A check valve, also known as a non-return valve, is a mechanical device that allows fluid (gas or liquid) to flow through it in one direction only. It prevents the reverse flow of the fluid, ensuring that the process operates smoothly and safely. Check valves are commonly used in various industrial processes, water supply systems, and in many household appliances.

The process of a check valve can be broken down by china check valve factory into the following steps:

Inlet flow

Fluid enters the check valve through the inlet (or upstream) side. The pressure of the fluid pushes against the valve’s movable internal component, known as the closure member or disc.

Opening the valve

As the fluid pressure increases, it forces the closure member to open, allowing the fluid to flow through the valve. The design of the closure member can vary depending on the type of check valve (e.g., swing check valve, lift check valve, or ball check valve).

Flow direction

Fluid flows from the inlet side to the outlet (or downstream) side of the valve. The velocity and pressure of the fluid maintain the open position of the closure member, ensuring unobstructed flow.

Reverse flow prevention

If the fluid pressure on the outlet side becomes greater than the inlet side, the closure member is pushed back to its original position, blocking the reverse flow. This ensures that the fluid can only flow in one direction.

Closing the valve

When the fluid pressure equalizes or the flow stops, the closure member returns to its original position, sealing the valve. This prevents backflow and maintains the desired process conditions.