1. Pressure tested according to ISO5208 standard
2. Material: Brass (CW617N)
3. Disc: Brass disc with silicon rubber seals or ABS disc with NBR seals
4. Size: 1/2''-2"
5. Thread standards: ISO7/1, ISO228, NPT, DIN2999
6. Packaging details: Each valve is individually packed in a polybag, then placed in an inner box, and finally packed into cartons on wooden pallets.
Technical Specification:
| Working Pressure | 1.6 Mpa |
| Tested Pressure | 2.0 Mpa |
| Working Medium | Water, non-corrosive liquids (excluding oil), and saturated steam. |
| Working Temperature | -20°C ≤ T ≤ 150°C |
Function:
A check valve is an automatic device that prevents backflow of the media, protects pumps and motors from reverse rotation, and allows the discharge of media from a container. It can also be used in pipelines where pressure may rise above the system pressure, serving as an auxiliary safety measure.
Classification:
Check valves are categorized based on their structure and installation method:
1. Swing Check Valve: The disc is cylindrical and rotates around the seat axis. This design has lower flow resistance compared to lift check valves, making it suitable for low-flow or large-diameter applications. However, it is not recommended for pulsating flows due to its lower sealing performance. Swing check valves can be single-disc, double-disc, or multi-disc, depending on the valve size and function.
2. Lift Check Valve: The disc moves vertically along the body’s axis. These valves are typically installed in horizontal pipelines and are commonly used for high-pressure, small-diameter systems. The disc may be a ball in some cases. Lift check valves resemble globe valves in shape and have a higher flow resistance. They feature a guided sleeve that allows the disc to move freely. When the media flows, the disc opens under pressure; when the flow stops, it closes automatically, preventing backflow. There are two types: straight-through and vertical, with the latter having a smaller flow resistance.
A check valve is a type of automatic valve that operates based on the flow of the medium, preventing backflow. It is also known as a one-way valve, reflux valve, or backpressure valve.
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