Established in 2008 with a registered capital of RMB 5 million, GNEE Group is a leading international supplier specialising in the manufacture and distribution of high quality valves and fittings for a wide range of industrial applications including water supply, sewage systems, oil and gas, and marine treatment.
Why choose us
Our Products
GNEE Group specializing in the manufacture and distribution of high quality valves and fittings for a wide range of industrial applications including water supply, sewage systems, oil and gas, and marine treatment.
Sales Market
GNEE valves have been exported to more than 160 countries around the world, and every year more than 50 customers visit the GNEE Group and order more than 30,000 pieces of valves.
Our Team
Established in 2008 with a registered capital of RMB 5 million, GNEE Group At present, the company has a total investment of 30 million yuan, a plant area of more than 35,000 square meters and more than 200 employees.
Customer Service
GNEE Group always puts product quality and customer needs first, and strives to provide better services to each of our customers. We follow the latest standards and focus on management, technology and process innovation. With a mature sales service system, GNEE Group insists on providing one-stop service to every customer.
The following table provides a quick overview of the key features and applications of different check valve types:
|
Type |
Design |
Size Range |
Common Materials |
Media |
Temperature Range |
Main Applications |
|
Ball Check Valves |
Ball blocks reverse flow |
1/4″ to 12″ or larger |
Stainless steel, brass, synthetic rubber |
Water, oil, chemicals |
-20°F to 400°F |
General fluid transport |
|
Swing Check Valves |
Hinged disc for high-volume flow |
2″ to 36″ or larger |
Ductile iron, stainless steel |
Water, steam, gases |
Up to 750°F |
Water supply, irrigation, industrial pipes |
|
Silent Check Valves |
Spring-loaded disc minimizes water hammer |
2″ to 24″ |
Stainless steel, bronze |
Clean water, aggressive fluids |
Up to 400°F |
Water treatment, pumping stations |
|
Lift Check Valves |
Piston or disc lifts for flow control |
1/4″ to 4″ |
Forged steel, stainless steel |
Hydraulic fluids, steam |
Up to 1000°F and 10,000 PSI |
High-pressure industrial processes |
How does a check valve work
Cracking pressure
A check valve requires a minimum pressure differential between the inlet and outlet to open, allowing media to flow through it. This minimum upstream pressure at which the valve opens is called the check valve's cracking pressure. The specific cracking pressure changes based on the valve design and size, so ensure that the system's pressure can generate the cracking pressure of the chosen check valve(s).
Closing
If the upstream pressure falls below the cracking pressure or there is back pressure (flow attempting to move from the outlet to the inlet), the one way check valve will close. Typically, check valves have a gate, ball, diaphragm, or disc pressed against a seal to close the valve and block flow. Gravity or a spring can assist in the closing process.
Installation orientation
As a one-way valve only allows flow in one direction, knowing the correct installation orientation is crucial. Typically, an arrow on the valve's housing (Figure 3) indicates the flow direction. If there isn't an arrow, examine the valve to ensure it is installed in the intended flow direction. If the valve is installed backward, the media cannot move through the system, and the resulting pressure build-up can cause damage.
Prevents Backflow: The primary function of a check valve is to prevent the backflow of fluids in a piping system. It ensures that the flow of fluid occurs in one direction only, effectively blocking reverse flow. This is especially important in situations where backflow could cause damage, contamination, or interference with the intended flow direction.
Protects Equipment and Systems: Check valves help safeguard equipment and systems by preventing potential damage caused by reverse flow. They act as a barrier, preventing fluids from flowing back and causing issues such as pump damage, pipe collapse, water hammer, or contamination of sensitive components.
Maintains Pressure: Check valves assist in maintaining optimal pressure levels within a system. By allowing fluid to flow in the desired direction and preventing backflow, they help maintain the desired pressure conditions, ensuring efficient operation of pumps, regulators, and other pressure-sensitive equipment.
Enhances System Efficiency: Check valves contribute to the overall efficiency of a system. By preventing reverse flow, they eliminate the need for additional pumps or mechanisms to counteract backflow, thereby reducing energy consumption and operational costs.
Minimizes Water Hammer: Water hammer, characterized by sudden pressure surges or shockwaves in a system, can lead to pipe damage and system failure. Check valves help mitigate water hammer by preventing reverse flow and the subsequent pressure spikes that can occur.
Allows for System Isolation and Maintenance: Check valves provide a means of isolating sections of a system for maintenance or repairs. By closing off the valve, the flow of fluids can be stopped in a specific direction, allowing for safe and efficient maintenance procedures.
Materials of Check Valve
Brass
A brass check valve is usually found in low-pressure applications. It has great durability and works excellent for water, oil, and fuels. However, brass is less resistant to corrosion, heath, seawater.
PVC
Polyvinyl chloride material is often used in check valves in water management and irrigation systems because of its resistance to acids, chloride solutions, seawater, and other corrosive fluids. PVC shouldn’t be used for chlorinated hydrocarbons and other fluids with high temperatures (over 60 degrees Celsius).
Polypropylene
Polypropylene material has strong corrosion resistance, making them great for inorganic acids, aqueous solutions, and other media that can corrode metals. You can use them for aggressive fluids, water, and liquid food applications.
Stainless Steel
Stainless steel and titan check valves have excellent resistance to low and high temperatures, as well as corrosion. On the downside, this material is more expensive than other solutions.
Maintenance Tips
Regular Inspections
Inspect the valve from time to time to ascertain that there is no wear and tear, corrosion or leakage. It is always easier to address problems when they are still small than when they have become big problems.
Clean the Valve
If for some reason the valve is covered by debris or sediment, then it is necessary to disassemble and clean to maintain the free passage of a fluid. Cleaning is also important to ensure that blockage develops don’t affect the efficiency of the system.
Test Functionality
Check when the valve is opened and closed from time to time. This is especially crucial in valves that are used in services that need the valve to work as required to avoid a catastrophic event.
Check Seals and Gaskets
Check other components such as seals and gasket to determine when they will require replacement. They should be replaced when necessary so that the seal will not leak or have any other problems on the whole.
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FAQ
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