Float Valve Sub

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 re-flowing drilling. When blowout occurs, it can serve as splash valve to prevent liquid flowing into drilling tools.
Type: Plunger Type Float Valve and Flapper Type Float Valve.

1. 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.

2. 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.
   Float subs are used to house a float valve, also known as a back pressure valve. The float valve 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.
   
   
   Technical Parameters-- Float Valve Sub

3. Model	Sub O.D.(mm)	Joint connection	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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