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Swing Check Valve

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What Is Swing Check Valve

A swing check valve is mounted with a disc that swings on a hinge or shaft. The disc swings off the seat to allow forward flow and when the flow is stopped, the disc swings back onto the seat to block reverse flow. The weight of the disc and the return flow has an impact on the shut-off characteristics of the valve.

Swing Check Valve

Swing check valves have many uses, from sewage systems and wastewater treatment to firefighting, power plants, and various household items. One of the most commonly known examples of this valve type

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Stainless Steel Swing Check Valve

Stainless Steel swing check valve is used mostly in the water flow systems. The check valves or tilt disc valves are useful for backflow prevention. ... The valves have a check disk inside them that

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Pressure Seal Swing Check Valve

When compared with castings, forged valve bodies offer the advantages of more uniform structure, greater density, higher strength integrity, enhanced dimensional characteristics and closer

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Carbon Steel Swing Check Valve

Carbon Steel Swing Check Valves are widely specified by engineers and operating personnel. They are well-proportioned and sturdily constructed, and they provide the ideal solution wherever check

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API Swing Check Valve

GZP Swing check valves are manufactured to the latest edition of API 600/ASME B 16.34 and tested to API 598.All valves from GZP VALVE are strictly 100%tested before shipment to guarantee zero leakage.

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Advantages of Swing Check Valve

Swing check valve advantages include several benefits that make them a popular choice for check valve uses in various applications. Let’s explore some of these benefits:

Easy Maintenance

Swing check valves are designed for user-friendly maintenance. The bonnet assembly, which houses the hinge and disc, can be easily removed by unscrewing a few bolts. This allows for quick inspections and repairs, minimizing downtime.

Optimum Sealing

Swing check valves feature a precisely designed disc that ensures reliable sealing under various pressure conditions. The disc’s design requires just the right amount of force to open and close, providing dependable performance and enhanced durability.

Versatile Installation

Swing check valves can be installed in both horizontal and vertical positions, providing flexibility in diverse piping systems. This versatility ensures that they are suitable for a wide range of applications.

Preventing Water Hammer

In systems prone to water hammer, swing check valve equipped with levers and weights or springs offer a gentle closing mechanism. This prevents sudden impacts, reducing the risk of damage caused by water hammer effects.

Types of swing check valves

There are several types of swing check valves with their pros and cons. While some are interchangeable for certain applications, a good understanding of the types can help select the most efficient swing check valve for a given application.

Wafer swing check valve

As seen in figure 3, a wafer swing check valve has a very short face-to-face, which is the distance between the inlet and the outlet. The short face-to-face makes clogging in the valve less likely. Therefore, wafer swing check valves are ideal for small installation spaces and viscous and slurry media.

Tilting disc swing check valve

Tilting disc swing check valves use a disc that rests in the closed position at an angle rather than vertically. The disc floats in the flowing media. This design has two significant benefits. First, the valve closes faster and reduces the effect of water hammer. Second, the valve can open at very low flow pressures.

Y swing check valve

Y swing check valves are suitable for applications similar to in-line swing check valves. As seen in figure 4, the added opening that makes the Y shape allows a user to investigate the inside of the valve without removing it from the system.

Applications of Swing Check Valve

Made of metal or PVC, swing check valves best suit pipes that receive a steady flow of fluid. Repeated instances of sudden pressure changes may damage swing check valves and result in leaking (referred to as passing) because the valve cannot seal correctly against the seat.

Swing check valves serve as a simple solution in numerous industries. Some examples include:

Power plants. A variant of the standard swing check valve, silent check valves — also called spring check valves — use a spring to help the valve close with more control. Silent check valves see frequent use in fluid control applications in the power generation sector, such as cooling towers. Of note, it also takes more pressure to open the valve against the spring, so spring check valves are best suited to high-pressure applications.

Natural gas transmission. Swing check valves help prevent the improper flow of gas that could result in dangerous leaks or fires. These valves see broad usage in gas pipelines, commercial and residential gas meters, gas compressors, and more.

Oil and gas refineries. Refineries often use specially designed non-slam check valves to mitigate water hammer — the pressure wave created in the system by a slamming valve.

Horizontal water lines. Swing check valves are ideal for high-volume, consistent-pressure fluid situations. They’re the most common valve used in wastewater treatment and water pumping.

Custom solutions. Each system is different, and sometimes specific applications require a unique modification or entirely original design to solve a challenging flow issue. It may be as simple as changing the angle of the valve or decreasing the disc’s weight, but your valve manufacturer can help you determine if a customized solution is right for you.

Swing Check Valve Maintenance

Swing check valves are known for their low maintenance requirements and long lifespan. However, to ensure continued functionality and prevent potential issues such as leaks caused by foreign particles getting lodged between the disc and seat, it is essential to follow these maintenance guidelines:

Maintain Cleanliness
Regularly wipe off dust and dirt from the swing check valve to prevent the accumulation of foreign particles.

Routine Inspections
Periodically inspect the valve to identify any potential issues:
Check for leakage. If significant leakage is detected, consider replacing the valve.
Examine the valve for signs of corrosion, rust, or wear.
Monitor the pressure and temperature of the fluid passing through the valve, ensuring that they fall within the valve's specified limits.

Replacement and Overhaul
If replacement is necessary, conduct a thorough overhaul of the removed valve.
Clean all valve components meticulously using an appropriate cleaning agent, such as hydraulic fluid or the medium used.
Inspect the components for any debris, scratches, corrosion, wear, or rough surfaces. Smooth out any imperfections through lapping or other suitable methods.
Reassemble the valve components after completing the necessary maintenance.

Proper Storage
Store the valve in a dry, well-ventilated area to prevent moisture, rain exposure, and rust formation.

Secure Opening and Closing Parts
During storage or transportation, ensure that the opening and closing parts are securely positioned in the closing device:
Fix the valve disc in the open position.
Use foam plates to block the inner ports at both ends of the valve's diameter.
Seal the ports tightly with caps to prevent dust and rust, keeping the channels clean and the end surfaces flat.

Regular Checks
For long-term storage, conduct regular checks every three months to assess the condition of the valve:
Evaluate the protection against dirt and rust on the two channels, sealing surfaces, and welding joints.
If dirt or rust is present, clean the affected areas and apply rust-resistant oil for protection.

Key Components of a Swing Check Valve

The swing check valve is made up of several parts that are very vital in the proper functioning of the valve. Let’s break down each key part:

Valve Body: Valve body is the outer shell of the valve that contains all the internal parts of the valve. It is usually constructed of heavy materials such as stainless steel, cast iron or bronze depending on the nature of the media being regulated. The valve body gives the necessary support and also shields the internal parts from external conditions such as corrosion or mechanical impacts. Its material selection is vital in order to guarantee that the valve will be able to handle the pressure and temperature range that it will be exposed to in the system.

Valve Disc: The valve disc is the part of the valve that rotates in a manner that opens or closes depending on the direction of the flow of the fluid. The valve disc is usually manufactured from stainless steel or other materials that are resistant to corrosion since the disc is always in contact with the fluid passing through the valve.

Valve Seat: Valve seat is the internal component of the valve body on which the valve disc comes to rest when the valve is in the closed position. It has a very important function of sealing the valve to avoid back flow. The valve seat is often made from a hard wearing material such as metal or a composite to ensure that it does not wear out quickly and to ensure that the valve seat is a tight fit. The quality and precision of the valve seat are critical to the performance of the valve because any defects in the valve seat will cause leakage and poor performance.

Hinge Mechanism: The hinge mechanism is used to join the valve disc with the valve body so that the disc can open and close. This part is vital for the movement of the valve and is expected to endure the cycles of operation throughout the life of the valve. The hinge is usually made of the same material as the valve disc or the valve body to ensure strength and corrosion resistance. The position of the hinge and the design of the hinge are critical in the operation of the valve and the amount of wear on the valve disc and the valve seat.

How Does a Swing Check Valve Work?

Swing check valves work a little like a butterfly valve. They have a disc inside that covers the opening of the valve. That opening has to be clear in order for anything to pass through. The disc is attached to a hinge, so the disc can swing open or closed when liquid hits the disk. It's kind of like a circular door. The direction of the flow is the most important thing when using these valves.

When liquid is traveling in the desired direction, the pressure of the flow pushes the door open, allowing liquid to pass through. When liquid travels in the wrong direction, the opposite happens. The force of liquid coming back through the valve pushes the disc against its seat, closing off the valve. When installing a swing check valve, it is vital that it opens when liquid is passing through the desired direction. If you install one of these valves and no water goes through, then it is the wrong way around and must be reinstalled. If your swing check valve has a true union design, it can easily be removed from the pipeline.

These valves are available in many different forms. Metal swing check valves are often seen in heavy industrial use. However, a swing check valve can often handle the same jobs and will be much less expensive.

Material Selection For Swing Check Valves

Let’s shift gears and chat about what swing check valves are made of. Picking the right stuff means the valve will work great and last a long time, even when going gets tough.

● Common Materials and Their Properties

Here’s the lowdown on what’s what:

Carbon Steel: It’s tough and lasts a long time, but watch out for rust if it’s not coated right. It’s good for regular systems where fluids aren’t meant for metal.

Stainless Steel: This one’s a champ against rust and falling apart, and it’s super tough too. Perfect for when you’ve got mean fluids like ocean water.

Nickel-Aluminum Bronze: This is like the superhero against both rusting and wearing away, especially in salty water. Think boats and stuff.

Alloy Steel: If you need muscle and something that can take the heat and pressure, this is your guy. It’s for when things are really heating up or getting squished.

PVC: It’s not heavy, fights off rust well, but isn’t as tough as metal. It’s cool for chill systems with fluids that play nice.

Installation Information For Swing Check Valve

The most crucial factors to consider when installing swing check valves are the flow direction, pressure and nature of the fluid. If these factors are not considered, they may lead to catastrophic failure. Horizontal check valve installation is the most commonly followed because it meets pressure requirements and allows fluid to flow along the horizontal axis. The installation procedure varies from project to project based on the factors mentioned above and the type of connection. However, the following steps act as guidelines for swing check valve installation regardless of the connection:

Pre-installation checks: This involves analyzing the system to ensure the valve size and specifications align with the system’s needs.

Site preparation: It involves cleaning the pipes, ensuring all the flanges are aligned, and tightening the bolts.

Prepare the valve: Start by removing foreign materials from the valve and verifying its functionality by pushing the disk away from the seat.

Attach the valve: Install the swing check valve with the flow arrow pointing to the direction of fluid flow. Then screw it into place and secure all the pieces.

Test the valve: Allow fluid flow to test whether the swing check valve functions as intended.

Our Factory

Our company owns a full set of equipment,complete processing and testing methods.The establishing of CAD valve design center and three-dimensional simulated manufacturing experimental design system ensures that new products with high quality can be developed promptly.Implementing perfect quality assurance system,our company is making unremitting endeavor for obtaining API certification on the passing ISO 9001, CE, API 6D International Quality Certification.

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FAQ

Q: What is the purpose of a swing check valve?

A: Swing check valves help prevent the improper flow of gas that could result in dangerous leaks or fires. These valves see broad usage in gas pipelines – both in natural gas cleaning, distribution, and compression.

Q: What is the difference between a ball check valve and a swing check valve?

A: Ball Check Valves, known for their simple design and robust sealing capabilities, are often favored in systems where backflow prevention is paramount. On the other hand, Swing Valves, with their responsive design and low pressure drop features, excel in applications that demand rapid flow rate changes.

Q: What is the difference between swing check valve and lift check valve?

A: A lift check uses flow pressure in a similar way to swing checks. Flow pressure moves the disc to the open position, and reducing pressure or changing direction moves the disc to a closed position. The main difference in a lift check is that flow does not go straight through the valve.

Q: Where should a swing check valve be installed?

A: Swing check valves are always installed with the HINGE PIN placed horizontally, and above the pipe centerline (as shown in the pictures at the end of this section). Incorrect installation may result in binding, high head loss, and/or sticking in the open position.

Q: Do swing check valves leak?

A: Swing check valves use a hinged swinging disc to block and control the movement of fluid in a system. As they are used to prevent the reverse flow of fluids or gases, any failure can lead to leakage, loss of pressure, contamination, overflow, and, in the most severe cases, complete system failure.

Q: What is another name for a swing check valve?

A: A swing check valve (or tilting disc check valve) is a check valve in which the disc, the movable part to block the flow, swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow.

Q: Can you use a swing check valve vertically?

A: Swing check valve installation. Swing check valve installation can be horizontal or vertical, facing upwards. However, if a swing check valve is installed on a vertical pipe where the flow is upwards against gravity, the disk may slam against the seat when the flow stops, potentially leading to water hammer.

Q: Is a swing check valve a non return valve?

A: What is a check valve? Check valves, also known as non-return valves, only allow liquid to pass through in one direction. Preventing backflow, or reverse flow, of liquids is essential to protecting pumps and other components from damage, protecting buildings from flooding and preventing clean water contamination.

Q: Why use a swing check valve?

A: The primary benefit of swing check valves is their ability to allow a full, unobstructed flow -- which is particularly important in piping systems that may require line cleaning. Swing check valves are also ideal for use in low cost systems with manual valves, such as gate valves in common use.

Q: What is the minimum pressure for a swing check valve?

A: The minimum upstream pressure required to operate the valve is called the cracking pressure, generally between 1 and 5 psi. Check valves are designed specifically with this number in mind. The degree of opening on a check valve is determined by the flow rate.

Q: Where do you put a swing check valve?

A: The swing check valve can be installed in a horizontal or vertical position with the arrow on the side of the valve pointing vertically upwards when installing the valve in a vertical position. The flow of the product in the piping system should be in the direction of the arrow on the side of the valve body.

Q: How long do swing check valves last?

A: While typical component lifespans are application specific, manufacturers suggest metal and plastic check valves should be replace every 5-7 years whereas check valves manufactured from rubber may remain fully serviceable for up to 35-50 years.

Q: How to clean a swing check valve?

A: You'll need to take the valve out and disassemble it to look for debris and scratches. Wash all the parts with hydraulic fluid or whatever fluid is used in your pipe system. Check the housing for corrosion, damage or a rough surface. Buffing can help take care of rough surfaces.

Q: What is the pressure drop across a swing check valve?

A: As a rule of thumb, the minimum pressure drop values for swing check valves are 0.5 psi and 2.0 psi for lift checks. The Guide for the Selection, Installation and Maintenance of Silent Check Valves by the Fluid Controls Institute recommends a 3 psi loss at normal flow for linear lift checks.

Q: What is the life expectancy of a check valve?

A: What is the life expectancy of a check valve? A metal disc valve which pivots on a hinge or trunnion has a life span of 5 to 7 years, compared to 35 -50 years for an elastomeric check valve. Unlike steel bodied check valves, elastomeric rubber check valves require no maintenance or scheduled inspections.

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