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Welded Hydraulic Cylinder

Custom Welded Hydraulic Cylinders for Heavy-Duty Industrial Machinery

Zhongye welded hydraulic cylinders are heavy-duty linear actuators built for high-pressure mobile and industrial machinery. Unlike tie-rod designs, welded cylinders feature a compact steel barrel and strong mounting brackets that withstand heavy shock loads and continuous vibration. Each unit uses precision-honed steel tubing, induction-hardened chrome-plated piston rods, and multi-lip seal systems to prevent fluid leaks. Built to custom specifications, every cylinder undergoes pressure and dimensional testing before shipment.

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Hydraulic Product Range

Series	Main Application	Bore Size Range	Rod Diameter Range	Max Working Pressure
ZY-WC Standard Mobile	Agricultural machinery, dump trailers, utility loaders	40 to 125 mm	25 to 80 mm	21 MPa (3000 PSI)
ZY-HD Heavy-Duty Construction	Excavators, loaders, mining equipment	100 to 250 mm	60 to 160 mm	25 to 35 MPa
ZY-TR Trunnion Mounted	Compactor trucks, cranes, tilting mechanisms	80 to 200 mm	45 to 130 mm	25 MPa
ZY-MC Multi-Stage Telescopic	Dump trucks, tipping trailers, lifting platforms	60 to 180 mm (Stages)	Multi-stage telescoping	21 MPa

Selection Parameters

Technical Parameter	Specification Standard
Bore Diameter	40 mm to 300 mm (H8/H9 precision honed tolerance)
Piston Rod Diameter	25 mm to 200 mm
Max Working Pressure	Up to 35 MPa (5000 PSI) based on bore size and wall thickness
Stroke Length	Up to 4000 mm
Rod Surface Treatment	Hard chrome plating thickness 20 to 50 micron; surface roughness Ra under 0.2 micrometer
Corrosion Resistance	Neutral salt spray test (NSS) exceeding 96 to 240 hours (ASTM B117)
Tube Material	ST52 / E355 seamless cold-drawn steel tubing
Seal Kits	Parker, Hallite, or NOK low-friction polyurethane (PU) and PTFE buffer seals
Mounting Styles	Clevis, cross-tube, trunnion, spherical plain bearing, tang, flange mounts

Applications

Agricultural Equipment: Powers loader booms, steering linkages, and implement tilt functions on tractors and harvesters.

Construction and Earthmoving: Drives bucket breakout, boom lift, and arm extension axes on excavators and wheel loaders.

Material Handling and Lifting: Operates scissor lift tables, forklift mast tilt, and tail-lift platforms.

Municipal and Waste Management: Powers compaction mechanisms and multi-stage hoist cylinders on refuse collection trucks.

Quality Control Before Shipment

Welding Inspection: Structural weld seams are inspected using ultrasonic or magnetic particle testing to detect internal pores or cracks.

Proof Pressure Testing: Every cylinder is pressurized to 1.5 times its maximum working pressure to verify structural strength and weld seam integrity.

Internal Leak Testing: Cylinders are tested under pressure in both stroke directions to measure internal fluid bypass past the piston seals.

Dimensional Inspection: Closed and extended lengths, pin hole diameters, thread pitches, and mounting center distances are verified using calibrated coordinate gauges.

Packaging and Port Protection: Ports are sealed with threaded plastic plugs, and rods are coated with anti-rust oil before crating to prevent transit damage.

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Customization Capabilities

Custom Mounting Configurations

Engineered clevis widths, spherical bearing housings, welded trunnion pins, and custom flange patterns to fit existing machine frames.

Integrated Valve Blocks

Direct-mounting counterbalance valves, holding valves, or load-control valves integrated onto cylinder ports to ensure safety under hose failure conditions.

Chief Welded Hydraulic Cylinders suppliers

Extreme Environment Solutions

Integration of nickel-chrome plated rods for marine environments, low-temperature HNBR seals for cold climates down to -40 degrees Celsius, and scraper rings for heavy dust protection.

Stroke Sensing Integration

Integration of internal magnetostrictive linear position sensors or external proximity switches for precise closed-loop motion control.

FAQ

Q: What are the main structural advantages of welded cylinders over tie-rod cylinders?

A: Welded cylinders feature a compact profile with welded end caps and mounting brackets, making them ideal for tight installation spaces. They offer higher structural rigidity and better resistance to high-frequency shock loads and bending moments commonly encountered in heavy mobile machinery.

Q: How do you prevent corrosion and scoring on the piston rods?

A: Piston rods are machined from high-strength alloy steel, induction hardened to increase impact resistance, and ground to a smooth finish (Ra under 0.2 micrometer). They are then hard chrome plated to a thickness of 20 to 50 microns, achieving high resistance to stone chipping, scoring, and salt spray corrosion.

Q: What seal brands and materials do you use for high-pressure operation?

A: We use high-performance sealing systems sourced from established brands like Parker, Hallite, and NOK. Standard configurations use polyurethane (PU) U-cup primary seals and PTFE buffer rings, capable of operating smoothly from -30 degrees Celsius to +100 degrees Celsius under peak pressures up to 35 MPa.

Q: Can you integrate safety valves directly onto the cylinder ports?

A: Yes. We can machine custom port pads to directly mount counterbalance valves, thermal relief valves, or pilot-operated check valves. This eliminates external piping, reduces potential leak points, and prevents load drop if a hydraulic hose ruptures.

Q: What is the standard lead time for custom-engineered welded cylinders?

A: Sample production for custom-designed cylinders typically takes 3 to 4 weeks from drawing approval. Batch production for OEM orders is generally scheduled within 4 to 6 weeks, depending on order volume and specialized raw material availability.

Q: What documentation is supplied with each shipment?

A: Each batch includes material test reports (mill certificates for steel tubes and rods), dimensional inspection sheets, pressure test records, and recommended maintenance instructions covering seal replacement intervals and torque specifications.

We are one of the most experienced welded hydraulic cylinder manufacturers and suppliers in China, specialized in providing high quality customized products. Please feel free to wholesale bulk durable welded hydraulic cylinder in stock here from our factory. Contact us for quotation.

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