Material:

Bronze is a common material used for these valves due to its corrosion resistance, especially in marine and seawater applications. It's durable and can withstand a variety of conditions.

Maintenance:

Like any mechanical device, bronze lift check valves require periodic maintenance to ensure proper functioning. This might include inspections, cleaning, lubrication, and potential replacement of worn-out parts.

Design:

The valve typically consists of a disc or a ball that moves up and down to allow or prevent the flow of fluid. When the fluid flows in the correct direction, it pushes the disc or ball up, allowing the flow. If the flow reverses, the disc or ball is forced against the seat, preventing backflow.

Drawing: