Non slam check valve is a specially designed check valve. Its core goal is to control the closing speed of the valve to slow down the sudden change of fluid kinetic energy and eliminate the water hammer effect and mechanical shock in the pipeline system. Its working principle and control method are as follows:
1. Core design principle
Slow closing structure
Use hydraulic damper, spring buffer assembly or staged closing device to make the valve disc close in two stages when the medium backflow begins:
Quickly close to the critical angle (reduce the backflow time of the counterflow medium);
Slowly close completely (the damping structure absorbs the remaining kinetic energy and reduces the pressure shock).
Fluid dynamic optimization
The flow channel design combines the Venturi effect to reduce the impact load when the valve disc is closed by changing the flow rate
2. Performance Advantages
| Terms | illustrate |
|---|---|
| Water Hammer Suppression | Peak pressure fluctuations when closing are reduced by 60-80% (compared to traditional swing check valves) |
| Seal life | The buffer mechanism reduces the rigid collision between the valve disc and the valve seat, extending the service life of the sealing surface |
| Noise Control | Closing process noise ≤55dB (meeting the requirements of quiet environments such as hospitals and laboratories) |
3. Typical applications
High-pressure long-distance water delivery system
Prevent the high-pressure water column in the pipeline from breaking and causing pipe bursting when the pump station suddenly stops;
Precision industrial equipment protection
Used in hydraulic systems and compressed air pipelines to prevent pressure shock from damaging sensors or actuators;
Building water supply and drainage system
Reduce the periodic impact of water pump start-up and stop on pipelines in secondary water supply networks of high-rise buildings.
