Hydraulic Jacking Cylinders

Product Specifications

Technical details and manufacturing context for Hydraulic Jacking Cylinders

Definition

Hydraulic jacking cylinders are precision-engineered components within the Main Jacking System that convert hydraulic pressure into linear mechanical force to lift, lower, or position heavy machinery, structures, or equipment. They serve as the primary force-generating elements in jacking operations. These cylinders are typically constructed with high-strength alloy steel bodies, chromium-plated piston rods for corrosion and wear resistance, and polyurethane seals to ensure reliable operation under high pressure. The rated lifting capacity ranges from 50 to 500 tonnes, with operating pressures between 20 and 70 MPa. Stroke lengths vary from 100 to 2000 mm, and cylinder bore diameters range from 50 to 400 mm, while piston rod diameters are between 28 and 200 mm. The maximum operating temperature is -20°C to 80°C, and the ingress protection rating is IP54 to IP65 per IEC 60529. The cylinder tube material is specified as 27SiMn per GB/T 17396, and the piston rod surface treatment includes hard chrome plating of 20 to 30 μm thickness. Maximum lateral load is 2 to 5% of capacity, and cylinder weight ranges from 50 to 2000 kg. Retraction speed is 50 to 150 mm/s. These parameters are directory reference ranges and must be confirmed for the actual model and application. Selection should be based on maximum load and safety factor, required lifting height, and environmental conditions. Verification of model-specific values and standards with the legal manufacturer or supplier is essential before procurement or use.

Working Principle

Hydraulic fluid under pressure is directed into the cylinder chamber, acting on the piston surface area to generate linear force. The force output is determined by the pressure and piston area (Force = Pressure × Area). Retraction typically occurs through mechanical springs, gravity, or reverse hydraulic pressure. The working principle relies on Pascal's law, where pressure applied to a confined fluid is transmitted equally in all directions. The cylinder's bore diameter and operating pressure directly influence the force capacity, while the stroke length determines the lifting range. Proper sealing and material selection are critical to withstand high pressures and prevent leakage. The system must be operated within specified pressure and temperature limits to avoid seal damage and rod bending. Regular inspection of seals, rod surface, and hydraulic fluid condition is necessary to maintain performance and safety.

Common Materials

High-strength alloy steel, Chromium-plated piston rods, Polyurethane seals

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Lifting Capacity	50–500 t	Select based on maximum load and safety factor.
Operating Pressure	20–70 MPa	Higher pressure reduces cylinder size but requires stronger seals.
Stroke Length	100–2000 mm	Determine by required lifting height.
Cylinder Bore Diameter	50–400 mm	Affects force and speed; match to capacity and pressure.
Piston Rod Diameter	28–200 mm	Must withstand buckling load.
Maximum Operating Temperature	-20–80 °C	Seal material limits; above 80°C use special seals.
Ingress Protection Rating	IP54–IP65	Higher rating for dusty or wet environments.IEC 60529
Cylinder Tube Material	27SiMn	High-strength steel for pressure resistance.GB/T 17396
Piston Rod Surface Treatment	20–30 μm	Hard chrome plating thickness for corrosion and wear resistance.
Maximum Lateral Load	2–5 % of capacity	Exceeding this may cause rod bending and seal damage.
Cylinder Weight	50–2000 kg	Important for handling and installation.
Retraction Speed	50–150 mm/s	Affects cycle time; limited by pump flow.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Cylinder Barrel
Contains hydraulic fluid and guides piston movement

Material: High-strength alloy steel
Piston
Converts hydraulic pressure into linear force

Material: Hardened steel with wear-resistant coating
Piston Rod Part
Transmits force to external load

Material: Chromium-plated steel
Seal Kit Part
Prevents hydraulic fluid leakage

Material: Polyurethane/Nitrile rubber
Springs Optional
Retract the rod on spring-return cylinders.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Hydraulic Jacking Cylinders.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Main Jacking System

View system integration details

Manufacturers of Hydraulic Jacking Cylinders

Manufacturer profiles associated with Hydraulic Jacking Cylinders.

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Frequently Asked Questions

What factors determine the rated lifting capacity of a hydraulic jacking cylinder?

The rated lifting capacity is determined by the maximum load and safety factor required for the application. It is also influenced by the operating pressure and the piston area. The directory lists a range of 50 to 500 tonnes, but the exact capacity must be confirmed based on the specific model and application.

How does operating pressure affect cylinder size and performance?

Higher operating pressure allows for a smaller cylinder bore to achieve the same force, but it requires stronger seals and materials to withstand the increased stress. The directory range is 20 to 70 MPa. Selection should consider the trade-off between size and seal durability.

What is the significance of the ingress protection rating?

The ingress protection rating (IP54 to IP65) indicates the level of protection against dust and water. Higher ratings are suitable for dusty or wet environments. It is important to match the rating to the operating environment to ensure reliable performance and longevity.

Why is it necessary to verify specifications with the manufacturer?

The values provided in the directory are reference ranges. Actual model-specific parameters, such as exact dimensions, materials, and standards compliance, must be confirmed with the legal manufacturer or supplier to ensure the cylinder meets the requirements of the specific application and safety standards.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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pressure:	Up to 700 bar (10,000 psi)
flow rate:	5-100 L/min (depending on cylinder size)
temperature:	-20°C to 80°C
slurry concentration:	Not applicable - clean hydraulic oil only

Product Specifications

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