Cast Iron Flap Gate Valve (Non-Return/Overflow Valve)

Key Features and Function

• Primary Function: To allow media (typically water or sewage) to exit a pipe or channel while automatically preventing any backflow (non-return) from entering the system. It also acts as an overflow device.
• Passive Operation: The valve operates solely on the differential pressure of the fluid; it opens when the pressure inside the pipe exceeds the pressure outside (or the water level), and it closes when the flow ceases or reverses.
• Material: Constructed from durable Cast Iron, providing strength and longevity for use in harsh underground and submerged environments.

Applications

This valve is predominantly utilized in civil engineering and water infrastructure projects:

• Sewage Treatment Plants: Preventing treated water from flowing back into the facility.
• Drainage Systems: Installed at the end of culverts or outfall pipes where they discharge into rivers, lakes, or the sea, preventing high tides or floodwaters from entering the drainage network.
• Stormwater Management: Controlling the discharge of stormwater.

Installation Methods

The Cast Iron Flap Valve is designed for secure, external mounting:

1. Concrete Installation: Installed on the wall or the end of a water channel by secondary concrete casting, which fully embeds and seals the valve body into the structure.
2. Fastener Installation: Installed on the wall or the end of a pipe using fasteners, expansion anchors, and sealant for a robust mechanical and leak-tight connection.

Main Component Materials