In industrial, water and wastewater applications both, swing check valves play a pivotal role in controlling the flow of liquids and gases. This article provides an all-encompassing guide to swing check valves, design , functionality, and maintainance to ensure longevity and performance.
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dn350 swing check valveSwing check valves typically consist of a valve body, a disc, and a hinge. The disc swings on the hinge – in the forward flow, it moves away allowing fluid to pass, and in the backflow, it swings back onto the seat, effectively creating a seal.
api check valveSwing check valves are generally made from durable materials like bronze, cast iron, carbon steel, stainless steel, or PVC. These materials are meticulously selected to ensure resistance to corrosion, high pressure, and temperature fluctuations.
A typical swing check valve consists of a valve body, a disc, and a hinge. The disc is pivotal, as it opens when the fluid flows in a forward direction and closes to the reverse flow and prevent backflow. The hinge is what keeps the disc attached, allowing it to swing either to an open or closed position.
API swing check valve stainless steel swing check valveThe velocity distributions on the symmetry plane of the swing check valve are displayed below when the valve opening is 4%. Upon water vapor passing through the valve seat, a high-speed jet is observed, as indicated, with the maximum velocity reaching approximately 12 times the inlet velocity. This results in a high Mach number. Additionally, a distinct vortex is observed at the bottom of the swing check valve, which is attributed to the presence of the high-speed jet. At the top of the swing check valve, where the cross-sectional area is smaller compared to the bottom, water vapor flows along the surface of the valve disc due to the valve’s structural configuration. Figure 4 illustrates the velocity distributions at various mass flow rates, specifically highlighting instances where significant variations are observed. It is evident that the influence of the high-speed jet becomes more prominent as the mass flow rate increases.
velocity distributions under different mass flow rates for swing check valveAPI 594 is a standard set by the American Petroleum Institute (API) that specifies the requirements and dimensions for check valves, including swing check valves, which are used in the petroleum and natural gas industries.
So for swing check valves, It is API 594 Type A standard.
The dimensions specified in API 594 for swing check valves include face-to-face dimensions, which are critical for installation, as well as dimensions of other parts like the valve body, valve disc side, and hinge pins.
Face-to-face dimensions are important as they tell you how much space the valve will take up along the pipe, ensuring compatibility with the pipeline it’s being installed in. For example, a typical 6-inch swing check valve complying with API 594 may have a face-to-face dimension of around 292 mm (or around 11.5 inches), but this can vary.
It’s important to note that there are multiple dimensions and specifications within API 594, and these can also change. Since swing check valves come in various sizes and pressure ratings, the dimensions will vary accordingly.
For the most accurate and up-to-date information on API 594 swing check valve dimensions, I recommend consulting the latest version of the API 594 standard or contact THINKTANK who specializes in API-compliant valves. We are a professional swing check valve manufacturer based in China, specialize in the production of various industrial valves, including swing check valves. It’s important to conduct due diligence and research when choosing a manufacturer, to ensure the products meet the standards and specifications required for your particular application. Our engineers and valve specialists can provide valuable insights on the specific dimensions required for your application.
swing check valve relation between disc opening angle and timeThe following image shows the distribution of pressure and temperature at different mass flow rates.
When the mass flow rate is below 10% of the rated flow, the pressure variation is minimal, resulting in a negligible temperature difference. However, as the mass flow rate increases, a significant pressure difference becomes evident, with the maximum pressure difference reaching 0.4 MPa at a flow rate of 40% of the rated flow.
Analyzing the temperature distributions, it is apparent that there is a notable temperature variation at higher mass flow rates, with the maximum temperature difference reaching 200 K.
distribution of pressure and temperature at different mass flow ratesHydraulic swing check valves are composed of several key components, including the valve body, valve seat, valve disc, valve cover, and heavy hammer.
In terms of the pipe lengths associated with hydraulic swing check valves, the upstream pipe length is typically designated as 4D, indicating that it should be four times the nominal diameter of the valve. Similarly, the downstream pipe length is typically specified as 10D, meaning it should be ten times the nominal diameter of the valve. These pipe length ratios help ensure proper flow dynamics and optimal performance of the swing check valve in the hydraulic system.
hydraulic swing check valvesSwing check valves are subject to various standards that dictate their design, dimensions, material specifications, testing, and marking. The selection of a standard depends on the industry and the specific application. Some of the widely recognized international and industry standards for swing check valves include:
When selecting a swing check valve, it is important to choose one that adheres to the standards applicable to your industry and region. It is also critical to understand the specifications of the system in which the valve will be installed, such as pressure, temperature, and fluid compatibility, to ensure that the valve will perform effectively and safely.
Swing check valves are self-actuating. The pressure of the fluid passing through the valve forces the disc to swing away from the valve seat, allowing flow. When the flow ceases or reverses, the spring or disc returns to its seat, preventing backflow.
api check valveIt’s important to understand that the full swing check valve operation can create pressure drop in the system due to the swinging motion of the disc. This pressure drop must be accounted for in system design to ensure that adequate pressure is maintained for proper functioning.
swing check valve relation between disc opening angle and pressure differenceSwing check valves are widely used across various industries including petrochemical, pharmaceutical, water treatment, and food processing. They are particularly useful in systems where it is necessary to prevent backflow, such as in pumping applications or in systems with varying pressures upstream flow through.
As of my last knowledge update in September 2021, the Harmonized System (HS) code for a swing check valve would likely fall under the category of taps, valves, and similar appliances. Please note that HS codes can change, so you should verify the most current code with a relevant authority or through an updated resource in your nation.
Typically, swing check valves could fall under the following HS code:
8481.30 – Check valves
This code is used for international trade and classifies the swing check valve under a broader category of taps, cocks, valves, and similar appliances for pipes, boiler shells, tanks, vats, or the like, including pressure-reducing valves and thermostatically controlled valves.
However, as HS codes can be detailed and specific, and there may be updates or changes, I would recommend consulting a customs specialist or using an updated tariff schedule to confirm the current HS code for swing check valves in your country or the country you are exporting to.
dn500 20″ swing check valveIn fluid control systems, swing check valves are crucial components used to prevent backflow. Their installation can be either horizontal or in vertical position, depending on the system’s requirements. In this article, we will focus on the vertical installation of swing check valves and its significance.
Vertical installation of swing check valves is usually preferred when space is limited or the pipeline is vertically oriented. Additionally, in some applications, a vertical installation may facilitate better flowing fluid dynamics within the system.
In a vertical installation, gravity can assist in the closing of the valve. This is particularly useful in low flow systems where the weight of the fluid might not have sufficient force to fully close the valve.
Installing a swing check valve properly is crucial for its optimal operation and for ensuring the safety and integrity of the piping system. Below is a general installation guide for swing check valves. Please note that you should always consult the manufacturer’s instructions and relevant regulations, and ensure that personnel are qualified for the installation.
Position the valve in the location where it will be installed. Ensure that the flow arrow on the valve body matches the direction of flow in the pipeline.
To ensure the longevity and performance of swing check valves, it is essential to perform regular inspections. This includes checking for leaks, ensuring that the hinge pin is not damaged, and that the disc swings freely.
Over time, debris can accumulate in the valve, affecting its operation. It is crucial to periodically clean the valve and apply suitable lubrication to the hinge to ensure smooth operation.
In the event that parts of the valve become worn out or damaged, they must be replaced promptly to avoid valve failure. This includes replacing the disc or the hinge pin if they become excessively worn.
Regular testing of the valve under operating conditions is essential to ensure that it is functioning correctly. This might include pressure testing to ensure that the valve is sealing properly under cracking pressure and that there is no leakage.
Swing check valves are an indispensable component in many industrial applications. Understanding the design aspects, operational principles, and maintenance procedures is vital for those who utilize these valves in their systems. Regular inspection, cleaning, and timely replacement of parts are crucial in ensuring their longevity and optimal performance.
8 swing check valve 300lbWe, at THINKTANK, take pride in being a reliable supplier of swing check valves. Our commitment to quality and precision sets us apart. We manufacture swing check valves that conform to international standards and meet the stringent requirements of various industries. Each valve undergoes rigorous testing to ensure optimal performance and long-lasting durability in diverse industrial applications. By employing advanced manufacturing techniques and utilizing high-quality materials, we deliver reliable swing check valves that offer efficient fluid control, effectively prevent backflow, and contribute to the overall reliability and safety of fluid systems. With our expertise and unwavering dedication to customer satisfaction, we have earned a reputation as a trusted supplier of dependable swing check valves. Contact us today and you will have no worries in your valve business.
DN80 swing check valveIf you have any questions about the flanged check valve, you will find the answer right here.
From parts, working principle, end configuration, material type, surface finish to features – all information you need is in this guide.
So, if you want to be an expert in flanged check valve, keep reading.
A Flanged Check Valves a valve designed for the purpose of isolating media as it flows through the piping system.
It performs this function through its ability to open and close simultaneously.
The media can be liquid and gas.
Flanged Check Valve
The following are the parts of a flanged check valve system:
The numbers labeled in the diagram above represent parts as follows;
The main role of a Flanged Check Valve is to control the flow of fluid in a piping system.
This occurs through the valve opening and closing.
Its design enables it to prevent leakage through its complete closure.
This enhances zero percentage of corrosion of the system at hand.
The fluid in this case commonly refers to liquid and gas.
Other fluids include fluidized solids and slurries.
The valve is designed to control the flow of fluid in the piping system.
It does this by opening, closing, or partially blocking various passageways in the process flow.
The position of the disc and handle changes depending on whether the valve is open or shut.
The valve moves down to block the flow of fluid.
The flowing fluid then pushes it up, making it open.
It basically checks the fluid flow in one direction.
It requires a higher pressure on the input side and a lower pressure on the output side to open.
When the pressure on the output side is higher than that of the input side, the Check Valve closes.
The common uses of flanged check valve include:
The typical properties of flanged check valve include:
Here are some of the advantages of a flanged check valve:
Threaded Flanged Check Valve
The End connection for Flanged Check Valves should meet various standards.
They comprise of:
Based on size and pressure rating.
Based on using four bolts located on the corners of the rectangle.
They can be split into two halves or left as a whole.
They are slim in nature.
This connection type makes them simply squeeze the valves between two flanges using long bots or threaded end rods.
The Flanged Check Valve is basically controlled by the difference in pressure.
It requires a higher pressure on the input side and a lower pressure on the outlet side to open.
When the pressure on the output side is higher than that of the input side, it closes to prevent backflow.
It controls the flow of fluid in the piping system by opening, closing or partially blocking various passageways in the process flow.
The position of the disc and handle changes depending on whether the valve is open or shut.
A build-up of pressure on the output side could result in failure of the valve and the whole flow at large.
The common materials used to make Flanged Check Valves consist of:
You should mount the valve in the right direction to prevent backflow and enhance the proper running of fluid.
The valve housing often has an arrow indicating the right direction of flow.
Fixing the valve in the wrong direction causes backflow of the fluid.
A backflow is inconvenient and causes damage to the fluid and also the pipes.
The pipes might corrode and wear out. Backflow also causes contamination of the clean fluid.
The correct mounting directions of the flanged check valve are;
There are different flanged check valve designs.
The designs are suitable for all the various needed aspects of the process flow, and they include:
Flanged Ball Check Valve
The selected Check Valve should have the right size.
In order to do this, you should determine the minimum velocity required to lift the disc of the valve.
Then, find the mean velocity of flow in the piping system.
The mean velocity should be greater than or equal to the minimum required velocity.
The accuracy of determining the right size comes with various advantages evident in usage.
During the selection of the flanged check valve, you should consider the external temperature as well as that of the medium in question.
It should resist the high temperature of the medium for efficiency.
If it cannot withstand the high temperature, it might burst to cause leakage of the medium, hence corrosion of the pipes.
The material should be compatible with the medium.
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The best material recommended is Viton, since it withstands all the conditions.
It is possible to use this material in all flow situations, including those that no other material type could be used.
The maximum and cracking pressure in the Flanged Check Valve basically makes the valve work.
The cracking pressure refers to the least pressure needed to push the valve open and allow the fluid to flow through.
The inlet pressure should be higher than the outlet pressure to ensure that it does not flow back and cause contamination.
Flanged Checking Valve should be strong enough to withstand or resist the maximum and cracking pressure of the media.
VITON is the best and recommended material for Flanged Check Valve Seal.
This is because it resists all the harsh and tough conditions of both the media and pipe.
It can withstand high temperatures as well as very low temperatures without melting or freezing out.
This a feature that makes it stand out from other materials.
The material is able to withstand the cracking pressure; the pressure needed to open and close the valve in a simultaneous way.
Normally, you use Viton seals in applications where nothing else could work.
The cost of Flanged Check valves is relatively cheap.
The cost somehow depends on the material used to make the Valve.
Moreover, the complexity of the Check valve matters too.
A simple Flanged Check Valve costs less than a complex one.
The average price ranges from $35-$600.There is also a cost of professional labor.
Basically, the valves that cost higher have better quality and this indicates that they last for a longer period of time.
These are better than those that cost less and last for a shorter time.
There are various coating options for the Flanged Check Valves, which include:
The coefficient Valve Flow in Flanged Check Valves ensures that fluid does not flow back.
The backflow of fluid could lead to contamination of the clean fluid.
For example, in a water sewer plant, there is a need to prevent sewage from flowing back into the pipe.
It would be bad if it flows back and contaminates the clean water.
The coefficient flow ensures that this never happens.
What enhances this is the pressure of the fluid that opens the valve.
If this pressure reduces, the valve automatically closes preventing the fluid from flowing back.
The pressure at the input part should be higher than the outlet pressure.
The pressure difference ensures that the fluid does not flow back and cause contamination.
No, the Flanged Check Valves are primarily designed for wastewater.
They are instrumental in ensuring that used water does not flow back into the system as this could contaminate clean water.
However, Swing Check Valves are the best-suited type of Valves for drinking water.
Choosing a suitable Flanged Check Valve means a perfect process system.
You need to select the valve after thorough consideration of various factors.
Axial Double-Disc Flanged Check Valve
Here are the factors to consider when choosing Flanged Check valves;
a) Material: It should be compatible with the medium.
b) Size: The size for connection points should align with that of the Flanged Check Valve.
c) Maximum pressure and cracking pressure requirement: The Flanged Check Valve chosen should withstand the pressure of the medium.
d) Installation requirement: This depends on whether the installation should be horizontal or vertical.
e) Accessibility needs for inspections and repairs: Readily available Valves should be chosen over rear ones. Those that are easily accessible are easily reached during inspections and repairs.
f) Temperature: The Flanged Check Valve should be able to withstand the external and media temperature.
The right Flanged Check Valve withstands all aspects of the media.
A valve with good material is reliable because it resists high temperatures as well as pressure.
Despite their advantages, there are various disadvantages of flanged check valves that comprise of:
It indicates the right way in which you should install the flanged check valve.
Basically, it should be connected based on the direction in which the medium flows.
A change in this messes up with the general functionality of the valve.
In the long run, the valve might fail to work thus the process flow will break down.
This damages the whole system as well as the medium.
To avoid such cases, you should observe the correct arrow direction and other given instructions.
The Flanged Check Valve should ideally be put between the water pipe and the tank or pump.
Simply put, it should connect the pipe to the tank or pump with its handle at a reachable point.
This allows for easy turning on or off by the user.
You should do this with the correct direction of the water flow in mind.
The size of the valve should suit the size of the pipe.
This makes it perfectly fit for the task and very efficient.
Flanged Check Valve Installation
During installation, it is important to use the right size of the Check Valve on the pipe in question.
An arrow on the Valve housing should always guide one to install the Valve.
The arrow marks the direction in which the fluid flows and you should install it in that same direction.
A change in direction could lead to failure of the process flow.
Flanged Check Valves can exhibit failure in ways such as;
You can solve this by checking the inlet pressure. In this case, the Flanged Check Valve is definitely obliged to automatically close if this continues.
Increase the inlet pressure to enhance a continuous flow without interruption.
Changing the Valve or adjusting it should help fix this.
Increasing inlet pressure would also help a lot.
Correct this by tightening the nuts.
It is also advisable to check the inlet pressure to ensure it is higher than that of the outlet.
If the pressure at the outlet is more, the valve closes.
Therefore, to solve this, the input pressure should be higher than the output pressure.
Make sure you maintain this pressure difference.
Yes, there is a need to periodically maintain the Flanged Check Valveto enhance the efficient flow of fluid.
Although it features a self- cleaning mechanism, it does not mean that it will stay in good working condition throughout by itself.
Maintenance ensures zero leaks.
It also enhances the required amount of fluid flow with the required pressure.
Poor maintenance could lead to problems with the flow system, contamination of the clean fluid, and even failure of the complete system.
Therefore, prevention helps avoid major issues that could inconvenience the process flow.
Flanged Check Valve Cross-Section
In order to function efficiently, you need to maintain Flanged Check Valves well.
It is important to keep the valves clean and taking steps to prevent damage to the valve system.
You should do a regular inspection of the equipment to ensure it is in good working condition.
Keep the valve clear for easy opening and closing.
Remove anything external that may cause blockage.
Furthermore, make sure to replace handles and other parts of the flanged check valve from time to time.
This makes the Check Valve efficient and remains in good working condition.
A bad working condition causes the build-up of pressure on the outlet side of the flow system.
This in turn causes great damage and wear.
It might also cause a backflow of the fluid that leads to contamination of the clean fluid.
Moreover, it is also advisable to keep the valve lubricated to avoid friction and eventual wearing out.
Friction also causes noise.
Frequent coating by applying the protective insulation is important.
This helps prevents corrosion of the equipment.
Still, if you have any questions on the flanged check valve, Kinvalve is here to help.
We design and produce a range of flanged check valves depending on your unique requirements and specifications.
Contact us now for all your flanged check valve needs.
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