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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