Product Description

Product Description

Our company can design and produce marine machinery hydraulic cylinders, vehicle engineering hydraulic cylinders, engineering machinery hydraulic cylinders, and metallurgical machinery hydraulic cylinders by ourselves. It has the characteristics of simple structure, reliable operation, convenient disassembly and assembly, easy maintenance, buffer device and various connection methods.
The inner diameter of the cylinder barrel adopts rolling or honing and polishing processing technology to ensure very high dimensional accuracy, geometric accuracy and surface roughness; the cylinder barrel and tailstock ring welding seam is completed using a special cylinder ring seam automatic welding machine, which is 100% ultrasonic Flaw detection, in line with the standard Class I requirements; the exposed surface of the piston rod when it is extended is all chromium-plated, and will not rust even if it works in sea fog for a long time; various performance tests are carried out on the hydraulic cylinder test bench before leaving the factory; hydraulic pressure Cylinder seals can be of internationally renowned brands, such as British Hallite, or domestic CHINAMFG brands, such as ZheJiang ‘s DZ, etc. We can provide CCS classification society approval certificates.
Customized service

We can offer OEM ODM service,please offer us below data:
Bore size;Stroke length;Rod Diameter;Mounting Type; Mounting length;Paint color requirement.


Production Process
More Product 

Application scenarios

Our company
HangZhou zhonghai marine Machinery Co., Ltd., formerly HangZhou Northern Shipping Engineering Co., Ltd., was established in 1997 and has experienced 26 years of development.

About Us
HangZhou Zhonghai Marine Machinery Co., Ltd. was established in 2008 with a registered capital of 5 million yuan. formerly HangZhou Northern Shipping Engineering Co., Ltd., was established in 1997 and has experienced 26 years of development.The company is a private enterprise and is located in Liuting New Building Materials Industrial Park, CHangZhou District, HangZhou City, ZheJiang Province. The company’s production plant covers an area of 5,000 square meters. Its leading products include: marine Hydraulic systems of life-saving/rescue equipment, special equipment for shipyards; hydraulic cylinders, hydraulic winches, hydraulic pump stations, hydraulic control valve groups, high-pressure hoses, pipe joints, etc. At the same time, the company also undertakes projects such as hydraulic equipment maintenance, hydraulic cylinder maintenance, and non-standard design of hydraulic equipment. There are currently 45 employees. It has an automatic cylinder welding machine, a special cylinder test bench, a high-pressure hose cutting, stripping, crimping, flushing and bursting pressure test bench, CNC plasma, flame cutting machine, 20t gantry crane, vertical machining center, CNC lathe and general lathe, grinding machine , planing, milling, boring and other equipment.
The company now has a design and R&D space of 200 square meters, more than 10 sets of major scientific research equipment, 15 people with a college degree or above, and 13 technical staff. R&D tasks are formulated every year based on market and enterprise development.
The hydraulic cylinders and hydraulic winches produced by the company have obtained product certifications from CCS (China Classification Society), BV (Bureau Veritas), and DNV (Det Norske Veritas) respectively. The hydraulic systems, hydraulic cylinders, hydraulic winches and high-pressure hoses it produces are exported to the United States, Japan, South Korea, Singapore and other countries.

Honor certificate

Capacity of R&D Research
The company now has a design and R&D space of 200 square meters, more than 10 sets of major scientific research equipment, 15 people with a college degree or above, and 13 technical staff. R&D tasks are formulated every year based on market and enterprise development.

Team building 

Quality Control

1.We have a professional and senior design team and all specification is designed by professional engineers.

2.All product is processed by skilled workers and advanced CNC lathe.

3.All cylinders are 100% tested before package .

4.One year warranty and long time track service is offered to solve any problems of after sale.
5.We can provide China Classification Society certificate.


Q1: Do you accept OEM/ODM manufacturing?

A1: Yes! We do accept OEM/ODM manufacturing.
      We will make the exact product according to your specification and drawing.

Q2: Could we get small quantity samples?

A2: Yes! We understand the quality test is important and we are glad to make the sample for you.
      The MOQ is 1 pcs.

Q3: How long is the production time?

A3: Generally the production time is 30 days. 

Contact us

Amy qiu

HangZhou Zhonghai Marine Machinery Co., Ltd.
Address:No. 37 Yuting Road, Liuting Street, CHangZhou District, HangZhou City


Certification: ISO9001
Pressure: High Pressure
Work Temperature: Normal Temperature
Acting Way: Double Acting
Working Method: Straight Trip
Structure: Piston Type


hydraulic cylinder

What advancements in hydraulic cylinder technology have improved sealing and reliability?

Advancements in hydraulic cylinder technology have continuously contributed to improving sealing and reliability in hydraulic systems. These advancements aim to address common challenges such as leakage, wear, and failure of seals, ensuring optimal performance and longevity. Here are several key advancements that have significantly improved sealing and reliability in hydraulic cylinders:

1. High-Performance Sealing Materials:

– The development of advanced sealing materials has greatly improved the sealing capabilities of hydraulic cylinders. Traditional sealing materials like rubber have been replaced or enhanced with high-performance materials such as polyurethane, PTFE (polytetrafluoroethylene), and various composite materials. These materials offer superior resistance to wear, temperature, and chemical degradation, resulting in improved sealing performance and extended seal life.

2. Enhanced Seal Designs:

– Advancements in seal designs have focused on improving sealing efficiency and reliability. Innovative seal profiles, such as lip seals, wipers, and scrapers, have been developed to optimize fluid retention and prevent contamination. These designs provide better sealing performance, minimizing the risk of fluid leakage and maintaining system integrity. Additionally, improved seal geometries and manufacturing techniques ensure tighter tolerances, reducing the potential for seal failure due to misalignment or extrusion.

3. Integrated Seal and Bearing Systems:

– Hydraulic cylinders now incorporate integrated seal and bearing systems, where the sealing elements also serve as bearing surfaces. This design approach reduces the number of components and potential failure points, improving overall reliability. By integrating seals and bearings, the risk of seal damage or displacement due to excessive loads or misalignment is minimized, resulting in enhanced sealing performance and increased reliability.

4. Advanced Coatings and Surface Treatments:

– The application of advanced coatings and surface treatments to hydraulic cylinder components has significantly improved sealing and reliability. Coatings such as chrome plating or ceramic coatings enhance surface hardness, wear resistance, and corrosion resistance. These surface treatments provide a smoother and more durable surface for seals to operate against, reducing friction and improving sealing performance. Moreover, specialized coatings can also provide self-lubricating properties, reducing the need for additional lubrication and enhancing reliability.

5. Sealing System Monitoring and Diagnostic Technologies:

– The integration of monitoring and diagnostic technologies in hydraulic systems has revolutionized seal performance and reliability. Sensors and monitoring systems can detect and alert operators to potential seal failures or leaks before they escalate. Real-time monitoring of pressure, temperature, and seal performance parameters allows for proactive maintenance and early intervention, preventing costly downtime and ensuring optimal sealing and reliability.

6. Computational Modeling and Simulation:

– Computational modeling and simulation techniques have played a significant role in advancing hydraulic cylinder sealing and reliability. These tools enable engineers to analyze and optimize seal designs, fluid flow dynamics, and contact stresses. By simulating various operating conditions, potential issues such as seal extrusion, wear, or leakage can be identified and mitigated early in the design phase, resulting in improved sealing performance and enhanced reliability.

7. Systematic Maintenance Practices:

– Advances in hydraulic cylinder technology have also emphasized the importance of systematic maintenance practices to ensure sealing and overall system reliability. Regular inspection, lubrication, and replacement of seals, as well as routine system flushing and filtration, help prevent premature seal failure and optimize sealing performance. Implementing preventive maintenance schedules and adhering to recommended service intervals contribute to extended seal life and enhanced reliability.

In summary, advancements in hydraulic cylinder technology have led to significant improvements in sealing and reliability. High-performance sealing materials, enhanced seal designs, integrated seal and bearing systems, advanced coatings and surface treatments, sealing system monitoring and diagnostics, computational modeling and simulation, and systematic maintenance practices have all played key roles in achieving optimal sealing performance and increased reliability. These advancements have resulted in more efficient and dependable hydraulic systems, minimizing leakage, wear, and failure of seals, and ultimately improving the overall performance and longevity of hydraulic cylinders in diverse applications.

hydraulic cylinder

Adaptation of Hydraulic Cylinders for Medical Equipment and Aerospace Applications

Hydraulic cylinders have the potential to be adapted for use in medical equipment and aerospace applications, offering unique advantages in these industries. Let’s explore how hydraulic cylinders can be adapted for these specialized fields:

  1. Medical Equipment: Hydraulic cylinders can be adapted for various medical equipment applications, including hospital beds, patient lifts, surgical tables, and rehabilitation devices. Here’s how hydraulic cylinders are beneficial in medical equipment:
    • Positioning and Adjustability: Hydraulic cylinders provide precise and smooth movement, allowing for accurate positioning and adjustments of medical equipment. This is crucial for ensuring patient comfort, proper alignment, and ease of use.
    • Load Handling: Hydraulic cylinders offer high force capabilities, enabling the safe handling of heavy loads in medical equipment. They can support the weight of patients, facilitate smooth transitions, and provide stability during procedures.
    • Controlled Motion: Hydraulic cylinders provide controlled and stable motion, which is essential for delicate medical procedures. The ability to adjust speed, position, and force allows for precise and controlled movements, minimizing patient discomfort and ensuring accurate treatment.
    • Durability and Reliability: Hydraulic cylinders are designed to withstand rigorous use and demanding environments, making them suitable for medical equipment applications. Their durability and reliability contribute to the long-term performance and safety of medical devices.
  2. Aerospace Applications: Hydraulic cylinders can also be adapted for aerospace applications, where lightweight yet robust systems are essential. Here’s how hydraulic cylinders are advantageous in aerospace:
    • Flight Control Systems: Hydraulic cylinders play a critical role in aircraft flight control systems, including ailerons, elevators, rudders, and landing gear. They provide precise and reliable actuation, allowing pilots to control the aircraft’s movements with accuracy and responsiveness.
    • Weight Optimization: Hydraulic cylinders can be designed using lightweight materials, such as aluminum alloys or composite materials, to reduce overall weight. This weight optimization is crucial in aerospace applications to enhance fuel efficiency, payload capacity, and aircraft performance.
    • Shock and Vibration Resistance: Aerospace environments involve significant shock and vibration forces. Hydraulic cylinders can be engineered to withstand these dynamic loads while maintaining performance and reliability, ensuring consistent operation even under extreme conditions.
    • Space Constraints: Hydraulic cylinders can be designed to fit within the space constraints of aircraft or spacecraft. Their compact size and flexible mounting options allow for efficient integration into the limited available space.

In summary, hydraulic cylinders can be adapted for use in medical equipment and aerospace applications, leveraging their precise positioning, load handling capabilities, controlled motion, durability, and reliability. In medical equipment, hydraulic cylinders enable comfortable patient positioning, smooth transitions, and controlled movements during procedures. In aerospace, hydraulic cylinders provide precise actuation, weight optimization, shock and vibration resistance, and space-efficient solutions. By adapting hydraulic cylinders to these specialized fields, manufacturers can meet the unique requirements and enhance the performance of medical equipment and aerospace systems.

hydraulic cylinder

How do manufacturers ensure the quality and compatibility of hydraulic cylinders?

Manufacturers employ various measures to ensure the quality and compatibility of hydraulic cylinders, ensuring that they meet industry standards, performance requirements, and the specific needs of their customers. Here’s a detailed explanation of the methods and practices used by manufacturers to ensure the quality and compatibility of hydraulic cylinders:

1. Design and Engineering:

– Manufacturers employ skilled engineers and designers who have expertise in hydraulic systems and cylinder design. They use advanced design software and tools to create hydraulic cylinders that meet the desired specifications and performance requirements. Through careful analysis and simulation, manufacturers can ensure that the cylinders are designed to function optimally and provide the necessary force, stroke length, and reliability.

2. Material Selection:

– High-quality materials are crucial for the durability, performance, and compatibility of hydraulic cylinders. Manufacturers carefully select materials such as steel or other alloys based on their strength, corrosion resistance, and suitability for hydraulic applications. They source materials from reputable suppliers and perform quality checks to ensure that the materials meet the required standards and specifications.

3. Quality Control:

– Manufacturers implement robust quality control processes throughout the production of hydraulic cylinders. This includes rigorous inspections and tests at various stages of manufacturing, from raw material inspection to final assembly. Quality control personnel perform dimensional checks, surface finish inspections, and functional tests to verify that the cylinders meet the specified tolerances, performance criteria, and compatibility requirements.

4. Testing and Validation:

– Hydraulic cylinders undergo testing and validation procedures to ensure their performance, reliability, and compatibility. Manufacturers conduct various tests, such as pressure testing, leakage testing, load testing, and endurance testing. These tests simulate real-world operating conditions and verify that the cylinders can withstand the expected loads, pressures, and environmental factors. Additionally, manufacturers may perform compatibility testing to ensure that the cylinders can integrate seamlessly with other hydraulic system components.

5. Compliance with Standards:

– Manufacturers adhere to industry standards and regulations to ensure the quality and compatibility of hydraulic cylinders. They follow standards such as ISO 9001 for quality management systems and ISO 6020/2 or ISO 6022 for hydraulic cylinders. Compliance with these standards ensures that the manufacturing processes, quality control measures, and product performance meet internationally recognized benchmarks.

6. Certification and Accreditation:

– Manufacturers may obtain certifications and accreditations from recognized organizations to demonstrate their commitment to quality and compatibility. Certifications such as ISO certifications or third-party certifications provide assurance to customers that the hydraulic cylinders have undergone rigorous evaluations and meet specific quality and compatibility standards.

7. Customer Collaboration:

– Manufacturers actively engage with customers to understand their specific requirements and ensure compatibility. They work closely with customers to gather application-specific details, such as operating conditions, load requirements, and environmental factors. This collaborative approach allows manufacturers to customize hydraulic cylinders and provide solutions that are perfectly matched to the customer’s needs, ensuring compatibility and optimal performance.

8. Continuous Improvement:

– Manufacturers are committed to continuous improvement in their processes and products. They invest in research and development to incorporate the latest technologies, materials, and manufacturing techniques. By staying updated with industry advancements, manufacturers can enhance the quality, performance, and compatibility of their hydraulic cylinders over time.

By implementing effective design and engineering practices, selecting high-quality materials, conducting rigorous quality control, testing and validation procedures, complying with industry standards, obtaining certifications, collaborating with customers, and embracing continuous improvement, manufacturers ensure the quality and compatibility of hydraulic cylinders. These measures help to deliver reliable, high-performance cylinders that meet the diverse needs of industries and applications.
China supplier Source Factory Hydraulic Cylinder   vacuum pump	China supplier Source Factory Hydraulic Cylinder   vacuum pump
editor by CX 2023-12-13