Foot valve for pump are commonly used in applications such as water supply systems, irrigation, and industrial fluid handling to enhance system reliability and performance.
A foot valve is a non-return valve installed in a pump suction or at the bottom of pipelines to prevent water, fluid or chemical from flowing backward when the metering pump is off. The valve keeps the fluid trapped in the suction pipe when the pump stops, thus sustaining a suitable prime for the pump, and preventing pump burnout. When the pump restarts, suction opens the foot valve. The intake side of the foot operated air valve has a screen that prevents larger debris from entering the valve and damaging the internal components.
Working Principle of Foot Valve for Pump
The foot pedal valve in a metering pump operates on a straightforward yet crucial principle, primarily designed to maintain a consistent flow and prevent backflow. Positioned at the suction line and typically submerged in the fluid source, the foot valve for water pump prevents the fluid within the pump from draining back into the reservoir when the pump is not in operation. When the metering pump is activated, it creates a vacuum at the inlet, which opens the foot valve and allows fluid to be drawn into the pump chamber.
During this pumping cycle, the foot valve remains open, ensuring a steady intake of fluid for precise delivery. Once the pump is turned off, the pressure in the suction line decreases, causing the foot valve to close, thereby securing the fluid and maintaining the pump’s prime for efficient operation in subsequent cycles. This mechanism is essential for the effective performance of metering pumps, especially in applications that require accurate fluid delivery and consistent pressure.
What are the Components of Foot Valves?
Foot valve have internal balls for quick sealing and valve reaction. Each foot valve consists of 4 basic components:
- Screen: Designed to filter out sediments and debris.
- Body: The entire mechanism is enclosed within the valve body.
- Seat: An essential component of the body, it utilizes O-rings to prevent leakage when the valve is closed. The valve lands on the seat when the pump is switched off.
- Disc: Acts as the entry point of the foot pedal valve; when the disc is lifted, liquid can flow in.
Materials Used for Foot Valves
Foot valves for water pump are constructed from various materials to ensure durability, corrosion resistance, and compatibility with the fluids they handle. Common materials used for foot valves include:
- Stainless Steel: Known for its excellent corrosion resistance and strength, stainless steel is ideal for applications involving harsh chemicals or environments.
- Brass: Brass foot valves offer good corrosion resistance and are often used in water supply systems. They are durable and can withstand moderate pressure.
- Plastic (PVC, CPVC, PVDF): Plastic foot valves are lightweight, resistant to corrosion, and suitable for use with a variety of chemicals. PVC is commonly used for non-potable water applications, while CPVC can handle higher temperatures.
- Cast Iron: Cast iron is a robust material often used in industrial applications. It offers high strength but may require protective coatings to resist corrosion.
- Bronze: Similar to brass, bronze foot valves provide good corrosion resistance and are commonly used in marine and industrial applications.
Foot valves are typically made from heavy-duty cast iron, bronze, stainless steel, PVC, and various plastics. They are commonly employed in water services, and these materials exhibit enhanced durability when submerged in water.
How to Select Right Foot Valves for Pump
Foot valves are chosen based on several factors, including:
- The specific function the foot valve will serve and the type of fluid involved.
- The valve's duty rating, whether it is designed for heavy-duty or light-duty applications.
- The load that the foot valve is required to support.
- The expected durability of the materials used.
As a trusted supplier of foot valves for water pump from renowned brands, Cannon Water offers high-quality products designed to enhance the performance and efficiency of your pumping systems. Our extensive range of foot valves ensures reliable operation and protection against backflow, making us your go-to source for dependable solutions.