Check valve/flange check valve

Characteristics and applications of ductile iron foot valves and swing check valves

Ductile iron has become an ideal material in the field of valve manufacturing due to its high strength, corrosion resistance and excellent casting performance. The graphite inside is distributed in a spherical form, which significantly improves the tensile strength and toughness of the material. At the same time, it has good shock absorption performance and can adapt to shock and pressure fluctuations under complex working conditions. Foot valves and swing check valves made of ductile iron show excellent reliability and economy in fluid control systems.

Structure and functional characteristics of the foot valve

The ductile iron foot valve is a check valve installed at the suction port of the pump, mainly used to prevent the liquid from flowing back during shutdown and ensure the rapid start-up of the pump. Its valve body adopts a streamlined design, combined with the wear-resistant characteristics of ductile iron, which can effectively reduce fluid resistance and cavitation risks. The foot valve is usually equipped with a filter to prevent impurities from entering the pipeline system, and is suitable for municipal water supply, agricultural irrigation and other scenarios. Its sealing surface is mostly made of rubber or polytetrafluoroethylene to ensure that it can still be tightly closed under low pressure conditions.

Design advantages of swing check valve

Swing check valve achieves one-way interception through a hinged valve disc, which can rotate around the axis to respond to changes in fluid direction. The ductile iron valve body gives it high pressure bearing capacity and water hammer resistance, which is particularly suitable for large-diameter, high-flow rate pipeline systems. The valve has a simple structure and convenient maintenance, and is widely used in petrochemical, sewage treatment and other fields. Its closing speed can be adjusted by counterweight or spring to avoid pipeline vibration problems caused by rapid closing.

Ductile iron foot valves and swing check valves occupy an important position in the industrial and civil fields due to their dual advantages in materials and structures. With the development of intelligent pipeline networks, the performance of the two in terms of leakage prevention and low energy consumption will be further optimized, promoting the upgrade of fluid control systems to high efficiency and environmental protection. In the future, combined with coating technology and intelligent monitoring modules, this type of valve is expected to achieve longer service life and more precise control functions under extreme working conditions.