Rubber Expansion Joints
KXT Single Sphere Rubber Expansion Joint
A compact single-sphere flexible rubber joint designed to isolate vibration, reduce transmitted noise and accommodate axial, lateral and angular movement in piping systems.
Also commonly described as a single sphere flexible rubber joint, rubber flexible joint or spherical-type rubber flexible joint in international piping markets.
- Model
- KXT
- Product Type
- Single Sphere Rubber Expansion Joint
- Size Range
- DN32–DN1200
- Connection
- Flanged
- Available Length
- Multiple lengths by DN; see Technical Specifications
- Movement
- Axial / Lateral / Angular
- Axial Extension
- 6–18 mm
- Axial Compression
- 9–26 mm
- Lateral Displacement
- 9–24 mm
- Angular Deflection
- 15°
- Rubber Options
- NR / EPDM / CR / IIR / NBR / FKM (Viton)
- Flange Options
- GB / HG / ANSI / DIN / BS / EN / JIS
Stock / Fast ShipmentMany common sizes and configurations are kept in stock for faster shipment.
Custom SizeUp to DN3000 on request
Project Configuration
Mingchao can customize the product configuration based on the technical information, operating conditions and dimensional data you provide. Final configuration can be reviewed and manufactured to the approved project drawing.
KXT Single Sphere Rubber Expansion Joint Overview
The KXT is a single sphere rubber expansion joint designed for flexible flanged connections in piping systems. Its compact spherical rubber body helps isolate vibration, reduce transmitted noise and accommodate axial, lateral and angular movement between connected pipe sections.
In different international markets, this product may also be described as a single sphere flexible rubber joint, rubber flexible joint or spherical-type rubber flexible joint. Mingchao supplies the KXT in sizes from DN32 to DN1200, with multiple face-to-face lengths, rubber compounds and flange configurations available for different piping requirements.
The single-sphere design is commonly used where a compact flexible connection is required between piping, pumps or equipment. Custom sizes up to DN3000 and special flange or dimensional configurations are available according to confirmed drawings and project requirements.
Technical Specifications & Movement Capacity
KXT movement and face-to-face dimensions vary by nominal diameter. The table below shows the available lengths and movement values provided in Mingchao product data.
| DN | Inch / NPS | Length L (mm) | Axial Extension (mm) | Axial Compression (mm) | Lateral Displacement (mm) | Angular Deflection |
|---|---|---|---|---|---|---|
| 32 | 1.25 | 95/130/152 | 6 | 9 | 9 | 15° |
| 40 | 1.5 | 95/130/152 | 6 | 10 | 9 | 15° |
| 50 | 2 | 105/130/152 | 7 | 10 | 10 | 15° |
| 65 | 2.5 | 115/130/152 | 7 | 13 | 11 | 15° |
| 80 | 3 | 130/135/152 | 8 | 15 | 12 | 15° |
| 100 | 4 | 130/135/150 | 10 | 19 | 13 | 15° |
| 125 | 5 | 130/152/165 | 12 | 19 | 13 | 15° |
| 150 | 6 | 130/152/180 | 12 | 20 | 14 | 15° |
| 200 | 8 | 130/152/180/200/210 | 16 | 25 | 22 | 15° |
| 250 | 10 | 130/200/230/240 | 16 | 25 | 22 | 15° |
| 300 | 12 | 130/200/245/260 | 16 | 25 | 22 | 15° |
| 350 | 14 | 200/255/265 | 16 | 25 | 22 | 15° |
| 400 | 16 | 200/255/265 | 16 | 25 | 22 | 15° |
| 450 | 18 | 200/255/265 | 16 | 25 | 22 | 15° |
| 500 | 20 | 200/255 | 16 | 25 | 22 | 15° |
| 600 | 24 | 200/260 | 16 | 25 | 22 | 15° |
| 700 | 28 | 260 | 16 | 25 | 22 | 15° |
| 800 | 32 | 260 | 16 | 25 | 22 | 15° |
| 900 | 36 | 260 | 16 | 25 | 22 | 15° |
| 1000 | 40 | 260 | 18 | 26 | 24 | 15° |
| 1200 | 48 | 260 | 18 | 26 | 24 | 15° |
Dimensions are in millimetres unless otherwise stated. Confirm the required DN/NPS, installation length, flange standard and working conditions before ordering.
Dimensions & Flange Standards
KXT rubber expansion joints can be supplied with different flange configurations for domestic and international piping projects. Flange drilling must be selected according to the mating pipeline or equipment flange; different standards should not be treated as interchangeable.
Verified dimension references are available for GB PN6 / PN10 / PN16, JIS 5K / JIS 10K and ANSI 150LB. The KXT catalog also lists GB, HG, ANSI, DIN, BS, EN and JIS as available flange production options. Project-specific flange drilling and dimensions must be confirmed against the required mating flange.
Flange pressure class and rubber-joint working pressure are separate selection parameters. Confirm both when requesting a quotation.
Rubber Materials & Construction
The KXT uses a single-sphere flexible rubber body between flanged pipe connections. Available rubber compounds include NR, EPDM, CR, IIR, NBR and FKM (Viton).
Rubber compound selection should be based on the conveyed medium, operating temperature, working pressure and project conditions. For water, oil, chemicals, seawater or other special media, the required rubber compound should be confirmed before quotation rather than selected only by product size.
| Item | Available / Configuration |
|---|---|
| Rubber Body | NR / EPDM / CR / IIR / NBR / FKM (Viton) |
| Structure | Single-sphere flexible rubber body |
| Connection | Flanged |
| Flange Configuration | GB / HG / ANSI / DIN / BS / EN / JIS options according to confirmed project requirements |
| Special Dimensions | Custom dimensions according to confirmed drawings and project requirements |
Applications for Pumps, HVAC, Water & Industrial Piping
Pump & Equipment Connections
Helps isolate vibration and reduce vibration transmission between pumps, equipment and connected piping.
HVAC & Refrigeration Systems
Provides a flexible connection for chilled-water, refrigeration and building-service piping where vibration and piping movement must be accommodated.
Water Supply, Drainage & Plumbing
Suitable for flexible connections in water-supply, drainage and plumbing systems requiring vibration reduction and movement compensation.
Industrial & Building-Service Piping
Used in industrial and building-service piping where compact flexible connections are required between pipe sections or equipment.
Fire Protection & Special-Service Piping
Can be applied in fire-protection and other piping systems when the rubber compound, pressure, temperature and flange configuration are confirmed for the operating conditions.
For oil, chemical or other special media, confirm material compatibility and operating conditions before product selection.
How to Select a KXT Flexible Rubber Joint
To select the correct KXT flexible rubber joint, provide the operating and connection information below. These details help confirm product size, flange compatibility, rubber compound and installation configuration before quotation.
- Size — DN / NPS / inch
- Flange standard
- Required working pressure
- Medium / fluid
- Working temperature
- Required rubber compound, if specified
- Face-to-face length
- Required movement or installation condition
- Quantity
- Drawing or existing-product dimensions, if available
Not sure which configuration is required? Prepare the piping conditions or drawing when submitting your quotation request.
Single Sphere vs. Other Rubber Expansion Joints
| Product Type | Configuration |
|---|---|
| KXT Single Sphere Rubber Expansion Joint | Compact standard single-sphere flexible connection. |
| KST Double Sphere Rubber Expansion Joint | Double-sphere configuration for applications requiring different movement geometry. |
| Restrained Rubber Expansion Joint with Tie Rods | For installations requiring restraint / tie rods. |
| JDX Reducing Rubber Expansion Joint | For connections between different nominal pipe diameters. |
Installation Guidelines
Correct installation is essential for reliable rubber expansion joint performance.
Align the piping before installation.
Do not use the joint to correct severe pipe misalignment.
Install the joint in its natural condition.
Do not force it into excessive extension, compression or torsion.
Provide suitable pipe supports, anchors and guides.
The expansion joint should not carry unsupported pipeline weight.
Tighten flange bolts diagonally and evenly.
Apply tightening progressively around the flange.
Support suspended water-supply piping above DN200.
Use a fixed support bracket or a pull-off prevention device as specified in the Mingchao catalog.
Real KXT Product & Application Photos
Technical Documents / Reference Information
- Rubber Expansion Joint Installation Guide
- Verified flange dimension references
- Technical data available for project review
Technical Datasheet
KXT Single Sphere Rubber Expansion Joint
Technical Datasheet · PDF