What is the function of a foot valve? What is the principle of use?

What is the function of a foot valve ? What is the operating principle?

Foot valve is a type of valve installed at the bottom of the suction pipe in a water pumping system. It is mostly used with a water pump to help the system suck water continuously without backflow and to help retain water in the suction pipe, helping the next time the water pump is started faster.

Function of foot valve

Installing a foot valve helps the water suction pipe work efficiently and reduces the load on the water pump to some extent. The main functions of the foot valve are as follows:

• Prevents backflow of water : When water is drawn up through the pipe, the foot valve system automatically shuts off when the pump stops, preventing water from flowing back into the well or upstream.
• Helps save energy and prevent damage to the water pump : Having water in the pipe helps the pump work faster, reducing the D ry R un operation that can damage the pump.
• Increase the life of the pump system : by reducing the surge when water flows back, which can damage the pipes or pump.

Working principle of foot valve

Foot valves work similarly to ball check valves that automatically open and close according to the direction of fluid flow. The important structures include :

• Cover or disc inside the valve : Opens when there is suction from the water pump and closes immediately when the suction stops.
• Filter screen : Attached to the end of the suction pipe, it filters out dirt and debris to prevent it from clogging the system.

The components and working principle of the foot valve ensure that water flows into the pump without any dirt or debris and prevents loss of water volume in the pipe during pump shutdown.

What type of applications are foot valves suitable for ?

Foot valves are suitable for applications requiring water suction from underground water sources. Such asN Water pumping systems in agricultural areas, Irrigation systemN, Water supply systems in large buildings andIndustrial work that uses a water pumping system from a tank or well By usingworkIn conjunction with Pump type Self-Priming Or a centrifugal pump with suction power that cannot suck water if there is no coolant in the pipe.

How to choose the right foot valve ?

Selecting a foot valve should take into account several factors together to ensure efficient use and function as desired. Consider the following:

• Pipe size : Select the size that is appropriate for the diameter of the suction pipe.
• Material : Choose materials that are appropriate for the location, such as cast iron, brass , or stainless steel .
• Type of filter screen : Should be selected with appropriate frequency to prevent clogging.
• Pressure and flow rate : Make sure it can handle the pressure in the system being used .

Foot valves are small but crucial components in water pump systems , particularly those that require pumping water from sources with low volumes and potential contaminants. They prevent backflow, maintain water levels in pipes , and extend the life of the water pump.

If you’re looking for a high-quality foot valve for your water pumping system, whether for industrial, agricultural , or general use, the Aisa Pacific Supply team is happy to provide advice. With over 29 years of experience importing and distributing valve system equipment, we can help you find the perfect purchase that best meets your needs.