This Float Valve is normally installed in a standard bore-back of 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.

Type	Dia. of Valve Assembly	Length Of Valve Assembly	Dia. Of Float Recess	Sub Box		Other Popular Connections
	mm(inch)	mm(inch)	mm(inch)	Connection	Depth Of Recess	Connection	Depth Of Recess
				API	mm(inch)	API	mm(inch)
1R	42.1(1-21/32)	149.2(5-7/8)	42.9(1-11/16)	2-3/8Reg.	231.8(9-1/8)	NC23	231.8(9-1/8)
2F-3R	61.1(2-13/32)	165.1(6-1/2)	61.9(2-7/16)	3-1/2Reg.	266.7(10-1/2)	NC31	260.35(10-1/4)
3-1/2 F	79.4(3-1/8)	254(10)	80.2(3-5/32)			NC38	362.0(14-1/4)
4R	88.1(3-15/32)	211.1(8-5/16)	88.9(3-1/2)	4-1/2Reg.	325.4(12-13/16)	NC44	331.8(13-1/16)
5R	98.4(3-7/8)	247..7(9-3/4)	99.2(3-29/32)	5-1/2Reg.	374.7(14-3/4)	NC50	368.3(14-1/2)
5F-6R	121.4(4-25/32)	298.5(11-3/4)	122.2(4-13/16)	6-5/8Reg..	431(17)	5-1/2IF	431.8(17)
When ordering or requesting quotation, if size out of above specification, pls. specify clearly.