We have a 24-hour after-sales service hotline. For quality issues reported by buyers, we will respond immediately.
Our high-quality products are offered at competitive prices.
The vast majority of our shipments are delivered safely and on time.
We Offer One-Stop Solutions for All Your Industrial Valve Needs
Longz was established in 2003. It has production bases for industrial valves in
Changzhou, general valves in Binhai, water conservancy control valves in Tianjin, and casting in Fujian, etc. The total area is 100 mu, with a registered capital of 100.98 million yuan and over 350 employees. After years of hard work and development, it is a valve enterprise integrating scientific research, design, manufacturing, sales, and service.
The Industrial Valves We Produce
I can help you select the apporpriate types of valves based on your specific requirements
The sphere is supported between the valve body and the valve cover and is lined with a sliding bearing with good self-lubricating and wear-reducing properties. The force exerted by the sphere on the seat is precisely controlled. The valve stem is not affected by the thrust of the ball, and the valve operation is light and flexible.
Reliable sealing performance, even after many switching actions under the maximum pressure difference (full pressure difference), it can still ensure that the sealing is leak-proof, ensuring that it can be safely used in the transmission pipeline of special media such as petroleum, natural gas, and gas.
The spherical valve adopts a spherical design with a more evenly distributed stress surface, effectively avoiding bending deformation caused by stress concentration in the valve pipeline. The spherical body is more stable than the cylindrical body against tensile stress and bending force in the pipeline.
Reliable sealing performance, even after many switching actions under the maximum pressure difference (full pressure difference), it can still ensure that the sealing is leak-proof, ensuring that it can be safely used in the transmission pipeline of special media such as petroleum, natural gas and gas.
DN350-DN1400 high-temperature ball valve adopts fixed ball piston-type valve seat sealing, with better resistance to pipeline stress. The central shaft adopts a blow-out structure, and the central shaft sealing system can be replaced. The bidirectional double-sealing mechanism ensures that the valve can produce excellent sealing performance in both high and low positions.
The valve body is aesthetically pleasing and pre-drilled with pressure measurement holes. It is convenient and quick to use. According to user requirements, the screw plug on the valve cover can be replaced with a ball valve, and the ball valve outlet can be connected to a drainage pipe, so that the valve cover can be removed without reducing pressure.
Product Main Feature
Corrosion-resistant industrial valves are special industrial valves designed to resist the corrosion of strong corrosive media such as acids, alkalis, and salts.
Anti-static industrial valves are a type of industrial valve specially designed with an electrostatic discharge device.
Stable and high-quality industrial valves with precise sealing structure and rigorous working condition durability design ensure no leakage during long-term operation,
Explosion-proof industrial valves adopt an explosion-proof shell and intrinsic safety design
Why Choose Us?
Focusing on pipeline integration control, redefining valve standards with technology, and core competitiveness
With our most rigorous working style and the most advanced product design, we ensure precision in every valve we manufacture. Quality brings benefits, and we provide first-class products that meet exact specifications for your pipeline needs.
For many years, Liangzheng has been committed to “focusing on pipeline integration control.” Technology pursues innovation to ensure stable performance. Our safe and reliable designs maximize the efficiency of your industrial systems.
We always maintain positive communication with our customers to understand their various requirements. providing reasonable prices and professional services, and maximize the value of good products in your market.
Liangzheng has a strong professional after-sales team and a 24-hour service hotline. For any issues, we respond immediately and rush to the sport, supplying substantive solutions in the shortest time to ensure easy maintenance.
Applications of Industrial Valves in Energy Sector
Industrial valves play a crucial role in the energy sector, serving as key control points in oil and gas, power generation, renewable resource systems, and chemical industries. In upstream oil and gas exploration, high-performance valves such as gate valves, stop valves, and check valves are deployed in the wellhead and pipeline network to withstand corrosive and extremely high-pressure environments. In power plants, valves manage steam flow, cooling water circulation, and fuel supply. In harsh operating conditions, control valves are used to control the high-pressure steam entering the turbine to ensure efficiency and safety.
Safety Standards and Compliance for Industrial Valves
Safety and compliance are non-negotiable aspects of industrial valve engineering, governed by complex national and regional standards frameworks. Key design and manufacturing standards include certifications such as API6D and ASME B16.34. These standards specify requirements such as pressure-temperature ratings and materials choice to ensure that valves can safely contain process fluids under specified operating conditions.
Application Scenarios of Industrial Valve
Industrial valves are suitable for petroleum, natural gas, electric power, water supply and other industries.
As a key control element in the petrochemical industry, industrial valves are widely used in high-temperature and high-pressure systems, chemical reaction devices, and storage tank configurations, guaranteeing regulation and leakage protection of media and system safety under harsh conditions.
Industrial valves are the core control device in the natural gas industry, used in gas pipelines, processing plants, and flow distribution and safety to ensure efficient gas transportation and system reliability.
Industrial valves are key control components in the power industry and are used for boiler steam regulation, cooling system management, etc., to ensure energy conversion safety and stable system operation.
Industrial valves are key components in the water treatment industry, used for water distribution, sewage treatment, water quality adjustment, and pressure management of pipelines. They ensure the safety of system operation and the efficiency of water treatment through flow regulation and opening and closing functions.
FAQ
To choose the right valve, please consider the type of fluid, operating temperature, pressure requirements, flow rate, and the industry you are in.
Of course, our valves comply with major international standards such as API, ISO EAC.
Do you have a minimum order quantity requirement for your industrial valves?
Of course, the sample fee can also be deducted from your first order.
Quality is our top priority, and every valve undergoes rigorous pressure testing.
For further details or a tailored quote, please contact our sales department directly.
Client Testimonials
The ball valves and butterfly valves purchased from your company have arrived and passed inspection. The quality is excellent! The material and sealing performance fully meet our requirements. They run smoothly after installation.
Knowledge Base
Industrial Valve Selection and Certifications
Company introduction video
Certificates held by the company
Pictures of the company’s products
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A Message from the Founder
“A workman who wants to do his job well must first sharpen his tools.”
Liangzheng people are well aware of this. Good management, good concepts, good talents, and advanced equipment are all needed to enable an enterprise to truly have strong production capacity and ensure the excellent quality of its products.