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Double Acting Hydraulic Cylinders

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What is a Double Acting Hydraulic Cylinders?

A double acting hydraulic cylinder is a type of hydraulic cylinder that can produce force in both directions. It is designed with two ports, one for extending the piston rod and the other for retracting it. This means that hydraulic fluid is alternately pumped into one port to extend the piston, then moved to the other port to retract it. Double acting cylinders are commonly used in applications such as construction machinery, manufacturing equipment, and industrial automation. They offer improved control over motion, because they can be used to push, pull, lift or lower loads.

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Benefits of Double Acting Hydraulic Cylinders

Increased efficiency

Double acting hydraulic cylinders can be used for both extension and retraction, which increases their efficiency. This means that less energy is required to operate the cylinder as it is able to perform both actions with the same fluid.

Improved control

Double acting hydraulic cylinders offer better control over the movement of the load, as the hydraulic fluid can be controlled to move in both directions with precision. This ensures that the load is moved precisely as required, increasing safety and reducing the risk of damage.

Better durability

Double acting hydraulic cylinders are designed to withstand high pressure and heavy loads. They are also constructed to resist wear and corrosion, making them a durable and long-lasting solution.

Versatility

Double acting hydraulic cylinders can be used in a wide range of applications, from construction and manufacturing to mining and agriculture. They are available in a variety of sizes, shapes, and capabilities, which means they can be customized to suit specific application needs.

Cost-effective

Double acting hydraulic cylinders are a cost-effective solution for many applications. They require less maintenance than other types of cylinders and can operate with existing hydraulic systems, reducing the need for costly upgrades. Additionally, the efficiency of double acting cylinders means less energy is required overall, which can result in cost savings over time.

Cost-effective

Double acting hydraulic cylinders have a longer lifespan and require less maintenance, making them a cost-effective solution for industries that use hydraulic equipment. This also reduces the costs associated with downtime and maintenance.

Types of Double Acting Hydraulic Cylinders

Tie-Rod Cylinders

These cylinders are one of the most common types of double acting hydraulic cylinders. They feature a simple design and are made up of a cylinder barrel, a piston, piston rod, and end caps that are attached to the cylinder via tie-rods.

Welded Cylinders

These cylinders are similar to tie-rod cylinders, but their end caps are welded rather than attached using tie-rods. They are generally used in applications where the cylinder will be subjected to high operating pressures.

Telescopic Cylinders

These cylinders consist of several nested cylinders that extend and retract to provide a greater range of motion. They are commonly used in applications where space is limited.

Mill Type Cylinders

These cylinders are designed to withstand heavy loads and are commonly found in heavy duty applications, such as mining equipment and marine hydraulics.

Cushioned Cylinders

These cylinders feature a cushioned end cap that helps to eliminate shock and vibration. They are commonly used in applications where smooth operation is key, such as in machine tools and automation equipment.

Ram Cylinders

These cylinders consist of a piston rod that extends from the cylinder barrel and provides the linear motion. They are commonly used in applications where a shorter stroke is required.

Rotary Cylinders

These cylinders are used for providing rotary motion and are commonly found in applications such as machine tool indexing and turning applications.

What are the Working Theory of Double Acting Hydraulic Cylinders

Double-acting hydraulic cylinder
The characteristic of this hydraulic cylinder is that the piston and the rod body are a whole, the cross-sectional area of the piston in the left chamber is S1, the cross-sectional area of the piston in the right chamber is S2, and the cross-sectional area of the rod body is S3. The relationship between the three is S1=S2+S3.
Basic Hydraulic Cylinder
Push force, pull force, extension and retraction speed have the following relationship
Condition: P and Q remain unchanged.
F push=PS1, F pull=PS2=P (S1-S3), V stretch=Q/S1, V shrink=Q/S2=Q/(S1-S3),
Since S1>S2, F pushes>F pulls, and V stretches This kind of hydraulic cylinder has a simple structure and is mostly used in occasions that require high thrust, low tension, slow movement speed, and fast return, that is, heavy load out and no load back.

Floating hydraulic cylinder
The characteristic of this hydraulic cylinder is that the piston and the rod body are not integral, and can move on the rod body. The cross-sectional area of the piston is S2, and the cross-sectional area of the rod body is S3.
Floating hydraulic cylinder
Push force, pull force, extension and retraction speed have the following relationship
Condition: P and Q remain unchanged.
F push=PS3, F pull=PS2, V stretch=Q/S3, V shrink=Q/S2.
The relationship between S2 and S3 can be >, <, =, so F pushing can be >, <, = F pulling, V stretching can be >, <, = V shrinking
In practical applications, it is mostly the case that S3 is smaller than S2, which is different from ordinary hydraulic cylinders.
F push < F pull, V stretch > V pull
The purpose of doing this is to be different from the first hydraulic cylinder. This hydraulic cylinder is suitable for occasions requiring large pulling force and small thrust.

Differential hydraulic cylinder
The hydraulic cylinder of this structural form is an ordinary hydraulic cylinder, which is the first form. The difference is that the liquid supply method is different. When it is extended, the left chamber and the right chamber supply liquid at the same time, and when it is retracted, only the right chamber supplies liquid.
Differential structure
When stretching out, there is a pressure difference due to the different acting areas on both sides. Under the action of the thrust pressure difference, the rod moves to the right and stretches out, but the liquid discharged from the right chamber does not flow back to the liquid tank, but enters the left chamber together with the oil output from the hydraulic pump, thereby accelerating the stretching speed.
F push=PS1-PS2=PS3, when stretching out, the flow rate of the left chamber is the supply liquid flow rate Q+the flow rate of the right chamber QRight=VS2, so V=Q/S3, F pull=PS2, V contraction=Q/S2.
Compared with the first case, the pushing force has changed, but the pulling force has not changed.
Different results can be obtained by changing the area ratio of S1, S2, and S3.
This structure has been widely used in production, only need to add a differential valve.

Hydraulic Cylinder Two Ports Double Acting

Application of Double Acting Hydraulic Cylinders

Knifing in Paper-Making: Double-acting cylinders smoothly cut paper rolls on the fly, ensuring precision and speed.

Door Manufacturing: Used to assemble and glue panels, double-acting cylinders provide uniform pressure and controlled retraction.

Warehouse Conveyors: Arm-mounted cylinders efficiently handle items on conveyor belts, ensuring seamless operations.

Cage Washer: Sprayer-equipped cylinders facilitate thorough washing cycles in cage cleaning processes.

Hot Furnace Safety: Double-acting cylinders open furnace doors when necessary, prioritizing safety in extreme temperature environments.

Silk-Screening: Ensuring even ink coverage, double-acting cylinders power the sweeping motion of the silk-screening process.

Powder-Coating: Essential for uniform painting, these cylinders operate sprayer equipment both vertically and horizontally.
Beyond industrial machinery, double-acting cylinders are found in elevators, forklifts, car transport carriers, log-splitters, and even in funhouses or haunted houses to animate mannequins.

Components of Double Acting Hydraulic Cylinders

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Hydraulic cylinder barrel: The barrel is typically a seamless forged tube, which is ground and/or honed internally.

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Hydraulic cylinder base: The base is welded or screwed to the cylinder barrel, although the base of some cylinders can be with or without a flange.

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Hydraulic cylinder head: The head is typically attached with a screw connection, but can also be welded or attached to the barrel with a spring ring. The grooved inside of the cylinder head contains piston rod seals, a rod wiper and glands.

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Hydraulic cylinder piston: The piston divides the cylinders into two chambers. The piston is sealed with a piston seal guided with guide rings, which prevents the passing of the oil between the chambers. The pressure difference between both chambers triggers cylinder movement.

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Hydraulic cylinder piston rod: Piston rods are typically made from high–tolerance, hard chrome–plated cold–rolled steel. Piston rods are mounted onto the piston on one side and enter from the cylinder through the cylinder head on the other. An eye or flange is typically attached to the exterior side of the piston rod. Piston rods can be tempered, double chromed, hollow or stainless steel.

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Cylinder seals: There are several types of cylinder seals. They vary according to their shape, material and installation method, as well as the operating temperature range and pressure of the hydraulic cylinder.

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Rod end: The rod end is intended for connecting the cylinder to the load through the sliding bearing or bushes.

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Self locking nut: The self–locking nut is used for attaching the piston rod to the piston in certain types of applications.

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Spring ring: It is used to limit the stroke of the plunger cylinder and to mount the cylinder head (with a spring ring).

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Cylinder trunnion: For a pivotal installation of the cylinder.

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Cylinder flange: It is used in flange connection.

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Screw plug: Screw plugs protect the welded connections, and thus the interior of the cylinder, from impurities.

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Bushes: Bushes are usually built into the welded rod ends of the cylinders. There are steel and self–lubricating bushes.

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Sliding bearings: Sliding bearings are built into the cylinder heads that serve as a connection and attachment of the cylinder to the load.

When Choosing a Double Acting Hydraulic Cylinders, You Should Consider

When choosing single-acting or double-acting hydraulic cylinders for your hydraulic system, you need to make sure that cylinders will perform the desired work and functions. It does not make any sense to invest in a single-acting cylinder when it will not perform the required work. Nor does it make sense to invest in a double-acting cylinder when a single-acting cylinder will meet your needs.

For example, if you need to move whatever is connected to the cylinders in two directions, then a double-acting cylinder is best. On the other hand, if you need to move the piston rod in a single direction and can rely on gravity or a spring for retraction, then a single-acting cylinder would be a good choice.

Hydraulic pipes of heavy industry machine.Next, you do need to consider the system design and what other hydraulic parts and components you will need. For example, with double-acting system designs, you need to remember to include the costs of installing 2-, 3-, or 4-way valve controls and pumps. Furthermore, you will need to run two hoses to each cylinder.

In addition, some system designs could use a combination of single-acting and double-acting cylinders depending on the system’s functions and applications. Last, you want to choose hydraulic cylinders that are built with high-quality parts and components that meet industry standards.

Maintenance Tips for Double Acting Hydraulic Cylinders

Keep the hydraulic fluid clean

Dirty fluid is one of the top causes of hydraulic cylinder failure. When contaminants pass through the cylinder, they can damage the surfaces of the bore and rod along with seals and fittings. The larger the particles are the more severe the damage. Monitor and change filters and fluid as required..

Monitor the pressure level inside the cylinder

Pressure is created by the hydraulic system so that the desired work can be completed. You could install a pressure gauge to monitor variations in pressure that are outside normal operating parameters. If you notice a variation in pressure from the norm shut the system down and do a full inspection.

Be aware of the added stress on cylinders from side loads

Side loads occur when the cylinder is operated and is doing work that is perpendicular to the direction the cylinder moves, this is referred to as side-loading. Side loads place additional stress on the cylinder and hydraulic cylinder parts, if they are too excessive they will cause damage such as bending the rod or deforming the cylinder.

Check hydraulic cylinder seals and fittings for leaks

Another common cause of cylinder failure is when the seals and fittings leak fluid. When fluid leaks, all sorts of things can go wrong, from overheating and loss of power and therefore function especially if the leak is from the high pressure to the low pressure side of the piston.

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Frequently Asked Questions Double Acting Hydraulic Cylinders

Q: What is the principle of double-acting hydraulic cylinder?

A: A double acting cylinder alternates cycles of pressurized fluid to both sides of the piston and creates extend and retract forces to move the piston rod, permitting more control over the movement.

Q: What are the characteristics of a double-acting cylinder?

A: A double-acting hydraulic cylinder has a port at each end, supplied with hydraulic fluid for both the retraction and extension of the piston. A double-acting cylinder is used where an external force is not available to retract the piston or it can be used where high force is required in both directions of travel.

Q: How do you control a double-acting hydraulic cylinder?

A: Hook-up is easy—just connect supply pressure to the port labeled supply, and connect the cylinder extend and cylinder retract to the double acting cylinder. Turn the air on, flip the toggle, and make cylinder speed and delay adjustments as desired.

Q: What is the advantage of using a double-acting cylinder?

A: Advantages of Double Acting Cylinder:
More control over movement since pressurized air moves both ways. Faster, stronger and use less energy. Offer more design variation: stroke and bore sizes. Many double acting pneumatic cylinders are ISO compliant as opposed to single pneumatic cylinders.

Q: How does a double-acting cylinder retract?

A: Routing pressurized fluid into the rod end of a double-acting cylinder causes the piston rod to retract. Conversely, routing pressurized fluid into the cap end causes the rod to extend. Simultaneously, fluid on the opposite side of the piston flows back into the hydraulic reservoir.

Q: Where would you use a double-acting cylinder?

A: Because double-acting pneumatic cylinders are very versatile, they can be used for: Opening and closing a gate, carwash, or loading dock doors. Opening and closing valves. Moving items onto or off of conveyors.

Q: Which valve is normally used to control a double-acting cylinder?

A: 5/2 solenoid valves and 5/3 solenoid valves are most often used as directional control valves for double-acting pneumatic actuators. The single-coil type of 5/2 valve usually has a spring or pilot air return so that when de-energised, the valve returns to it's starting function.

Q: How do I know if my hydraulic cylinder is double-acting?

A: What are Single Acting & Double Acting Hydraulic Cylinders ...
A Double Acting cylinder uses hydraulic power to both extend and retract. A simple way to tell the cylinders apart is by looking at the number of ports. A Single Acting cylinder will have one port for the connection of a hydraulic cylinders Hydraulic Hose Fittings A Double Acting cylinder will have TWO ports.

Q: How do we remove air trapped in a hydraulic system?

A: Open the bleed valve by turning it counterclockwise until it is fully open. Allow the air to escape. You may notice bubbles in the fluid as the air escapes from the system. Leave the valve open until no more air is visible in the fluid.

Q: Why a 5 2 valve is used for a double-acting cylinder?

A: 5/2 pneumatic valves are used for controlling double acting pneumatic cylinders. They have 2 output ports, commonly designated A & B or 2 & 4. They have one inlet port, designated P or 1, and two exhaust ports, designated R & S or 3 & 5.

Q: Do double-acting cylinders have two ports?

A: This is where the hydraulic fluid enters and forces the plunger out in one direction. A double-acting cylinder includes two ports. One for the hydraulic fluid to enter and extend the plunger, and the other for retracting the cylinder.

Q: Does a double-acting cylinder have a spring?

A: A double acting cylinder functions a little bit differently from a single acting cylinder. In this type of hydraulic cylinder, hydraulic fluid is used to utilize pressure onto both sides of the piston permitting for both extension and compression with no help from any sort of spring, crank, or device.

Q: What is the pneumatic control of a double-acting cylinder?

A: Double-Acting Cylinder
Filtered air feeds the solenoid valve, which is usually energized by a 24 V dc PLC output. This activates the valve and lets air leave through port B and flow freely through the flow control to extend the cylinder rod and plunger to the left.

Q: What is two main causes of failure of hydraulic?

A: Air and water contamination are the leading causes of hydraulic failure, accounting for 80 to 90% of hydraulic failures. Faulty pumps, system breaches or temperature issues often cause both types of contamination.

Q: What is a double acting hydraulic cylinder?

A: A double acting hydraulic cylinder is a type of hydraulic cylinder that uses hydraulic fluid to move the cylinder in two directions. It utilizes hydraulic pressure to extend and retract the piston rod, allowing it to perform work in both directions.

Q: What are the advantages of using a double acting hydraulic cylinder?

A: The main advantage of using a double acting hydraulic cylinder is that it can perform work in both directions, which makes it more versatile than a single acting cylinder. It also provides greater control over the speed and force of the cylinder, allowing for more precise and efficient operation.

Q: What are some common applications of double acting hydraulic cylinders?

A: Double acting hydraulic cylinders are commonly used in a wide range of applications, including agriculture, construction equipment, material handling, and transportation. They are also commonly used in industrial machinery to perform various tasks such as lifting, pushing, pulling, and bending.

Q: What are the different types of double acting hydraulic cylinders?

A: There are three main types of double acting hydraulic cylinders: tie-rod cylinders, welded cylinders, and compact cylinders. Tie-rod cylinders are the most common type and are ideal for heavy-duty applications. Welded cylinders are designed for smaller applications where space is limited. Compact cylinders are lightweight and are ideal for applications such as robotics.

Q: How should I maintain my double acting hydraulic cylinder?

A: Regular maintenance is important to keep your hydraulic cylinder in good working order. This includes checking the seals, replacing worn or damaged parts, and keeping the hydraulic fluid at the correct level and viscosity. It is also important to follow the manufacturer's recommended maintenance schedule and to use the correct type of hydraulic fluid.

Q: What happens if you get air in a hydraulic system?

A: When air contaminates a hydraulic fluid, usually via the pump's inlet, aeration, cavitation, or foaming can occur. Aeration is bad news, as it degrades the hydraulic fluid causing damage to the components of the system due to loss of lubrication, resulting in overheating and burning of the seals.

Tonghesheng Machinery is one of the competitive manufacturers and suppliers of high-quality double acting hydraulic cylinders, and we are also equipped with a professional factory, welcome to buy double acting hydraulic cylinders products from our company.