Product Name:  OV15 to OV50 Plastic Non Return Check Valve 

Working Theory

Order to make sure the safety of the drinking water,most countries organizations and countries standards of the piping require that there should install a device on the terminal,which is suitable for guard against flow backwards.Function and structure of KeRuicheck valve core conform to the use standards of guard against flow backwards for most of the countries all over the world.KeRui check valve core is comprehensive used in valve core is comprehensive used in various of pipe valve,faucet,shower and whater meter.It is used in the constant temper ature system to avoid the hot water and cold water mixing.and keep the pressure balance inside the piping as well. 

Function-practical Usein

Check valve only allows the water flow to one direction and avoids the water flowing reversely. So it is called unilateralism valve or stop reverse valve as well.

When under the condition of flowing backwards (Reverse Flow),suppose there is pressure increasing backward position of the valve(back pressure condition),or there is pressure decreasing upwward position of the valve(reverse siphon condition),which would cause the reverse pressure,then the check valve will be closed to avoid reverse flow.

When under the condition(Regular Flow),suppose the water pressure is higher than the spring resistance, then the check valve core would open and make the water flow from the one direction valve.

When under the condition at rest,the check valver closes always,that is because the spring pressure make the valve core seal ring closely joint to the check valve, in that case to keep the check valve closing.