PORO:Your Professional Check Valve Manufacturer!

 

Zhejiang PORO Valve Manufacturing Co., Ltd , established in 1997 with oversea's investment, covered an area of 23186 square meters, is a leading manufacturer & sales in China. Today PORO valve has been widely used in domestic and international large-scale petroleum, chemical, electric power, iron and steel, shipbuilding, water treatment and other fields.

 

 
  • Lift Type Check Valve
    The Lift Type Check Valve is a common valve type, mainly used to prevent the medium from flowing back in the pipeline and ensure the one-way flow of the fluid.
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  • Swing Type Check Valve
    The swing type check valve is a common valve type, which is mainly used to prevent the reverse flow of fluid in the pipeline, ensure the unidirectional flow of the medium, and thus protect the safe operation of the pipeline system and...
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  • Dul-Plate Wafer Type Check Valve
    The dul-plate wafer type check valve is a compact check valve, which is mainly used to prevent the reverse flow of the medium in the pipeline. It has a light structure and is easy to install. It is widely used in the petroleum,...
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  • Single Plate Wafer Type Check Valve
    The single plate wafer type check valve is a check valve with a simple structure and easy installation. It is mainly used to prevent the reverse flow of the medium in the pipeline. Its design is compact and suitable for occasions with...
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  • Axial Flow Check Valve
    Axial flow check valve is a high-efficiency, low-resistance check valve, mainly used to prevent the reverse flow of media in pipelines. Its unique design enables it to perform well in high-pressure and high-flow situations.
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  • Butterfly Check Valve
    The butterfly check valve is an automatic valve, mainly used to prevent the backflow of the medium and ensure one-way flow. It has a simple structure, small size and light weight, and is widely used in water treatment, petrochemical,...
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Why Choose Us
 
 
 

Our Product

Gate valve, Globe valve, Check valve, Ball valve, Butterfly valve and slab gate valve etc. are our products range covered different materials of CS, LTCS, SS, DSS, ALLOY S etc. and standards of ANSI, DIN, BS, JIS, and GB etc.

 
 

Quality Assurance

We have 100% quality guarantee to customers. We will be responsible for any quality problem.

 
 

Production Market

PORO's products are exported to ASEAN, Europe, South America, Middle East, Africa and so on. In the past, the annual business volume was as high as 40 million RMB.

 
 

Rich Experience

Since the establishment of the company, we have focused on production. Our company has many years of production work experience. The concept of customer-oriented and win-win cooperation makes the company more mature and stronger.

 

 

Lift Type Check Valve

 

Advantages of Check Valve

Prevention of Backflow: The primary function of check valves is to prevent backflow, which can cause damage, contamination, or interference with the intended flow direction.

 

Protection of Equipment: By preventing reverse flow, check valves safeguard pumps, compressors, and other equipment from potential damage.

 

Automatic Operation: Check valves operate automatically without the need for external control, making them easy to use and reliable.

 

Minimal Maintenance: Due to their simple design and operation, check valves typically require minimal maintenance, reducing downtime and operational costs.

 

Compact Design: Check valves are generally compact, making them suitable for installation in systems with limited space.

 

Technical Parameters

 

Nominal diameter (DN):

DN15-DN600 (customizable according to needs)

Pressure level (PN):

PN10-PN160 (or higher pressure level)

Applicable temperature:

-20°C to 550°C (depending on the material)

Valve body material:

Cast iron, carbon steel, stainless steel, alloy steel, etc.

Sealing material:

Metal seal, rubber, polytetrafluoroethylene (PTFE), etc.

Connection method:

Flange connection, threaded connection, butt welding connection, etc.

 

Application of Check Valve
2(001)
Swing Type Check Valve
2(001)
Butterfly Check Valve

Water and Wastewater Treatment:
In water and wastewater treatment plants, check valves are preventing backflow, thus, they are ensuring the quality of the drinking water and that the contaminated water doesn’t get into the clean system. They are integral parts of water disinfection systems, pump stations, and sludge treatment.

 

Oil and Gas Industry:
The oil and gas industry is highly dependent on check valves to regulate the movement of oil, natural gas, and byproducts through pipelines and equipment. These units make sure the hazardous and corrosive fluids are not backflowing, which can cause leaks or explosions.

 

Chemical Manufacturing:
Check valves in the chemical manufacturing industry are indispensable for the proper flow direction of any chemicals used during processing. They are crucial for system integrity preserving by preventing the mixing of incompatible chemicals and the damaging of sensitive devices from the reverse flow.

 

Power Generation:
In power plants, especially the ones using steam turbines, check valves are of great importance as they control the flow of steam and the cooling water. They make sure that boilers, condensers, and heat exchangers run well.

 

HVAC Systems:
HVAC systems apply check valves to regulate the flow of heating or cooling medium (generally water or refrigerant) in the system. These valves are the key components that prevent the reverse flow which causes inefficiencies or damages the system components.

 

Microfluidics:
In microfluidics, check valves can be miniaturized to control the flow of fluids in micro-channels, which allows for the precise control and manipulation of small volumes of liquids. Such is relevant in drug discovery, point-of-care diagnostics, and lab-on-a-chip devices.

 

Aerospace:
Check valves are very important in aerospace applications, such as fuel systems, hydraulic systems, and environmental control systems. In these applications, check valves must operate under extreme force and within gas lines at high altitudes with minimal pressure loss.

 

Automotive Industry:
In vehicles, check valves are used in various systems, such as braking systems and emission control systems, to control the flow of fluids and gases. This ensures the smooth operation of these critical systems, reducing the need for frequent maintenance and improving fuel efficiency.

 

Marine Applications:
Check valves are employed in marine systems to control the flow of water, fuel, and other fluids, preventing backflow that could compromise the operation of the vessel. This enhances the efficiency and safety of marine operations by maintaining proper fluid flow.

 

Agriculture:
Agricultural irrigation systems often utilize check valves to control the flow of water and prevent backflow, ensuring efficient water distribution. This helps in conserving water and reducing the energy required for pumping.

 

Food and Beverage Processing:
In the food and beverage industry, check valves help control the flow of liquids during processing, preventing contamination and ensuring product quality. This contributes to efficient production processes and reduces the risk of costly recalls.

 

Types of Check Valve
 

Ball check valves: These valves use a ball that sits on a seat to allow fluid to flow in one direction but prevent backflow when the fluid flows in the opposite direction.

 

Inline check valves (Globe-Style Sliding Disc Check Valve): These valves are installed within the piping system and use a spring-loaded disc to allow fluid to flow in one direction and prevent backflow when fluid flows in the opposite direction.

 

Swing check valves (Butterfly Check Valve) : These valves use a swinging disc to allow fluid to flow in one direction and prevent backflow when fluid flows in the opposite direction.

Swing Type Check Valve

 

Axial Flow Check Valve

Lift check valves: These valves use a piston or ball to lift off the seat, allowing fluid to flow in one direction but preventing backflow when the fluid flows in the opposite direction.

 

Tilting disc check valves: These valves use a tilting disc to allow fluid to flow in one direction and prevent backflow when fluid flows in the opposite direction.

 

Wafer check valves: These valves are installed between flanges and use a spring-loaded disc to allow fluid to flow in one direction and prevent backflow when fluid flows in the opposite direction.

 

Components of Check Valve

Body: The main structure of the valve, which houses the internal components and provides the pathway for fluid flow. It is typically made of metal or plastic, depending on the application.

Seat: The surface within the valve body against which the closing mechanism (disc, ball, or diaphragm) seals to stop reverse flow. The seat must be precisely machined to ensure a tight seal.

Disc/Clapper, Ball, or Diaphragm: The moving part that opens to allow forward flow and closes to prevent backflow.

Disc / Clapper: In swing check and lift check valves, a disc pivots or lifts to allow flow.

Ball: In ball check valves, a ball moves away from the seat to permit flow and returns to the seat to block reverse flow.

Disc / Piston: Uses a spring and disc in the center of the bore with flow passes around the disc. When flow drops the spring energizes and pushes the disc closed.

Diaphragm: In diaphragm check valves, a flexible diaphragm moves to open or close the flow path.

Hinge or Guide: In swing check valves, a hinge pin allows the disc to pivot. In lift check valves, guides or cages keep the disc aligned and allow it to move up and down.

Spring (in some designs): Some check valves, such as spring-loaded check valves, incorporate a spring to help close the disc or ball more quickly when flow stops or reverses, providing a quicker response to prevent backflow.

Cover (or Cap): The cover or cap is a removable part of the valve body that allows access to internal components for maintenance and inspection.

Seal or Gasket: A seal or gasket is used between the body and the cover to ensure a leak-tight connection.

End Connections: These are the points at which the valve connects to the piping system. Common end connections include threaded, flanged, or welded ends.

 

Packaging and Shipping

 

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Our Certificates

 

productcate-572-787

 

FAQ

 

Q: What is the structure of a check valve?

A: Check valves vary according to the flow rate, media gravity and temperature, line size, pressure, and velocity of the flow, which can be seen in the chart below. A basic check valve has four individual parts: body, seat, disc, and cover. There are endless varieties of check valves to fit multiple applications.

Q: What are the symptoms of a bad check valve?

A: Symptoms of a failing check valve can include leaks, unusual noises, pressure fluctuations, reduced flow rates, and in some cases, reverse flow. Other signs can include visual indicators like corrosion or debris accumulation, and inconsistent valve operation.

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

A: A check valve is a simple device that prevents reverse flow, while a backflow preventer offers more comprehensive protection by including additional mechanisms to prevent contamination and release or divert contaminated water in case of failure. Check valves are one-way valves that close to prevent reverse flow, whereas backflow preventers have fail-safes to ensure water remains safe even if the valve malfunctions.

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

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: Should check valve be horizontal or vertical?

A: Check valves can be installed both horizontally and vertically, but the best orientation depends on the type of check valve and the flow direction. For example, swing check valves are generally preferred in horizontal lines with the hinge pin positioned horizontally above the centerline of the pipe. Vertical flow, especially downward, can be problematic for swing check valves, and axial flow (silent) check valves are often better suited for these applications.

Q: Can I repair a check valve?

A: If there is damage to the valve's body, such as severe rust or corrosion, the valve needs to be replaced. However, if damage or wear is only found on internal parts, it's possible to replace the parts rather than the entire valve.

Q: Where is the best place to install a check valve?

A: Proper check valve installation position is very important for the proper operation of the piping system. Check valves should be installed at the beginning of pipelines, at the outlet of pumps or pressure sources, and at high and low points in elevated and horizontal pipelines.

As one of the leading check valve manufacturers and suppliers in China, we warmly welcome you to buy high quality check valve made in China here from our factory. For customized service, contact us now.

Dul Plate Wafer Type Check Valve, Lift Type Check Valve, Single Plate Wafer Type Check Valve
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