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Why does leakage occur at the end face of a rubber expansion joint?
Rubber expansion joints play a crucial role in pipeline systems. However, end - face leakage occasionally occurs. The main reasons are as follows: Improper Installation Bolts Not Tightened Properly or Uneven Force Application: During installation, if the bolts are not tightened or are tightened with inconsistent forces, the sealing surface of the rubber joint cannot fit perfectly, creating leakage paths. Unclean Sealing Surface: The presence of impurities, oil stains, etc., on the sealing...
The installation of a negative pressure ring on a rubber flexible joint is typically required in pipeline systems where negative pressure conditions may occur. Negative pressure refers to a state where the internal air pressure within the pipeline drops sharply due to certain factors, creating a suction effect. If the rubber soft joint cannot withstand such negative pressure, it may collapse or get distorted, thereby disrupting the normal operation of the pipeline. Specifically, here are some...
What are the common models and specifications of flange flexible connectors?
There is a wide variety of common models and specifications for flange flexible connectors, which are suitable for different pipeline connection scenarios. Below are some common models and specifications of flange flexible connectors: 1.304 Stainless Steel Flange Rubber Expansion Joints: Common specifications: DN65, DN80, DN100, DN150, DN200, DN300 Parameters: Length 115mm, axial compression 12mm, axial extension 6mm, lateral displacement 10mm. 2.Flat Flange Flexible Connectors: Side length...
Where is flange adapter primarily used?
A flange adapter is a connector used to join two different types of flanges that cannot be directly mated together. It comes in various sizes and is made from different materials, such as steel, PVC, and brass. This type of adapter is highly useful in piping engineering, HVAC systems, as well as water supply and drainage systems, especially when connecting flanges made of different materials. The working principle of a flange adaptor is based on its design, which allows flanges of different...
Why is NBR commonly used as the material for oil-resistant rubber flexible joints?
It is indeed true that NBR is commonly used as the material for oil-resistant rubber expansion joints. This is because NBR possesses excellent oil resistance, particularly against mineral oils, liquid fuels, solvents, and animal and vegetable oils. Its oil resistance surpasses that of natural rubber, neoprene, and styrene-butadiene rubber (SBR), making it highly suitable for manufacturing oil-resistant rubber flexible joint. NBR is a synthetic rubber copolymerized from butadiene and...
What is a duct rubber expansion joint?
A duct rubber soft joint is a device used for flexible connection between various fans and air ducts. It is composed of rubber, rubber-fiber composite materials, steel flanges, sleeves, and thermal insulation materials. Its functions include vibration damping, noise reduction, sealing, medium resistance, ease of displacement, and convenient installation. It is an extremely ideal accessory for vibration damping, noise reduction, smoke elimination, and dust removal in the field of environmental...
When a duckbill valve is jammed by foreign matter, the following steps should be taken.
When a duckbill check valve gets stuck due to foreign objects, the following steps can be taken for handling: Assess the situation: First, determine the size, shape, and the extent to which the foreign object is stuck. This will dictate the subsequent handling method. Close the valve: For safe operation, close the duck bill valve and shut off the medium flow to prevent accidents during the handling process. Attempt manual removal: If the foreign object is small, try to gently remove it using...
Why does the bellow expansion joint experience pull-off phenomenon?
The reasons for the pull-off phenomenon of bellows type expansion joint mainly include the following aspects: Improper arrangement of fixed supports: During installation and use, if fixed supports are not installed, or if they are pulled apart, or if their load-bearing capacity is insufficient, excessive deformation of the compensator may occur under pressure, ultimately leading to the pull-off phenomenon. Inadequate adjustment of pull rod devices: After installation, the pull rod devices that...
Installation steps of dismantling joint
The installation steps of flange dismantling joint typically include the following key stages: 1.Preparation: Check the model and specifications of the self restrained dismantling joint and its accessories to ensure they meet the design requirements. Clean the surfaces of the flange joints and force transmission components to ensure they are free of dust, oil, or other impurities. 2.Installation of support (if applicable): Determine the correct position and height of the support based on the...
Under what circumstances will rubber flexible joint experience leakage?
Corrosion-resistant rubber expansion joints may experience leakage under the following circumstances: Improper installation: If the tightening sequence or force is uneven during the installation of the rubber expansion joint flanges, it may lead to poor sealing and subsequent leakage. Damage to the sphere (body): If the surface of the rubber flexible joint sphere has damage, such as punctures from sharp objects or cracks caused by aging, it may also result in leakage. Air pore leakage on the...
The main reasons for the damage of bellow expansion joints are corrosion and water hammer.
The primary causes of damage to expansion bellows include corrosion and water hammer. According to multiple pieces of evidence, corrosion and water hammer are two major factors leading to the damage of bellows compensators. Corrosion is one of the significant reasons for the damage to bellow exansion joint. It can be caused by various factors, including internal media and external environmental conditions. For instance, when the internal media does not meet standard requirements, corrosive...
How should Non-Metal Expansion Joints be stored?
Non-metal expansion joints should follow the requirements below during storage to ensure their performance and service life: 1.Clean Storage: Ensure that the surface of the farbic expansion joint is free from dust, dirt, and other debris before storage to prevent any impact on its performance and lifespan. 2.Avoid Extreme Environments: Do not store fiber compensators in environments with excessively high or low temperatures, as this may cause material aging, hardening, or...
Water Line Related to types of flanges
I.Definition of Pipe Flange Water Line The term "water line of a flange" refers to the sealing path located at the flange connection. In flange connections, sealing gaskets or packing materials are used to ensure leak-tightness at the joint, while bolts are employed to tightly fasten the two flanges together. The position where these gaskets or packing materials are installed constitutes the water line of the flange. II. Functions of Flange Water Line 1.Leakage PreventionThe primary role of the...
The threaded union rubber expansion joint, also known as the threaded flexible connection or threaded rubber flexible connection, is a type of pipeline joint with high elasticity, high air tightness, medium resistance, and climate resistance. It utilizes the advantages of rubber's elasticity, high air tightness, medium resistance, weather resistance, and radiation resistance. It is compounded with high-strength, cold and heat-stable polyester cord fabric and vulcanized through high-pressure and...
Specific functions of flange type bellows expansion joints during installation and operation
A flange type bellow expansion joint is a compensation component commonly used in piping systems. It achieves the following key functions through the effective expansion and contraction deformation of its main working body, the bellows: 1.Absorption of Thermal Expansion and Contraction: The flange bellows expansion joint can compensate for changes in pipe dimensions caused by temperature variations, i.e., thermal expansion and contraction, thereby reducing stress concentrations and potential...
How much do you know about the installation precautions for flexible metal hoses?
Stainless Steel Flexible HoseStainless steel flexible hose is devices used for protecting wires, cables, and automation instrumentation signals, as well as for civil shower hoses. Their sizes range from 3mm to 150mm in diameter. Key features of these hoses include their ability to withstand certain pressures and the option to customize the number of stainless steel wire or steel strip layers based on specific application scenarios. The general pressure range of stainless steel flexible hoses is...
Reasons for Leakage in Threaded Rubber Expansion Joint
thread union rubber expansion joint is prone to leakage in the following situations: 1.Improper Installation: If during installation, the neck of the joint's spherical body is not fully seated in the flange groove, or if installation screws are over-tightened causing damage to the rubber sealing surface, leakage may occur. 2.Flange Compatibility Issues: Using flanges that do not match the threaded flexible connection specifications (e.g., oversized flanges) may damage the sealing surface during...
How to select the appropriate flange adapter？
Flange adaptor is primarily used to connect two different types of flanges when they cannot be directly mated together. They enable the connection of flanges with different specifications or types to establish an interface between pipes or equipment. For instance, they can be used to connect PVC flanges with other materials such as steel, copper, and cast iron; steel flanges with other materials like PVC, brass, and copper; and cast iron flanges with other materials. Additionally, they are...
Summary of the Steps and Methods for Repairing Corrugated Compensator
The steps and methods for repairing a bellows expansion joint can be summarized as follows: 1.Disassembly and Cleaning: First, the expansion bellow compensator needs to be disassembled from the system. Clean its inner walls and bellows thoroughly to ensure no contamination during subsequent processing. 2.Inspection and Detection: Check the bellows for cracks, deformations, and other issues. If problems are found, replacement is necessary. For non-ferromagnetic materials (e.g., stainless steel...
Can bellow expansion joint and metal hose replace each other?
In gas pipeline design, two common types of expansion bellows are used to eliminate both internal pipeline stress and external imposed forces: Bellow expansion joints:Bellows primarily eliminate longitudinal stress. For example, in high-rise building designs, it is advisable to install bellows before the ball valve on the inlet pipe (along the gas flow direction). This mainly serves to prevent damage to the pipe caused by building settlement. For buried pipelines, bellows type expansion joint...
Differences in ANSI Flanges Across Different Pressure Ratings
ANSI Flanges: Design Variations Across Pressure Ratings ANSI flange is a component used to connect pipelines, valves, equipment, etc., secured via bolted joints to ensure system sealing and structural integrity. Flange design and application must comply with specific standards and codes to guarantee safety and reliability under varying operating conditions. For flanges of the same nominal diameter, design and construction differ across pressure ratings, primarily manifested in the following...
How to Protect the PTFE Lining During Installation of PTFE Lined Bellows Expansion Joints?
Precautions for Protecting PTFE Linings During Installation of PTFE Lined Bellows Expansion Joints: 1.Avoid Impacts and ScratchesDuring transportation and installation, exercise extreme caution to prevent impacts or scratches to the expansion joint. PTFE lined bellow expansion joint is typically fabricated by pressing thin-walled stainless steel plates, so avoid sparks generated during welding processes from contacting the unit to prevent damage. 2.Prevent Foreign Object IngressBefore...
Detailed Introduction to Flange type bellow expansion joint for valves
Working Principle and Detailed Introduction of Flange Type Bellow Expansion Joint for Valves The operating mechanism of flange bellows expansion joint for valves primarily relies on their flexible structure to compensate for dimensional changes or displacements in pipelines caused by temperature variations, mechanical vibrations, or other factors. Below is a specific breakdown of their functions: 1. Compensation for Thermal Expansion When the temperature of the pipeline medium or ambient...
Procedures for Properly Measuring the Dimensions of Non-Metallic Expansion Joints
To properly measure the dimensions of non-metallic expansion joints, use appropriate measuring tools and follow these steps: Measurement Preparation Confirm Measuring Tools: Prepare tools with suitable precision, such as vernier calipers, tape measures, rulers, etc. Inspect Expansion Joint Condition: Ensure the non-metallic expansion joint farbic is in a natural state (free from external tension, compression, or deformation) and that its surface is clean and undamaged. Dimension...
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.