Gnee steel group is a supply chain integrated enterprise including steel plate, coil, profile, outdoor landscape design and processing. Founded in 2008, with 5 million RMB registered capital, Gnee has made impressive progress and development in steel market with Gnee People more than 15 years hard fighting. At present, the total investment amount reaches 30 million RMB, workshop area more than 35000㎡, with over 200 employees. Gnee is becoming the most professional international steel supply chain company in China central plains with explicit strategic framework, integrated governance structure, firm management foundation, abundant fund and human power.
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 150 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.
Size: DN25-DN2000
Face to Face: API609, BS5155, DIN3202, ISO5752, JIS F7480, API594 and so on
Connection Flange: PN6/PN10/PN16/PN25/JIS5K/10K/16K/150LB/AS2129 Table D/E
316 Stainless Steel Wafer Swing Check Valve
Face to Face: API594 125LB/150LB, DIN3202 K3
Flange: PN10/PN16/, JIS 5K/10K, 125LB/150LB
Seat Type: Common Seat/Bonded Seat
Forged Steel Flanged End Piston Check Valve
Size: 1/2"~2-1/2"; DN15~DN65
Normal pressure: 150LB~2500LB;PN16~PN42
Design standard: API 602, BS5352,AMSE 16.34
Forged Steel Piston Check Valve
Size: 1/4" -2"
Body Material: A105, LF2, F5, F11, F22, F304, F316, F304L,etc. and Monel, Alloy20
Pressure: Class 800,1500
API 602 Forged Steel Check Valves
API 602 forged steel check valve, also known as the check valve, is a kind of automatic valve, it relies on the pressure of the flowing medium in the pipeline to push the valve flap, to achieve the closure and opening of the valve, when the medium stops flowing, the check valve valve flap...
Stainless Steel Piston Check Valve
Sizes: 1/2" - 2" or DN12 - DN50
Pressure Rating: Class 150 - Class 2500 or PN 16 - PN 420
Material of valve body: A105, LF2, F11, F22, F5, F304, F304L, F316, F316L, etc.
Size: 2~32 inch ( DN50~DN800)
Port: Full Port
Working Pressure: 150LB~2500LB option
Working Tem: -40ºC~300ºC
Suitable Medium: Water, Steam, Oil and some corrosive liquid etc.
Size: 1"-10"
Connection Ends: Flange
The primary function of a check valve is to automatically close and prevent reverse flow, safeguarding against damage caused by liquids passing through the pipe in the wrong direction. Lift Check Valves prevent reverse flow or backflow of liquid and ensuring smooth, uninterrupted flow through the system.
The operation of a lift check valve is entirely automated, relying on gravity and media pressure to work.
Lift Check Valves fluid flow must always enter below the seat. As the flow enters and pressure increases, the disk will begin to lift off the seat, allowing flow to pass through the valve. The disc or ball is raised within guides from the seat by the pressure of the upward flow. When the flow stops or reverses, the disc or ball is forced onto valve seat by both the backflow and gravity.
Lift Check Valves are an excellent valve solution for ensuring flow stops in the desired direction and that pressure levels remain consistent. This makes them a valuable addition to any system requiring reliable control of flow and pressure.
Lift check valves have a relatively simple design, making them easy to manufacture and maintain.
These valves respond quickly to changes in flow direction, minimizing the risk of backflow.
Lift check valves typically have lower pressure drops compared to other types of check valves, allowing for efficient flow.
Lift check valves can be used in various applications and industries, including water supply systems, pipelines, and industrial processes.
The simplicity of their design often contributes to the durability and reliability of lift check valves.
Types of Lift Check Valve
Air lift check valve
Air lift check valves are a specific type of lift check valves that are developed for situations where it is crucial to prohibit the passage of air in the opposite direction. They are frequently used in water and wastewater treatment systems to ensure the protection of air supply lines.
Air lift check valves are designed with features that effectively prohibit the entry of air into the system when fluid flow stops. This is especially crucial in situations when air pollution could undermine the effectiveness of the entire system.
Vertical lift check valve
Vertical lift check valves are designed to prevent the reversal of flow in a piping system1. They are activated by the flowing material in the pipeline. The pressure of the fluid passing through the system opens the valve, while any reversal of flow will close the valve. These valves are suitable for installation in horizontal or vertical lines with upward flow. They are recommended for use with steam, air, gas, water, and on vapor lines with high flow velocities
Horizontal lift check valve
Horizontal lift check valves are used primarily for air, gas, and steam services. They utilize gravity to shut off the valve, preventing reverse fluid flow. They have an S-shaped body design with a seat parallel to the fluid flow and must be installed in a horizontal position to allow fluid flow from below the valve seat.
Application of Lift Check Valve
Plumbing systems
Lift check valves are often used in plumbing systems to prevent the backflow of water. They are commonly installed in drainage systems, sump pumps, and sewage systems to ensure the proper flow of wastewater.
Oil and gas industry
Lift check valves are crucial in the oil and gas industry to maintain the flow direction of oil, gas, and other fluids. They are used in pipelines and process systems to prevent any reverse flow, which could lead to equipment damage or safety hazards.
Power generation
Lift check valves are used in power plants to regulate the flow of steam, water, and other fluids in steam turbines, heat exchangers, and condensers. They help maintain the efficiency and safety of the power generation process by preventing any unwanted backflow.
Petrochemical industry
Lift check valves find extensive use in the petrochemical industry to control the flow of various chemicals, gases, and liquids in pipelines and storage tanks. They help protect the equipment from potential damage caused by reverse flow or pressure surges.
Water treatment plants
Lift check valves are essential components in water treatment plants to ensure the unidirectional flow of water. They prevent the contamination of clean water by wastewater or other undesirable substances.
HVAC systems
Lift check valves are commonly employed in heating, ventilation, and air conditioning (HVAC) systems to control the flow of refrigerants, water, and air. They maintain the proper functioning of the system and prevent any reverse flow that could affect its efficiency.
Components of Lift Check Valve
Valve body
This is the component of a lift-type check valve that is used to house all internal parts. Lift check valve manufacturers design the body using strong metallic materials such as carbon steel, stainless steel, ductile iron, and cast iron among other strong materials. The strong materials are aimed at ensuring that the valve remains strong against high pressure and high temperature as well as resistant to impact damage.
Bonnet
This is the component of the lift type check valve which is placed on top of the valve body. The bonnet is connected to the body using bolts and nuts. Bonnets are connected with the body to enhance valve strength. Both the bonnet and body are made of the same metallic material. In case the valve has a technical problem, the lift check valve is opened by opening the bonnet bolts and nuts.
Disc/ball
This is the component of a lift type check valve that is used to close and open fluid flow. Some lift check valves use a disc while others use a ball to close/open fluid flow. The disc/ball opens when there is high inlet pressure and closes when there is low inlet pressure.
Seat
This is the component of a lift check valve where the disc/ball rests when closing fluid flow. The seat is also tasked with preventing fluid leakage between the body and the disc.
Spring
Some lift check valve manufacturers design the valve with a spring to help in closing fluid flow to prevent reverse fluid flow.
Process of Lift Check Valve
A check valve whose disc slides along the vertical centerline of the valve body. The lifting check valve can only be installed on a horizontal pipeline. The disc can be used on a high-pressure small-diameter check valve. . The valve body shape of the lift check valve is the same as the stop valve (can be used in common with the stop valve), so its fluid resistance coefficient is relatively large. Its structure is similar to the stop valve, and the valve body and disc are the same as the stop valve. The upper part of the valve disc and the lower part of the valve cover are processed with guide sleeves. The disc guide can be lifted and lowered freely in the valve guide sleeve. When the medium flows downstream, the disc opens by the thrust of the medium. When the medium stops flowing, the disc depends on its own it falls on the valve seat to prevent the medium from flowing backward. The direction of the medium inlet and outlet channel of the straight-through lift check valve is perpendicular to the direction of the valve seat channel; the vertical lift check valve has the same direction of the medium inlet and outlet channels as the valve seat channel, and its flow resistance is smaller than that of the straight-through type.
How to Maintain Lift Check Valve
Regular inspections
Perform regular inspections to check for signs of wear, corrosion, or damage. Pay particular attention to the piston and seat, as these components are critical to the valve's performance.
Cleaning
Periodically clean the valve to remove any debris or buildup that could affect its operation. Follow the manufacturer's recommendations for cleaning procedures.
Lubrication
Some piston lift type check valves may require lubrication of moving parts to ensure smooth operation. Use appropriate lubricants as specified by the manufacturer.
Flow to lift type check valves must always enter below the seat. As the flow enters, the piston or ball is raised within guides from the seat by the pressure of the upward flow. When the flow stops or reverses, the piston or ball is forced onto the seat of the valve by both the backflow and gravity. Gravity is a large factor in operating a lift check valve due to which the valve must be in a horizontal position when in use.
However, lift type check valves are all position check valves, as the assembly can be done on horizontal, vertical ascending or descending position. In horizontally installed type, the ball is suspended by a system of guide ribs. This type of check valve design is generally employed in plastic check valves.
In this type of check valves, the seats of metallic body lift check valves are either integral with the body or contain renewable seat rings. Disk construction is similar to the disk construction of globe valves with either metal or composition disks.Metal disk and seat valves can be reground using the same techniques as is used for globe valves.
Our Factory
Group has 5 subsidiary corporations, located in Anyang, Tianjin, Hongkong and Singapore countries and districts. Headquarters is in hometown of oracle in Henan province, location of world cultural heritage "Yin Ruin", Anyang city, one of eight ancient capitals of China.
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