Float Valve

Float Valve (Flapper Type Check Valve) & Float Valve Sub

This Float Valve is normally installed in a standard bore-back of the bit sub, to provide fluid flow control at the bottom of the drill stem. It also prevents backflow of cuttings from plugging the drill bit jets while making connections. Its 70Mpa (10,000psi) working pressure complements today's high pressure BOP stacks.

When the flapper is held open by the built-in latch, the drill pipe fills from the bottom, This eliminates the mess and lost time of filling operations, Running in with the flapper open also reduces the potential of formation damage from pressure surges caused by the bit acting as a piston or ram as it is lowered into the hole. The flapper latch is automatically released by initial circulation of drilling fluid through the valve.

During normal circulation, the flapper is fully opened and out of the way. The large bore of the valve provides minimum flow restriction.

When circulation is stopped, the flapper is closed by the flapper spring, preventing backflow through the bit.

When run in the closed position, the valve allows the drill pipe to be floated in while only partially filled with drilling fluid. This lowers the effective weight of the drill string and reduces strain on rig equipment.

The Float Valve Sub is a bit sub in which a float valve is installed. Its connection is ordered by user. The Supplier put a float valve into the bore of the sub according to specification of standard API. Mechanical property of material of sub conforms to the requirement of standard SY5200-93 and API.

Specifications: mm

Dia. of Valve Assembly	Length of Valve Assembly	Dia. of Float Recess	Sub Box		Other Popular connections
Dia. of Valve Assembly	Length of Valve Assembly	Dia. of Float Recess	Type	Depth Of Recess		Type	Depth Of Recess
42.07	149.23	42.86	2-3/8Reg.	231.78		NC23	231.78
61.12	165.1	61.91	3-1/2Reg.	266.7		NC31	260.35
88.11	211.14	88.9	4-1/2Reg.	325.44		NC44	331.79
121.44	298.45	122.24	6-5/8Reg.	431.8		5-1/2IF	431.8
144.46	371.48	145.26	8-5/8Reg.	514.35		6-5/8IF	504.838

Check Valve

Arrow Type Check Valve used to be installed between drill stem and bit to prevent drilling fluid backflow from the bottom. The body is a crossover sub in which the other parts are installed. When backflow occurring, the Arrow will press to valve seat so that the fluid can not flow upwards through the valve. When Arrow falls on the down seat, the circulating of drilling fluid can flow through the valve without pressure loss.

Specification： mm

O.D of body	I．D of Bore	Overall Length	Box	Pin
86	34	340	NC26	NC26
105	44	480	NC31	NC31
121	57	540	NC38	NC38
127	57	540	NC38	NC38
165	70	550	NC50	NC50
178	70	550	NC50	NC50
194	76	575	5-1/2FH	5-1/2FH

Drop-in Check Valve is an internal preventer. When blowout is going to happen, the Kelly should be removed immediately and the check pressure valve assembly should be put into the water hole and then pumped downward to the required place. Thus, the blowout can be prevented. The valve body connect on the drilling stem, Drop-in check valve is ball and seat of heavy duty, if only drop in the valve core at the mouth of the well, it turn into the valve body.

Specification：

Type	O.D. of Valve Core Assembly	Sub Body		Connection API	Overall Length
Type	O.D. of Valve Core Assembly	O.D.mm	I.D.mm	Connection API	Overall Length
FT105-1	36	105	37.6	NC31	574
FT105-2	39	105	40.5	NC31	572
FT111	36	111	37.6	NC31	569
FT121-1	44	121	46	NC38	706
FT121-2	51	121	53	NC38	794
FT127-1	52	127	54	NC38	794
FT127-2	51	127	53	NC38	794
FT159-1	68	159	70	NC46	867
FT159-2	68	159	70	NC50	867
FT162	69	162	71	NC50	872
FT165	74	165	76	NC50	878
FT168-1	68	168	70	NC50	867
FT168-2	67	168	69	NC50	861
FT178	68	178	70	NC50	867
FT190	78	190	80	5 1/2FH	906
FT203-1	68	203	70	6 5/8REG	890
FT203-2	67	203	69	6-5/8REG	883

Drilling Equipments

Oil Production Equipments

Other Service Tools

Float Valve

Check Valve