Your Reliable Swing Check Valve Manufacturer

Kinvalve: Your Trusted Swing Check Valve Manufacturer

At Kinvalve, swing type check valves are available in both threaded connections and flanged connections.

Although swing check valves can come in various sizes, for threaded check valve swing type, it is a small check valve in common, ranges from 1/4 inch to 4 inches.

And the pressure rating of the 200psi check valve is the commonest threaded swing check valve. So threaded swing check valve is the low-pressure check valve in most of your applications.

Kinvalve flanged swing check valve is often recommended in large check valves. Kinvalve offers flanged swing check valves in DN 50-300.

And flanged swing check valves are available in pressure ratings of Class 150 and Class 300. You can easily to maintain or access these swing check valves from the top bolted or screwed in caps.

Kinvalve stainless steel swing check valves are the hot sale products on the market. However, both threaded swing check valves and flanged swing check valves are often made of stainless steel in the cast body.

Stainless swing check valves are made of CF8, CF8M, CF3 and CF3M, other alloy steel also available for your customized requirements.

As a professional swing check valve manufacturer with over 18 years of experience, Kinvalve always devoted themself to designing the swing check valves in accordance with the industry’s latest standards.

The new line of cast steel swing check valves from Kinvalve provides quality performance in demanding applications.

Our swing check valves are always designed with the anti-rotation disc, Non-penetrate disc shaft as well as renewable seat rings.

In a conventional Kinvalve swing check valve, you can find a PTFE or stainless steel plug flexible graphite gasket between the body and the bonnet to ensure a leak-proof seal. You have choices to choose a welded seat ring or integral seat for reliable shutoff.

The precise design of the disc and hanger mounting connection ensures the independent swing of the valve disc, and can accurately align with the valve seat to provide good sealing.

We choose welded valve plate nuts for you to avoid loosening due to vibration and closing impact. You can also choose a Stellite overlay seat to increase resistance to wear abrasion and erosion of the sealing surface.

All of the above-improved designs for the weakness of the swing check valve all reflect our deep understanding and grasp of product characteristics.

We are committed to continuously improving our design to provide customers with better quality and solutions.

In closing, as a distinct swing check valve manufacturer, Kinvalve can provide a variety of swing check valves available for you to choose from, including traditional flange or threaded check valves, wafer swing check valves, spring loaded swing check valves.

We believe there will always be one for you. Just call us.

Swing Check Valve: The Ultimate FAQs Guide

I know you’re looking for a high-quality swing valve.

Or, you just want to learn more about the swing check valve.

That’s why this guide will take you through all the vital aspects of swing check valves, from design, features, benefits, a working principle to the installation process, among other critical aspects.

What is a Swing Check Valve?

It refers to a valve mounted using a disk to swing on a shaft or a hinge and transport fluids only in one direction.

Swing Check Valve

How Does a Swing Check Valve Work?

The swing check valve has a disk on the inside, used to cover the valve opening.

This valve opening needs to have no obstruction for anything to pass through it.

A shaft attached to the disk enables it to swing to open or close when liquids hit it and resemble a circular door.

When using the swing check valve, the direction of the flow is the most important factor.

When the liquid moves in the wanted direction, the disk can swing off the seat to enable movement in the forward side.

The force of the liquid flow opens the door by pushing it to enable the liquid’s passage.

If the liquid moves in the wrong direction, the disk gets stopped, it can swing back to the seat to prevent backward flow.

The flow of returning liquid enables it through the valve that moves the disk against its seat to enable the valve’s closing.

During the installation of the valve, it is important to ensure that it opens when liquid moves through to the required direction.

In case the liquid moves in the wrong direction, you may require to reinstall it.

Some of the factors that contribute to the swing check valve’s on and shut off features are the disk’s return flow and its weight.

What are the Applications of Swing Check Valve?

They require no external power, and this makes them ideal for many applications. Some of the uses of the swing check valve include:

• Used as a flapper valve in a flush-toilet mechanism.
• Most common valve type in wastewater and water pumping systems.
• Transmission pipelines.
• Onshore terminals.
• Pig traps.

What are the Advantages of Swing Check Valves?

Some of the advantages of swing check valves include:

· Prevents Backflow of Liquid

They have a disk that can swing back and prevent the movement of liquid in a direction that is not desired.

· Maintain Pressure

The nature of the swing check valve enables it to keep the pressure constant while ensuring the liquid flow in the desired direction.

Turbulence and pressure drop in the valve is very low.

· Serves as a Backup System

swing check valves require no external backup power and can thus be used as a backup in case of power loss.

· Versatile

swing check valves can be used horizontally as well as vertically.

· Easier Opening

They have an angled seating surface, enabling easier opening on the valve at low pressures.

• Swing check valves have easily replaceable O-ring shaft seals.
• They have more positive sealing and exhibit less shock when closing under high pressures.

What are the Features of Swing Check Valves?

Features of swing check valves include:

• Full bore that ensures low head loss.
• Bonnet or disc design which gives easy access to maintenance of the valve.
• Lip sealing ensures tightness.
• Disc has steel inserts and is fully vulcanized with EPDM rubber for ensuring maximum scalability.
• The lightweight disc requires little force for valve opening and closing.
• Hinge tightened with bolts around the shaft area to prevent play and ensure the swing check valve’s durability.
• The disk can move slightly in both vertical and horizontal directions to enable complete closure.
• Has a ductile iron with a coating of epoxy for compliance with the legal requirements.

What are Swing Check Valves made of?

Manufacturing of swing check valves involves the use of several combinations of chosen materials to effectively suit service conditions.

Threaded Swing Check valve

Some of the available material selection include:

• Low alloy steel.
• Duplex or super duplex or Ni Alloy.
• Stainless steel.
• CS, LTCS.
• CRA weld overlay option is also available.

Available obturator material selection includes:

• CS, LTCS
• Austenitic or Ferritic or martensitic stainless steel.
• Low alloy steel.
• Duplex or super duplex or Ni Alloy.
• The option used is satellite or electroless nickel plating.
• CRA weld overlay option is also available.

Available seat material selection includes:

• CS, LTCS
• Austenitic or Ferritic or martensitic stainless steel.
• Low alloy steel.
• Duplex or super duplex or Ni Alloy.
• The option used for seat material is satellite or electroless nickel plating.

Body sealing methods include:

• Metal to metal.
• Spiral wound type.
• Ring joint type.

Some of the shift sealing methods include:

• O-ring sealing.
• PTFE Chevron type.
• Metal to metal stem seal.
• Bolted shaft closure flange containing metal or elastomeric gasket.
• No hinge pin retainer.
• Redundant elastomeric (AED) stem gasket.

The main parts of a swing check valve include:

• Cover.
• Gasket.
• Body.
• Hinge.
• Disc.
• Hinge Bracket.
• Hinge pin.
• Washer.
• Seat ring.
• Disc pin.
• Seat ring.

What is the Difference Between a Swing Check Valve and a Spring Check Valve?

Some of the differences between the swing check valve and spring check valve include:

· Opening and Closure

The swing check valve has a flapper that swings the seat to enable forward flow and swings back to the seat when the liquid flow is stopped.

On the other hand, the spring check valve uses a spring for closing the check valve.

· Installation

swing check valves are greatly limited in installation orientation as they can only be installed in horizontal flow applications.

On the other hand, you can install the spring check valves in any flow orientation provided that you use the right springs.

The spring check valve will help in minimizing the effects of the water hammer.

On the other hand, a swing check valve can exacerbate the issue; however, they offer a larger flow capacity.

What are the Design Options for Swing Check Valve?

Some of the design options for swing check valve include:

• Swing Check Valve with Lever and weigh: You erect a lever and weigh to obtain efficient functioning of the valve.
• Swing Check Valve with Lever and spring: it is where you erect a lever and external spring for optimum functioning. The design is suitable for insufficient back pressure, high pressure, and high flow velocities.
• Swing Check Valve with closed bushings: this type of valve has a bushing enclosed to regulate the flow of liquids.

What is the Difference between Swing Check Valve and Wafer Type Valve?

Wafer-type valves obtain their name from the wafer-thin design.

Swing check valves obtain theirs from the swinging disks that permit or block liquid flow.

Wafer Swing Check Valve

Swing check valves are not suited for spaces that are extremely tight, like wafer-type valves.

Wafer-type valves are suited for fitting in tight spaces between two flanges.

Swing check valves possess molded bodies around the area where the disk opens.

Wafer-type valves, on the other hand, have no controls on this valve.

With Wafer-type valves, you flange them in place and thus do not have space for opening in the pipeline, thus limiting flow.

On the other hand, switching check valves have molded body, which creates ample room and allows a full flow of liquid.

Swing check valves are suitable for applications that require a full port valve, while wafer-type valves are suitable for applications where the flow is not an issue.

Should you Install a Swing Check Valve Vertically or Horizontally?

Yes, it is possible to install them both vertically and horizontally.

However, it is important to note that installing a swing check valve horizontally may look vertical.

When you install the swing check valve vertically, it will seem horizontal.

However, the most common installation design is horizontally in the pipeline.

Questions about the vertical installation of a swing check valve are mostly referring to the pipeline.

What are the Steps for Installing a Swing Check Valve?

Steps during the installation of the swing check valve include:

 Installation of Swing Check Valve

• Check valve size: it is essential to determine the valve’s size you need before purchasing a swing check valve. Take measurements of the pipes that you will attach to and also check the type of material.
• Look inside the valve; observe inside of the valve to ascertain no foreign object that might have stuck during transportation. These objects may cause the flap to get stuck, thus preventing water flow in the valve.
• Check edges: look at the edges for scratches, uneven edges, or anything that could inhibit correct sealing of swing check valve.
• Confirm valve placement: this step will be changing depending on pipeline direction, and you should look at the arrow showing flow direction. Place the valve in the appropriate direction of liquid flow according to the arrow direction.
• Fix the valve onto the pipeline; finally, you may now put it onto the pipeline. You may do it by either screwing it using hands or securely putting pieces together.
• Test the valve: you may check the swing check valve by turning on the liquid to confirm it has desired flow. In case the liquid is not flowing, you may check the direction of the swing check valve.

What is the Difference between Swing Check Valve vs. Lift Check Valve?

Some of the differences between the two include:

• Swing check valves have a bonnet, valve body, and a disk connected to a hinge. On the other hand, the lift check valve is usually in the design of a ball or a piston.
• In swing check valves, the disk moves away from the valve seat to permit liquid flow in a forward direction. Similarly, when you stop the upstream flow, the disk gets back to the valve seat.

Lift check valve has a precisely guided disk and fits well into the dashpot.

This is unlike that of swing check, which remains unguided and fully opens and closes.

• Lift check valves are suitable for installation on vertical pipelines with an upward flow. You may install swing check valves vertically or horizontally depending on the arrow direction, but allow fluid flow in a given direction.
• Lift check valves fulfill services of high pressure requiring high velocity of flow. The swing check valve is suitable for different pressure.

This is because its nature enables it to keep the pressure constant while ensuring the flow of liquid in desired direction.

• The disk of swing check valve can swing off the seat to enable flow in the forward direction. Moreover, it is also able to swing back onto the seat to prevent backward flow.

Conversely, lift check valve must always enter below the seat.

This is due to the fact that the flow raises the piston within guides from the seat using the upward pressure.

What are the Size and Pressure Standards for Swing Check Valves?

Some of the size and pressure standards for swing check valves include:

• ANSI/ ASME PTC 25.3
• ISO 4126-4
• ISO 4126-5: controlled security pressure relief elements.
• API 526
• API 527
• ISO 4126-6
• EN4126: it protects the valve from excess pressure.
• ISO 4126-2: ensures protection against a lot of pressure.
• API RP 510: this is for inspection code of the level of pressure
• ISO 4126-3: safety devices for protection against excessive pressure- part 3: safety valves
• API 520 PART 2: standard code for installation
• ISO 4126-7: safety devices for protection against excessive pressure-common data.
• ISO 4126-10:
• API standard 2000: low pressure
• API IRE C16: pressure-relieving devices.
• API RP 576: for conducting analysis on the pressure of devices.
• PED 97/23/EC: gives instructions on pressure equipment.
• API 520 part 1: this is for pressure relieving installation and selection of size.
• ISO 4126-9: this is for the process of installing and using pressure devices apart from burst disk safety devices that stand alone.

What are the Two Seat Options for Swing Check Valve?

The seat options for swing check valves include:

• Metal-to-metal seat: These are susceptible to wear and deformation particles that are trapped by fluids. They may also encounter damage due to corrosion, abrasion, and erosion, making it important to put measures in place to control this.
• Metal-to-Soft (Resilient) seat: Recommended for applications where wastewater dirt or other particles are present in the fluid, and there is requirement for positive shutoff.

What are the Bonnet Connection Options for Swing Check Valve?

The bonnet connection options for the swing check valve include:

• Spring Wound Gasket Body-Bonnet Connection: it is the perfect solution meeting problems of exacting conditions of both temperature and pressure in swing check valve joints.
• Ring Joint Body-Bonnet Connection.
• V-Groove seal Weld Body-Bonnet Connection.
• Tee Joint Fillet Weld Body-Bonnet Connection.
• Full Penetration Weld Body-Bonnet Connection.

Are there Customized Versions of Swing Check Valves?

Yes, you may get customized designs for swing check valves by stating your specific requirements to the manufacturer or supplier.

What are the Quality Standards for Swing Check valve?

Swing check valves should meet the following quality standards:

a) ASME Standards

• ASME B16.5
• ASME B16.20
• ASME B16.10
• ASME B16.34
• ASME B16.25

b) API Standards

• API std 594
• API Spec 6D

c) AWWA Standards

• AWWA C510

d) AWWAC508MSS Standards

• MSS SP-84
• MSS SP 80
• MSS SP-42
• MSS SP-61
• MSS SP-71

e) BSI Standards

• BS 1873
• BS 1868
• BS 5352
• BS 5160
• BS 5152
• BS 5153
• BS 5154
• BS 2080

What is the Downside of Swing Check Valves?

The major downside of swing check valves is that you need to install them horizontally.

This is because they require gravity for the flap’s closure, making it difficult to install them vertically.

How do you Maintain a Swing Check Valve?

When you install swing check valves, they will start working immediately.

They do not require a lot of maintenance, but you may keep their performance efficient always.

Maintenance of Swing Check Valve

It would be best if you are looking for:

• Rust.
• Correct flow.
• Leaks.
• Debris.

To keep your swing check valve working optimally for a long time, you should lubricate it and rotate slightly.

In case there are leakages, you may use a few troubleshooting methods but ensure to turn the water or liquid off first.

Do Swing Check Valves Fail?

Yes, swing check valves, at times, do fail. It is important to analyze the cause of the failure so as to establish which method you should use.

Any failure in the swing check valves may lead to:

• Overflow.
• Contamination.
• Loss of pressure.
• Leakage.
• Complete system failure in most critical cases.

Swing check valves may fail due to the following reasons:

· Low Flow Application

This is where swing check valves cannot maintain consistent movement because of insufficient pressure in the system.

It can greatly damage the equipment.

· Water Hammer

It is whereby pressure increases due to sudden stop or change in the direction of fluid flow through the valve.

Repeated closing of the disc against swing check valve body may result in disc detaching from swingarm, damaged fittings, or ruptured pipes.

· Improper Selection or Installation

Proper selection and installation of the swing check valve are essential in ensuring the system’s reliable performance.

Valve selected should be suitable for orientation, material, flow direction, rate, and system’s piping to not have premature component wear and inefficient performance.

Here are some of the ways how to diagnose swing check valves:

Valves that are failing most often exhibit vivid sounds which can be heard by tapping or hammering sound may be heard.

This may result from the repeated opening and closing of the disc due to low pressure or violent flow because of the water hammer.

Although you may not damage the valve at this stage, the noise indicates significant stress on the hinge and swingarm.

It is a clear indication of the wear and failure of the elements over time.

Swing check valves can start sticking, this is a clear indication of an imminent breakdown.

To mitigate the breakdown, grab the disk and stop it from closing.

The conditions of operating may result in leakage or cause harm to other components of the system.

Consult a valve expert after identifying a faulty swing check valve.

The expert will assist you in selecting and installing the required replacement.

How Do you Fix a Swing Check Valve?

You may fix a swing check valve in the following ways:

Leakage on the cover of a swing check valve is mainly a result of a damaged gasket or a loose bolt.

In this case, begin by tightening the bolt and analyze if the problem is solved.

If not, you may have to replace the gasket.

In case there is liquid leakage when you close the valve, there might be damage inside the valve.

To correct this problem, you should clean the flap and establish the damage.

In case you find damage, you may replace the flap or the whole item in case the damage is on the valve’s body.

If the valve does not open, it may indicate some obstruction, and you should uninstall it to find the object.

Then it would be best if you cleaned the valve to allow smooth liquid flow.

At Kinvalve, we design and manufacture a range of check valves such as wafer check valve, stainless steel check valve and spring check valve.

Contact us now for all your swing check valve needs.