High-Vacuum & High-Pressure Rating PTFE Lined Joint: Universal Pressure-Resistant Bellows for Severe Service Piping
The Ultimate Dual-Capability Barrier for Full-Spectrum Piping Demands.
The High-Vacuum & High-Pressure Rating PTFE Lined Joint is a dual-capability, extreme-service pipeline connector engineered to perform reliably across the entire pressure spectrum. In demanding chemical synthesis, pharmaceutical processing, and high-purity fluid transfer networks, piping systems frequently cycle between heavy positive pressure and intense negative pressure (vacuum). Standard expansion joints often compromise, offering positive pressure containment at the expense of collapsing under vacuum, or resisting vacuum while failing under high working pressures.
This severe-service bellows solves this challenge by integrating a high-density, non-porous PTFE (Polytetrafluoroethylene) liner into a multi-ply, fabric-reinforced elastomeric shell embedded with continuous internal steel ring reinforcements. The virgin PTFE inner core creates an impenetrable chemical shield against aggressive acids, strong oxidizers, and volatile solvents, while the heavy-duty composite housing prevents both internal vacuum collapse and outward radial expansion. Fitted with precision-machined backing flanges, this universal connector effectively dampens pump vibrations, relieves complex dynamic thermal stress, and guarantees zero-leakage performance under extreme operational conditions.
Performance characteristics
Full-Spectrum Pressure Resistance: Specially constructed to operate continuously across extreme pressure ranges—from full vacuum (negative pressure) up to high positive working pressures—without liner collapse or radial ballooning.
Severe-Service Chemical Immunity: The high-density fluoropolymer liner is completely non-reactive, isolating the outer structural body from concentrated nitric, sulfuric, and hydrochloric acids, as well as aggressive solvents and toxic fluids.
Anti-Collapse Structural Design: Engineered with integrated internal metallic support rings locked within the bellows architecture during vulcanization, keeping the PTFE liner firmly anchored against the outer wall under deep vacuum or pump suction.
Omni-Directional Movement Relief: The flexible single-sphere arch geometry yields smoothly to dynamic system stress, simultaneously absorbing axial compression, axial extension, lateral shear, and angular piping misalignments.
Integrated Flared Full-Face Seal: The internal PTFE liner extends completely through the throat and wraps over the face of the metallic backing flanges, functioning as an integrated, full-coverage chemical gasket that guarantees a leak-proof seal at connection points.
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° |
|
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
|
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
|
|
4.Vulcanizing
Automatic vulcanization machine ensure vulcanization time and pressure
|
5.Inspecting
100% strict inspection is to be responsible for consumers
|
6. Packaging
Protective Packaging for No
Rust and Breakage
|
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 makes this PTFE-lined joint "universal" compared to standard lined joints?
Standard PTFE-lined joints are typically optimized for either positive pressure or mild vacuum service. This universal joint is engineered with a high-strength composite rubber shell and integrated vacuum restraint rings, allowing it to withstand high positive working pressures and full negative pressure (deep vacuum) within a single component, without needing separate designs for different process phases.
Q2: How does the joint handle negative pressure without the PTFE liner pulling away or collapsing?
During manufacturing, high-strength internal vacuum support rings are precisely embedded and locked into the bellows construction. These rings act as a structural skeletal frame that mechanically holds the PTFE liner flush against the reinforced rubber housing, preventing suction forces from pulling the liner inward into the flow stream.
Q3: Do I need to install separate gaskets when bolting this expansion joint into my pipeline?
No separate gaskets are required. The internal PTFE lining is flared and turned over the entire sealing face of the backing flanges during processing. This continuous, smooth fluoropolymer surface acts as its own high-quality full-face gasket, forming an immediate, leak-proof chemical seal when bolted to mating pipe flanges.
Q4: Can this joint handle severe thermal expansion in high-temperature chemical lines?
Yes. Continuous fluid process lines generate significant thermal growth and piping stress. The flexible elastomeric body and high-density PTFE lining are built to accommodate continuous thermal cycling up to 115°C, absorbing axial, lateral, and angular shifts to protect connected pumps, valves, and rigid anchors.
Q5: Why are control units (limit rods) recommended for severe service applications?
When handling hazardous chemicals under extreme pressure or vacuum conditions, unexpected line surges or unanchored pipe movement can stretch the bellows beyond its engineered movement thresholds. Heavy-duty steel control units (tie rods) act as a physical safety stop to prevent over-extension or over-compression, ensuring total system containment and mechanical safety.
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