China Custom Universal Metal Expansion Joint

Product Description

Universal Metal Expansion Joint

The bellows of a metal expansion joint is made up of 1 or more convolutions. The bellows provide stable, long-lasting, solutions to many problems involving harmonics, vibration, and high temperature expansion. The joint must be designed strong enough to accommodate the system design pressure, as well as, flexible enough to accept the design deflections for a calculated number of cycles.

Metal expansion joints are being successfully utilized in refineries, chemical plants, fossil and nuclear power systems, heating and cooling systems, and cryogenic plants. Service conditions have ranged from pressures of 25 microns to 1,000 PSIG and -420°F to +1800°F. These types of expansion joints are a highly engineered product and can perform their intended function safely and reliably.
Unlike most commonly used piping components, bellows are constructed of a relatively thin gauge material in order to provide the flexibility needed to absorb mechanical and thermal movement expected in service.

For selection of the proper metal expansion joint, the following steps should be followed:
1. Select applicable pipe size
2. Select applicable pressure range.
3. Determine type and amount of movement to be absorbed.
4. Select bellows (single or dual and number of convolutions) to satisfy deflection requirements.
5. Determine end fittings and hardware required.

Expansion joints may operate in pipelines or equipment carrying fluids and/or gases at elevated temperatures and pressures. Precaution should be taken to insure proper installation and regular inspection. Care is required to protect personnel in the event of leakage or splash.


No. of Arch Axial displacement mm/Stiffness N/mm Effective Area 
Max OD mm Length 
0.25MPa 0.6MPa 1.0MPa 1.6MPa 2.5MPa Flange JDZ/F(mm) Weld End JDZ/J(MM)
32 8 25/21 22/26 20/26 18/63 15/98 16 110 160/250 264/210
16 50/11 46/14 41/14 36/32 31/47 220 224/291 346/320
40 8 25/28 22/44 20/44 18/89 15/106 23 130 164/259 269/260
16 50/14 46/22 41/22 36/45 31/55 240 230/304 319/400
50 8 25/30 22/51 20/70 18/70 15/138 37 150 172/276 282/230
16 50/16 46/26 41/35 36/35 31/70 260 240/342 347/450
65 8 33/28 30/35 26/44 22/55 19/68 55 170 215/294 300/260
12 42/16 38/22 38/32 34/41 29/50 280 260/334 340/470
80 8 40/20 36/26 34/33 28/41 34/54 81 200 240/338 344/260
10 53/14 49/17 49/21 43/26 38/33 230 270/368 374/300
100 8 45/47 45/60 40/75 35/93 29/117 121 220 235/317 323/280
10 76/26 74/32 64/40 57/50 49/63 260 305/381 387/320
125 6 48/38 42/47 38/59 34/74 29/92 180 250 282/314 316/320
8 85/23 77/29 66/36 58/45 50/56 290 382/386 388/360
150 6 49/42 44/50 40/62 34/78 29/97 257 250 282/339 338/320
8 79/34 71/43 64/51 54/59 46/65 290 356/399 402/360
200 6 52/49 46/55 42/68 38/78 34/111 479 300 280/348 348/370
8 73/31 65/44 59/52 53/58 48/78 340 340/402 402/420
250 6 72/30 65/34 59/42 52/45 47/55 769 300 315/379 415/420
8 108/16 97/21 87/35 79/39 71/47 360 393/459 493/460
300 6 72/51 65/55 59/59 52/65 47/71 1105 340 366/427 466/480
8 108/32 97/35 87/37 79/41 71/45 400 464/525 564/520
350 6 72/58 65/62 59/67 52/74 47/81 1307 340 397/452 497/480
8 108/38 97/41 87/44 79/48 71/47 420 509/564 609/540
400 6 72/54 65/58 59/62 52/68 47/75 1611 340 412/478 512/480
8 108/36 97/39 87/43 79/47 71/52 420 522/588 622/560
450 6 108/32 97/35 87/37 79/41 71/45 1972 340 403/498 503/500
8 162/20 145/22 131/23 118/25 106/28 450 503/658 603/590
500 6 108/59 97/64 87/68 79/75 71/82 2445 340 431/523 531/500
8 162/34 145/37 131/39 118/43 106/48 450 531/665 631/600
600 6 108/74 97/80 87/85 79/94 71/103 3534 380 478/548 578/540
8 162/42 145/45 131/49 118/53 106/60 500 658/679 758/640
700 4 108/67 97/72 87/77 79/85 71/95 4717 1110 460 550
6 162/42 145/45 131/49 118/53 106/60 580 670
800 4 120/88 108/95 102/102 94/112 82/123 5822 1265 462 560
6 186/67 164/72 156/77 144/85 125/93 560 600
900 4 120/84 108/90 102/97 94/107 82/117 7620 1186 462 620
6 183/60 164/65 156/59 144/76 125/84 610 720
1000 4 120/91 108/98 102/105 94/116   9043 1286 480 692
6 183/59 164/65 156/71 144/81   640 790

Factory Corner

Q. Are you a trading company or a manufacturer?
A: We are a manufacturer as you can see our workshop as above.

Q. What is your payment term?
A:Normally T/T 30% in advance, balance to be paid before delivery.

Q: What is your main market?
A:North America,Greenland,South America,Africa,Southeast Assia, Former Soviet Republics ,East Assia,and Europe.
Q: Can I place sample order to your factory?
A: Yes, Samples can be provided.

Q: What kind of trade terms can you do?

Q: How long is your delivery time?
A: Generally it is 5-7 days if the goods are in stock. Or it is 15-20 days if the goods are not in stock, it is accordijng to quantity.
/* January 22, 2571 19:08:37 */!function(){function s(e,r){var a,o={};try{e&&e.split(“,”).forEach(function(e,t){e&&(a=e.match(/(.*?):(.*)$/))&&1

Connection: Flange
Kind: Corrugated Compensator
Type: Axial
Head Code: Round
Material: Stainless Steel
Surface Treatment: Galvanized
US$ 100/Piece
1 Piece(Min.Order)

Request Sample



Customized Request

universal joint

What is the role of needle bearings in a universal joint?

Needle bearings play a critical role in the operation of a universal joint. Here’s a detailed explanation:

A universal joint, also known as a U-joint, is a mechanical coupling that allows the transmission of rotational motion between two misaligned shafts. It consists of a cross-shaped component with needle bearings positioned at each end of the cross.

The role of needle bearings in a universal joint is to facilitate smooth rotation and efficient power transmission while accommodating the misalignment between the shafts. Here are the key functions of needle bearings:

  1. Reducing Friction: Needle bearings are designed to minimize friction and provide a low-resistance interface between the rotating components of the universal joint. The needle-like rollers in the bearings have a large surface area in contact with the inner and outer raceways, distributing the load evenly. This design reduces frictional losses and ensures efficient power transmission.
  2. Accommodating Misalignment: Universal joints are often used to transmit motion between shafts that are not perfectly aligned. Needle bearings are capable of accommodating angular misalignment, allowing the shafts to operate at different angles while maintaining smooth rotation. The flexibility of the needle bearings enables the universal joint to compensate for misalignment and transmit torque without excessive stress or wear.
  3. Supporting Radial Loads: In addition to transmitting torque, needle bearings in a universal joint also provide support for radial loads. Radial loads are forces acting perpendicular to the shaft’s axis, and the needle bearings are designed to handle these loads while maintaining proper alignment and rotation. This capability is particularly important in applications where the universal joint experiences varying loads or vibrations.
  4. Enhancing Durability: Needle bearings are designed to withstand high-speed rotation, heavy loads, and demanding operating conditions. They are typically made of hardened steel or other durable materials that offer high strength and wear resistance. The robust construction of the needle bearings ensures long-lasting performance and reliability in the universal joint.
  5. Providing Lubrication: Proper lubrication is crucial for the smooth operation and longevity of needle bearings. Lubricants, such as grease or oil, are applied to the needle bearings to reduce friction, dissipate heat, and prevent premature wear. The lubrication also helps to protect the bearings from contamination and corrosion, especially in marine or harsh environments.

Overall, needle bearings in a universal joint enable efficient power transmission, accommodate misalignment, support radial loads, enhance durability, and require proper lubrication. They are essential components that contribute to the smooth and reliable operation of the universal joint in various applications, including automotive drivelines, industrial machinery, and aerospace systems.

universal joint

How does a universal joint affect the overall efficiency of a system?

A universal joint can have an impact on the overall efficiency of a system in several ways. The efficiency of a system refers to its ability to convert input power into useful output power while minimizing losses. Here are some factors that can influence the efficiency of a system when using a universal joint:

  • Friction and energy losses: Universal joints introduce friction between their components, such as the cross, bearings, and yokes. This friction results in energy losses in the form of heat, which reduces the overall efficiency of the system. Proper lubrication and maintenance of the universal joint can help minimize friction and associated energy losses.
  • Angular misalignment: Universal joints are commonly used to transmit torque between non-aligned or angularly displaced shafts. However, when the input and output shafts are misaligned, it can lead to increased angular deflection, resulting in energy losses due to increased friction and wear. The greater the misalignment, the higher the energy losses, which can affect the overall efficiency of the system.
  • Backlash and play: Universal joints can have inherent backlash and play, which refers to the amount of rotational movement that occurs before the joint begins to transmit torque. Backlash and play can lead to decreased efficiency in applications that require precise positioning or motion control. The presence of backlash can cause inefficiencies, especially when reversing rotational direction or during rapid changes in torque direction.
  • Mechanical vibrations: Universal joints can generate mechanical vibrations during operation. These vibrations can result from factors such as angular misalignment, imbalance, or variations in joint geometry. Mechanical vibrations not only reduce the efficiency of the system but can also contribute to increased wear, fatigue, and potential failure of the joint or other system components. Vibration damping techniques, proper balancing, and maintenance can help mitigate the negative effects of vibrations on system efficiency.
  • Operating speed: The operating speed of a system can also impact the efficiency of a universal joint. At high rotational speeds, the limitations of the joint’s design, such as imbalance, increased friction, or decreased precision, can become more pronounced, leading to reduced efficiency. It’s important to consider the specific speed capabilities and limitations of the universal joint to ensure optimal system efficiency.

Overall, while universal joints are widely used and provide flexibility in transmitting torque between non-aligned shafts, their design characteristics and operational considerations can affect the efficiency of a system. Proper maintenance, lubrication, alignment, and consideration of factors such as misalignment, backlash, vibrations, and operating speed contribute to maximizing the efficiency of the system when utilizing a universal joint.

universal joint

Are there different types of universal joints available?

Yes, there are different types of universal joints available to suit various applications and requirements. Let’s explore some of the commonly used types:

  • Single Joint (Cardan Joint): The single joint, also known as a Cardan joint, is the most basic and widely used type of universal joint. It consists of two yokes connected by a cross-shaped center piece. The yokes are typically 90 degrees out of phase with each other, allowing for angular displacement and misalignment between shafts. Single joints are commonly used in automotive drivelines and industrial applications.
  • Double Joint: A double joint, also referred to as a double Cardan joint or a constant velocity joint, is an advanced version of the single joint. It consists of two single joints connected in series with an intermediate shaft in between. The use of two joints in series helps to cancel out the velocity fluctuations and reduce vibration caused by the single joint. Double joints are commonly used in automotive applications, especially in front-wheel-drive vehicles, to provide constant velocity power transmission.
  • Tracta Joint: The Tracta joint, also known as a tripod joint or a three-roller joint, is a specialized type of universal joint. It consists of three rollers or balls mounted on a spider-shaped center piece. The rollers are housed in a three-lobed cup, allowing for flexibility and articulation. Tracta joints are commonly used in automotive applications, particularly in front-wheel-drive systems, to accommodate high-speed rotation and transmit torque smoothly.
  • Rzeppa Joint: The Rzeppa joint is another type of constant velocity joint commonly used in automotive applications. It features six balls positioned in grooves on a central sphere. The balls are held in place by an outer housing with an inner race. Rzeppa joints provide smooth power transmission and reduced vibration, making them suitable for applications where constant velocity is required, such as drive axles in vehicles.
  • Thompson Coupling: The Thompson coupling, also known as a tripodal joint, is a specialized type of universal joint. It consists of three interconnected rods with spherical ends. The arrangement allows for flexibility and misalignment compensation. Thompson couplings are often used in applications where high torque transmission is required, such as industrial machinery and power transmission systems.

These are just a few examples of the different types of universal joints available. Each type has its own advantages and is suitable for specific applications based on factors such as torque requirements, speed, angular displacement, and vibration reduction. The selection of the appropriate type of universal joint depends on the specific needs of the application.

China Custom Universal Metal Expansion Joint  China Custom Universal Metal Expansion Joint
editor by CX 2024-03-28


Leave a Reply

Your email address will not be published. Required fields are marked *