What is the difference between dual plate check valve and non slam check valve?

A dual plate check valve features two plates that pivot on a hinge, allowing for quick closure to prevent backflow, while minimizing pressure loss. In contrast, a non-slam check valve is designed specifically to prevent slamming and water hammer by employing a cushioned mechanism that allows for gradual closure. The dual plate design is more compact and suitable for high-flow applications, whereas the non-slam design focuses on protecting the system from hydraulic shock. Both serve the purpose of preventing backflow, but they operate differently in terms of closure speed and system protection.