3/4 in. Schedule 40 PVC Foot Valve Pipe Fitting

247Garden's ERA PVC foot valve is a simple type of check valve installed at the bottom (foot) of a suction line in a pump system, typically used in water wells, ponds, and other water systems. Its primary function is to prevent the backflow of water and maintain the pump's prime. Here's a breakdown of how it works:

Components of a PVC Foot Valve

1. PVC Body: Made of PVC (polyvinyl chloride), which is durable and resistant to corrosion.
2. PVC Screen or Strainer: Covers the inlet to prevent debris and particles from entering the valve and the pump system.
3. Flap/Disc: The internal component that moves to allow water flow in one direction and blocks it in the opposite direction.
4. Spring: Helps in keeping the flap/disc closed when the pump is not operating.
5. Seat: The surface against which the flap or disc seals to prevent backflow.

Working Mechanism

1. Suction Phase (Pump On):

   • When the pump starts, it creates a vacuum that draws water up through the suction line.
   • The decrease in pressure inside the suction line causes the flap or disc inside the foot valve to open.
   • Water is allowed to flow freely into the suction line and towards the pump.

2. Non-Suction Phase (Pump Off):

   • When the pump stops, there is no longer a vacuum to draw the water.
   • Gravity and any back pressure from the water column in the suction line push the flap or disc closed.
   • The closed flap or disc creates a seal against the seat, preventing the water from flowing back down the suction line.
   • This maintains the water level in the suction line, keeping the pump primed and ready for the next operation cycle.

Benefits of a PVC Foot Valve

• Prevents Backflow: Ensures that the suction line stays filled with water, maintaining the pump's prime.
• Debris Protection: The screen or strainer helps prevent debris from entering the pump, which can prolong the pump's lifespan.
• Corrosion Resistance: PVC material is resistant to corrosion, making it suitable for various water conditions.

Applications

• Water Wells: Keeps the water column stable and prevents loss of prime in well pumps.
• Irrigation Systems: Ensures consistent water flow and prevents back-siphoning.
• Ponds and Tanks: Maintains water levels and prevents debris from clogging the pump system.

In summary, a PVC foot valve is a crucial component in pump systems, ensuring efficient operation by maintaining the prime and protecting the system from backflow and debris.