check valve for clean water

A check valve for clean water is used to prevent water from flowing backward in the system — meaning it stops water from returning toward the pump or water source. It’s a simple but important component in all types of water installations, especially with pumps, pressure tanks, and piping.

Function

A check valve is a one-way valve:

Water can flow only in one direction (forward).
When the flow tries to go backward, the valve closes automatically.

It protects against:

The pump losing its prime (water filling).
Pressure loss in the system when the pump stops.
Contamination of the water supply from backflow.

Common types of check valves for clean water

Spring-loaded check valve (inline type)
- Installed on the discharge side or in the pipe.
- Closes quickly thanks to a spring mechanism.
- Available in brass, stainless steel, or plastic (e.g. PVC).
- Common thread sizes: 1/2”, 3/4”, 1”, 1 1/4”.
Foot valve (with strainer/filter)
- Placed at the end of the suction line (in the well or tank).
- Includes a built-in check valve + a strainer to keep out debris.
- Keeps the suction line and pump filled with water.
Flap valve
- More common in larger pipe systems or wastewater applications.
- Sometimes used for irrigation or industrial setups.

Material options for clean water

Brass – durable and common for domestic water systems.
Stainless steel – corrosion-resistant, suitable for drinking water.
Plastic (PVC/PP) – lightweight, inexpensive, and chemically resistant; often used in irrigation.

All of these are available in potable-water-approved versions (e.g. WRAS or KIWA certified).

Placement

On the suction line: right before the pump, often combined with a foot valve.
On the discharge side: to maintain pressure and prevent backflow toward the pump.