Zero-Permeation PTFE Lined Flanged Expansion Joint: Shock-Absorbing Rubber Bellows for Concentrated Acid Lines
Zero-Permeation PTFE Lined Flanged Expansion Joint: Shock-Absorbing Rubber Bellows for Concentrated Acid Lines
Product Description
The Zero-Permeation PTFE Lined Flanged Expansion Joint stands as an elite security component engineered specifically for the extreme demands of concentrated acid lines and hazardous chemical processing networks. Transporting highly volatile fluids like concentrated sulfuric, hydrochloric, or nitric acids requires a system that eliminates all risk of chemical weeping, environmental contamination, or joint failure. This heavy-duty flanged expansion joint achieves maximum safety by fusing an ultra-high-density, zero-permeation PTFE (Polytetrafluoroethylene) liner directly within a multi-layered, reinforced rubber bellows.
The seamless interior PTFE barrier completely isolates the structural elastomer and high-tensile fabric matrix from the chemical stream, preventing micro-permeation, material blistering, and chemical degradation. Combined with robust, free-rotating backing flanges that ensure a secure, uniform bolt load, this shock-absorbing rubber bellows neutralizes intense hydraulic pulsations, accommodates significant thermal movement, and dampens mechanical pump vibrations, keeping your high-risk chemical piping infrastructure secure, leak-free, and operational.
Performance characteristics
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Zero-Permeation Barrier: Fabricated using a high-density, specialized molecular structure of pure PTFE that effectively prevents micro-porosity and gas/liquid permeation, even when handling highly concentrated, aggressive acids.
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Total Chemical Resistance: The structural inner liner remains completely inert and unaffected when exposed to the most destructive chemicals, strong oxidizers, volatile solvents, and reactive inorganic acids across its entire operational spectrum.
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Premium Kinetic Shock Absorption: The heavy-duty elastomer exterior housing acts as a highly efficient vibration isolator, absorbing solid-borne noise, high-frequency motor hums, and sudden pressure surges from chemical transfer pumps.
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Multi-Axial Displacement Relief: The flexible single-sphere bellows configuration yields smoothly to dynamic pipeline stress, simultaneously compensating for axial compression, axial extension, lateral shear, and angular piping misalignments.
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Flared Full-Face Integrity: The internal PTFE liner extends completely through the throat and flares outward across the entire flange sealing face, creating an integrated, chemical-proof gasket surface that completely seals out moisture and corrosive fumes at the joint interface.
Product Specification
| Size | Length | Allowable Movements in Operation | ||||
| mm | inch | mm | Axial Compression mm | Axial Extension mm |
Transverse Movement mm |
Angular Deflection mm |
| 25 | 1 | 130/152 | 20 | 12 | 14 | 15° |
| 32 | 1 1/4 | 95/130/152 | 20 | 12 | 14 | 15° |
| 40 | 1 1/2 | 95/130/152 | 20 | 12 | 14 | 15° |
| 50 | 2 | 105/130/152 | 20 | 12 | 14 | 15° |
| 65 | 2 1/2 | 115/130/152 | 20 | 12 | 14 | 15° |
| 80 | 3 | 130/135/152 | 20 | 12 | 14 | 15° |
| 100 | 4 | 130/152 | 20 | 12 | 14 | 15° |
| 125 | 5 | 130/152/165 | 20 | 12 | 14 | 15° |
| 150 | 6 | 130/152/185 | 20 | 12 | 14 | 15° |
| 200 | 8 | 130/152/210 | 20 | 12 | 14 | 15° |
| 250 | 10 | 130/203/230 | 20 | 12 | 14 | 15° |
| 300 | 12 | 130/203/245 | 25 | 16 | 22 | 15° |
| 350 | 14 | 200/255 | 25 | 16 | 22 | 15° |
| 400 | 16 | 200/255 | 25 | 16 | 22 | 15° |
| 450 | 18 | 200/255 | 25 | 16 | 22 | 15° |
| 500 | 20 | 200/255 | 25 | 16 | 22 | 15° |
| 600 | 24 | 260 | 25 | 16 | 22 | 15° |
| 700 | 28 | 260 | 25 | 16 | 22 | 15° |
| 800 | 32 | 260 | 25 | 16 | 22 | 15° |
| 900 | 36 | 260 | 25 | 16 | 22 | 15° |
| 1000 | 40 | 260/300 | 25 | 16 | 24 | 15° |
| 1100 | 44 | 300 | 25 | 16 | 24 | 15° |
| 1200 | 48 | 300 | 25 | 16 | 24 | 15° |
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Note: If the medium is oil, acidic or alkaline substances, and there are special requirements for the working temperature, you can customize it by sending a letter or drawing. Please specify when ordering |
Product Details
Production Flow
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1.Raw material Top level CR/EPDM/NBR rubber raw materials, No recycled rubber |
2.Plasticating and mixing Special Formulation for better Bending with Nylon,For Better Strength,Sealing |
3.Workblanks wraping Cooper plated steel wire reinforcement prevent pull off |
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4.Vulcanizing Automatic vulcanization machine ensure vulcanization time and pressure |
5.Inspecting |
6. Packaging |
Application
Rubber Expansion Joint Standard are widely used in various fields, including construction, chemical industry, shipbuilding, tap water, gas, chemical pipelines, petroleum pipelines, food pipelines, air conditioning pipelines, and sewage treatment.
Our Services
1.24-hour online
2.Free samples provided
3.Support customization
4.Provide drawings
5.Multiple payment styles to choose from
6.Factory inspection (material, specifications, quantity, pressure, packaging)
7.Long warranty period
8.Suitable packaging for transportation
Our Customer
Certificate
FAQ
Q1: What does "Zero-Permeation" mean for this specific expansion joint?
In high-concentration chemical systems, standard plastic liners can sometimes allow microscopic amounts of aggressive gases or fluids to seep through their molecular gaps over time—a process called permeation. Our zero-permeation PTFE lining undergoes a specialized high-density manufacturing process that eliminates these microscopic voids, ensuring that even volatile concentrated acids cannot pass through to attack the outer rubber casing.
Q2: Why is a PTFE-lined rubber joint preferred over an unlined exotic alloy metal expansion joint for acid lines?
While exotic alloys can resist corrosion, they are highly rigid, susceptible to fatigue cracking from continuous vibration, and significantly more expensive. A PTFE-lined rubber joint provides the absolute chemical defense of a fluoropolymer combined with the superior vibration damping, shock absorption, and high-flexibility traits of a heavy-duty elastomer.
Q3: Does the flared PTFE flange face require any special handling during installation?
Yes, because the turned-over PTFE face acts as the built-in, full-surface gasket, ensure that the mating pipeline flanges are entirely clean, flat, and free of sharp burrs before installation. Tighten the backing flange bolts in a progressive, star-pattern sequence using a torque wrench to achieve an even seal without over-compressing the liner.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.