Lift Type Check Valve

The Lift Type Check Valve is an automatic valve whose core function is to allow unidirectional flow of the medium and prevent backflow. It is widely used in various industrial and municipal pipeline systems and is a key component to ensure system pressure stability and equipment safety. Zhongguan Valve, a manufacturer specializing in valves for 19 years, produces lift check valves that strictly adhere to international standards. Leveraging its supply chain advantages across China, the company selects high-quality materials suitable for various operating conditions, balancing structural rationality and ease of use. Customized specifications are available to meet specific customer needs. 

Our lift check valves utilize a vertically moving valve disc structure, eliminating redundant design and optimizing the flow path layout. Compared to traditional check valves, they offer more precise opening and closing response, more stable sealing performance, and lower flow resistance loss. They are suitable for various media including water, steam, oil, and corrosive fluids, making them one of the most cost-effective check valves on the market.

Product Working Principle 

The Zhongguan Valve Lift Type Check Valve operates based on the synergistic effect of fluid pressure and mechanical structure. It achieves automatic opening and closing control without manual or external force. The specific process is as follows:

1. Forward Flow: When the medium flows forward along the pipeline, the fluid pressure overcomes the weight of the valve disc and the spring force, pushing the valve disc vertically upward, creating a smooth flow path between the valve seat and the valve disc, allowing the medium to pass smoothly;

2. Reverse Cut-off: When the medium flow stops or a reverse flow trend occurs, the fluid pressure disappears. Under the combined action of its own weight and the spring's restoring force, the valve disc descends rapidly and vertically, tightly fitting against the valve seat to achieve a seal and prevent backflow of the medium.

3. Stability Guarantee: The spring-assisted design accelerates the valve disc's closing speed, reduces water hammer, and avoids wear caused by collisions between the valve disc and valve seat, extending product lifespan and ensuring long-term stable operation of the pipeline system.

Core Product Features

We consistently prioritize actual operating conditions, incorporating multiple practical technologies into the design and production of our Lift Type Check Valves. This results in the following core features that distinguish them from ordinary similar products:

• Precise Opening and Closing: The linear axial lifting structure ensures rapid opening and closing response, eliminating jamming and delay, effectively eliminating water hammer, and making it suitable for frequent pump start-stop operations;

• Reliable Sealing: Utilizing a metal-elastomer composite sealing surface design, the sealing performance is stable, with long-term leakage control below 0.01 L/min·m, and a wear rate far lower than traditional check valves;

• Low Flow Resistance: Optimized flow channel design reduces resistance loss during media flow, with pressure loss not exceeding 0.15 bar at rated flow, contributing to system energy conservation and consumption reduction;

• Convenient Maintenance: Modular structural design eliminates the need to disassemble pipe flanges for routine maintenance. Technicians can complete over 90% of maintenance work through the top inspection port, significantly shortening maintenance time and reducing maintenance costs;

• Wide compatibility: Materials and specifications can be customized to adapt to different pressure, temperature and media conditions, covering a variety of nominal diameters from DN15 to DN300, and pressure ratings from 1.6MPa to 4.0MPa, meeting the procurement needs of multiple fields.

Product Technical Advantages

I. Structural Design Advantages

Our Lift Type Check Valve's structural design, combined with 19 years of industry experience and feedback from various operating conditions, has undergone multi-dimensional optimization, resulting in differentiated technical advantages:

Linear Opening and Closing Structure: Utilizing an axial lifting design for the valve disc, compared to traditional swing check valves, it effectively eliminates water hammer. Experimental verification shows that in a DN200 pipeline system, it can reduce water hammer pressure fluctuations by 62%, protecting pipelines and equipment from impact damage;

Modular Assembly: The valve body, valve disc, spring, and other components adopt a modular design, ensuring high assembly precision and convenient disassembly. This not only facilitates production testing but also provides convenience for later maintenance, reducing maintenance difficulty and labor costs;

Lightweight Optimization: While ensuring structural strength, the valve body wall thickness design has been optimized to reduce product weight, facilitating transportation and installation, while also reducing pipeline load pressure, making it suitable for special installation scenarios such as high altitudes and confined spaces.

II. Material Selection Advantages

Zhongguan Valve leverages its integrated supply chain across northern and southern China to select suitable materials based on different operating conditions, ensuring the durability and adaptability of its Lift Type Check Valves. Specific material applications are as follows:

Regular Operating Conditions: QT400-15 ductile iron and 2Cr13 stainless steel are used, offering high cost-effectiveness, corrosion resistance, and wear resistance, suitable for water, steam, and ordinary oil media.

Corrosive Operating Conditions: ZG1Cr18Ni9Ti stainless steel is used, offering strong resistance to chloride ions, nitric acid, and other corrosive media, suitable for seawater desalination, chemical corrosion pipelines, and other scenarios.

High Temperature and High Pressure Operating Conditions: High-temperature resistant alloy materials are used, with a temperature resistance up to 300℃ and a pressure resistance up to 4.0MPa, suitable for high-temperature and high-pressure pipeline systems in power plants, boilers, and other applications.

All materials undergo rigorous physical and chemical testing to ensure compliance with standards, guaranteeing product quality from the source, extending product lifespan, reducing replacement frequency, and lowering long-term procurement costs for customers.

III. Manufacturing Process Advantages

We have two major production bases in Tianjin and Wenzhou, equipped with advanced CNC machining and testing equipment. We employ standardized production processes to ensure the consistent quality of every Lift Type Check Valve:

Precision Machining: Key components such as valve seats and valve discs are precision machined on CNC lathes, ensuring high machining accuracy and a tight seal, reducing the risk of leakage.

Strict Testing: We have established a comprehensive testing system, from raw material inspection upon arrival and random checks during production to finished product hydrostatic testing and airtightness testing. Every step meets standards, and unqualified products are strictly prohibited from leaving the factory.

Standardized Production: We manufacture in accordance with standards such as GB/T 12235-2022 and API 6D, ensuring compatibility with mainstream international specifications. This facilitates customer replacement of existing equipment, reducing procurement and replacement costs.

Product Application Scenarios

Zhongguan Valve Lift Type Check Valve, with their wide adaptability, can be applied to pipeline systems in multiple fields, covering industrial, municipal, and environmental sectors. Specific application scenarios are as follows:

I. Industrial Sector

Petrochemical Industry: Suitable for pipelines transporting crude oil, refined oil, and chemical raw materials, preventing backflow that could damage equipment, waste materials, and ensure production safety;

Power Industry: Used in boiler feedwater, cooling water, and steam pipelines in thermal and hydropower generation systems, preventing reverse flow of media and ensuring stable operation of generator units;

Metallurgical Industry: Suitable for pipelines treating metallurgical wastewater and high-temperature flue gas, resistant to corrosive media and certain temperatures, ensuring smooth progress of metallurgical processes.

II. Municipal and Public Services Sector

Water Treatment: Used in water supply and drainage pipelines and chemical dosing pipelines of waterworks and sewage treatment plants to prevent sewage backflow and clean water contamination, ensuring stable operation of the water treatment system.

Municipal Heating: Adapted to urban centralized heating pipelines to prevent hot water backflow, ensuring stable heating pressure and improving heating efficiency.

Building Water Supply and Drainage: Used in water supply systems and fire protection pipelines of high-rise buildings to prevent backflow of media caused by pipeline pressure fluctuations, ensuring building water and fire safety.

III. Special Operating Conditions

Seawater Desalination: Made of corrosion-resistant stainless steel, suitable for seawater and desalinated water transportation pipelines, resistant to high-salinity media corrosion, ensuring stable desalination process.

Low-Temperature Operating Conditions: Customized low-temperature adaptable products, suitable for low-temperature environments of -40℃ to 0℃, used in cold chain and low-temperature fluid transportation pipelines, ensuring normal backflow prevention function.

Frequent Start-Stop Operating Conditions: Adapted for pipeline systems with frequent pump start-stop, such as circulating water systems and emergency water supply systems, with rapid opening and closing response, reducing water hammer impact.