China high quality 2X26 Hydraulic Cylinders Popular Double Acting 3000 CZPT Cylinders Manufacturer Sale a/c vacuum pump

Product Description

 

All sizes are avaliable for choosing

About Us

Established in    1988   , HangZhou LD Machinery Co, LTD. (hereinafter referred to “LD”) is a leading manufacturer specializing in the design, research, development, manufacture and marketing in the hydraulic industry. Being one of major suppliers of customized components and cylinders for manufacturers spreaded all over the world, the company is committed to offer high quality products with competitive prices and excellent service worldwide.

Headquartered in HangZhou City, ZHangZhoug Province, the company wholly owns a subsidiary production factory named “HangZhou YUEWEI Hydraulic Technology Co., Ltd”, which covers an area of more than     380,000 square meters   , possesses abundant technical strength and sound production management system, superior machining production equipment, strict and effective quality control system, advanced and excellent inspection instruments.

More than     35    years experience in machining industry, with over     10    experienced technical engineers and     150    skilled workers, LD has a senior engineering technical team with special skills and rich experience in product design, casting, forging, and CNC machining, can handle special material, structure, defect and processing, meet the evolving needs, and provide optimal solution and real one-stop service to customers.
 

Hydraulic Cylinder Producing Process

Step1: Quality Control on Raw Material
We have our own lab in factory, inspect the raw material and do the test. For every batch of material we received, we will ask supplier provide their certificate, and then cut them to do the test again to see if the results match the certification. Also, every batch we received, we will cut them into pieces to check the air bubbles. Once they are all qualified, we will accept it, and all detail information will be recording in our ERP system. We will also pay lot of attention on the salt spray test for chrome rod. Every month, we will cut the material, put them into test machine to see if it reach the requirement. All the result will be recorded at our QC department. If customer need, we can provide it.

Step2: Quality Control on Machining

we start doing components machining from 1988 with 36 years experience now and insist doing 100% inspection. We spend lots of money, invest on auto robots and machines. Now half of the producing line is by robot so that we can ensure our quality be stable good. For every part of the cylinder, we do 3 times inspecting. Firstly, workers will do self inspection. Secondly, we have tour-hour inspection checking the products, 2 times in the morning and 2 times in the afternoon, make sure that every step is good. After the products are all completed, we will do 100% inspection. For thread, for the tolerance, everything, we need double check. Also, we have specific warehouse just for the measuring tools. Every inspector have their own measuring tool and we will check the measuring tools regularly to make sure they are all in good condition, so that the measuring results will be convincing.

Step3: Quality Control on Welding

We are qualified to AWS certification, which is very popular in North American market. First, for the visual test, we will make sure that every components are welded good, look beautiful. And the second, we need to check the penetration. We have more than 15 years experience, we do know what kind of designing angle can make the cylinder welding strong. Once we finish the first article, we will cut it and analyse the welding to see if it is fulfill the groove. And then do the radiographic testing to make sure there is no gap inside. What’s more, we will do the ultrasonic test to check the program for the robot. Now 80% of welding is doing by robot. Once the program confirmed, no 1 can change it unless the welding manager, and they only have 5% right.

Step4: Quality Control on Assembling
For assembling, we have some difference with others. The brand we uses for seals are all those famous brand like Aston, Parker, Hallite. The cylinder we give to our customer has 2 years warranty. For our company, we engrave our part number and manufacturing date for the quality warranty. So no matter for seals or any others, as long as they are parts of cylinder, if it is under 2 years, we will take responsibility for them. And we will do the test for every cylinder like for pressure after we finish assembling.

Step5: Quality Control on Painting
We have our half auto painting line. Right now, we can paint about 1500 cylinders per day, which is about 1 container. Before we do the painting, we will do the wash first and for every cylinder, we will test for hardness, thickness and adhesion to make sure the painting are all good, which will be recorded into OQC report, print out and stick on the box, ship to you with your products.

Step6: Hydraulic Cylinder Packing
For every cylinder, we have the stick to show the detail information like bore size, stroke and working pressure. And we will use individual plastic bag packing. If customer need, we can also use individual carton box packing. We will fasten 1 floor after 1 floor with plat, so customer can only cut what they need and other layer will still be fasten. Moreover, there will be plywood pallet or plywood box for customer choosing. We will also send the loading picture to customer after we ship them to make sure everything is well loaded in China.

Packing Reference

Order Process

Enterprise Features

FAQ
Q1. What is LD product’s quality assurance?
100% inspection for each product before shipping with inspection rereport for tracking.

Q2: How long is the warranty on LD products?
The warranty is 2 years for general products since the date of shipment.

Q3: How LD deal with the quality problem during warranty period?
1. LD will take the corresponding cost caused by customer local reparing. 
2. LD will provide the product by free if the repair cost is higher than the product value, but the freight involved shall be borne by customer side.

Q4: How to ensure the order can be shipped on time?
LD will send the “production schedule” every week after receiving customers’ orders. If any delays, LD will inform customers 3 weeks in advance, so as to facilitate the customer to arrange the schedule.

Q5: Does LD offer delivery service?
Yes. LD has deep cooperation with logistics companies all over the world to provide customers with quick and convenient “Door-to-Door services”,including sea, air and express.

Q6: How LD control the product quality?
1. Raw materials: We will test the material of each batch of raw materials we receive, and the piston rod will be tested with salt spray. This is to ensure that the material of our products meets the requirements at the beginning.
2. Processing: We have the leading machining equipment, and obtained ISO9001 certification.
3. Welding: Our factory is equipped with welding robots, and has obtained the AWS certification.
4. Assembly pressure test: 100% testing with OQC report for cHangZhou. The seals we use are: Hallite, Aston and Gapi

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Certification: ISO9001
Pressure: Low Pressure
Work Temperature: Normal Temperature
Acting Way: Double Acting
Working Method: Straight Trip
Adjusted Form: Regulated Type
Samples:
US$ 200/Piece
1 Piece(Min.Order)

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Customization:
Available

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double acting hydraulic cylinder

How does a double-acting hydraulic cylinder contribute to controlled and precise movement?

A double-acting hydraulic cylinder plays a crucial role in achieving controlled and precise movement in hydraulic systems. Here’s a detailed explanation:

1. Bi-Directional Operation: Double-acting hydraulic cylinders are designed to generate force in both directions. By supplying pressurized hydraulic fluid to the cap end of the cylinder, the piston extends and produces force. Conversely, supplying fluid to the rod end retracts the piston. This bi-directional operation allows for precise control over the movement of loads in both directions, enabling controlled and precise positioning.

2. Adjustable Force Output: The force output of a double-acting hydraulic cylinder can be adjusted by controlling the hydraulic pressure applied to the cylinder. By regulating the pressure in the hydraulic system, the force generated by the cylinder can be varied to match the specific load requirements. This adjustability allows for precise control over the force exerted by the cylinder, contributing to controlled and precise movement.

3. Flow Control: Double-acting hydraulic cylinders can incorporate flow control valves or throttle valves in the hydraulic circuit. These valves regulate the flow rate of hydraulic fluid entering or exiting the cylinder, controlling the speed of movement. By adjusting the flow rate, the movement of the cylinder can be slowed down or sped up, allowing for precise control over the speed of operation. This flow control capability enhances the controlled and precise movement of the cylinder.

4. Position Feedback Devices: To achieve precise movement, double-acting hydraulic cylinders can be equipped with position feedback devices, such as linear transducers or potentiometers. These devices provide real-time information about the position of the cylinder’s piston. The position feedback data can be used to accurately control the movement and position of the load, ensuring precise positioning and movement control.

5. Proportional Control: Double-acting hydraulic cylinders can be integrated into proportional control systems. Proportional control utilizes electronic or electro-hydraulic systems to proportionally regulate the hydraulic pressure and flow, allowing for fine control over the cylinder’s movement. This precise control mechanism enables accurate and controlled movement, making it suitable for applications that require precise positioning or synchronization of multiple cylinders.

6. System Stability: Double-acting hydraulic cylinders contribute to controlled and precise movement by providing system stability. The hydraulic fluid acts as an incompressible medium, transmitting force from the cylinder to the load without significant loss or deformation. This stability ensures that the movement of the cylinder is consistent and predictable, allowing for precise control over the load’s position.

7. Mechanical Advantage: Double-acting hydraulic cylinders leverage mechanical advantage to enhance controlled and precise movement. The design of the cylinder incorporates a larger surface area on the cap end of the piston compared to the rod end. This size difference creates a force amplification effect, enabling the cylinder to exert greater force during the extension stroke. This mechanical advantage allows for finer control over the movement and positioning of the load.

By combining bi-directional operation, adjustable force output, flow control, position feedback devices, proportional control, system stability, and mechanical advantage, double-acting hydraulic cylinders contribute to controlled and precise movement in a wide range of applications.

double acting hydraulic cylinder

Can double-acting hydraulic cylinders be used in automotive repair and maintenance?

Yes, double-acting hydraulic cylinders can be extensively used in automotive repair and maintenance. Here’s a detailed explanation:

1. Lifting and Lowering Vehicles: Double-acting hydraulic cylinders are commonly employed in automotive lifts and jacks for lifting and lowering vehicles. These cylinders provide the necessary force to raise vehicles off the ground, allowing mechanics to access the underside of the vehicle for repairs, maintenance, or inspections. The bidirectional force generation of double-acting cylinders enables precise control over the lifting and lowering process, ensuring the safety and stability of the vehicle during automotive tasks.

2. Pressing and Clamping: Automotive repair often involves pressing or clamping components together during assembly or disassembly processes. Double-acting hydraulic cylinders can be used in hydraulic presses or clamping devices to provide the required force. By supplying hydraulic pressure to one side of the cylinder, the piston extends, applying force to press or clamp components together. By supplying pressure to the other side, the piston retracts, releasing the pressure. This capability allows for precise and controlled pressing or clamping operations in automotive repair and maintenance.

3. Brake and Suspension System Maintenance: Double-acting hydraulic cylinders play a vital role in brake and suspension system maintenance. For example, when bleeding brake lines, a hydraulic cylinder can be used to pressurize the brake system and force the air bubbles out of the brake fluid. Similarly, in suspension system maintenance, hydraulic cylinders can be employed to compress or decompress suspension components, facilitating repairs or replacements. The precise force control offered by double-acting cylinders ensures accurate and effective maintenance of these critical automotive systems.

4. Engine Hoists and Tilters: Engine repair and maintenance often require lifting, tilting, or removing heavy engines from vehicles. Double-acting hydraulic cylinders are utilized in engine hoists and tilters to provide the necessary force for these tasks. The cylinders can be integrated into lifting mechanisms, allowing controlled lifting and tilting of engines for access to various components or for engine removal and installation. The precise force application of double-acting cylinders ensures the safe handling of heavy engine assemblies.

5. Wheel Alignment and Balancing: Double-acting hydraulic cylinders are also used in wheel alignment and balancing equipment. These cylinders provide the force required to adjust wheel angles and balance tires accurately. By applying precise force to the wheel clamps or alignment mechanisms, the cylinders enable mechanics to align wheels correctly and achieve balanced tire rotations, ensuring optimal vehicle performance, safety, and tire longevity.

Given their applications in lifting and lowering vehicles, pressing and clamping operations, brake and suspension system maintenance, engine hoisting and tilting, as well as wheel alignment and balancing, double-acting hydraulic cylinders are indispensable in automotive repair and maintenance. Their precise force control and versatility make them valuable tools for mechanics and technicians in the automotive industry.

double acting hydraulic cylinder

How does a double-acting hydraulic cylinder differ from a single-acting one?

A double-acting hydraulic cylinder and a single-acting hydraulic cylinder differ in their functionality and ability to generate force. Here’s a detailed explanation of the differences:

1. Functionality: A double-acting hydraulic cylinder can generate force in both directions of its stroke, whereas a single-acting hydraulic cylinder can only generate force in one direction.

2. Construction: In a double-acting hydraulic cylinder, there are two hydraulic ports—one connected to the rod end and the other to the cap end of the cylinder. This allows hydraulic fluid to enter and exit both chambers of the cylinder, enabling force generation in both directions. In contrast, a single-acting hydraulic cylinder has only one hydraulic port, typically connected to the cap end. The rod end of a single-acting cylinder is often vented or equipped with a smaller hydraulic port to facilitate the return of the piston.

3. Operation: A double-acting hydraulic cylinder operates by supplying hydraulic fluid to the appropriate ports to extend or retract the piston. By controlling the flow and pressure of the hydraulic fluid, operators can regulate the direction and speed of the piston’s movement, generating pushing and pulling forces. In a single-acting hydraulic cylinder, hydraulic fluid is supplied to the port to extend the piston and generate force in one direction. The return stroke of the piston is accomplished by the force of gravity or an external mechanical load, as there is no hydraulic pressure applied to retract the piston.

4. Applications: Due to their ability to generate force in both directions, double-acting hydraulic cylinders are suitable for applications that require bidirectional force, precise control, and versatility. They are commonly used in tasks such as lifting, pushing, pulling, clamping, and more. Single-acting hydraulic cylinders, on the other hand, are often employed in applications where force is required in only one direction, such as in simple lifting or lowering tasks.

5. Efficiency: Double-acting hydraulic cylinders offer improved efficiency compared to single-acting cylinders in applications that require frequent or continuous bidirectional force. With a double-acting cylinder, the force can be applied in both the extension and retraction strokes, allowing for increased productivity and reduced cycle times.

In summary, the main difference between a double-acting hydraulic cylinder and a single-acting hydraulic cylinder lies in their ability to generate force in one or both directions. While a double-acting cylinder can generate force in both directions, a single-acting cylinder can generate force in only one direction. This distinction impacts their construction, operation, applications, and efficiency in various hydraulic systems.

China high quality 2X26 Hydraulic Cylinders Popular Double Acting 3000 CZPT Cylinders Manufacturer Sale   a/c vacuum pump		China high quality 2X26 Hydraulic Cylinders Popular Double Acting 3000 CZPT Cylinders Manufacturer Sale   a/c vacuum pump
editor by CX 2024-03-27