Long Stroke Hydraulic Cylinders

-- Steady & Reliable Manufacturer --

Long stroke hydraulic cylinders are highly specialized linear actuators designed to provide continuous force over extended working distances, making them critical for machinery like large-scale deep telescopic truck cranes, high-capacity dockside container reach stackers, underground mining continuous miners, large civil engineering canal lock gates, and high-rise heavy material scissor lift systems. At Jiangsu Hengcai Hydraulic Mechanical Co., Ltd., we manufacture precision long stroke cylinders engineered to deliver high linear travel, smooth stroke movement, and long-term reliability under continuous pressure. The core engineering challenge with long stroke cylinders involves managing structural deflection, preventing piston rod buckling under compression, and maintaining precise internal alignment over several meters of linear travel. When a cylinder rod extends fully, gravity and external loads apply significant bending forces that can easily bend a standard rod or damage internal guide bushings. To address these structural issues, we utilize thick-walled, high-yield seamless carbon-alloy steel tubing and oversized alloy steel piston rods with high section modulus values. The extended barrels undergo precise horizontal micro-honing to achieve an internal surface finish with exceptional roundness, ensuring uniform pressure distribution. Our long stroke actuators incorporate advanced multi-stage dynamic sealing matrices, featuring low-friction PTFE-faced dynamic rings and oversized composite wear bands that absorb high lateral side-loading forces. Additionally, we integrate advanced adjustable progressive cushioning systems into both end caps, which smoothly decelerate the moving masses at the end of travel, protecting machine mount joints from structural impact damage. By combining tight geometric tolerances, advanced structural materials, and integrated safety valves, our precision long stroke hydraulic cylinders deliver the reliable force, smooth operation, and extended service life needed for your long-reach applications.

Key Features

Engineering Excellence at a Glance

Feature	Technical Advantage
Oversized Alloy Piston Rods	Provides a high section modulus to resist severe compressive buckling forces when the cylinder is fully extended.
Extra-Wide Internal Wear Bands	Absorbs high lateral side-loading forces and prevents metal-to-metal contact over long travel lengths.
Thick-Walled Seamless Tubing	Eliminates barrel deflection and structural bending under heavy material loads, ensuring smooth linear travel.
Progressive Hydraulic Cushions	Decelerates moving components smoothly at the end of travel, preventing high mechanical shocks.
Low-Friction PTFE Dynamic Seals	Eliminates stick-slip behaviors, ensuring smooth positioning control across the entire extended stroke length.
Integrated Sensor Configurations	Supports long-range linear position transducers for high-precision real-time stroke tracking and control.
Reinforced Welded Flange Mounts	Heavy-duty front flange layouts provide a rigid mounting surface to minimize structural flexing under load.

Specifications Guide

Hydraulic Cylinder Specifications Guide

Linear Stroke Manufacturing Scope: Custom manufactured in long-reach configurations with total linear stroke lengths from 3 meters up to 12 meters.
Continuous Circuit Working Pressure: Engineered for continuous operations at high nominal pressures of 16MPa, 25MPa, and up to 35MPa safety thresholds.
Bore Size Manufacturing Range: Available in heavy industrial configurations with inside diameters from 100mm up to large-scale 500mm bore setups.
Piston Rod Metallurgy Specifications: Constructed using certified high-fatigue alloy steels like 42CrMo4 or 20MnV6, induction hardened.
Internal Honing Geometric Tolerances: Inside diameter machined to strict ISO H7 roundness metrics with a surface roughness finish below Ra 0.2 microns.
Linear Position Feedback Accuracy: Supports long-range internal magnetostrictive or cable-extension sensors providing digital tracking accuracy.
Mounting Joint Hardware Options: Outfitted with high-capacity, greasable steel-on-steel spherical bushings to accommodate multi-axis flexing.

Selection Guide

How to Select a Hydraulic Cylinder

Calculate Compressive Rod Buckling Risks: Apply Euler’s buckling formulas based on the total extended stroke length to size the rod diameter safely under load.
Verify Maximum External Side Loading Forces: Size the length of internal guide bushings and wear bands to absorb bending moments when fully extended.
Select the Ideal Mounting Configuration: Choose from rear clevis blocks, solid trunnions, or heavy front flanges to minimize structural flexing.
Analyze Operating Linear Travel Speeds: Specify low-friction PTFE-faced dynamic seals if the cylinder requires rapid stroke cycles or smooth micro-positioning control.
Determine Electronic Position Tracking Needs: Specify integrated long-range linear sensors if the machinery requires automated feedback or dual-cylinder synchronization.
Verify Available Machine Space Envelopes: Double-check total retracted lengths to ensure the cylinder assembly fits inside the equipment chassis when closed.
Confirm Port Sizing for Proper Oil Flow: Specify enlarged fluid port diameters to accommodate high oil volumes and prevent pressure drops during fast stroke cycles.

Why Choose Us

Why Choose HydraForce

Long-Bed Deep-Hole Boring Assets: Our factory workshop features heavy-duty horizontal boring, micro-honing, and CNC lathes for long components.
Advanced Automated Welding Rigs: Our facility utilizes specialized longitudinal and circumferential welding systems that ensure absolute weld depth and structural integrity.
Strict Straightness Quality Verifications: We use high-accuracy laser alignment systems and digital dial indicators to check rod straightness over extended lengths.
100% Full-Stroke Hydrostatic Bench Testing: Every cylinder undergoes full-stroke pressure verification to guarantee zero bypass leak performance across all positions.
Complete Raw Material Certificate Tracking: We provide comprehensive Mill Test Certificates and chemical composition tracking logs with every component order.
Secure Heavy-Duty Export Cratings: Long cylinders are coated with rust preventatives, secured inside reinforced structural wooden or steel shipping crates.

FAQ

Frequently Asked Questions

Q: How do you prevent a 6-meter long piston rod from buckling when pushing a heavy load at full extension?
A: We use high-yield alloy steels like 42CrMo4 to maximize material strength and optimize the rod diameter using safety calculations based on Euler's buckling formulas to handle the target force safely.

Q: Why are extra-wide internal guide bushings critical in long stroke hydraulic cylinders?
A: Fully extended cylinders experience significant bending forces from gravity and shifting loads. Extra-wide bushings and composite wear bands spread these forces across a larger surface area, preventing metal contact and scuffing.

Q: Can long stroke cylinders be equipped with internal electronic sensors for real-time stroke position tracking?
A: Yes, we can integrate specialized long-range magnetostrictive sensors or heavy-duty internal cable-extension transducers that send real-time, precise positional feedback to your automated control system.

Jiangsu Hengcai Hydraulic Mechanical Co., Ltd.

Established in 1988, Jiangsu Hengcai Hydraulic Machinery Manufacturing Co., Ltd. has been dedicated to the research and development as well as the manufacturing of hydraulic cylinders. Situated in Jianhu County, Yancheng City, Jiangsu Province, the factory enjoys a strategic location with Dafeng Port to the east, Xuzhou to the west, Nantong to the south, and Lianyungang to the north. The Xinchang Railway traverses the area, and the 204 National Highway, Coastal Expressway, Yancheng-Xuzhou Expressway, and Ningjingyan Expressway crisscross the region, providing a well-connected transportation network. The proximity to Yancheng Nanyang International Airport, just a 70-kilometer drive away, has laid a solid foundation for the company's rapid growth.

As China Long Stroke Hydraulic Cylinders Suppliers, our hydraulic cylinder products are widely used across various industries, including petroleum, chemical, marine, coal, metallurgy, engineering, construction, machine tools, agricultural machinery, and transportation, serving over 40 large and medium-sized main machine factories. Our products are also exported to the United States, Japan, Russia, and other countries and regions, accompanying the main machines, thus expanding our product's reach globally.

Adhering to the corporate spirit of "Advocate the persistence, endeavour for the winning," and the corporate philosophy of "Technological innovation and technology, people-oriented," we strive to provide reliable products and services in return for the trust of our valued customers.