Wafer check valves are automatic valves that utilize the flow force of the medium in pipelines to open and close autonomously, primarily used to prevent medium backflow and protect pipeline systems and equipment.
The working principle of wafer check valves: When the medium flows in one direction, the disc opens under fluid pressure; when the medium flows backward, the disc closes under combined action of fluid pressure and its own gravity, thereby cutting off the flow.
Advantages of Wafer Check Valves:
Simple and compact structure: The design is straightforward with small footprint and light weight, suitable for space-constrained pipeline systems.
Easy installation: Sandwiched between two flanges without additional connecting bolts or support devices, enabling quick installation at low cost.
Low flow resistance: Structural design minimizes obstruction to fluid flow, maintaining smooth passage.
Backflow prevention: Core function is preventing medium backflow - the disc closes promptly when flow stops/reverses, protecting pipeline systems.
Simple maintenance: Uncomplicated structure results in low repair costs and long service life.
Disadvantages of Wafer Check Valves:
Limited application scope: While effective for backflow prevention, typically suitable only for small/medium-diameter pipelines, not large-diameter high-pressure systems.
Medium sensitivity: Disc closing speed and sealing performance are easily affected by medium characteristics (e.g., flow variations or contaminated media may cause incomplete closure).
Closing impact: In systems with significant flow fluctuations, valve closure may generate water hammer effects, potentially causing vibrations or damage.
Non-adjustable: Only functions unidirectionally without flow/pressure regulation capability, offering limited functionality.
In summary, wafer check valves excel in simplicity, compactness and easy installation, making them ideal for space-sensitive pipeline systems. However, they may be unsuitable for high-pressure, high-flow applications.
