Check Valve Casting

Company Profile

Kaifeng High and Middle Pressure Valves Co., Ltd was established in 2004 with a registered capital of 110 million. The factory with an area of 30,000 square meters, 98 employees and 38 technicians. Its main business is to produce and sell high and low pressure industrial valves with an annual output value of 70 million. It is the Member of council in the China Valve Association. Kaifeng Dongli High Pressure Valve Casting Co., Ltd was established in 2007 with a registered capital of 27 million, a factory area of 18,000 square meters, 120 employees and 26 technicians. Its main business is to produce and sell high and low pressure industrial valve steel castings with an annual production capacity of 5,500 tons. It is the Member of council in Henan Casting and Forging Association. Kaifeng Ruiwei Fluid Technology Co., Ltd was established in 2017 with a registered capital of 2 million yuan, 50 employees and 48 technicians. Its main business includes research and development of flow control equipment, technology transfer, technology support ,research and development of new materials for valves.

Why Choose Us?

Our Factory

Our factory covers an area of 30,000 square meters and employs 98 people, including 38 technicians. We specialize in producing and selling high- and low-pressure industrial valves, with an annual output value of 70 million yuan. We are a council member of the China Valve Association. Kaifeng Dongli High Pressure Valve Casting Co., Ltd. was established in 2007 with a registered capital of 27 million yuan.

Production Equipment

Main Production Equipment: 5T medium frequency furnaces, 2.5T medium frequency furnaces, 0.75T medium frequency furnaces, the resin sand flask molding lines with German technology, multiple shot-blasting machines, heating treatment furnaces, full set of model making and excellent mechanical processing equipment.

Production Market

We are a supplier to China’s five major power generation groups, including CNPC, CNP, Daya Bay Nuclear Power Station, and Qinshan Nuclear Power Station. We are also a leading casting supplier for Velen in Canada, Warren in the U.S., JC in Spain, Haguo Group, Wuguo Group, Terrence Valve, and BST Valve.

Our Service

Pre-sales service includes providing customers with selection and technical services.In-sale service includes in the manufacturing process, we providing customers with one-stop service of instant production progress, storage delivery,efficient transportation, on-site installation guidance and debugging.After-sales service includes one-year time of warranty, 24-hours response and solved within 72-hours .

Kaifeng Dongli High Pressure Valve Casting Co.,Ltd. is an ISO9001 and PED certified manufacturer specializing in the manufacture of various customized industrial Check Valve Casting. The most popular materials we make are Carbon Steel, Heat Resistance Steel, Stainless steel, mainly including WCB、WCC、WC1、WC6、WC9、WB36、LCB、LC3、LCC、CF8、CF8M、CF3M、CF8C and Cr、Mo、V steel.

Definition of Check Valve Casting

A check valve casting is a component used in piping systems to prevent backflow. It is made by pouring molten metal into a mold to create the desired shape and dimensions. Check valve castings are typically made from materials such as bronze, stainless steel, or cast iron, and are designed to withstand high pressures and temperatures. They are used in a variety of applications, including water supply systems, HVAC systems, and industrial piping. The function of a check valve casting is to allow fluid to flow in one direction while preventing backflow in the opposite direction. When the fluid pressure in the system increases, the valve opens to allow fluid to pass through. When the pressure decreases, the valve closes to prevent backflow.

Advantages of Check Valve Casting

Check valve castings are an important part of piping systems, as they help to ensure the reliable operation of the system and prevent damage or contamination. They are available in a variety of sizes and configurations to meet the specific needs of different applications.

Durability

Check valve castings are typically made from strong materials such as bronze or stainless steel, which makes them durable and able to withstand high pressures and temperatures.

Corrosion Resistance

Check valve castings are often resistant to corrosion, which makes them suitable for use in harsh environments.

Accuracy

Check valve castings can be produced with high accuracy, which ensures a tight seal and reliable performance.

Customization

Check valve castings can be customized to meet specific requirements, which makes them suitable for a wide range of applications.

Cost-effective

Check valve castings are often more cost-effective than other types of check valves, especially for large quantities.

Types of Check Valve Casting

The type of check valve casting you choose will depend on the specific application and requirements of your piping system. It's important to choose a valve that is compatible with the fluid you are using and that can withstand the pressure and temperature of the system. There are several different types of check valve castings available, including:

Swing Check Valves: These valves use a hinged disc to prevent backflow.

Lift check valves

These valves use a weighted disc that lifts to allow fluid to pass through.

Ball check valves

These valves use a spherical ball to control the flow of fluid.

Silent check valves

These valves are designed to reduce noise and vibration during operation.

Y-strainer check valves

These valves combine the function of a check valve with a strainer to filter out debris.

How Do I Maintain the Integrity of a Check Valve Casting?

01.

Store Properly: Store the check valve casting in a dry, protected area when not in use.

Regular Inspection: Inspect the check valve casting regularly for signs of damage, wear, or corrosion.

Cleaning: Clean the check valve casting regularly to remove dirt, debris, and buildup.

02.

Lubrication: Lubricate the moving parts of the check valve casting as recommended by the manufacturer.

Protect From Extreme Temperatures: Avoid exposing the check valve casting to extreme temperatures, which can cause damage or distortion.

Handle With Care: Handle the check valve casting with care to avoid damage.

The Process Flow of Check Valve Casting

Check valve castings are typically made using advanced manufacturing processes and techniques to ensure accurate dimensions, a smooth surface finish, and reliable performance. The construction of a check valve casting typically involves several steps:

Mold Preparation

A mold is prepared using sand or other molding materials. The mold is designed to create the desired shape and dimensions of the check valve casting.

Melting

The material to be used for the check valve casting, such as bronze or stainless steel, is melted in a furnace or crucible.

Pouring

The molten material is poured into the mold, fill the cavity, and allowed to cool and solidify.

Machining

Once the check valve casting has cooled, it may need to be machined to achieve the desired dimensions and surface finish.

Assembly

The check valve casting is assembled with other components, such as stems, handles, and seals, to create a complete ball valve.

Materials That Can Be Used for Check Valve Casting

The choice of material will depend on the specific requirements of the application, such as the pressure, temperature, and fluid being used. Different materials may have different properties and characteristics, so it's important to choose the right one for the job. Check valve castings can be made from a variety of materials, including:

Bronze: Bronze is a common material for check valve castings due to its durability, corrosion resistance, and machinability.

Stainless Steel: Stainless steel is another popular material for check valve castings due to its resistance to corrosion and high strength.

Cast iron

Cast iron is a relatively inexpensive material that is often used for low-pressure applications.

Aluminum

Aluminum is lightweight and corrosion-resistant, making it a good choice for some applications.

Brass

Brass is a durable and corrosion-resistant material that is often used for high-temperature applications.

The Machining Requirements for Check Valve Castings

The machining requirements for check valve castings may vary depending on the specific application and design of the valve. However, some common machining requirements include:

Surface Finish: Surface Finish: the check valve casting should be smooth and free of defects such as porosity, cracks, and inclusions. A good surface finish helps to ensure a tight seal and prevent leaks.

Dimension Accuracy: The dimensions of the check valve casting should meet the specified tolerances to ensure proper fit and function with other components.

Threading: If the valve has threaded components, the threads should be precise and free of defects.

Sealing Surfaces: The sealing surfaces of the valve should be flat and parallel to ensure a proper seal.

Housing Integrity: The housing of the valve should be free of cracks or other defects that could compromise its integrity.

Component Alignment: The components of the valve, such as the stem and disc, should be aligned properly to ensure smooth operation.

Material Properties: The material properties of the check valve casting, such as hardness and tensile strength, should meet the specified requirements.

What Are Some Common Methods for Achieving a Good Surface Finish on Check Valve Castings?

01/

Grinding And Polishing: This involves using abrasive tools to remove any roughness or imperfections from the surface of the casting.

02/

Sandblasting: Sandblasting can be used to remove rust, scale, and other surface contaminants, leaving a smooth surface.

03/

Electroplating: Electroplating involves coating the surface of the casting with a thin layer of metal, such as zinc or nickel, to improve its appearance and corrosion resistance.

04/

Anodizing: Anodizing is a process that creates a protective oxide layer on the surface of aluminum castings, improving their durability and appearance.

05/

Painting Or Coating: Applying a paint or coating can provide a decorative and protective finish.

06/

Machining: Precision machining techniques, such as milling or turning, can be used to achieve a specific surface finish.

Use of Check Valve Casting

Check valve castings are used in a variety of applications to control the flow of fluids in piping systems. Some common uses include:

Fluid control

Check valves are used to prevent backflow of fluids, allowing them to flow in one direction only. This is important in systems where reverse flow could cause damage or malfunction.

30inch 150bl WCB Check Valve Body Casting

Pumping systems

In pumping systems, check valves are installed to prevent fluid from flowing back into the pump when it is not in operation, protecting the pump from damage.

Hydraulic and pneumatic systems

Check valves are used in hydraulic and pneumatic systems to control the direction of fluid flow and prevent reverse flow.

Heating and cooling systems

In heating and cooling systems, check valves are used to prevent the backflow of hot or cold water, ensuring efficient operation.

Industrial processes

Check valves are employed in various industrial processes, such as chemical processing, oil and gas production, and food and beverage manufacturing, to control fluid flow and protect equipment.

12 Inch 2500bl WCB Top Entry Ball Valve Bady Castings

Plumbing systems

In plumbing, check valves are used to prevent backflow into potable water supplies, ensuring water quality and safety.

How to Choose Check Valve Casting?

Flow Rate And Pressure: Make sure the check valve can handle the expected flow rate and pressure of the system.

Fluid Type: The valve should be compatible with the fluid being used, considering its properties such as viscosity, corrosiveness, and temperature.

Operating Temperature: The valve should be able to withstand the temperature range of the fluid.

Material And Corrosion Resistance: Select a valve made from a suitable material that offers corrosion resistance for the specific application.

Seal Type: The seal of the check valve is important for preventing leaks. Consider the type of seal and its durability.

Installation Type And Compatibility: Determine the appropriate installation method (such as threaded, flanged, or welded) and ensure compatibility with the existing piping system.

Size And Dimensions: Choose a valve that fits the pipe diameter and connection requirements of the system.

Quality And Reliability: Look for a reputable manufacturer and consider reviews or references to ensure the valve's quality and reliability.

Cost And Availability: Consider the cost of the valve and its availability in the market.

The Life Expectancy of a Check Valve Casting

The life expectancy of a Check Valve Casting can vary depending on several factors, including the quality of the valve, the operating conditions, the frequency of use, and the maintenance it receives. Generally, well-manufactured check valves can last for many years under normal operating conditions. However, there are a few things that can affect the lifespan of a Check Valve Casting:

Operating conditions

High pressures, extreme temperatures, or corrosive fluids can put more stress on the valve and potentially shorten its lifespan.

Maintenance and servicing

Regular inspection, cleaning, and lubrication of the valve can extend its useful life.

Quality of the valve

Higher-quality valves are typically more durable and likely to have a longer lifespan.

Installation and operation

Proper installation and operation of the valve can also impact its longevity.

How Often Should I Clean My Check Valve Casting?

The frequency of cleaning your check valve casting depends on several factors, such as the operating conditions, the type of fluid being used, and the specific requirements of your system. Here are some general guidelines:

● Regular Inspection: Periodic visual inspections of the check valve casting can help you determine if cleaning is needed. Look for signs of dirt, debris, or buildup on the surface.

● System Demands: If the fluid being handled is prone to contamination or the operating conditions are harsh, more frequent cleaning may be necessary.

● Flow Performance: If you notice a decrease in the valve's performance or observe any leaks, it could be an indication that cleaning is required.

● Manufacturer's Recommendations: Refer to the manufacturer's guidelines or documentation for specific recommendations on cleaning frequency.

In general, it's a good practice to clean the check valve casting at least annually or as needed based on your observations and system requirements. However, some applications may require more frequent cleaning depending on the nature of the fluid and the operating environment.It's important to note that proper maintenance and cleaning not only extend the lifespan of the valve but also ensure its proper functioning.

The Common Cleaning Methods for Check Valve Casting

Manual cleaning

Use a brush, cloth, or sponge to remove dirt, debris, and contaminants from the surface of the casting. This can be done with mild detergents or cleaning solutions.

Pressure washing

Use a pressure washer to spray high-pressure water onto the check valve casting to remove stubborn dirt and debris.

Ultrasonic cleaning

Ultrasonic cleaning uses high-frequency sound waves to create tiny bubbles that remove contaminants from the surface of the casting. This method is often used for delicate or intricate castings.

Steam cleaning

Steam cleaning uses hot steam to dissolve and remove dirt and contaminants. It can be effective for cleaning hard-to-reach areas.

Chemical cleaning

Depending on the nature of the contaminants, specific chemical cleaning agents may be used to dissolve or remove them.

Abrasive blasting

Abrasive blasting involves using sand, glass beads, or other media to remove rust, scale, or coatings from the casting.

Our Factory

Kaigao Industrial Technology Co., Ltd was established in 2020 with the following investors: Kaifeng High and Middle Pressure Valve Co.,Ltd. Kaifeng Dongli High Pressure Valve Casting Co., Ltd. and Kaifeng Ruiwei Fluid Technology Service Co. The main business includes sales of industrial valves and castings produced in three factories.

Video

Ultimate FAQ Guide to Check Valve Casting

Q: What is the k value of a check valve casting?

A: The k-value provided by the check valve casting, also known as a k factor or loss coefficient, allows for the calculation of pressure loss through the valve. This applies to a particular fluid, flowing at a specified velocity.

Q: What does cracking pressure mean on a check valve casting?

A: Cracking pressure is the minimum upstream pressure required to open a check valve casting enough to allow detectable flow. Detectable flow is when the check valve allows a small but steady flow of liquid or gas to pass through the valve body and out through its outlet port.

Q: What is the forward velocity to close a check valve casting?

A: Forward velocity to close valve - by default this value is zero. Some valves are designed to start closing at some reverse velocity - you can specify that here as a negative value. Entering a positive value in this field would imply that the check valve closes while the flow is still continuing forward.

Q: How do you know when a check valve casting is bad?

A: The signs of a failing swing check valve casting are often audible. When the disc opens and closes repeatedly (because of low-pressure flow) or violently (because of water hammer), it emits a tapping or hammering sound, respectively.

Q: How much pressure is needed to open a check valve casting?

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

Q: What causes a check valve casting to go bad?

A: Common check valve casting problems include noise (water hammer), vibration/chattering, reverse flow, sticking, leakage, missing internals, component wear or damage. However, it is worth mentioning that normally the real cause is the wrong size, spring, and/or style for the check valve casting application.

Q: Where should a check valve casting be installed?

A: The recommendation by manufacturers standardization society of the valve and fittings industry (mss sp- 92) is to install a check valve at a minimum of 10 pipe diameters of straight pipe on the downstream side from tees, fittings, increasers or pumps and five pipe diameters from elbows to ensure laminar flow with minimum turbulence to minimize disc movement and premature wear.

Q: When should a check valve casting be installed?

A: Check valves are necessary if there is a risk of condensate backflow. For example, when a trap discharges into a common condensate collection line, there is the potential risk of backflow from condensate discharged from other traps, so as a rule a check valve should be installed.

Q: Does a check valve casting prevent backflow?

A: Check valves, also referred to as backflow preventers, are used in sanitary and building faucets of drinking water installations. They keep the pipework free of unwanted backflow, back pressure or back siphonage of used water, and protect the drinking water system from contamination according to din en 13959.

Q: What happens if you don't have a check valve casting?

A: Without a check valve casting, water can flow back into the sump pit every time the pump shuts off, which can cause the pump to run more frequently and for longer periods of time. This can lead to increased wear and tear on the pump, and can also cause the pump to overheat and fail prematurely.

Q: How do you inspect a check valve casting?

A: Disassemble the valve to gain access to its internal components. Inspect the check valve's disc, seat, spring, and any other internal components. Look for signs of wear, damage, or debris that may be causing the leak. Identify why the check valve is leaking.

Q: How much pressure is needed to open a check valve casting?

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: What is the purpose of a check valve casting?

A: A check valve, also known as a non-return valve or one-way valve, allows the fluid to flow in only one direction. It is designed to prevent backflow, the reverse flow of fluids in a pipeline, and ensure the unidirectional fluid flow in the piping system.

Q: What are the three basic design of check valve castings?

A: Check valves are unidirectional valves that provide unobstructed flow in one direction as long as flow pressure remains constant and protect the piping system against reverse flow. The three main types of check valves we offer are ball, piston, and stop check valves.

Q: Which of the following is the main purpose of the check valve casting?

A: The primary function of a check valve performs in a system is to prevent backflow. The onset of backflow could be detrimental to industrial systems in several ways. For example, backflow causes the impellers of pumps and compressors to reverse, which may cause burnout.

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

A: 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.

Q: What is the most common application for a check valve casting?

A: The most common application of the check valve casting is on suspended loads. A standard closed center directional valve will allow a cylinder to drift down because of leakage between the valve spool and housing. The pilot operated check valve has little or no leakage.

Q: Can you pressure test against a check valve casting?

A: Check valve castings are tested at an air pressure of no less than 80 psi. 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.

Q: What is the procedure of checking valves?

A: The valve shall be partially open and be able to hold pressure for a certain time. The pressure shall not be less than 1.5 times of maximum working pressure. No leakage is allowed. Leakage check points are body, bonnet, stem, plugs/fittings and flange connections.

Q: Does it matter if a check valve casting is horizontal or vertical?

A: Not all styles of check valve castings function properly or are suitable for vertical flow directions. When installing a check valve casting, a horizontal line is always preferred, because it takes gravity out of the equation. However, in real-world applications, the ideal situation is not always available.

As one of the most professional check valve casting manufacturers and suppliers in China, we're featured by quality products and good price. Please rest assured to buy high-grade check valve casting from our factory. hydraulic valve 3 way, flow control gate valve, pvc gate valve 6 inch