1. Core Uses
Preventing medium backflow
Using hinged valve disc structure to achieve one-way flow control. When the fluid flows forward, the medium pressure pushes the valve disc open; when the fluid flows in the reverse direction, the valve disc closes due to its own weight or return pressure to block the backflow.
Protecting key equipment
Prevent pumps, motors and other equipment from being reversed or damaged by medium backflow, and prevent accidental discharge of container medium.
2. Typical application scenarios
Pump outlet protection: Installed at the pump outlet to prevent medium backflow when the pump is stopped, causing damage to the impeller; Pipeline boundary: Used as the connection point for pipelines in different systems to ensure one-way flow isolation; Impurity medium scenario: The swing design can adapt to media containing fibers and solid particles (such as sewage treatment pipelines).
3. Additional functions
Eliminate water hammer effect: Reduce the impact of sudden changes in fluid kinetic energy on the pipeline by controlling the closing speed of the valve disc; Auxiliary system pressure relief: Balance the system pressure in the auxiliary pipeline to prevent overpressure risks.
Performance characteristics and advantages
| characteristics | illustrate |
|---|---|
| Structural adaptability | Single-flap, double-flap or multi-flap design available (multi-flap is commonly used for large-diameter pipes) |
| Low flow resistance design | Streamlined channels reduce pressure loss and energy consumption is reduced by 30%-50% compared to lift type |
| Installation flexibility | Supports horizontal, vertical or inclined installation (vertical installation requires ensuring that the medium flows from bottom to top) |
Core differences from other check valves (compared with lift type)
Sealing performance: The sealing performance is weak under low pressure conditions, but stable sealing can be achieved under high pressure conditions through special valve seat design;
Applicable media: It is more tolerant to impure media than lift type, but has lower adaptability to high viscosity fluids.
Selection recommendations
Priority scenarios: Pipe systems with medium and large diameters (DN≥50), impure media, and horizontal/inclined installation; Avoidance scenarios: High-precision low-pressure sealing requirements (such as laboratory pure water systems) are more suitable for lift type or spring-assisted type.
