| Customization: | Available |
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| Media: | Water |
| Temperature: | Ordinary Temperature |
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Definition & Function | -Definition: A German standard swing check valve is a swing check valve designed and manufactured in accordance with German Industrial Standards (DIN standards) and European Standards (EN standards). -Function: Prevents medium backflow in pipelines, avoids reverse rotation of pumps and their driving motors, prevents medium discharge from containers, and can be used in auxiliary system pipelines where pressure may exceed the main system pressure. |
Working Principle | Relies on the force generated by the flow of the medium itself in the pipeline to automatically open and close. When the medium flows forward, the medium pressure pushes the valve disc, making it rotate around the rotating shaft to open, allowing the medium to pass smoothly. When the medium stops flowing or flows backward, the valve disc closes under gravity and reverse medium pressure to block backflow. |
Relevant Standards | - Design and manufacturing: DIN3356 - Structure length: DIN3202 - Flange end dimensions: DIN2501, DIN2547, DIN2526 - Weld end dimensions: DIN3239 - Inspection and testing: DIN3352, DIN3230 |
Advantages | - Automatic sealing: Automatically opens and closes relying on medium flow to effectively prevent backflow. - Flexible installation: Equipped with stainless steel spring, suitable for both horizontal and vertical installation. - Good sealing performance: Sealing surface is overlay welded with CO hard alloy, featuring wear resistance, corrosion resistance, friction resistance, and long service life. - Reasonable structure: Low fluid resistance, reliable sealing, excellent performance, and aesthetic appearance. |
Structural Forms | Usually includes three types: single-disc, double-disc, and multi-disc. The selection mainly depends on the valve diameter, aiming to reduce hydraulic impact when the medium stops flowing or flows backward. |
Material Selection | - Valve body: Gray cast iron (e.g., GG20), ductile iron (e.g., GGG40), or cast steel (e.g., GS20Mn5), complying with standards like DIN EN 10222. - Valve disc: Stainless steel with good wear and corrosion resistance, such as 1.4301 (equivalent to 304 stainless steel). |
Application Scope | Suitable for industries like chemical, petroleum, pharmaceutical, and power. Applicable to media including water, steam, oil, gas, petrol products, nitric acid, acetic acid, etc. Working temperature ranges from -46℃ or -50℃ (stainless steel structure) and -29℃ or -46℃ (carbon steel structure) to 600℃ |
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