Double Sphere Rubber Joint

Size Range: DN40-600

Pressure: PN10/PN16

Body Materials: EPDM

Flanged Materials: Carbon Steel Q235 with Epoxy Coating



  • High quality raw material

    The flange is forged with JB / T 81-94 standard. No difference.

  • Prevents the sphere from being pulled off

    It has limit bolts to prevent the ball from pulling off.

  • High strength of sphere

    It has a compression ring made of carbon steel. A steel cord is wound around the ball cord to increase the ball strength.

  • Compression and tension resistant EPDM rubber

    The rubber sphere is made of EPDM rubber. And the rubber content is more than 40%. It has the characteristics of tensile resistance, compression resistance, aging resistance, high temperature resistance and low temperature resistance.

  • Every product is strictly inspected

    Each product will be inspected for sphere appearance, hardness, air tightness, pressure resistance and flange pull-out prevention before leaving the factory. Unqualified products are strictly not allowed to leave the factory.

  • Spray to prevent rust

    The flange is spray-treated. Spray thickness is greater than 250um, which can reduce the rust generated in humid environment by more than 70% and improve the anti-oxidation rate by more than 20%.


Applicable pressure:PN10/PN16
Applicable temperature: 0℃ ~120℃ 
Suitable medium :Water
Body material:EPDM
Application fields:  Municipal construction, water conservancy project, water supply and drainage, "water treatment etc, water chiller system, HVAC and mechanical.


Executive Standard
Name Design and manufacture Face to face Length Pressure Test End flange    
Reference standard GB/T26121 GB/T26121 GB/T26121 GB/T9116;ANSI B16.5;DIN EN 1092-1;JIS B2220    
Material of Main Parts
Name Rubber Ball Flange        
Material EPDM Carbon Steel Q235 with Epoxy Coating        
Optional NBR/Silicone/PTFE lined EPDM 304/304L/316/316L        
size   pn10 PN16
DN NPS(Inch) L ΦK N-Φd ΦK N-Φd
DN50 2" 165 125 4-Φ18 125 4-Φ18
DN65 2.5" 175 145 4-Φ18 145 4-Φ18
DN80 3" 175 160 8-Φ18 160 8-Φ18
DN100 4" 225 180 8-Φ18 180 8-Φ18
DN125 5" 225 210 8-Φ18 210 8-Φ18
DN150 6" 225 240 8-Φ22 240 8-Φ22
DN200 8" 325 295 8-Φ22 295 12-Φ22
DN250 10" 325 350 12-Φ22 355 12-Φ26
DN300 12" 325 400 12-Φ22 410 12-Φ26


Check valves, globe valves, ball valves, filters, rubber joints, etc. are commonly used pipe accessories in fluid pipelines, with functions such as cut-off, regulation, diversion, prevention of backflow, pressure regulation, diversion, or pressure relief. It is commonly used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil products, liquid metals, and radioactive media.


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Contact us now if you have any questions about our company and products.We will retain your information completely private.


Who should we contact if there is after-sale problem?

You can send mail to or call us directly to Ms.Shirley. Business scopes spreads to middle China,West China,East China,South China and 76 countries &areas all over the world. We are familiar with all types of enterprises development strategy. Through reliable products and perfect services, the brand of Bundor has won extensive praise from customers.

What certificated does the factory have?

Bundor has 117 products patents and passes CE, CU-TR, API, WRAS, ISO9007, ISO18001, ISO14001, AAA credit grade certificate. Strictly in accordance with ISO, API, JIS, DIN and other standards for valve production, the factory has a perfect enterprise standardization system, has more than 80 sets of high-precision mechanical equipment and quality testing equipment. Can provide more than 10000 kinds of valve models, with a perfect computer system, with independent product research and development capabilities.

Which port is the nearest port from factory?

Bundor valve is located in jinan area, tianjin city, is a collection of scientific research, design, production, sales and after-sales service as one of the professional valve manufacturers, its main export port is tianjin port. Tianjin port is an important comprehensive port and foreign trade port in north China. After the order is confirmed, production can be arranged in 24 hours to ensure the delivery time. Bundor valve always adhere to science and technology and quality peers, dare to innovate, the pursuit of excellence.

What’s the payment terms?

T/T, L/C, D/P D/A, PayPal, Western Union, Cash, Escrow are all allowed. Bundor valve has a set of perfect international trade system. From international trade marketing promotion to international trade negotiations, the group's international trade market of Bundor has been developing steadily in developing countries and regions such as Asia, Africa and Latin America, and has successfully opened markets in developed countries and regions such as Europe and America.

Founded in 1990s, Bundor is an experienced manufacturing and trading combo specialized in the research & development, production and sales of Butterfly valve, gate valve, check valve, globe valve and other valves. 26 years adhering to the principle of manufacturing process of competent valve fittings,the control of valve manufacturing throughout all the production processes, correctly understand customer requirements, and commit to provide products that ensure customer satisfaction.Our team