Swing check valves are valves that will either block reverse flow or allow forward flow in a piping system. The term "swing" refers to the action of the plug--in this case, a flap (usually a disk)--that swings on a hinge. The assembly is sometimes referred to as a "clapper."
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Swing check valves normally operate without any external intervention from people or motors--they rely on the flow. They are used extensively in various piping systems that move liquids, gases, steam, condensates, and even air.
In order for a swing check valve to work, it must utilize a minimum upstream pressure strong enough to move the flap. This is known as the "cracking pressure." The size and styles of check valves revolve around this measurement.
The greater the flow rate, the further the flap will swing open on its hinge. Most check valves are considered fully open at around 85 degrees.
The purpose of a check valve is to prevent backflow. Backflow is a reversal of fluid travel. Swing check valves are in-line check valves used in all-size applications, but they are often used for large-diameter applications. So, how does it work?
The pressure and flow of the fluid hold the valve open, just as it will hold the valve in a closed position against a seal in the case of back pressure. A toilet works on basically the same principle. As water fills the tank, it pushes the seal closed and holds it there until you flush the toilet again. The only difference is that a toilet has an external actuator (the flush handle), while swing check valves don&#;t.
A swing check valve can be mounted horizontally or vertically if the flow is coming from the bottom. However, the vertical orientation will cause a higher cracking pressure due to the weight of the flap. Additionally, if you do mount a swing check valve in a vertical position, the flow must always travel upwards.
Check valves are common in any piping system, especially those that incorporate any kind of pump. Swing check valves may consist of a variety of different materials. Typically, in industrial applications, the valve body consists of stainless steel, cast steel, or carbon steel. These substances are a lot tougher and can handle a broader array of conditions.
These applications are the kind found in water distribution or sewage treatment facilities. Swing check valves are also very common in the oil and chemical refining industries and related applications. Diameters of swing check valves can exceed 2 ft across or more, depending on the amount of flow, flow pressure, as well as backflow pressure.
The simplicity of the self-automated swing check valve makes it a frequent part of any piping system--domestic, commercial, or industrial--that moves fluids via a pump. This list would include cooling towers, boilers, and HVAC units--places where preventing backflow is needed.
When something fails in a piping system, the check valve is often blamed, though it is highly unlikely that it is at fault. Swing check valves are practically foolproof. When matched correctly&#; meaning matched to the amount of flow pressure rather than a piping system's diameter-- a swing check valve will provide maintenance-free service for a very long time.
Trouble-free service comes with proper installation and application, which means there will be no disk "flutter." Flutter happens when the valve is not matched properly to the flow rate, and backflow is allowed to pass.
Another potential issue that you may encounter is that things sometimes get stuck in these check valves. This can become a major problem, as anything stuck in the check valve will prevent it from functioning properly.
Swing check valves are an excellent addition to many kinds of systems. However, they're also subject to a wide range of different problems. These include the following:
Rather than being two entirely individual types of valves, a swing check valve is merely a specific type of check valve. It differs from other check valves in that this check valve has a swing or hinged disc, which can only open in one direction.
Like other check valves, a check valve of the swing type allows flow in one direction but slams shut in the face of reverse flow. This ensures that there will be no backflow. Spring check valves are a worthy candidate for comparison. They also prevent backflow through the use of a spring-loaded flap or disc.
You should install swing-type check valves wherever there is a risk of reverse flow that can contaminate the transported media or damage parts of the system. They can be installed horizontally as well as vertically, as long as there is upward flow on vertical installations.
While both swing check valves and backflow preventers block reverse flow, these two valves are not the same. Both are automatic valves that prevent upstream flow, but backflow preventers create a stronger, more trustworthy seal, making them more appropriate for drinking water systems.
Swing check valve operation is also trustworthy, but less so. This makes them better suited to non-potable water sources or those with minimal risk of contamination.
Spring check valve and swing-type check valves both offer great versatility. Swing check valve operation relies on water pressure to push the flap or disc against the valve seat.
On the other hand, a spring-loaded check valve has mechanical energy behind it. The spring will reliably push the flap or disc up against the valve seat, even if there's no pressure behind the flap.
This means that the flow stops as soon as there's no pressure in the appropriate flow direction. That said, either of these check valve types works well for most standard applications.
You can install the valve body for a swing check valve in either a vertical or horizontal position. However, these valves may encounter a wide array of problems if installed in a vertical position. And, when using them vertically, they're only effective if the flow comes from below. Even so, the valve disc may tap against the valve seat, leading to a water hammer. Consequently, it's much better to install the valve body in a horizontal position.
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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.
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 valvestainless 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 di&#;erent mass &#;ow 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.
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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 , 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:
.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.
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