Dart Check Valve (DCV)

The dart check valve is designed for forward circulation of fluid through coiled tubing and to prevent backflow of wellbore fluids into the coiled tubing string. It is used during well workover and major repair operations performed with coiled tubing units. Design features and operating principle: The dart check valve is designed for forward circulation of fluid through coiled tubing and to prevent backflow of wellbore fluids into the coiled tubing string. The body incorporates gripping grooves for engagement with a horn-type wrench. Seal integrity of the threaded connections is ensured by rubber seals supplied as part of the delivery package. The valve is run in hole on coiled tubing assembled with another downhole tools. During the operational procedure, if back pressure develops, the valve prevents reverse flow of wellbore fluid into the coiled tubing by means of spring-loaded flaps. To open the valve, the applied back pressure must exceed the pressure acting below the valve.