Custom Double Acting Hydraulic Cylinders

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Brands We Serve in Hydraulic Industry

Double-Acting Hydraulic Cylinders

Double-acting hydraulic cylinders have both the extension and retraction strokes which are driven by hydraulic pressure. They have both inlet and outlet ports so that can deliver significant force in both pushing and pulling directions.

For custom specs, we offer bore sizes ranging from 40mm to 400mm and strokes up to 6 meters. 16 to 35 Mpa is our operating pressure, with heavy duty option to 42 Mpa. We use premium seamless steel tubes like Grade 45, ST52.3, or E355. The piston rod is made of Grade 45 steel or 40Cr with a 20 to 30-micron hard chrome plating; Top brands like Trelleborg and Parker are our exclusive choices. We use NBR, polyurethane, or high-temperature Viton depending on your specific operating temperatures.

After heating treat steel tubes to relieve stress, we use deep-hole boring and roller burnishing to shape the inner bore. So now we create a smooth finish inside the cylinder and keep the seals safe and prevent internal leaks. For the piston rods, we rough-grind them, heat-treat them for strength, and fine-grind them to a smooth finish before chrome plating. Every cylinder is tested on our rig at 1.5 times its rated pressure, cycled 5 times. We make sure they can run million cycles under various working conditions.

Your Reliable Manufacturer of Double-Acting Hydraulic Cylinder in China

Hydroforce focuses on customized, high-performance double-acting hydraulic cylinders. We help you solve difficult power transmission challenges in tough environments.

In fields like two-way piston seals, piston rod straightness and cylinder wall wear resistance, we hold us to the highest standards. From stress-relief heat treatment and rough boring to final roller burnishing, our talented team closely monitors every step.

We also perform full-stroke reciprocating tests and pressure-holding tests on our double action cylinders to ensure zero leakage performance under challenging conditions.

We help you avoid supply chain risk as a custom manufacturer. In hash environments like high heat, dusty, marine corrosion or acid salt spray, we will suggest upgrading material to corrosion-resistant level. We can cut your material costs by up to 10% without mature supply chain. We ensure fast delivery of custom orders within 4-8 weeks.

Double Acting Hydraulic Cylinders

Applications of Double-Acting Hydraulic cylinders

Construction and Engineering Machinery

Double-acting hydraulic cylinders are widely used in construction machinery like excavators, cranes, loaders, concrete pump trucks, and shield tunneling machines. They can be applied driving key components which require strong two-way force and strict control such as raising and lowering working arms, telescoping booms, pressing down blades, pushing materials, and steering the vehicle.

Our double-acting cylinders allow for precise hovering and micro-adjustments of mechanical arms with active two-way control. Equipment are able to “bite” hard into the ground due to their ability to offer down force. These cylinders’ high fully hydraulic supported operating speed greatly improves construction efficiency.

Agricultural and Utility Machinery

Double-acting hydraulic cylinders are widely used in agricultural and utility machinery. For example. raising and lowering implement hitches, folding headers and spray booms, rotating reversible plows, compressing waste in garbage trucks, adjusting snow plows, and extending aerial platforms.

These cylinders force plows to till deeply by applying downward pressure. Their two-way push and pull also allows agricultural equipment to fold and unfold flexibly.

There are full of mud,dust,branches and debris in agricultural settings. For single-acting cylinders, this may lead to an easy jam or break. Double-acting cylinders deliver high reliability,quick response, bigger successful possibility under these harsh conditions.

Waste & Sanitation Vehicles

Double-acting hydraulic cylinders serve as the absolute key component of sanitation vehicles, providing ejector panels and container-lifter mechanisms of waste compactors with bidirectional power output.

Physical crushing and powerful squeezing of the equipment when performing task like pushing and compacting waste is supported by the massive active thrust generated by these cylinders. Sanitation operations have to be efficient. Double-acting hydraulic cylinders enjoy high working speed and well controlling power which aligns with that need. More, these cylinders will say goodbye to wastewater leakage and unneeded sagging of the vehicle body.

Marine & Port Lifting

Applied in luffing or tilting of marine cranes and port grabs, these cylinders face high salt spray and high humidity environment. These cylinders act like steel muscles to push and pull with equal strength holding the boom and cargo firmly.

The double-acting hydraulic cylinders form a physical dead-lock by trapping high pressure oil on both sides of the piston with dual-line hydraulic locks. The crane boom will remain securely locked even during an unexpected hose burst in heavy ocean winds. These cylinders respond quickly to command due to double-way oil push by the hydraulic pump. This allows cylinder to work with computerized systems,making real-time micro-adjustments to the boom height as wave goes up and down ensuring cargo landed safe and sound.

Metallurgy & Equipment

Double-acting hydraulic cylinders are used for squeezing operations in steel mill blast furnaces and continuous casting equipment under heavy radiant heat and dust.

These cylinders can work flawlessly in several hundred degrees temperature and dusty conditions due to being safely sealed inside a robust steel body.

The structure of these cylinders offers extreme rigidity and stability, staying completely rock-solid even under hundreds of tons of impact. It ensures a smooth, steady pour of molten steel, with zero wobbling or slipping caused by shifting gravity.It is the undisputed "workhorse" of heavy industry.

Mining and Tunnel Boring

Double-acting hydraulic cylinders are widely used for dump truck hoisting and IBM thrusting under high pressure reaching 350 Bar.

In mining industry, the bit,cutter head or support can easily get stuck by collapsing sediment when boring or drilling. Compared to single-acting cylinder,a double-acting one can produce powerful active retraction force to pull the stuck equipment free.The cylinders are fully sealed against sand ingress, so they are not affected by muddy water or abrasive dust in that environment. These cylinders create precise control for TBM weighing thousands of tons to make millimeter-level steering and correction adjustments underground due to having pressure on both sides of the piston.

Industrial Production
Lines

Double-acting hydraulic cylinders are used for rapid lifting and precise positioning in various conditions demanding extremely high cycle life.

These cylinders act like two hands working with each other giving the equipment high control stiffness.Together with sensors, micron-level positioning and instant stop response are achieved with no residual inertial vibration. Whether it's metal stamping requiring hundreds of tons of force or a gentle pick-and-place operation requiring only a few dozen grams, it handles both with ease. It does the heavy work without crushing delicate work pieces.

Special Vehicles and Transport

Double-acting cylinders serve as the important role for power steering and multi-axle forced steering. Even on muddy road or staying still, these cylinders can easily turn oversized tires for steering or crab walking because pulling and pushing are both driven by massive hydraulic power.

The double-acting ‘s both direction acts adjust the the chassis height in real time. When the vehicle hits a pothole of tilts. These cylinders can keep the transport load perfectly level and prevent rollover. They provide absolute safety for vehicle and cargo no matter how rough the rider or even in the extreme event of a hydraulic line burst. The outriggers and suspension will never droop or collapse.

Parallel Throttle and Check Valve Cushion

During rapid direction changes, double-acting cylinders are prone to hydraulic shock and mechanical vibration. Loosen pipe fittings,damage seals are caused by this.It can also produce fatigue fractures in the steel structure over time.

Fixed-orifice and adjustable-orifice are two key cushioning designs for solving this issue. To make sure cushioning components not fail during operation,We strictly control the fitting clearance between the cushion plunger and the bore to 0.03–0.07 mm and ensure high coherence. More,a check valve is integrated in parallel with the cushion circuit,allowing high-pressure oil to bypass the throttle valve on reversal for immediate, highly responsive starts.

$Hydraulic cylinder piston rod thread root crack failure, metal fatigue fracture close-up$

Connection Shift and Wear on Double Action Cylinders

Minor shifts at key connection will be caused by High-frequency vibration and hydraulic shock if the locking process isn’t up to standard. Both the rod and the barrel will be ruined by leaving parts inside cylinder bore when the threads wear down or strip completely.

A combined system of multi-point thread engagement,chemical bonding and mechanical locking is used to make the components totally vibration-proof. First,to make sure uniform contact across the entire thread profile, the threads are all machined in a single setup to strict 6H/6g tolerances.Next, we apply high-strength anaerobic adhesives like Loctite 263 or 272, which cure into a tough solid that resists severe impact, fluid ingress, and thermal stress. Last a set crew with a protective brass pad or a castellated nut with a split pin is used to add a redundant mechanical lock. These are all tailored directly to customers’ operating tonnage and spatial limits.

Jerking on Hydraulic Double Acting Cylinders

Stick-slip behaviour during operation can often occur for double action hydraulic cylinders. The cylinder will jerk forward like accordion and not moving with smooth.This ruins positioning accuracy, accelerates component wear, and triggers severe machine-wide resonance.

We use roller burnishing (SRB) to process our cylinder bores so that inner surface roughness drop to Ra 0.2 microns followed by forming a smooth ,wear resistant cold-worked layer. We also upgrade internal sealing systems to bronze-filled PTFE Glyd Rings and Step Seals, creating an ultra-low friction environment where static and dynamic friction are virtually identical. Finally, heavy duty widened wear bands are installed to absorb side loads and totally prevent metal to metal contact and dry rubbing between the road the barrel wall.