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These float (check) valves are installed in float subs (long subs bored out for a specific float) and prevent fluids from backing up in your drill string while adding/removing rods.
We stock these piston-style valves, but flapper-style valves are available.

Model F
The Model F is a plunger-type float valve that provides a positive instantaneous shut off, providing constant fluid control while drilling.
Model FA
The Model FA Pressure-Monitoring plunger-type float valve has a special port running through the plunger of the float valve. The valve is used when monitoring the bit head for gas pressure and allowing differential pressure measuring when required.
Model FC
The Model FC Automatic-Fill plunger-type float valve incorporates a unique key assembly and slotted valve stem to hold the plunger open during run in of the drill pipe and allows the pipe to fill from the bottom, saving time, reducing mess, and avoiding hazards.
Model G
The Model G is a flapper-type float valve that, when opened, offers an unobstructed bore through the float valve.
Model GA
The Model GA Pressure-Monitoring flapper-type float valve is indistinguishable from the Model G with the exception of a tungsten-carbide insert in the flapper valve.
Model GC
The Model GC Automatic-Fill flapper-type float valve incorporates a unique self-releasing key assembly that holds the flapper partially open during run in, allowing the pipe to fill from the bottom.
Model GCA
The Model GCA Automatic-Fill/Pressure-Monitoring flapper-type float valve includes all of the advantages of Models G, GC, and GA.
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