Check Valves

We at SIO produce check valves made from materials with the highest quality. Commonly known as one-way valves, check valves are made primarily to block backflow and to protect compressors and pumps. They are common in various industries and applications including natural gas, mining, and municipal water.

Their main parts include a cover, body, seat ring, disk, and a hinge pin. They come in different types, like the swing type, lift type, dual plate type, and the stop check valve.

The fluid pressure that goes through the pipeline will open the valve. Meanwhile, any backflow will shut the valve. Check valves will promote smooth flow and will shut automatically as pressure declines.

SIO will assure you that we will both produce and configure your check valves in the most efficient manner.

    Check valves Manufacturer

    SIO manufactures quality check valves, also known as a one-way valve, clack valve, and non-return valve (NRV). It is one of the most commonly used valves in various industrial applications. The purpose of a check valve is to prevent flow from going back into the system (backflow).

    The main advantage of a check valve is its operation is self-automated. The mechanism of this valve prevents damage to other equipment, contamination, and other potential problems on the upstream line. A check valve is found in an array of industrial applications, including injection lines, boilers, cooling towers, water and wastewater treatment facilities, washdown systems, and so much more.

    You can also buy a customized electrical check valve. Let’s discuss all the different types of check valves produced by SIO.

    Stainless Steel Valve

    Check Valves Features

    Design and flange end

    SIO check valves’ basic design complies with ANSI B16.34/ API 603. The flange end complies with ASME/ANSI B16.5.

    Testing standard

    All SIO check valves are tested and inspected according to the industrial standards- ANSI B16.34/ API 598

    Temperature tolerance

    SIO high temperature check valve has great temperature tolerance. It can bear as high as 425ºC and can also work below 0ºC.


    Check valves from SIO are made from durable and corrosion-resistant materials such as bronze, stainless steel, cast steel, etc.

    Benefits of using Check Valves/ why use Check Valves


    Backflow prevention

    Check valves are generally used in industries to prevent backflow. Because of their ability to be used in both horizontal and vertical directions, they are suitable for most applications.


    Check valves to prevent pumps and compressors from being damaged by backflow. It also prevents water hammers. It happens if an open valve is suddenly closed, the water slams into it. As a result, the pump suddenly stops and reverses the flow back to the pump.

    Energy efficient

    Check valves do not require power to operate, however, they can be used with an automatic actuator making them an electrical check valve.

    Standard and specification of Check Valves

    Non-slamming Features

    When it comes to non-slamming features, there are two things to consider. In the first step, you must determine how long a check valve will take to close. As a next step, you must consider how the disc shifts from an open position to a closed one.

    Head Loss Features

    Each check valve causes a head loss. An obstruction to a process fluid and the presence of fluid viscosity can cause a drop in head loss. As a result, pumps will use more energy. To reduce head loss, choose the right design for the check valve.

    Common Check Valve Applications

    Industrial Processes

    Many industrial applications require the use of check valves. They are used extensively in machines used in chemical plants, the power processing plants , and other industrial processes. Check valves are commonly used in the nuclear industry for water control systems, dump lines, sampling and monitoring systems, N2 systems, make-up water, and other process systems. Check valves are used in aerospace and aircraft operations in areas with high temperatures, aggressive fluids, and high vibrations.


    Certain types of pumps also use check valves. Pumps that use pistons and diaphragms, such as metering pumps and chromatography pumps, usually have ball check valves. A check valve is also used to prevent backflow in various types of machinery that use a similar mechanism to these pumps.


    In pipelines , check valves provide assurance that the final product will be as it should be. The media commonly used in these pipelines are crude oil and natural gas. A check valve is located in the upstream, midstream, and downstream sections. This prevents any backflow or contamination from adversely affecting the flow media.

    Oil and Gas Industries

    In order to meet rising oil and gas demand, deeper wells, longer pipelines, and even cheaper production costs are necessary. The valves keep operations running smoothly. In addition, preventing backflow and contamination prolongs the valve's service life. A check valve used in the oil and gas industry must be capable of handling extremely high pressures, temperatures, and low pressures.

    Chemical Processing and Biopharm Industries

    Industries such as biopharma and chemical processes require sterile check valves. These processes transform raw materials into finished goods. As heat and pressure are often used in these industries, the media might be toxic, corrosive, and abrasive. These media require high tolerance in check valves. Additionally, they should ensure tight sealing to avoid cross-contamination and backflow.

    Food and Beverage Industries

    The food and beverage industry is one of the fastest-growing industries in the world today. Due to this, these industries are in need of reliable and strong check valves in their plants. A check valve in these industries can be divided into two categories, valves in contact with materials and those in use with utilities, such as steam and water.

    Marine Industries

    The marine industry relies heavily on industrial valves. Check valves are used in ships where liquid cargo is stored and transported. Their job is to ensure that liquid flows in one direction. To guard against contamination and other issues, the flow should not go in any other direction. Since resources are limited and not readily available at sea, marine industries require check valves to be durable and reliable.

    Wastewater Treatment Plants

    It is difficult and expensive to dispose of wastewater from industrial plants. These facilities use check valves for several reasons. A check valve acts as a preventative measure against backflow from treated water. The valves also help reduce contamination risks. Check valves can also protect against sudden pressure surges, such as water hammers.

    Check valve factory

    Cast steel check valve

    SIO is the best check valves manufacturer in China because it does not compromise the quality of the products. We have retained our customers’ trust for more than two decades and will keep continuing that.

    The machines that we use are high-precision automated mechanisms, such as machining centers, CNC lathes, CNC mills, and other processing equipment, which achieve the highest levels of synchronization currently available.

    We ship worldwide as well, so if you want to try our services from any corner of the world, we are there at your service.

    What Are the Different Types of Check Valves?

    Check Valves by Materials

    Brass Check Valve

    Brass Check Valve

    The Brass Check Valve is highly corrosion resistant. As a result, it can handle different corrosive fluids as well as chemicals. This type of check valve is also well suited for high temperatures due to its excellent ductility.

    Stainless Steel Check Valve

    Stainless Steel Check Valve

    Stainless steel check valves are durable and designed to work under different conditions. This allows it to prevent backflow in aggressive and corrosive media. The material is also commonly used in applications involving high temperatures and pressures.


    Forged Steel Check Valve

    A forged check valve is ideal for applications with temperatures and high pressures. This helps improve the valve's overall strength. Another advantage of the forging of steel is that it produces a check valve with a reduced wall thickness.

    Cast Steel Check Valve

    Specifically, a cast steel check valve is one that is made from cast steel. Among the benefits of casting steel is its ability to produce check valves with unique shapes and sizes.

    Cast Iron Valve

    Cast Iron Check Valve

    Cast iron check valves are extremely wear-resistant and vibration dampening. Their corrosion resistance is also excellent. These features make this type of check valve ideal for use in a variety of industrial applications, such as water lines, sewage systems, and utility systems.


    Ductile Iron Check Valve

    The ductility of ductile iron is what makes it resistant to breaking when flexed. It is capable of withstanding high temperatures as well as high pressure. Check valves made from ductile iron are robust, tough, and have a high degree of heat resistance.

    Bronze Check Valves

    Bronze Check Valve

    Bronze check valves are made from bronze. In addition to their enhanced strength, bronze check valves are also very machinable, corrosion-resistant, and wear-resistant. This type of check valve is commonly used in services with low and medium pressures.

    Check Valves by Disc Design

    Ball Check Valve

    Ball Check Valve

    Due to its small size and simplicity, ball check valve is relatively low-cost and doesn't require as much maintenance. Valve bodies are made of forged steel, cast steel, or other materials. This ensures their performance for an extended time.


    Swing Check Valve / Butterfly Check Valve

    Swing check valves, also known as butterfly check valves, are used to prevent reverse flow or permit forward flow. To control media flow, it consists of a movable disc attached to a hinge or trunnion.


    Lift Check Valve / Globe Check Valve

    Lift check valves have a similar seat design with globe valve.They are suitable for applications where high pressures and high velocities are present. It is used in petrochemical, chemical treatment, agricultural, food and beverage processing, and so on.


    Diaphragm Check Valve

    Diaphragm check valves contain either a rubber diaphragm or a self-centering disc. A certain amount of upstream pressure should exceed downstream pressure in this valve. Pressure differential enables the check valve to open and allow flow.

    Tilting Disc Check Valve

    Tilting Disc Check Valve

    Tilting disc check valves consist of a disc with a pivot point located in their center. Pump protection is ideal with a tilting disc check valve since it has a quick-acting closure. It is used for gas and liquid handling applications.

    Check Valves by Media Type

    Liquid Check Valve

    Liquid Check Valve

    Liquid check valves are intended to handle different types of liquids. Its performance depends on factors such as velocity, density, and viscosity. The WOG symbol on a check valve indicates that it can handle water, oil, and gas.


    Gas Check Valve

    It is specifically designed for use in gas transmission applications such as compressor discharge. Gas check valves are also used for hydraulic lines, compressor intake and outlet, metering pumps, airlines, pressure letdown, and pump discharge, among other applications.


    Steam Check Valve

    The steam check valve is used in industrial and chemical processes that involve steam and condensate. Many industrial processes rely on steam. However, it produces condensate that must be immediately removed from the steam line. The valve prevents reverse flow and ensures that the condensate is removed completely.

    Check Valves by Application


    High-pressure Check Valve

    High-pressure check valves are designed to handle demanding industrial applications. This check valve can withstand high pressure, high temperatures and corrosive media. It is used in hydrocarbon processing, natural gas plants, as well as wastewater treatment.

    High-temperature Check Valve

    High temperature Check Valve

    High temperature check valves are designed to handle environments up to 425°C. They can also handle temperatures below 0°C. A high-temperature check valve is commonly used in steam plants, process plants, and boiler plants.


    Cryogenic Check Valve

    Cryogenic check valves are designed to withstand extremely cold temperatures, up to -196°C. To handle cryogenic fuels, such as liquid oxygen and liquid hydrogen, cryogenic check valves are widely used. In addition, it is used in liquefied gases.


    Vacuum Check Valve

    The vacuum check valve controls vacuum levels by providing a tight seal in a venturi vacuum pump. There should be no cracking pressure greater than 1" Hg on an ideal vacuum check valve. Consequently, the valve can maintain a higher vacuum level.

    Sanitary Check Valve

    Sanitary Check Valve

    Sanitary check valves are specifically designed for pharmaceutical applications and are also called chemical check valves. The main purpose of this check valve is to prevent reverse flow and cross-contamination.

    Check Valves by Connection


    Socket Weld Check Valve

    A socket weld check valve is suitable for high pressures and temperatures applications, ensuring leak-proof sealing under even the most extreme conditions. They are used in industries like oil and gas, pulp and paper, and chemicals.

    Everflow 210T034-NL 3/4-Inch Lead Free Brass Swing Check Valve with Female NPT Threaded

    Threaded Check Valve

    A threaded check valve is an industrial check valve that has threaded connections on the ends. Generally, threaded connections are used to seal tightly at low pressures and temperatures. It is also used in applications with minimal vibrations.


    Butt Weld Check Valve

    Steel check valves are commonly equipped with this connection because of their strength. A butt weld check valve is ideal for applications involving extreme pressures and temperatures.

    Compression-Fitting valve

    Compression Fitting Check Valve

    Compression fitting check valves are generally used on steel and copper pipes. This valve is used in low-pressure applications or when disassembly of the pipeline is not required frequently.


    Flanged End Check Valve

    Flanged end check valves are made with flanges on their ends. Flanged connections are the easiest type of connection to install and remove from a pipe. Furthermore, it is the most common connection for valves, especially those which are frequently removed and reinstalled.

    Check Valves by Body Design


    Angle Check Valve

    The angle check valve allows viscous fluids, such as slurry, to pass through it easily. Additionally, it helps to prevent fluid cavitation and flashing from damaging the check valve. Angle check valves are commonly used in high temp application.

    Y Check Valve

    Wye Check Valve / Y-Check Valve

    Commonly referred to as Y-check valves, they allow one-way flow in compressed air or liquid systems. It can be used in a variety of media, including seawater, condensate, fuel oil, boiler feedwater, freshwater, cargo oil, lubricating oil, flammable, non-flammable hydraulic fluid, etc.


    Wafer Check Valve / Dual-plate Check Valve

    The slim design of a wafer check valve significantly reduces the chances of clogging. It is used in chemical processing, mining, power plants, bleach plants, tank inlets and outlets, and water treatment plants.

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