Zhixin Valve CO Ltd

A foot valve is a type of non-return valve that serves a specific purpose in fluid systems. 

1. Function: A foot valve prevents backflow of liquid in a water supply line. It ensures that the fluid flows only in one direction (from the source to the pump) and does not flow back when the pump is turned off.

2. Placement: Foot valves are typically installed at the base level of suction pipes. They are commonly found at the end of a pump suction or at the bottom of pipelines.

3. Working Principle:

   • When the pump starts, a suction force is created, which opens the foot valve.

   • Water or other liquid easily enters the pipe through the foot valve due to the pulling force of the pump.

   • When the pump is turned off, the pulling force disappears, but the foot valve prevents water from flowing back.

   • As a result, the pump remains primed, maintaining the liquid column even when the pump is not working.

4. Advantages:

   • Keeps the pump primed: Foot valves are crucial when pumping liquid from lower to higher levels.

   • Prevents pump damage: Without a foot valve, air would fill the pipe, opposing water flow, and potentially causing the pump to run dry.

   • Energy efficiency: Foot valves reduce energy wastage.

5. Components:

   • Screen: Removes sediments or debris.

   • Body: Houses the complete mechanism.

   • Seat: An integral part of the body, using o-rings to avoid leakage when the valve is closed.

6. Features:

   • Easy installation: Foot valves usually have self-tapping male and female threads.

   • Quick sealing: Internal balls ensure fast sealing and valve reaction.

   • Versatility: They fit various types of water pump uses.

   • Cost-effective: Foot valves are cheaper compared to other valves.

Remember, the strainer in a foot valve plays a crucial role by filtering out debris that could jam the valve and cause damage to the pump.