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Float Valve Sub
Float Valve Sub

Member Details

Mudanjiang,Heilongjiang,China
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Float subs are used to house a float valve, also known as a back pressure valve. it functions as a safety between the well bore and the inside of the drill string to prevent drilling fluids from back flowing up to surface.

 Description: Float subs are used to house a float valve, also known as a back pressure valve. it functions as a safety between the well bore and the inside of the drill string to prevent drilling fluids from back flowing up to surface.

Float Valve Sub is usually connected on the top of the bit to control down hole liquid. While stopping pump and connecting with single, it can prevent waterhole from being plugged by reflowing drillings. When blowout occurs, it can serve as splash valve to prevent liquid flowing into drilling tools.It is divided into plate type float sub and arrow-type float valve sub.

Structure:Float valve sub consists of sub, float valve unit and accessory extractor. While using, float valve unit should be put into joint body. Float valve unit is composed of body, sealed ring, seal gland, valve bonnet, torsional spring and limit marker.

Principle:Working principle of float valve sub is rather simple.When normal drilling and pumping circulation,the bonnet of float valve unit will be opened completely.If well kick or pumping off occurred,the bonnet will close waterhole depends on elastic force of torsional spring.It can prevent blowout in the drilling tool.

Specification of Float Valve Sub

 

type

Joint O.D.mm

Connection

Float Valve O.D.mm

I.D.mm

FFJT241

241.3

7 5/8 REG

ф121

ф76

FFJT228

228.6

7 5/8 REG

ф121

ф76

FFJT209

209.6

6 5/8 REG

ф121

ф76

FFJT203

203.2

6 5/8 REG

ф121

ф71

FFJT178

177.8

4 1/2 IF

ф98

ф71

FFJT165

165.1

4 1/2 REG

ф88

ф57

FFJT146

146

4 1/2 REG

ф88

ф57

FFJT121

121

3 1/2 REG

ф61

ф51

FFJT108

108

3 1/2 REG

ф61

ф38

 

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