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Heavy Duty Hydraulic Cylinder

A heavy duty hydraulic cylinder is engineered to deliver exceptional strength, reliability, and longevity in the most challenging industrial environments. These cylinders are designed to operate under high pressure and extreme conditions, making them ideal for sectors such as construction, mining, offshore engineering, and heavy machinery.

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Description

The construction of a heavy duty hydraulic cylinder begins with the selection of premium materials. The cylinder barrel is manufactured from high-strength steel tubes, chosen based on internal diameter and operating pressure. For instance, cold-rolled precision seamless tubes are used for IDs up to 300mm, while forged tubes are employed for diameters exceeding 500mm. Common materials include ST52, SAE4140, and SAE1045, ensuring durability and resistance to wear. The interior surface is finely honed to a roughness of Ra 0.2–0.4 and can be chrome-plated for enhanced corrosion resistance and reduced friction.

The piston rod, another critical component, is made from hardened materials such as SAE4140, 42CrMo4, or stainless steel. Each rod undergoes surface hardening to achieve a hardness of HRC 55–60, followed by chrome or nickel plating with thicknesses ranging from 20 to 50 microns. Precision machining ensures tight tolerances (ISO f7/f8/f9), guaranteeing smooth operation and minimal leakage.

Sealing systems are tailored to application requirements using high-quality brands like Parker, Merkel, or NOK. These seals ensure leak-free performance under pressures up to 700 bar (10,150 PSI), extending the service life of the heavy duty hydraulic cylinder and simplifying maintenance.

Welded joints between the tube and flanges are rigorously tested using ultrasonic methods to ensure integrity and prevent leaks throughout the cylinder's lifespan. With strokes ranging from 50mm to 16,000mm, these cylinders offer flexibility for various applications.

As an ISO 9001:2015 certified manufacturer, we provide custom hydraulic solutions backed by professional engineering support and aftersales service. Whether for OEM partnerships or specialized projects, our heavy duty hydraulic cylinders are built to perform reliably under the most demanding conditions.

JIANGSU YINGNAISI company design and manufacture heavy duty hydraulic cylinders that covering the following fields:

hydraulic press cylinder
construction machinery cylinder
mining machinery cylinder
metallurgy machinery cylinder
water power project cylinder
marine hydraulic cylinder
servo hydraulic cylinder

2. Design

Not only we could manufacture all kinds of hydraulic cylinders according to the drawing from our

customers,but also we could make a design according to customer's requirements.If you

require our engineer to make a design,pls advise us the following specification:

1. Rated pressure

2. Working pressure

3. Test pressure

4. Working condition and environment ,for example ,temperature ,working frequency

5. Pulling force ,and return stroke force

6. Pulling and return speed

7. Assembly size

8. Seal ring requirements .For example , brand ,seal material etc .

9. Tube and piston rod raw material requirements

10. Piston rod surface treatment requirements, for example chromating film thickness ,

Surface hardness etc .

11. Painting and other spare parts requirements .

3. Manufacturing capability and cylinder size range

3.1 Cylinder bore diameter :max Ø1200mm

3.2 Cylinder length :10Meter

3.3 Max lifting capability :50 Tons

4.Manufacturing and inspection

4.1.Cylinder tube size and choice

4.1.1 According to the cylinder pressure and inside diameter size ,different steel tube Would be choosed .

1. ID ≤300mm , cold rolled precision seamless tube would be choosed

2. 300mm≤ID ≤500mm , hot rolled seamless tube would be choosed

3. 500mm≤ID ≤1000mm, forged tube would be choosed

4.1.2 Cylinder tube steel grade : SAE1020 , SAE1045 ,27SiMn , S355JR ,S355J2G3

St52-3 ,SUS304 ,SUS316L etc .

4.1.3 Cylinder tube inside boring and honing , roughness R0.2-R0.3,

4.1.4 Cylinder tube inside chromating : if necessary ,tube inside chromating could be applied

4.2 Piston rod is a very important part for hydraulic cylinder .

4.2.1 Piston rod steel grade : SAE1045, 42CrMo4, SUS410 ,SUS420, SUS304, SUS316L

4.3 Seal ring and O ring

According to the customers' requirements and working condition , we would choose suitable

seal ring kit , . we would supply suitable seal solution for their customer so that hydraulic cylinder has more

lifetime , easy maintenance and simple repairing .

4.4 Tube and flange welding

The welding on cylinder tube and flange would be Ultrasonic tested every time , the welding seam would be

cleaned before machining .we ensure that every welding seam has no any leak during lifetime

4.5 Assembly and pressure test

Before hydraulic cylinder is assemblied , every spare parts would be measured and cleaned .After hydraulic

cylinder is assemblied , pressure test would be carried out one By one , eternal company ensure that testing

pressure is higher 30%-50% than working pressure , and pressure holding time 30~60 minutes is necessary . Every piece hydraulic cylinder must be tested completely without any leak .

4.6 Painting and storage .

After hydraulic cylinder pass through pressure test , painting is necessary .

4.hydraulic cylinder quality guarantee system

Program before Delivery

1. Trial Operation Test

2. Start-up Pressure Test

3 Pressure-Tight Test

4. Leak Test

5. Full Stroke Test

6. Buffer Test

7. Testing the Effect of Limit

8. Load Efficiency Test