are in a position nearly parallel to the horizontal line.

To conduct a strength test, introduce the test medium from the inlet to the specified value, with the opposite end closed. If there is no leakage from the valve body and cover, then it’s considered qualified.

To conduct a sealing test, introduce the test medium from the outlet. At the inlet, check the sealing surface, stuffing, and gasket. If there is no leakage from those places, then it’s considered qualified.

Conclusion

Adamant Check Valves are subject to MSS SP-61, an ANSI standard that institutes the requirements and acceptance criteria for shell and seat closure pressure testing. Proper pressure testing is conducted through various methods, which we will explore down below. One of our main goals is to prevent check valve failures before they occur—that’s why each sanitary check valve produced by Adamant Valves is thoroughly pressured and leak tested before being delivered.

Seat Test with Air

Check Valves are tested at an air pressure of no less than 80 psi.

Shell Test

Valves are tested at a gauge pressure no less than 1 ½ times the 100º F rating, rounded to the next highest 25 psi increment.

Seat Test with Water

Valves are tested at a pressure no less than 1.1 times the 100º F rating. The test medium is water.

Results:

The goal of each check valve pressure test is no observable leakage.

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A check valve is a non-return valve or a one-way valve designed to prevent backflow. Sanitary check valves are designed for use in applications requiring clean or sterile processing. They are often used in clean water systems as a safeguard against backflow contamination.

Double check valves usually consist of two check valves that are interlinked in case one fails. A double check valve or double check assembly (DCA) is a backflow preventer designed to protect water sources from contamination. It is also a valve used in compressed air braking systems on heavy trucks.

How Does a Check Valve Work?

The structure of a check valve is usually very simple, including parts such as a valve body, a valve seat, a valve disc, and a cover. The working principle of the check valve is to allow one-way flow and automatically prevent reverse flow. This type of valve is sensitive to flow and relies on the medium to open and close the valve seat. The inner disc allows the medium to flow forward, thereby forcing the valve to open. Once the flow reverses, the valve reverses automatically. The check valve is one of the few fully automated valves that can be circulated without manual intervention. So, now that you understand how check valves work, we can learn more about how double check valves work!

What is the Difference Between A Single and Double Check Valve?

The main difference between a single check valve and a double check valve is that double check valves provide extra security — if one of the check valves fails, the other valve will still be able to save the system from backflow contamination. Single check valves provide category 2 fluid protection, guarding against fluctuations in temperature, taste, or smell. A double check valve is for category 3 fluid protection protecting against contamination from low-toxicity chemicals like household cleaners.

Sanitary Double Check Valve Operation

spring loaded double check valve operation

sanitary double check valve application

What is the function of the double check valve?

Double check valves consist of two non-return valves connected in a series, operating under these two principles: 

1) Firstly, one check valve will still act, even if the other is jammed wide open.

2) Secondly, the closure of one valve reduces the pressure differential across the other, allowing a more reliable seal and avoiding even minor leakage.

Sanitary Double Check Valve Application

The small valves can be hard to notice, especially when integrated into existing valve bodies. Larger check valves may be installed with end ball valves for insulation and testing. Often, test valves are in place to attach the test equipment to assess whether the double check assembly is still functional. 

Where are Double Check Valves Used?

The double check valve is suitable for the prevention of back pressure and siphoning, but is not suitable for high risk applications. It is commonly used on lawn irrigation systems, fire sprinklers and mixed boilers. If the hazard is higher, even a relatively low risk such as the use of antifreeze in the fire sprinkler system, a more reliable sanitary check valve such as a reduced pressure zone device may be mandatory.

Conclusion

Thank you for reading our article and we hope it can help you better understand the operation and applications of double check valves. If you want to learn more about sanitary valves, we would like to advise you to visit the Adamant Valves homepage for more information.

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A check valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. Sometimes called a “one-way valve” or “non-return valve,” check valves are primarily designed to prevent backflow by using the force of the medium’s flow to automatically engage and disengage the stopping mechanism. It is a type of two-port valve. In other words, it has two openings in the body, one for fluid to enter and the other for fluid to leave. Check valves are usually relatively small valves with a simple and cost-effective design. They open and close automatically — most are not controlled by a person or any external controls (there are some exceptions). Accordingly, most do not have a valve handle or stem. The bodies (external shells) of most check valves are made of plastic or metal. Still, check valves are available in other construction materials. In some industries which have high requirements on the cleanliness of the fluid medium, sanitary check valves are preferred.

What Is a Sanitary Check Valve?

Sanitary check valves prevent pipeline backflow contamination in manufacturing processes with high hygiene standards. The main difference between sanitary check valves and ordinary check valves are the design and materials. Sanitary valves are designed for use in applications requiring clean or sterile processing. They are commonly used in dairy, food, pharmaceutical, medical, and chemical applications. Their common features include easy cleaning, crevice-free, and polished contact surfaces. The part of the valve in contact with the medium is usually made of 304SS or 316 stainless steel, which is non-toxic and corrosion-resistant.

How Do Sanitary Check Valves Work?

How a Check Valve Works

The structure of a check valve is usually very simple, including parts such as a valve body, a valve seat, a valve disc, and a cover. The working principle of the check valve is to allow one-way flow and automatically prevent reverse flow. This type of valve is sensitive to flow and relies on the medium to open and close the valve seat. The inner disc allows the medium to flow forward, thereby forcing the valve to open. Then the flow reverses and the valve is closed. The check valve is one of the few fully automated valves that can be circulated automatically without manual intervention.

What Are the Two Types of Check Valves?

The two most common types of check valves are swing check valves and lift check valves. The swing check valve has a hinge mechanism and a door-like disc. In order to ensure the valve clack can reach the proper position of the valve seat surface every time, the valve clack is designed in a hinge mechanism so that the valve clack has enough space for rotation and makes the valve clack truly and comprehensively contact the valve seat. The valve clack can be made of metal, or inlaid with leather, rubber, or synthetic covering, depending on the performance requirements. When the swing check valve is fully opened, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. 

The valve disc of the lift check valve is located on the sealing surface of the valve seat on the valve body. Aside from the manually-operated disc, the rest of this valve is like a shut-off valve. The fluid pressure lifts the disc from the seat sealing surface, and the backflow of the medium causes the disc to fall back onto the seat and cut off the flow. According to the conditions of use, the valve disc can be an all-metal structure, or it can be in the form of inlaid rubber pads or rubber rings on the disc holder.Like a shut-off valve, the passage of fluid through a lift check valve is also narrow. Therefore, the pressure drop through the lift check valve is larger than that of the swing check valve, and the flow rate of the swing check valve is less restricted.

Thank you for reading this article and we hope it can help you to better understand how a sanitary check valve works. If you want to learn more about valves, we would like to advise you to visit Adamant Valves homepage for more information.

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A sanitary check valve is a kind of sanitary valve that can automatically open and close without the need for human power or other operations. It relies on the flow of the pipeline medium to open or close. It’s mainly used to prevent the reverse flow of the pipeline medium, so it’s also called a counterflow valve.

There’s only one flow direction for a check valve, which is along the flow direction from the inlet, and the valve gate will close when the medium flows backward.

Check valves are usually installed in places where the medium flows backward when the valve is not closed. At the outlets of common water pumps, check valves are usually installed to prevent the backflow of high-pressure water into pumps, damaging the pump impellers or other parts, leading to accidents. In sum, check valves are used in most pipelines or equipment to prevent the backflow of the medium.

The mechanism of check valves:

The medium flows in the specified direction, when the flow pressure exceeds the opening pressure of the check valve, the valve gate will be pushed away under the pressure of the fluid, connecting the circulation of the pipeline medium. Conversely, when the pipeline medium flows backward, under the force of pressure of the fluid, the valve gate will be pressed onto the valve body of the check valve, shutting down the valve, therefore cutting the circulation of the pipeline medium. And the greater the pressure of the backflow medium, the more tightly closed the valve gate is, hence the better-sealing effect, completely excluding the possibility of the backflow of the medium.

Based on different structures, check valves can be divided into three types: lift, swing, and butterfly.

Lift types can be further divided into two types: vertical and horizontal.

The movement of lift type is along the axis. Swing type can be further divided into three types: single-lobe, double-lobe, and multi-lobe. The movement of the swing type is rotation with the force of gravity center. Thin butterfly type is through the flow channel, relies on the spring on the hinge to press on the valve seat to seal.

What is the purpose of a check valve in a hydraulic system?

Check valves are the simplest form of hydraulic devices in that they permit free oil flow in one direction and block oil flow in the opposite direction. Check valves may also be used as a directional or pressure control in a hydraulic system.

Conclusion

Thank you for reading our article and we hope it can help you better understand the use and mechanism of check valves. If you want to learn more about the use and mechanism of check valves, we would like to advise you to visit Adamant Valve homepage for more information.

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The selection of sanitary check valves is an art. The latest development has indicated the necessity for the designers to fully understand the mechanism inside the valve so as to manufacture valves satisfying particular applications and censorious options. But for the users, it is significant to further recognize the internal and external natures of the valves when determining options.

To select and evaluate the sanitary check valves, it is necessary to notice the exact driving forces and applicable situations. Some common factors such as temperature, pressure, media corrosion as well as external materials could all affect the performance.

That is the reason why there are numerous types of sanitary valves. The best may not be the dearest but the fittest.

In addition, the correct operation and maintenance should also be paid enough attention to. Some unsuitable behaviors or sudden issues at some point can cause vital problems. For instance, when the sanitary check valve is opened in the condition of the wrong installation, the turbulence and vorticity of the media prompt the internal parts of the valve to vibrate or rotate to wear and break the valves.

This kind of damage is more severe than the damage that would happen if you open and close it thousands of times in normal circumstances. If no proper remedial action is taken at this time, the reflux may eventually close suddenly and produce a water hammer, which possibly leads to complete destruction of the valve.

Then fatigue cracking or fractures often appear, reminding the user of getting it repaired or substituted. As we can see, to ensure regular functions, confirming the right status of the valve is sometimes more crucial after selecting options.

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Features of 3-in-1 check valve:
1. With a single sanitary valve, you can have three functions: water-hammer-free check valve, balance valve, gate valve.
2. When the pump stops running, the spring will close the valve flap first, thus prevent water hammer from occurring.
3. By adjusting the opening, the output of the pump can be adjusted.
4. With an indicator, you can use eyes to confirm the degree of opening of the valve.
5. The sealing gasket is made of nitrile rubber, so it will not leak and can sustain the impact.
6. The spring is made of stainless steel, which has a high corrosion resistance.
7. With an equipment material and cost that can save water, installation space is reduced.
8. Due to highly streamlined shape and structure, the pressure drop is very small.
9. Due to the bypassing role, it can recover water within the outlet side of the pipeline and replenish water when vacuum occurs at the inlet side.
10. I can be installed on both horizontal pipelines and vertical pipelines.

Installation and adjustment of 3-in-1 check valve:
1. When installing, pay attention to the water flow direction outside the valve. It should be installed according to the flow direction. Both vertical and horizontal installations are fine.
2. Adjusting the opening of the valve stem can change the amount of flow. The size of the opening can be shown on opening indicator.
3. Tightening the valve stem clockwise can cut off the medium, acting as a sanitary shut-off valve.

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The material also enables a smooth flow of liquid. This is a very important feature, especially in industries that use viscous liquids. Check valves come in different prices and sizes, and they are normally small and simple.

There are different types of check valves in the market but the fact that we are talking about sanitary check valves, we will talk about their features and where they can be applied. The good thing about this valve is that it can be fixed on almost any piping system or even a pump. It also has a low maintenance cost. It is simply the best choice for a company that wants to maintain hygiene. Here, we are going to talk about sanitary check valves with union connections.

A sanitary check valve with union connections is also known as the non-return valve. The valve has been designed to prevent the backflow of fluids. It is a spring check valve designed with tri-clamp ends.

The valve has been designed with corrosion-resistant material to prevent contamination. This is because of its ability to allow the passage of highly viscous fluids and particulate materials. This valve has been designed to work when the pressure below the valve plug exceeds the pressure valve plug and the spring force. The valve can only close when the pressure has equalized.

The valve has been designed using the latest technology to minimize the chances of leakages. The valves are also stainless steel which means that there are fewer chances of contaminating the fluids. They are also easy to install. Moreover, it has a low maintenance cost and has been designed with a smooth inner lining to allow the smooth flow of the medium. Sanitary check valves with union connections are simply the best valve anyone can use to prevent backflow of the medium.

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Micro-resistance slow-closing check valve is also known as a micro-resistance slow-closing non-return valve. Its role is to prevent the medium backflow in the pipeline. Sanitary check valve is a kind of valve that its an opening and the closing member automatically open or close through the movement of the medium in order to prevent the medium backflow.

Check valves are among the category of automatic valves. They are mainly used on the pipeline that the medium flows in one direction, which only allows the medium to flow in one direction to prevent accidents. They’re suitable for clean media, not suitable for mediums containing solid particles and viscous medium.

The structural features of micro-resistance slow-closing check valves:

1. The structural length is short. Its length is only one-fourth to one-eighth of traditional flange check valves.

2. Small size, lightweight. Its weight is only one-fourth to one-twentieth of traditional check valves.

3. The valve flap closes quickly and the water hammer pressure is small.

4. Usable on both horizontal and vertical pipes, easy to install.

5. Smooth flow channel, small fluid resistance.

6. Sensitive, good sealing performance.

7. The stroke of the valve flap is short. The impact when closing the valve is small.

8. Integral structure, simple and compact, beautiful appearance.

9. Long service life, highly reliable.

Conclusion

Thank you for reading our article and we hope it can help you better understand the structural features of micro-resistance check valves. If you want to learn more about micro-resistance check valves, we would like to advise you to visit Adamant Valve homepage for more information.

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These valves have been designed to prevent the backflow of fluids into a piping system. They are also referred to as check valves and are mainly used in piping systems. This valve is constructed with spring and three clamping ends. It is widely used in the chemical, biotechnological, pharmaceutical, beverage, and food industries.

The valve has been designed for hygiene and a number of industries are now turning to the use of this amazing valve. The valve has been designed in such a way that when the pressure just below the valve plug is higher than the one above the valve plug and the spring force, it opens. When the pressure becomes equal, the valve closes.

The sanitary check valves with the union have been built with a stainless steel material that makes them non-porous. The check valves with union also have smooth surfaces to allow fluid flow and are stable. The valve itself has two main parts of the body.

The check valves with the union are also self-draining. This facilitates the rinsing of products that may be trapped inside the valve; which makes it easy to clean. The stainless material also minimizes fluid flow resistance and this means that this valve can be used with viscous liquids.

This sanitary check valve is flexible, which means it can withstand variable flow conditions With its easiness to clean and maintenance-free, it is quite effective to prevent water hammers. Therefore, it can be your ideal solution in the United States.

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