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Gansu Juxiang Fluoroplastics Technology Co.,Ltd. manufactures the JXF7021 Wavy Active Compression Gasket for flange joints that must hold tight under combined mechanical load, thermal movement and aggressive media. The gasket combines a metal core with non-metallic sealing layers and is pressed into a wavy profile with concentric circular grooves on the upper and lower faces that are offset from one another. The result is a metal-backed gasket with controlled elastic recovery: it keeps sealing pressure on the joint while the flange and bolt assembly work under low load.
As a Wavy Active Compression Gasket manufacturer, we produce the JXF7021 at our Yumen, Gansu production base in China and support it with material selection, drawing review and custom manufacturing. The gasket is part of a wider sealing range that includes modified PTFE gaskets, expanded PTFE reinforced flange gaskets and large molded PTFE sealing frames, so the joint can be matched to the medium, flange condition and available bolt load rather than forced into a single construction.
A Metal-Core Gasket Built for Severe Flange Duty
The wavy active compression design is aimed at joints where a conventional soft gasket would creep, relax or extrude. The metal core gives the gasket rigidity and a compression stop; the offset wavy grooves create several sealing lines across the sealing face. That combination lets the gasket follow small flange movements without losing contact stress.
- Multi-channel labyrinth seal: offset concentric grooves interrupt leakage paths and resist plastic flow of the non-metallic sealing layer.
- Low bolt load: the elastic wavy profile develops sealing stress with less bolt preload, which suits flanges and valve body cavities with limited tightening capacity.
- Compression control: the metal core limits excessive compression and helps prevent blowout and cold flow.
- Thermal cycling: the active wave responds to differential expansion between flange, bolt and gasket.
- Low-emission performance: the JXF7021 has passed the VDI 2440 low-emission test.
- Severe service fit: high temperature, high pressure, ultra-low temperature, strong corrosion and thermal shock.
Low-pressure valve middle cavity sealing is a natural application. The gasket maintains a sealing line where the cavity pressure is modest but the available bolt load and compression space are tightly controlled. The same construction is used on pipe flanges, heat-exchanger connections and vessel openings where thermal cycling or corrosive media would shorten the life of a plain soft gasket.
Our Sealing Range and Where the Wavy Gasket Fits
The wavy active compression gasket is the metal-core option in our sealing portfolio. The other product families cover different flange conditions and media, and we select between them on the working point rather than on gasket thickness alone.
| Product family | Construction | Where it fits | Configuration focus |
|---|---|---|---|
| Wavy Active Compression Gasket (JXF7021) | Metal core with non-metallic sealing layers, offset wavy concentric grooves | High-temperature, high-pressure, cryogenic, corrosive and thermal-cycling flange joints; low-pressure valve middle cavity | Core grade, sealing layer material, wave geometry, thickness, bore and bolt circle |
| Modified PTFE Gasket | Modified PTFE sheet cut or machined to flange dimensions | Chemical, petrochemical and general industrial flanges requiring broad chemical resistance | Sheet grade, thickness, inside and outside diameter, bolt holes, surface finish |
| Expanded PTFE Reinforced Flange Gasket | Expanded PTFE with reinforcement | Steel, glass-lined and irregular mating surfaces where conformability and strength are both needed | Reinforcement type, density, thickness, cut profile |
| Large Integrated Molded PTFE Sealing Frame and Gasket | Molded PTFE sealing frame and gasket | Large vessel, tower and equipment openings with integrated sealing geometry | Molded shape, joint detail, handling provisions |
| Filled PTFE Product | PTFE compounded with fillers | Sealing and wear parts where virgin PTFE lacks compression resistance or dimensional stability | Filler system, compression, machining allowance |
For a wavy gasket, the sealing layer is selected for the medium and temperature, while the core and wave profile are set by the flange rating, bolt load and compression space. We review those inputs together because a change in facing material or wave depth alters the joint behaviour.
Configuration and Critical Specifications
Each JXF7021 is configured around the working point. The gasket drawing fixes the bore, outside diameter, bolt circle, thickness and wave geometry; the material specification fixes the metal core and non-metallic sealing layers. We confirm the following before release to production:
- Flange standard, nominal size, pressure class and facing type, including raised face, flat face or groove.
- Design pressure and design temperature, with excursion and thermal-cycling profile where relevant.
- Medium composition and concentration, so the sealing layer can be matched to chemical exposure.
- Bolt material, bolt load and tightening method, plus the available compression space.
- Valve body cavity dimensions and cavity pressure for middle-cavity service.
- Required gasket thickness, surface finish and any compression stop detail.
- Marking, traceability and documentation scope for project acceptance.
The wavy profile is not a decorative corrugation. Groove depth, pitch and the offset between upper and lower faces determine how many sealing lines contact the flange and how the gasket recovers after bolt load is applied. Those details are fixed on the approved drawing and held through repeat production.
Quality, Acceptance and Installation Support
The metal core and non-metallic layers are combined and pressed into the wavy shape, then finished to the approved drawing. Inspection covers the dimensions that control joint fit: bore, outside diameter, bolt circle, thickness, wave depth and groove alignment. Material identification and batch traceability are maintained through the production route.
- VDI 2440 low-emission test evidence for the JXF7021 construction.
- Dimensional inspection against the approved gasket drawing.
- Inspection and documentation scope agreed at order review.
- Packaging that protects the sealing faces and wave profile during transport and storage.
- Installation guidance covering flange cleanliness, gasket alignment and cross-pattern bolt tightening.
Acceptance requirements vary by project. We align the inspection plan, material records and test certificates with the agreed scope so the gasket arrives with the documentation needed for flange assembly and project handover.
Maintenance, Repeat Supply and Documentation
Wavy active compression gaskets are normally replaced when the flange is broken for maintenance. The compression stop and wave profile are set at manufacture, so field re-tightening cannot restore a deformed sealing layer. Repeat orders are produced to the same approved drawing and material specification, which keeps the joint behaviour consistent across shutdowns.
- Spare gaskets manufactured to the original drawing and batch identification.
- Material certificates, dimensional records and test certificates as agreed.
- Flat, protected packaging for storage before installation.
- Technical support for material selection, mold optimization and process analysis.
- Dual production bases in Zhejiang and Gansu for supply continuity.
Information We Use to Configure Your Solution
A proposal is prepared from the joint data, not from a catalogue size alone. The more completely the working point is defined, the more precisely we can fix the core, sealing layer and wave geometry.
| Project input | What it defines | Detail we need |
|---|---|---|
| Flange or cavity geometry | Gasket fit and sealing line position | Standard, nominal size, pressure class, facing type, bore, outside diameter, bolt circle, groove dimensions |
| Pressure and temperature | Core strength, sealing layer grade and wave recovery | Design pressure, design temperature, excursions, cycling frequency |
| Medium | Chemical compatibility of the non-metallic layers | Fluid composition, concentration, phase, trace components |
| Bolt and compression data | Available bolt load and compression stop | Bolt material, bolt size, tightening method, compression space, flange surface finish |
| Quantity and delivery | Production planning and packing | Annual demand, first order quantity, required delivery window, destination |
| Documentation | Acceptance and traceability scope | Material certificates, dimensional records, test certificates, marking and packing requirements |
Customer Questions
What is the JXF7021 wavy active compression gasket?
It is a metal-core gasket with non-metallic sealing layers, pressed into a wavy profile with offset concentric grooves on both faces. The metal core provides rigidity and a compression stop; the wavy grooves create a multi-channel labyrinth seal. The JXF7021 has passed the VDI 2440 low-emission test and is used in high-temperature, high-pressure, cryogenic, corrosive and thermal-cycling joints.
Which applications suit the wavy active compression gasket?
It fits flange joints where soft gaskets would creep or relax, and where bolt load is limited. Typical service includes low-pressure valve middle cavity sealing, pipe flanges, heat-exchanger connections and vessel openings in high-temperature, high-pressure, ultra-low-temperature, corrosive or thermal-shock conditions.
Can you manufacture non-standard sizes and repeat orders?
Yes. We manufacture to drawings or samples, including non-standard bore, outside diameter, bolt circle, thickness and wave geometry. Repeat orders are produced to the approved drawing and material specification, with batch identification retained for traceability.
What information do you need for a quotation?
Send the flange or cavity drawing, pressure and temperature, medium, bolt load or tightening data, compression space, quantity and required documentation. With those inputs we can confirm the core, sealing layer, wave geometry and packing scope and prepare a configuration-based quotation.
