The ZFF Type Float Valve is one kind of unidirectional check valve which can be used in preventing from blowout and well kick to reduce loss of drilling fluid and keep the rig floor clear.
Drill pipe float valve consists of the body and the float valve assembly. The float valve
Drill pipe float valve consists of the body and the float valve assembly. The float valve
assembly is installed into the body when using(sea schema3)the float valve assembly(sea schema1 and schema2) includes cage, valve valve seladisk, spring, side seal, valve guide, valve rod etc. When the assembly not working, the backpressure action of spring make it closed. The valve is opened as circulating mud downward and the mud can flow through it. The valve is closed as there is the backpressure.
Specification of Drill Pipe Float Valve
|
Type
|
O. D.(mm)
|
Bearing Back Pressure
|
Connection
|
Drill Pipe (in)
|
|
ZFF127
|
φ 127
|
35MPa 70MPa
|
NC38× NC38
|
5″
|
|
ZFF159
|
φ 159
|
35MPa 70MPa
|
NC46× NC46
|
6 1/4″
|
|
ZFF165
|
φ 165
|
35MPa 70MPa
|
NC50× NC50
|
6 1/2″
|
|
ZFF178
|
φ 178
|
35MPa 70MPa
|
NC50× NC50
|
7″
|
|
ZFF203
|
φ 203
|
35MPa 70MPa
|
6 5/8REG× 6 5/8REG
|
7″
|
|
ZFF228.6
|
φ 228.6
|
35MPa 70MPa
|
7 5/8REG× 7 5/8REG
|
9″
|
|
ZFF241
|
φ 241
|
35MPa 70MPa
|
7 5/8REG× 7 5/8REG
|
9 1/2″
|