Product Description
SDSX Grooved Rigid Coupling
Systems & Performance
SDSX Grooved mechanical couplings(GMC) are available in both rigid and flexible models.
A rigid coupling is used in applications where a rigid joint is desired,similar to that of a traditional flanged,welded ,or threaded connection.
To be considered rigid,a coupling would allow less than 1 degree of deflection or angular movement
Description
SDSX rigid coupling is designed from 1″-12″, and pressure is 300psi/2070 kPa.
Bolts/Nuts: Heat-treated plated carbon steel, meeting its mechanical properties Grade 8.8.
Gaskets: EPDM, silicon rubber and Nitrile rubber.
Dimensions
| Nominal Size mm/in |
Pipe O.D mm/in |
Working Pressure PSI/MPa |
Bolt Size | Dimensions mm/in | ||
| No.-Size mm | Ø | L | H | |||
| 25 1 |
33.7 1.327 |
300 2.07 |
2-3/8*45 | 60 2.362 |
102 4.016 |
45 1.772 |
| 32 1¼ |
42.4 1.669 |
300 2.07 |
2-3/8*45 | 70 2.756 |
106 4.173 |
44 1.732 |
| 40 1½ |
48.3 1.900 |
300 2.07 |
2-3/8*45 | 73 2.874 |
108 4.252 |
44 1.732 |
| 50 2 |
57.0 2.245 |
300 2.07 |
2-3/8*55 | 83 3.268 |
122 4.803 |
45 1.772 |
| 50 2 |
60.3 2.375 |
300 2.07 |
2-3/8*55 | 87 3.425 |
123 4.843 |
44 1.732 |
| 65 2½ |
73.0 2.875 |
300 2.07 |
2-3/8*55 | 100 3.937 |
138 5.433 |
44 1.732 |
| 65 2½ |
76.1 3.000 |
300 2.07 |
2-3/8*55 | 103 4.055 |
142 5.591 |
45 1.772 |
| 80 3 |
88.9 3.500 |
300 2.07 |
2- 1/2*60 | 117 4.606 |
166 6.535 |
45 1.772 |
| 100 4 |
108.0 4.250 |
300 2.07 |
2- 1/2*65 | 137 5.393 |
188 7.401 |
48 1.889 |
| 100 4 |
114.3 4.500 |
300 2.07 |
2- 1/2*65 | 139 5.472 |
190 7.480 |
49 1.929 |
| 125 5 |
133.0 5.250 |
300 2.07 |
2- 1/2*75 | 163 6.417 |
210 8.268 |
49 1.929 |
| 125 5 |
139.7 5.500 |
300 2.07 |
2- 1/2*75 | 168 6.614 |
218 8.583 |
49 1.929 |
| 150 6 |
159.0 6.250 |
300 2.07 |
2- 1/2*75 | 192 7.559 |
242 9.528 |
49 1.929 |
| 150 6 |
165.1 6.500 |
300 2.07 |
2- 1/2*75 | 193 7.598 |
241 9.488 |
49 1.929 |
| 150 6 |
168.3 6.625 |
300 2.07 |
2- 1/2*75 | 198.5 7.815 |
249 9.803 |
50 1.969 |
| 200 8 |
219.1 8.625 |
300 2.07 |
2-5/8*85 | 253 9.961 |
320 12.598 |
59 2.323 |
| 250 10 |
273 10.748 |
300 2.07 |
2-7/8*130 | 335 13.189 |
426 16.772 |
68 2.677 |
| 300 12 |
323.9 12.752 |
300 2.07 |
2-7/8*130 | 380 14.96 |
470 18.504 |
65 2.559 |
Material Specification
Housing: Ductile iron conforming to ASTM A-536, grade 65-45-12.
Housing Coating: Paint red and orange
• Optional: Hot dipped galvanized, electro galvanized.
Gaskets
• EPDM: Temperature range -34ºC to +150ºC. Recommended for hot water service within
the specified temperature range plus a variety of dilute acids,oil-free air and many chemical services.
NOT RECOMMENDED FOR PETROLEUM SERVICES.
• Silicon Rubber: Temperature range -40ºC to +177ºC. Recommended for drinking water,
hot water, high-temperature air and some high-temperature chemicals.
NOT RECOMMENDED FOR PETROLEUM SERVICES.
• Nitrile Rubber: Temperature range -29ºC to +82ºC. Recommended for petroleum products,
air with oil vapors, vegetable and mineral oils within the specified temperature range.
NOT RECOMMENDED FOR HOT WATER
SERVICES OVER +150°F/+66ºC OR FOR HOT
DRY AIR OVER +140°F/+60ºC.
Installation
Certification
Showroom
Application
Package and shipment
Production and quality control
Can Rigid Couplings Accommodate High Torque and High-Speed Applications?
Yes, rigid couplings are well-suited for high torque and high-speed applications. Their design and construction allow them to efficiently transmit large amounts of torque and handle high rotational speeds without compromising performance or introducing backlash.
Rigid couplings are typically made from robust materials, such as steel or aluminum, which provide high strength and stiffness. This allows them to withstand substantial torque loads without deformation or failure. Additionally, rigid couplings do not have flexible elements, such as elastomers or springs, which can be a limiting factor in high-torque applications.
The absence of flexible elements also means that rigid couplings have minimal backlash. Backlash is the clearance between mating teeth in a coupling and can cause position inaccuracies, especially in high-precision systems. Since rigid couplings have a solid, one-piece design, they offer precise and immediate torque transmission, making them suitable for applications requiring high accuracy and repeatability.
Furthermore, the solid construction of rigid couplings allows them to handle high rotational speeds. They do not exhibit the bending or torsional flexibility seen in some other coupling types, which can be limiting factors in high-speed applications. As a result, rigid couplings are commonly used in various high-speed machinery, such as power transmission systems, motors, pumps, and industrial equipment.
However, it is essential to ensure proper alignment and installation when using rigid couplings in high-torque and high-speed applications. Any misalignment between the shafts can lead to increased stresses and premature failure. Regular maintenance, including shaft alignment checks, can help ensure optimal performance and longevity in such demanding applications.
In summary, rigid couplings are an excellent choice for high torque and high-speed applications due to their robust design, minimal backlash, and ability to provide precise torque transmission. When correctly installed and maintained, rigid couplings can reliably handle the demands of various industrial and mechanical systems.
How Does a Rigid Coupling Handle Angular, Parallel, and Axial Misalignment?
Rigid couplings are designed to provide a fixed and rigid connection between two shafts. As such, they do not have any built-in flexibility to accommodate misalignment. Therefore, when using a rigid coupling, it is essential to ensure proper shaft alignment to avoid excessive forces and premature wear on connected equipment.
Angular Misalignment: Angular misalignment occurs when the axes of the two shafts are not collinear and form an angle with each other. Rigid couplings cannot compensate for angular misalignment, and any angular misalignment should be minimized during installation. Precision alignment techniques, such as laser alignment tools, are often used to achieve accurate angular alignment.
Parallel Misalignment: Parallel misalignment, also known as offset misalignment, happens when the axes of the two shafts are parallel but have a lateral displacement from each other. Rigid couplings cannot accommodate parallel misalignment. Therefore, precise alignment is crucial to prevent binding and excessive forces on the shafts and bearings.
Axial Misalignment: Axial misalignment occurs when the two shafts have an axial (longitudinal) displacement from each other. Rigid couplings cannot address axial misalignment. To prevent thrust loads and additional stresses on bearings, it is essential to align the shafts axially during installation.
In summary, rigid couplings are unforgiving to misalignment and require precise alignment during installation. Any misalignment in a rigid coupling can lead to increased wear, premature failure of components, and reduced overall system efficiency. Therefore, it is crucial to use appropriate alignment techniques and tools to ensure optimal performance and longevity of the connected equipment.
Limitations and Disadvantages of Using Rigid Couplings:
Rigid couplings offer several advantages in providing a strong and direct connection between shafts, but they also have certain limitations and disadvantages that should be considered in certain applications:
- No Misalignment Compensation: Rigid couplings are designed to provide a fixed connection with no allowance for misalignment between shafts. As a result, any misalignment, even if slight, can lead to increased stress on connected components and cause premature wear or failure.
- Transmit Shock and Vibration: Rigid couplings do not have any damping or vibration-absorbing properties, which means they can transmit shock and vibration directly from one shaft to another. In high-speed or heavy-duty applications, this can lead to increased wear on bearings and other components.
- No Torque Compensation: Unlike flexible couplings, rigid couplings cannot compensate for torque fluctuations or angular displacement between shafts. This lack of flexibility may not be suitable for systems with varying loads or torque requirements.
- Higher Stress Concentration: Rigid couplings can create higher stress concentration at the points of connection due to their inflexibility. This can be a concern in applications with high torque or when using materials with lower fatigue strength.
- More Challenging Installation: Rigid couplings require precise alignment during installation, which can be more challenging and time-consuming compared to flexible couplings that can tolerate some misalignment.
- Increased Wear: The absence of misalignment compensation and vibration absorption can lead to increased wear on connected components, such as bearings, shafts, and seals.
- Not Suitable for High Misalignment: While some rigid couplings have limited ability to accommodate minor misalignment, they are not suitable for applications with significant misalignment, which could lead to premature failure.
Despite these limitations, rigid couplings are still widely used in many applications where precise alignment and a strong, permanent connection are required. However, in systems with significant misalignment, vibration, or shock loads, flexible couplings may be a more suitable choice to protect the connected components and improve overall system performance and longevity.
editor by CX 2023-12-15