1. H41H, H41Y lift check valves have the advantages of simple structure, reliable action and convenient maintenance, and are widely used in purification equipment, petroleum, chemical, metallurgy, electric power, light textile and other production processes;

2. When the medium flows into the valve body from the direction indicated by the arrow of the valve body, the pressure of the medium acts on the valve clack to generate an upward thrust. When the thrust of the medium is greater than the gravity of the valve clack, the valve opens. When the force of the medium pressure behind the valve acting on the valve disc plus the gravity of the valve disc itself is greater than the force of the pressure before the valve acting on the valve disc, the valve is closed to prevent the medium from backflow.