Didtek Check Valve are used to allow flow through a pipeline in one direction and prevent flow (check) from returning in the opposite direction. Check valves are commonly installed on the discharge side of the pump. The most important role of a check valve is to act as the automatic shut off valve when the pump stops to prevent draining of the system.
Didtek Check Valve, also known as a non-return or one-way valve, is a mechanical device that allows a gas or liquid to flow freely in one direction while preventing reverse flow in the opposite direction. The direction in which the fluid or gas can flow is called the free flow direction; the direction in which fluid is prevented from flowing is called the checked or non-return direction.
When the pressure behind the valve is higher than the pressure in front of it (a condition known as the cracking pressure), the valve opens and permits the flow of the contained fluid in the chosen direction. When the pressure behind the valve lessens, the valve closes to prevent what has already passed through it from flowing backward in the wrong direction.
You must think about the needs of your system in order to choose the right type of check valve. You also need to think about the size and other specs for the pipes or systems.