Heavy-Duty Expansion Joint with Certified Pressure Rating: Non-Deforming PTFE Lined Flange Connector for Hazardous Fluids
Heavy-Duty Expansion Joint with Certified Pressure Rating: Non-Deforming PTFE Lined Flange Connector for Hazardous Fluids
Certified Zero-Deformation Pressure Containment for High-Risk Hazardous Fluid Lines.
The Heavy-Duty Expansion Joint with Certified Pressure Rating is an advanced engineering solution built for processing networks handling volatile, toxic, and highly aggressive industrial media under pressure. When conveying dangerous chemicals, standard unreinforced fluoropolymer or flexible connectors can suffer from structural creep, wall thinning, and radial deformation over prolonged pressure cycles—creating critical leak hazards.
This heavy-duty flanged connector solves structural instability by fusing a certified, high-density PTFE (Polytetrafluoroethylene) liner directly within a reinforced, high-strength elastomeric composite body. The precision-molded PTFE liner provides absolute chemical immunity while retaining its non-deforming profile under rated operating pressures. Outfitted with heavy-duty backing flanges and built to strict pressure certification standards, this flexible connector swallows high-frequency pump vibrations, neutralizes dynamic thermal expansion stress, and maintains total zero-leakage security across severe-service hazardous piping systems.
Performance characteristics
Non-Deforming Structural Integrity: Engineered with a specialized high-density PTFE lining and embedded internal reinforcement layers that prevent radial ballooning, wall collapse, and structural creep under continuous working pressure.
Third-Party Certified Pressure Rating: Rigorously pressure-tested and certified to meet defined working pressure limits, providing documented safety margins for hazardous and high-risk fluid conveyance.
Universal Chemical Resistance: The virgin PTFE inner liner is completely non-reactive, isolating the outer structural body from concentrated acids, strong alkalis, toxic organic solvents, and corrosive process fluids.
High-Efficiency Kinetic Shock Isolation: The elastomeric outer shell acts as an efficient vibration isolator, dampening mechanical noise, hydraulic surges, and motor hum right at the pump or valve interface.
Integrated Flared Full-Face Seal: The continuous PTFE liner extends through the throat and flares across the entire flange sealing face, functioning as an integrated, chemical-proof gasket that prevents joint seepage and flange face corrosion.
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 causes standard PTFE-lined joints to deform under pressure, and how does this joint prevent it?
Under continuous pressure and elevated temperatures, unreinforced PTFE can undergo "cold flow" or mechanical creep, causing the liner to stretch, thin out, or deform radially. This heavy-duty joint prevents deformation by bonding the high-density PTFE liner within a multi-ply, fabric-reinforced rubber matrix supported by internal metal restraint rings, preserving the liner's exact internal geometry under load.
Q2: Why is a "Certified Pressure Rating" critical for hazardous fluid piping?
Hazardous, toxic, or volatile fluids leave zero margin for structural failure. A certified pressure rating provides documented proof that the expansion joint has undergone hydrostatic burst and pressure-cycling verification, ensuring it reliably handles system working pressures and unexpected pressure spikes without leaking or rupturing.
Q3: Are separate full-face gaskets required when bolting this flanged connector to piping?
No separate gaskets are needed. The internal PTFE liner extends through the throat and wraps completely over the raised face of the metallic backing flanges. This turned-over PTFE boundary acts as its own full-coverage, chemical-proof gasket, forming an immediate, leak-proof seal when torqued against mating pipe flanges.
Q4: Can this non-deforming joint handle full vacuum or negative pressure conditions?
Yes. Because hazardous lines often experience sudden vacuum drops or suction forces, an optional internal vacuum support ring can be integrated into the construction during manufacturing. This mechanical ring locks the non-deforming PTFE liner securely against the outer wall, preventing liner collapse under vacuum.
Q5: How do control units (tie/limit rods) enhance safety when using this joint for hazardous media?
Control units act as a mechanical safety boundary for unanchored pipelines. If a pressure surge occurs or a pipe anchor settles unexpectedly, the heavy-duty steel limit rods physically limit axial extension and compression, preventing the flexible bellows from over-stretching and causing catastrophic joint separation.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.