double check valve

introduction to the double check valve

A double check valve refers to the valve with merely two single check valves in close series. It has taken advantages of the single check valve well. Generally speaking, when it is under the negative pressure, the water that momentarily bypasses the first check valve and causes it to close is stopped from going any further by the second stop valve which will close at exactly the same time. But it is able to enable the no air or dirt in the valve and pipe during the whole operation.

Two single check valves in anywhere along a pressure pipe will act jointly as a double check valve. And it is better to know that the farther the two single check valve are apart the more likely that something will act to stop them doing so. No matter what, the double check valve is able to restrict forward flow rates noticeably as a result of the typical design of both types of check valve.

The double check valve is popular for the wide applications because it is purely to stop pollution of the mains. Otherwise, the negative mains pressure will permit dirty groundwater to infiltrate the mains pipe - possibly including road run-off, contaminated groundwater from industrial activities, or sewer leakage.

double check valve

Actually, the double check valve is the valve which has taken advantages of the previous single check valves. And the DCV is short for the double check valve which is designed to transfer clean fluid from a supply vessel to a use site. The fluid supply vessel is connected to the valve supply port (chimney) using a lure connection or tubing. The fluid is withdrawn from the supply vessel by a syringe or other device connected to the aspiration port. When the syringe is compressed the fluid is then transferred, through the exit port, to the use site without adulterating the fluid.