DUCTILE IRON COUPLINGS
Pipe coupling is a joint which can connect two plain ends of pipes together. Pipe coupling can be PVC, steel, brass, ductile iron etc material.
Juberd is a ductile iron coupling manufacturer in China with over 30 years of experience.
Judberd couplings family include dedicated pipe coupling, maxi fit coupling(also called universal coupling or wide range coupling) ,dress coupling ,flange coupling ,flange adaptor coupling ,step coupling ,restrained coupling for HDPE Pipe, multi grip restrained couplings etc as below.
Ductile Iron Coupling types
We also can design as per client requirement
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Why judberd coupling?
We have a professional design team with 30 years of work experience, which ensures that our pipe couplings not only work well but also have advantages such as easy installation, long lifespan, and competitive pricing.
Judberd offers over 20 different designs of pipe couplings to choose from, and we can also design and produce according to customer requirements.
Producing castings using automated production lines results in high quality, low prices, and high efficiency.
Judberd strictly controls the quality of each component, ensuring that every detail maintains good quality.
How to produce coupling?
As a professional coupling Couplings with different designs have different production processes. Take ductile iron coupling as an example
1. Cast test rods and test blocks, and test the chemical composition and mechanical properties of the test rods and test blocks, so as to confirm that the chemical composition, mechanical properties and nodularization rate of the ductile iron meet the requirements
2. Shape
3. Casting
4. Polising and Coarse shot blasting
5,Machining if it is needed and fine shot blasting
6. FBE coating,Nylon11 coating etc
7. Assembling
8,Testing,Please note that after each step is completed, corresponding inspections must be carried out to determine whether the product can enter the next process.
Pipe coupling material
Ductile iron ,steel or ductile iron end ring and steel middle sleeve
Normally for low pressure which is less than PN40, we suggest use ductile iron material pipe coupling ,but for higher pressure which is equal to or more than PN40, we suggest use steel material pipe coupling because ductile iron coupling can’t afford these high pressure
Pipe coupling length
Pipe coupling length is up to client requirements ,shorter or longer is ok
What pipe can pipe coupling used for?
Judberd can offer various pipe couplings to connect ductile iron ,steel,PVC,PE ,AC,GRP etc pipe,clients need to tell us what is the pipe material and pipe OD to choose the right pipe couplings for you.
How to install pipe coupling?
- Inspect all components of the pipe coupling to ensure the quality of each part is intact.
- Insert the two pipes to be connected into the pipe coupling from both ends. Although each end of the pipe can have a maximum deflection of 6 degrees, during connection, strive to make the two pipes concentric and parallel.
- Pay attention to the gaps required inside the pipe coupling for the two pipes, as specified in judberd’s datasheet. It is prohibited for the two pipes to touch each other to prevent damage when the pipes move.
- Following the sequence shown in the left diagram 1, tighten each nut 1-2 turns diagonally, ensuring that each bolt is tightened to the specified torque with even force.
- The sealing ring should undergo sufficient deformation to fill all gaps between the pipe coupling and the pipes, and it should withstand the outward pressure generated by the internal fluid.
- During the pressure test in the pipeline trial run, if there is any leakage, follow the steps above to further tighten the bolts until no water leaks out.
What is max. angular deflection of pipe couplings?
When we use pipe coupling to connect pipes, the maximum allowable deflection angle of the pipe is determined by the distance “L” between the pipe coupling central sleeve and the outer diameter of the pipe, as shown in the diagram on the right. The larger the value of “L,” the greater the permissible deflection angle of the pipe. Additionally, the thickness of the sealing gasket should be larger. If it’s a restrained type coupling, then the maximum deflection angle of the pipe is also influenced by the locking ring or block. You can tighten or loosen the locking ring or block to adjust the maximum deflection angle of the pipe. If customers have specific requirements for the maximum deflection angle of the pipe, they can contact Judberd for special design to meet the needs of the engineering project.
Flange Coupling Adaptor: Working Principle and Applications
what is pipe coupling ?
A pipe coupling is a very common connection between the spigot ends of two pipes. It can be used to connect pipes with the same outer diameter or pipes with different outer diameters. It can be used to connect very strong pipes such as carbon steel, ductile iron and AC pipes, or plastic pipes such as PVC and PE.
Pipe coupling is generally made up of 4 parts, the gland, the middle sleeve, the rubber ring and the bolt. When we insert the pipe into the gland and the middle sleeve, we can tighten the bolt and squeeze the gland through the bolt, thus exerting pressure on the rubber ring to deform the rubber ring, thus forming a seal between the pipe and the gasket. This prevents water leakage. For flexible deformations and dislodgements such as PE pipes, judberd has specially designed couplings with a copper ring which we use together with the rubber ring to grip the pipe and prevent it from dislodging. Some customers also choose a coupling without a copper ring but with a particularly long middle sleeve, which also effectively prevents the PE pipe from coming out.
The Applications of Coupling
Pipe coupling is a very common connection in industry. It has the advantages of simple installation,good sealing performance and convenient disassembly. It is widely used in water supply and drainage, petroleum, chemical industry, food, beverage, shipbuilding, medicine and other industries.There are many types of pipe couplings, such as:univesal coupling,dresser coupling,flexible coupling,restrained coupling etc.
What is dresser coupling?
The dresser coupling is the best design for connecting tubes, allowing for slight misalignment, vibrations, expansion and contraction, but not for axial displacement. The length of the tube inserted into the dresser coupling is determined by the length of the middle barrel of the dresser coupling and a gap is left between the two tubes to prevent them from touching each other during slight misalignment or vibration.
The judberd dresser coupling is designed to reach 330 psi. judberd’s dresser coupling consists of a ductile iron middle sleeve, a gland at each end, a rubber ring between the gland and the middle sleeve and a bolt that runs across the entire length of the dresser coupling. The grade of ductile iron can be changed according to the customer’s requirements. ENGJS450-10, ENGJS500-7, EN GJS400-18 according to EN1563, ASTM65-45-12 are the most commonly used. Other materials, such as ductile iron with high elongation for low temperature resistance, can also be produced according to customer requirements. Rings can be made of EPDM, NBR, SBR or special materials according to the customer’s requirements. The bolts can be made of carbon steel grade 4.8, 6.8, 8.8, 10.8 or stainless steel (surface coated with teflon), and can be fitted to the pipe by tightening the diagonal bolts in sequence with a spanner to the required torque. Please note that the coupling does not support the pipe, so make sure the ground is level , for some special pipes such as HDPE pipes that are easily dislodged or where there is a large vibration in the ground, we need to install a restrained type. Do not over-tighten the bolts, as excessive torque can cause extreme stress on the coupling. If required, please contact judberd for installation instructions.
How to choose satisfied manufacturer for flange adapter coupling?
Maybe the products looks very similar,but the products quality details are very different as below
1,The gasket quality,the gasket is most import parts for flange coupling adaptors,the EPDM/NBR/SBR ‘s Chemical composition affects the quality of the gasket.So one certificate for gasket is very important to know the gasket’s material.Good gasket material can assure long warranty period.
2,The material for body,chemical composition and mechanical properties are the very import indicator to measure whether the composition of ductile iron is qualified to standard
3, adhesion and thickness of the powder. Poor adhesion of the powder is a common quality problem for suppliers, so be sure to conduct an impact test before shipping to ensure that the powder does not come off. Another is the thickness of the powder, many suppliers in order to reduce the cost of using the powder, so the thickness does not meet the EN14901-1 standard. Therefore, the thickness of the powder must be tested before delivery to ensure that the average thickness is not less than 250um and the minimum thickness is not less than 200um.
4, the bolt quality inspection, first of all, to see whether the bolt grade has reached ISO898-1 standard, in addition to the strength grade of the bolt, we also want to test the thickness of the bolt’s anti-rust coating, such as Dacromet can be plated a layer can also be plated two layers, the price and the time of anti-rust is very different.
In addition, the bolts also need to be tested for torque and tension.
5,The inner wall of the pipe coupling is smooth, and there are no burrs or dead corners inside. The surface of pipe coupling is bright and clean wout any sand hole or crack,no surface defects such as uneven color and spots.
Pipe coupling types
1,Universal coupling(also called maxifit coupling,wide range coupling,supa coupling )
2,Dedicated coupling
3,Restrained coupling
4,Multigrip restrained coupling
5,Step coupling
Mechanical coupling joint restraint couplings
What is mechanical coupling joint restraint couplings?
There are many benefits to using restrained joint couplings, especially for HDPE pipes. Not only do they provide an additional level of security against leaks, but they also allow for a more secure connection overall. In addition, restrained joint couplings are less likely to come apart than other types of connections, making them ideal for use in areas where there is a high risk of displacement or where the pipes are particularly vulnerable to deformation.
Mechnical joint pipe coupling has an additional mechanical joint (also called restrained joint) compared to a normal pipe coupling to catch the pipe and prevent it from deflecting or coming out and causing leak.This mechnial joint or restrained joint can be designed by manufacturer.Judberd have designed mechnical joint (also called restrained joint) for PE pipe,we added gripper which consists of galvanised cast iron Tightening blocks and carbon steel grade 4.8 bolts.Once we have installed the pipe, we tighten the bolts so that the pipe can be gripped with the tightening block.
Maxifit pipe couplings
Maxifit pipe coupling types ?
The advantage and disavantage of maxifit coupling VS dedicated coupling?
The maxifit coupling is also available in several designs, material can be in ductile iron, carbon steel, or ductile iron gland carbon steel middle sleeve, and the range can be designed according to the customer’s requirements. The advantage of a large range is that as many pipes as possible can be connected by the same coupling. This keeps the number of maxifit coupling in stock to a minimum. However, a maxifit coupling with a large range requires a large deformation of the rubber ring when connecting small pipe outside diameter, which means that more torque and more time is required for installation. Dedicated couplings or couplings with a small range , on the other hand, require a higher stock to meet the requirements of connecting different pipes, but require less torque and time to install. So there are advantages and disadvantages to maxifit coupling and dedicated coupling and the user can choose according to the actual situation.
