Flexible Rubber Joint Union Double

Size: 1-1/4”~64”
Material: NR/ EPDM/NBR, Malleable Iorn
Dimension: GB/T26121-2010
Thread: BSPT / NPT female thread
Connection:Flanged drilling as ANSI B16.1 Class 125, EN 1092-2 PN16
Pressure Rating: PN10/PN16/PN25
Temperature: -15℃–+115℃( -30℃–+250℃ )
Surface Treatment: ANSI/AWWA C550
Medium: Water, gas,oil etc.

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Product Description

Products Details

What’s the Flexible Rubber Joint Union Double(union-screw end)?

Double spheres rubber expansion joint (union-screw end) is made by rubber sheets wrapping around a bellows-shape mandrel with two spheres and threaded connection, and it is flexible unit installed in piping system to absorb vibrations and shock, relieve anchor stress, reduce noise, and compensate for misalignment.
The rubber soft joint can also be called: It is a pipeline connection with high elasticity, high air tightness, medium resistance and weather resistance. The rubber joint is a tubular rubber piece composed of inner and outer layers of rubber, ply and steel ring. After being vulcanized at high temperature and high pressure, it is combined with a metal flange or a parallel joint. This product takes advantage of the high elasticity, high gas properties, medium resistance, weather resistance and radiation resistance of rubber, which can reduce the vibration and noise of the pipeline, and can compensate for thermal expansion and contraction caused by temperature changes. This product is widely used in: chemical, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, fire protection, electric power and other basic projects.

Product Drawing


1), according to the performance is divided into general, special, heat-resistant three categories,
General category: suitable for conveying water with a temperature of -15℃~80℃, acid solution or alkali solution with a concentration below 10%. Special type: suitable for special performance requirements, such as oil resistance, plug resistance, ozone resistance, abrasion resistance or chemical corrosion resistance. Heat-resistant: suitable for conveying water with a temperature higher than 80°C
2), divided into single sphere, double sphere, triple sphere, elbow sphere according to the structure.
3) According to the connection form between the product and the pipeline, it can be divided into three types: flange connection, threaded connection and clamp connection.
3. Performance characteristics
1), small size, light weight, good elasticity, easy installation and maintenance.
2) After installation, it can absorb the lateral, axial and angular displacement caused by the vibration of the pipeline; it is not limited by the non-concentricity of the pipeline and the non-parallel flange.
3) After installation, it can reduce the noise generated by the vibration of the pipeline water pump, etc., and has strong vibration absorption ability.
4) The inner seamless high-pressure rubber joint can more effectively prevent the erosion of the inner wall of the rubber joint by the corrosive medium in the pipeline with high temperature resistance, acid and alkali resistance, and oil resistance, and improve the service life.
4. Scope of application
1) Applicable medium: air, compressed air, water, sea water, hot water, oil, acid, alkali, etc.
2) Applicable temperature: -15℃~80℃
5. Structure and Dimensions

Application and Case

Products are used in fire protection system, water system, HVAC system, plumbing, gas system, irrigation system, etc.These products are used in many projects , such as China Taiwanese Building 101, Xiamen Building,Wuhan Expo Building and other famous landmark projects.