The DRVZ and H42X silent check valves consist of a valve body, valve seat, fluid guide, valve disc, bearing, and spring. The internal flow channel features a streamlined design, resulting in low pressure loss and a very short valve disc opening and closing stroke. This allows for rapid closure when the pump stops, preventing loud water hammer noise and achieving a silent operation. This valve is primarily used in water supply, drainage, fire protection, and HVAC systems. It can be installed at the pump outlet to prevent backflow of the medium and water hammer damage to the pump.