# DN15-DN50 Double Spheres Threaded Connection Rubber Expansion Joint Connector
## Product Overview
The **DN15-DN50 Double Spheres Threaded Connection Rubber Expansion Joint** is a high-performance flexible connector designed to protect piping systems from vibration, noise, thermal expansion, and pipe misalignment. Featuring a dual-sphere (twin-arch) rubber bellows design with threaded union connections, this joint provides superior flexibility and ease of installation in compact piping layouts.
## Key Features
**Double Sphere (Twin-Arch) Design** – The dual-sphere configuration offers excellent axial, lateral, and angular movement absorption capability, effectively compensating for pipe expansion, contraction, and installation inaccuracies.
**Threaded Union Connections** – Equipped with galvanized malleable iron or ductile iron female threaded unions (BSP, NPT, or DIN 2999 threads available), enabling quick and secure installation without the need for flange alignment.
**Four-Way Movement** – Allows for axial compression/extension, lateral deflection, and angular movement in multiple directions.
**Vibration and Noise Reduction** – The rubber body effectively absorbs mechanical vibrations and reduces system noise, protecting pumps, compressors, and other rotating equipment.
**Compact and Lightweight** – Smaller volume and lighter weight compared to flanged counterparts, making it ideal for space-constrained installations.
## Technical Specifications
**Dimensional Data (DN15 to DN50)**
For nominal diameters ranging from DN15 (½ inch) through DN50 (2 inch), the overall length typically ranges from 165mm to 220mm depending on the specific size and manufacturer. Axial compression capacity reaches up to 22mm across all sizes, while axial extension capacity ranges from 5mm to 6mm. Lateral displacement capability is also rated at 22mm for the full size range.
**Operating Conditions**
The joint is rated for nominal pressures of PN 10 to PN 16 (equivalent to 10 to 16 bar), with a test pressure of 1.5 times the working pressure. Bursting pressure can reach up to 30 bar. Vacuum rating is generally 16 to 53 kPa (400 mm Hg). The standard temperature range spans from -10°C to +115°C, though this varies depending on the rubber material selected.
## Material Options
The joint is available with various rubber compounds to suit different media and operating conditions:
**EPDM** – Suitable for temperatures from -10°C to +115°C. Ideal for water, seawater, hot water, mild chemicals, and outdoor weather-resistant applications.
**NBR (Nitrile)** – Suitable for temperatures from -10°C to +90°C. Designed for oils, fuels, fats, grease, and petroleum products.
**Natural Rubber** – Suitable for temperatures from -10°C to +80°C. Used for general-purpose applications involving water and air.
**Neoprene (CR)** – Suitable for temperatures from -10°C to +100°C. Handles moderate chemicals, oils, and offers ozone resistance.
**Construction Components**
The inner core and outer cover are manufactured from the selected rubber compound. Reinforcement consists of nylon cord fabric with steel wire cord layers to ensure pressure resistance. The threaded unions are produced from galvanized malleable iron or ductile iron, with stainless steel T-304 or T-316 available as an option.
## Applications
The DN15-DN50 Double Spheres Threaded Rubber Expansion Joint is widely used in HVAC systems for heating and chilled water pipelines, pump connections on both suction and discharge lines to reduce vibration transfer, water and wastewater treatment facilities including pump stations and treatment plants, chemical and petrochemical industries for corrosive media handling when paired with appropriate rubber compounds, industrial piping in steel mills, pulp and paper mills, and power generation facilities, plumbing systems in commercial and residential building services, and oil and fuel lines when equipped with NBR compound for oil resistance.
## Advantages
**Cost-Effective Solution** – Lower cost than flanged joints with simpler and faster installation.
**Electrolysis Prevention** – The non-metallic rubber body eliminates metal-to-metal contact that can cause galvanic corrosion.
**Easy Installation** – Threaded connections allow rapid assembly and disassembly for maintenance and replacement.
**Corrosion Resistance** – Galvanized unions and rubber body resist corrosion in aggressive environments.
**Seamless Interior** – The smooth bore minimizes pressure drop and prevents media accumulation or sediment buildup.
## Product Overview
The **DN15-DN50 Double Spheres Threaded Connection Rubber Expansion Joint** is a high-performance flexible connector designed to protect piping systems from vibration, noise, thermal expansion, and pipe misalignment. Featuring a dual-sphere (twin-arch) rubber bellows design with threaded union connections, this joint provides superior flexibility and ease of installation in compact piping layouts.
## Key Features
**Double Sphere (Twin-Arch) Design** – The dual-sphere configuration offers excellent axial, lateral, and angular movement absorption capability, effectively compensating for pipe expansion, contraction, and installation inaccuracies.
**Threaded Union Connections** – Equipped with galvanized malleable iron or ductile iron female threaded unions (BSP, NPT, or DIN 2999 threads available), enabling quick and secure installation without the need for flange alignment.
**Four-Way Movement** – Allows for axial compression/extension, lateral deflection, and angular movement in multiple directions.
**Vibration and Noise Reduction** – The rubber body effectively absorbs mechanical vibrations and reduces system noise, protecting pumps, compressors, and other rotating equipment.
**Compact and Lightweight** – Smaller volume and lighter weight compared to flanged counterparts, making it ideal for space-constrained installations.
## Technical Specifications
**Dimensional Data (DN15 to DN50)**
For nominal diameters ranging from DN15 (½ inch) through DN50 (2 inch), the overall length typically ranges from 165mm to 220mm depending on the specific size and manufacturer. Axial compression capacity reaches up to 22mm across all sizes, while axial extension capacity ranges from 5mm to 6mm. Lateral displacement capability is also rated at 22mm for the full size range.
**Operating Conditions**
The joint is rated for nominal pressures of PN 10 to PN 16 (equivalent to 10 to 16 bar), with a test pressure of 1.5 times the working pressure. Bursting pressure can reach up to 30 bar. Vacuum rating is generally 16 to 53 kPa (400 mm Hg). The standard temperature range spans from -10°C to +115°C, though this varies depending on the rubber material selected.
## Material Options
The joint is available with various rubber compounds to suit different media and operating conditions:
**EPDM** – Suitable for temperatures from -10°C to +115°C. Ideal for water, seawater, hot water, mild chemicals, and outdoor weather-resistant applications.
**NBR (Nitrile)** – Suitable for temperatures from -10°C to +90°C. Designed for oils, fuels, fats, grease, and petroleum products.
**Natural Rubber** – Suitable for temperatures from -10°C to +80°C. Used for general-purpose applications involving water and air.
**Neoprene (CR)** – Suitable for temperatures from -10°C to +100°C. Handles moderate chemicals, oils, and offers ozone resistance.
**Construction Components**
The inner core and outer cover are manufactured from the selected rubber compound. Reinforcement consists of nylon cord fabric with steel wire cord layers to ensure pressure resistance. The threaded unions are produced from galvanized malleable iron or ductile iron, with stainless steel T-304 or T-316 available as an option.
## Applications
The DN15-DN50 Double Spheres Threaded Rubber Expansion Joint is widely used in HVAC systems for heating and chilled water pipelines, pump connections on both suction and discharge lines to reduce vibration transfer, water and wastewater treatment facilities including pump stations and treatment plants, chemical and petrochemical industries for corrosive media handling when paired with appropriate rubber compounds, industrial piping in steel mills, pulp and paper mills, and power generation facilities, plumbing systems in commercial and residential building services, and oil and fuel lines when equipped with NBR compound for oil resistance.
## Advantages
**Cost-Effective Solution** – Lower cost than flanged joints with simpler and faster installation.
**Electrolysis Prevention** – The non-metallic rubber body eliminates metal-to-metal contact that can cause galvanic corrosion.
**Easy Installation** – Threaded connections allow rapid assembly and disassembly for maintenance and replacement.
**Corrosion Resistance** – Galvanized unions and rubber body resist corrosion in aggressive environments.
**Seamless Interior** – The smooth bore minimizes pressure drop and prevents media accumulation or sediment buildup.
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