Conventional Reverse-Flow Check Valves | SLB

Conventional Reverse-Flow Check Valves

Velocity check valves used for gas lift services

Protect casing from backflow

Conventional reverse-flow check valves are velocity check valves used with conventional Camco gas lift and subsurface safety systems that do not have integral reverse-flowcheck valves. The check valves protect the casing from backflow through valves that are below the working valve and allow the application of pressure to the tubing for circulation or acidizing. Reverse-flow check valves also prevent the commingling of production fluids in dual gas lift installations.

Can be converted from velocity check to positive-check valves
Prevents commingled production in dual gas lift installations
Protects casing from backflow with valves below the working valve
Conventional Reverse Flow Valves
Conventional Reverse Flow Valves

This line of valves includes the 1-in [25.4-mm]-OD BF and B-1 valves and the 1 1/2-in [38.1-mm]-OD CF and J-20 valves. These valves each have an elastomeric soft seat and stainless steel hard seat. The initial seal is between the stainless steel check dart and the soft seat. These check valves can withstand 10,000-psi differential pressure and can be converted from velocity check valves to positive check valves by adding a spring.

Reverse-flow check valves require flow to close. As the differential pressure across the check dart of the valve increases, the dart contacts the soft seat and then the hard seat to form a seal and close the check valve.

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