A bottom valve, consisting of key components such as a valve body, valve cover, valve disc, sealing ring, and gasket, is a type of check valve. It is specially designed and installed at the very bottom of the pump's suction line to prevent the water in the suction line from emptying after shutdown.
bottom valve drawning
Working Principle:
Water from the source enters the valve body through the valve cover. Under the pressure of the fluid, the valve disc opens, allowing water or other liquid media to flow through. When the pump stops working, the pressure in the outlet pipe quickly closes the valve disc, preventing liquid from flowing back to the water source. This achieves both smooth pumping and water conservation.
Product Features:
Prevents Backflow: Restricts the return of liquid from the pump pipe to the water source, functioning as an inflow-only system. This ensures that the suction pipe is full of liquid when the pump restarts, eliminating the need for additional water addition.
Clog-Resistant: The valve cover has multiple inlets equipped with a screen and reinforcing ribs, acting as a water channel and support, reducing the inflow of debris and lowering the likelihood of clogging the foot valve.
Multiple Connection Methods and Diameter Types: Available in single-disc, double-disc, and multi-disc types, with flange and threaded connections to meet various installation requirements.
Diverse Materials: Common valve body materials include SUS304 and SUS316L stainless steel, but other alloy steels, cast iron, cast steel, and copper are also available upon request. Some models are even fluoropolymer-lined to suit different working environments and media.
Optional Surface Treatments: Valve body surfaces can be mechanically polished or electropolished to a precision of 0.25µm, depending on customer requirements.
Flexible Drive Methods: Foot valves can be operated manually or pneumatically.
Application Scenarios:
Pump Equipment: Primarily used in pumps and other mechanical equipment handling slurries. They are typically installed at the bottom of the pump's underwater suction pipe to prevent slurry backflow and ensure normal pump operation. However, they are generally suitable for clean media; media with high viscosity or excessive particle size are not suitable for foot valves.
Tank Emptying: The foot valve is welded to the bottom of the container, achieving optimal emptying, cleaning, and disinfection effects. It also allows for thorough mixing of the working medium according to various process requirements. Positioning the bottom valve as close to the tank wall as possible ensures a seamless experience without dead zones and prevents turbulence during emptying.
For chemical transportation, fluoropolymer-lined sea valves are installed at the bottom of tank trucks. The main seal is located inside the tank. In the event of accidental damage to pipelines or valves, the tank remains sealed, preventing liquid leakage. Suitable for transporting chemical raw materials, this type of valve improves the safety and reliability of transportation.