Single Sphere Rubber Expansion Joint
• DN32–DN5000 (1.25″–200″) single sphere rubber expansion joint
• PN10 / PN16 / PN25 | Class 150 / Class 300 pressure rating
• EPDM, NBR, Natural Rubber, Neoprene, SBR elastomer options
• Carbon steel Q235 galvanized or stainless steel 304/316/316L flanges
• Superior vibration absorption and multi-axis displacement compensation
Gaoshan Valve — Single Sphere Rubber Expansion Joint
Model: Single Sphere Rubber Expansion Joint | Pressure: PN10 / PN16 / PN25 | Class 150 / Class 300 | Connection: Flanged | Medium: Water, Sea Water, Sewage, Mild Acids, Alkalis, Oils, Compressed Air
Product Overview
The Single Sphere Rubber Expansion Joint is a flexible pipeline connector engineered to absorb vibration, compensate for multi-directional displacement, and reduce system noise in industrial and municipal piping systems. Its single-arch spherical rubber body, reinforced with high-tensile fabric plies and integrated with swiveling carbon steel or stainless steel flanges, delivers exceptional combination movement capability—simultaneously handling axial extension and compression, lateral offset, and angular deflection. Manufactured from premium elastomers including EPDM, NBR (Nitrile), Natural Rubber, Neoprene, and SBR, each joint is purpose-selected to match the chemical compatibility and temperature requirements of the conveyed medium. With sizes ranging from DN32 to DN5000 and pressure ratings from PN10 to PN25 (Class 150 to Class 300), this expansion joint is the go-to solution for pumps, chillers, HVAC systems, water treatment plants, and industrial process pipelines worldwide.
Key Advantages
Superior Vibration Absorption
The elastomeric body effectively damps mechanical vibrations and isolates structure-borne noise generated by pumps, compressors, and other rotating equipment, protecting downstream piping and extending the service life of connected machinery.
Multi-Axis Displacement Compensation
Accommodates simultaneous axial extension and compression, lateral misalignment, and angular deflection in a single compact unit, eliminating the need for multiple hardware compensators and simplifying pipeline layout and installation.
Five Elastomer Options for Media Compatibility
Choose from EPDM (hot water, steam condensate, mild acids), NBR/Nitrile (oils, fuels, hydrocarbons), Natural Rubber (general water, abrasive slurries), Neoprene (refrigerants, moderate chemical resistance), or SBR (economical general-purpose water service) to match your specific application.
Heavy-Duty Reinforced Construction
Features multiple layers of high-strength nylon-cord fabric reinforcement vulcanized within the rubber body, delivering a minimum 3:1 safety factor against burst pressure. The integrated swiveling flange design allows bolt-hole alignment without twisting the joint during installation.
Global Standard Flange Drilling
Flanges are available drilled to GB, ASME/ANSI B16.5 Class 150/300, DIN, BS EN1092, and JIS standards. Material options include carbon steel Q235 with galvanized or coated finish, and stainless steel 304, 316, or 316L for corrosive environments.
Compact, Low-Maintenance Design
The single-sphere geometry provides maximum movement capacity within a minimal face-to-face length, making it ideal for tight installation spaces. No internal guides, packing, or moving metal parts means zero routine maintenance is required after installation.
Elastomer Material Selection Guide
| Elastomer | Temperature Range | Recommended Media | Key Properties |
|---|---|---|---|
| EPDM | −15°C to +115°C | Hot water, steam condensate, mild acids, alkalis, cooling water | Excellent heat and ozone resistance; broad chemical compatibility with polar solvents; ideal for HVAC and water treatment. |
| NBR (Nitrile) | −15°C to +100°C | Oils, fuels, hydrocarbons, petroleum-based fluids | Superior oil and fuel resistance; good abrasion resistance; suitable for petrochemical and fuel transfer applications. |
| Natural Rubber (NR) | −20°C to +80°C | General water service, abrasive slurries, wastewater | High tensile strength and resilience; excellent abrasion resistance for slurry and solids-laden media. |
| Neoprene (CR) | −15°C to +100°C | Refrigerants, seawater, moderate chemicals | Good weathering and flame resistance; moderate oil and chemical resistance; suitable for refrigeration and marine service. |
| SBR | −15°C to +80°C | General water, sewage, non-aggressive fluids | Economical general-purpose option; good abrasion resistance; cost-effective for standard water and drainage applications. |
Technical Specifications
| Parameter | PN10 | PN16 | PN25 |
|---|---|---|---|
| Nominal Pressure | 1.0 MPa | 1.6 MPa | 2.5 MPa |
| Burst Pressure (Min.) | 3.0 MPa | 4.8 MPa | 7.5 MPa |
| Vacuum Rating | −650 mmHg (86 kPa) | ||
| Safety Factor | ≥ 3:1 (burst pressure ≥ 3 × rated working pressure) | ||
| Elastomer Body Material | EPDM / NBR / Natural Rubber / Neoprene / SBR (selectable) | ||
| Reinforcement | Multi-layer high-tenacity nylon-cord fabric (fully vulcanized) | ||
| Swivel Flange Material | Carbon Steel Q235 (galvanized or coated) / Stainless Steel 304 / 316 / 316L | ||
| Flange Standard | GB/T 9119 / ASME B16.5 (Class 150, Class 300) / DIN / BS EN1092 / JIS B2220 | ||
Dimensions & Movement Capability (PN10 / PN16)
| DN (mm) | Inch | Length L (mm) | Axial Extension (mm) | Axial Compression (mm) | Lateral (mm) | Angular |
|---|---|---|---|---|---|---|
| 32 | 11/4 | 95 | 6 | 9 | 9 | 15° |
| 40 | 11/2 | 95 | 6 | 10 | 9 | 15° |
| 50 | 2 | 105 | 7 | 10 | 10 | 15° |
| 65 | 21/2 | 115 | 7 | 13 | 11 | 15° |
| 80 | 3 | 135 | 8 | 15 | 12 | 15° |
| 100 | 4 | 150 | 10 | 19 | 11 | 15° |
| 125 | 5 | 165 | 12 | 19 | 13 | 15° |
| 150 | 6 | 180 | 12 | 20 | 14 | 15° |
| 200 | 8 | 210 | 16 | 25 | 22 | 15° |
| 250 | 10 | 230 | 16 | 25 | 22 | 15° |
| 300 | 12 | 245 | 16 | 25 | 22 | 15° |
| 350 | 14 | 255 | 16 | 25 | 22 | 15° |
| 400 | 16 | 255 | 16 | 25 | 22 | 15° |
| 450 | 18 | 255 | 16 | 25 | 22 | 10° |
| 500 | 20 | 260 | 16 | 25 | 22 | 10° |
| 600 | 24 | 260 | 16 | 25 | 22 | 10° |
| 700 | 28 | 260 | 16 | 25 | 22 | 10° |
| 800 | 32 | 260 | 16 | 25 | 22 | 10° |
| 900 | 36 | 260 | 16 | 25 | 22 | 10° |
| 1000 | 40 | 260 | 18 | 25 | 22 | 5° |
| 1100 | 44 | 300 | 18 | 25 | 22 | 5° |
| 1200 | 48 | 300 | 18 | 25 | 22 | 5° |
| 1400 | 56 | 350 | 18 | 25 | 22 | 5° |
| 1500 | 60 | 350 | 18 | 25 | 22 | 5° |
| 1600 | 64 | 350 | 18 | 25 | 22 | 5° |
| 1800 | 72 | 350 | 18 | 25 | 22 | 5° |
| 2000 | 80 | 350 | 18 | 25 | 22 | 5° |
| 2200 | 88 | 380 | 20 | 30 | 25 | 5° |
| 2400 | 96 | 380 | 20 | 30 | 25 | 5° |
| 2600 | 104 | 380 | 20 | 30 | 25 | 3° |
* All dimensions in millimeters. L = Face-to-face (install) length. PN10 and PN16 share the same dimensional envelope; PN25 dimensions are identical up to DN300 with reinforced body construction. For sizes beyond DN2600, custom dimensions are available upon request.
Applicable Media
Sea Water
Sewage & Wastewater
Mild Acids
Alkalis
Oils & Fuels
Compressed Air
Cooling Water
Slurries
Single Sphere Rubber Expansion Joint — Product Image
Single Sphere Rubber Expansion Joint — Structure Diagram
Request a Quote
Gaoshan Valve single sphere rubber expansion joints are available in sizes DN32 through DN5000, with PN10/PN16/PN25 pressure classes and elastomer options including EPDM, NBR, Natural Rubber, Neoprene, and SBR. Swivel flanges can be supplied in carbon steel Q235 (galvanized or coated) or stainless steel 304/316/316L, drilled to GB, ANSI, DIN, BS, or JIS standards. Contact us with your size, pressure, media, and temperature requirements for a tailored quotation.