The twin flapper check valve is a standard coiled tubing string component that 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 seal provides the primary low-pressure seal, while at higher pressure the flapper seals into a metal-to-metal arrangement.
Maximum flow area through the flapper cartridges reduces unnecessary backpressure on the surface pumps. The flow path through the flapper cartridges does not restrict the passage of balls or darts if required during operations such as cementing.
When ordering twin flapper check valves, please specify size and thread connection.
- Full flow-through bore
- Dual sealing in each flapper cartridge (low-pressure seat/seal and high-pressure full metal-to-metal seat/seal)
- Full-bore fluid passage for balls, darts, and plugs
- Removable flapper cartridges