Twin Flapper Check Valve with Lock-Out Sleeve

Prevent the backflow of well fluids into the coiled tubing while adding increased safety to your operations.


The twin flapper check valve with lock-out sleeve is a coiled tubing string component that can be run in the locked out position and activated with a drop ball when required to perform as a downhole safety barrier. It prevents the backflow of well fluids into the coiled tubing.

The design of the twin flapper check valve incorporates a dual sealing system in each flapper assembly for increased safety. A nonstick seat provides the primary low-pressure seal, while at higher pressure the flapper seals into a metal-to-metal arrangement.

This valve is ideally suited to CT velocity string systems, allowing activation by a drop ball before pulling the string from the well.

When ordering the twin flapper check valves with lock-out sleeve, please specify size and thread connection.


  • Dual sealing in each flapper cartridge (low-pressure nonstick seat/seal and high-pressure full metal-to-metal seat/seal)
  • Full-bore fluid passage for balls, darts, and plugs
  • Removable flapper cartridges
  • TerraTECH Coiled Tubing Tools Brochure

  • TerraLINK Coiled Tubing Connectors Data Summary