Drill Pipe Float Valves & Float Subs — Model F & Model G

Model F and Model G Drill Pipe Float Valves

Model F Plunger-Type Float Valve

Model F uses a spring-loaded plunger that moves away from the seat during normal downward circulation. When the pressure below the valve exceeds the pressure above it, the plunger returns toward the seat to restrict reverse flow.
The plunger-style design is commonly used where positive shut-off and a compact internal valve arrangement are required. Available size codes and pressure ratings must be confirmed against the actual installation.

Model FA Ported Plunger Valve

Model FA follows the basic plunger-valve arrangement but includes a port through the plunger. The port allows controlled pressure equalization or limited filling, depending on the valve design and operating procedure.
The port size and intended function should be confirmed before ordering. A ported valve does not provide the same reverse-flow restriction as a fully non-ported valve.

Model G Flapper-Type Float Valve

Model G uses a hinged flapper that opens with downward circulation and closes when reverse flow acts against it. When open, the flapper design generally provides a larger internal flow path than a comparable plunger configuration.
Selection should consider the required flow area, dropped-object clearance, drilling-fluid condition and the internal diameter available through the installed valve.

Ported or Non-Ported Configuration

A non-ported float valve is selected when stronger reverse-flow isolation is required. A ported version allows limited pressure communication or filling through a controlled opening.
The final choice should follow the drilling program and operating procedure. The supplier should not select a ported or non-ported valve only from the drill pipe size.

Inspection and Documentation

Inspection requirements should be confirmed according to whether the order covers a valve, a float sub or a completed valve-and-sub assembly.
For drill pipe float valves, the agreed inspection may include:
Visual inspection

Dimensional inspection
Plunger or flapper movement check
Spring inspection
Seal inspection
Material verification
Hardness testing, where specified
Leakage testing
Differential-pressure testing
Pressure testing according to the agreed procedure
Marking and identification check
For float subs, the inspection may include:
Material certificate
Dimensional inspection
Connection gauging
Recess diameter and depth verification
Magnetic particle inspection
Ultrasonic testing, where specified
Surface-treatment inspection
Final assembly inspection
Packing inspection

The test pressure, holding time, acceptance criteria and witness requirements should be agreed before production. The final document package will follow the purchase order and approved inspection plan.

Float Valve and Float Sub Price

Drill pipe float valves are quoted according to the model, size code, pressure rating, seal material, internal trim, coating and order quantity.
Float sub pricing depends on the material, outside diameter, overall length, pin and box connections, bore, valve-recess machining, inspection scope and quantity.

Standard float valve sizes may be available from stock, while custom float subs normally require drawing confirmation before production. Send the required model or dimensions to check current availability, minimum order quantity and lead time.

Why Choose ELITE Float Valves

Dual Pressure Rating: Rated for 5,000 psi and 15,000 psi working pressure to match standard and high-pressure well conditions.
Full Material Traceability: Every valve batch ships with a Mill Test Certificate (MTC) and inspection report.
API-Compliant Connections: Compatible with standard Reg. and NC. connections (2-3/8″ Reg. through 6-5/8″ Reg. / 5-1/2″ IF).

Drill Pipe Float Valves – FAQ

Q1: What is the difference between a float valve and a float sub?

A: A float valve is the internal check-valve component itself, while a float sub is the drilled-out drill collar or sub that houses the float valve near the drill bit.Q2: What working pressure do ELITE float valves support?

ELITE drill pipe float valves are rated for 5,000 psi or 15,000 psi working pressure, depending on the model and application requirements.

Q3: Should I choose a plunger-type (Model F) or flapper-type (Model G) float valve?

A: Model F (plunger-type) is suited to standard drilling operations requiring durable, economical shut-off. Model G (flapper-type) is better for highly abrasive fluids or high flow-rate applications, since it provides a fully unrestricted bore when open.

Q4: Where is the float valve installed in the drill string?

A: The float valve is installed in a float sub near the top of the drill bit, most commonly within the bottom hole assembly (BHA).”

Q5: What connections are available for float subs?

A: ELITE float subs are available with standard API Reg. and NC connections, ranging from 2-3/8\” Reg. up to 6-5/8\” Reg. / 5-1/2\” IF, matching common drill string sizes.