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Float Valve & Float Sub

API standard drill pipe Float valve is one of necessary tool for drilling, it consists of float valve sub and float valve, the main function are to prevent drill cuttings come into mud when connecting each joint and the bit bore block caused by back flow of silt. When the well blowout or kick, the valve cover of float valve turn off the bore automatically, it will prevent well blowout accident.

>>Introduction

The working pressure of float valve is supposed to be 5000psi or 10000psi.

Plunger-Type Float Valves: 

The Model F is a plunger-type float valve that provides a positive instantaneous shut off, providing constant fluid control while drilling. The Model F is a reliable and economical selection under standard drilling operations.

Flapper-Type Float Valves:

The Model G is a flapper-type float valve that, when opened, offers an unobstructed bore through the float valve. The uniquely designed flapper closes rapidly to prevent shavings from entering the drill string when circulation stops and also assists primary BOP equipment in maintaining internal pressure control. The valve will fully open when the first joint is raised from the hole, preventing pulling wet joints. 

拼图

>>Parameter Table

Model OD
mm(inch)
ID
mm(inch)
Conn. FloatValveType
FZF83 82.6(31/4) 31.8(11/4) NC23B×23/8REGB 1R
FZF105 104.8(41/8) 31.8(11/4) NC31B×27/8REGB 1F-2R
FZF127 127(5) 50.8(2) 31/2REGB×NC38B 2F-3R
FZF178 178(7) 71.4(213/16) 41/2REGB×NC50B 4R
FZF165 165(61/2) 71.4(213/16) NC50(B×P) 5R
FZF203 203(8) 71.4(213/16) 65/8REGB×65/8REGB 5F-6R
FZF229/FZF241 229(9)/241(91/2) 76.2(3) 75/8REGB×75/8REGB 5F-6R

Float Valve Sub

Model OD OAL ID BoxConn. OtherConnections
mm(inch) mm(inch) mm(inch) Conn. BoreDepth
mm(inch)
Conn. BoreDepth
mm(inch)
1R 42.1(121/32) 149.2(57/8) 42.9(11/16) 23/8REG 231.8(91/8) NC23 231.8(91/8)
1F-2R 48.4(129/32) 158.8(61/4) 49.21(115/16) 27/8REG 254(10) NC26 241.3(91/2)
2F-3R 61.1(213/32) 165.1(61/2) 61.9(27/16) 31/2REG 266.7(101/2) NC31 260.35(101/4)
3F 71.4(213/16) 254(10) 72.2(227/32) / / 31/2FH 355.6(14)
31/2F 79.4(31/8) 254(10) 80.2(35/32) / / NC38 362(141/4)
4R 88.1(315/32) 211.1(85/16) 88.9(31/2) 41/2REG 325.4(1213/16) NC44 331.8(131/16)
4F 92.8(321/32) 304.8(12) 93.7(311/16) / / NC46 425.4(163/4)
5R 98.4(37/8) 247.6(93/4) 99.2(329/32) 51/2REG 374.6(143/4) NC50 368.3(141/2)
5F-6R 121.4(425/32) 298.4(113/4) 122.2(413/16) 75/8REG 438.2(171/4) 51/2FH 431.8(17)

Float Valve

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