Check valves, essential for preventing backflow and ensuring pipeline system safety, come in various designs each suited to specific applications. Understanding the differences between the main types—Lift, Swing, and Butterfly—and their correct installation is crucial for optimal performance. Check valves are primarily categorized by structure.Lift Check Valves feature a disc that moves vertically and are subdivided into Vertical Lift and Horizontal (or Globe) Lift types, requiring specific orientation. Swing Check Valves use a hinged disc that swings open and include Single-Disc, Double-Disc (Dual Plate), and Multi-Disc variations, known for their flexibility. Butterfly Check Valves (or Wafer Check Valves) employ a disc that rotates on a shaft, offering a compact, straight-through design common in large-diameter pipes. Connection methods across these types typically include Threaded, Flanged, and Welded ends.The main check valve product names of China Check Valve Network include:Wafer Lift Wafer Check Valve，Wafer Vertical Lift Check Valve，Flange Straight-through High Pressure Check Valve，Wafer Vertical High Pressure Check Valve，Flange High Pressure Lift Check Valve，Welded Lift Angle-type Check Valve，Internal Thread,Socket Welded Vertical Check Valve

Correct installation is non-negotiable for functionality. For Lift Check Valves, standard horizontal lift types must be installed on horizontal pipelines. Vertical lift check valves and bottom valves are designed for vertical pipelines, with the critical requirement that medium flows strictly from bottom to top. Swing Check Valves offer more placement flexibility and can be installed on horizontal, vertical, or inclined pipelines, though flow direction remains key. The universal rule during installation is to align the pipeline's normal flow direction with the arrow marked on the valve body. Incorrect orientation will block flow. A special note: Bottom Valves, a subtype of lift checks, must be installed at the very lowest point of a pump's suction line.

In summary, selecting the right check valve—be it lift, swing, or butterfly—depends on your pipeline layout, flow direction, and application. Ensuring precise installation according to these fundamental principles is the key to achieving reliable backflow prevention, protecting equipment, and maintaining long-term system integrity.

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