Kelly Valve also named Kelly Cock/Drill Pipe Safety Valve allowing free passage of drilling fluid without pressure loss. The valve can be used as a dill pipe safety valve or upper kelly valve to control blowout pressures, or as a lower Kelly Valve to prevent loss of drilling fluid when the kelly is disconnected.
The body of the kelly valve is made of a single piece of forged AISI 4145H(40CrMnMo) modified alloy steel, fully heat treated to 285-341 Brinell hardness and 40 ft×Ib (54J) minimum impact strength. The main components and the inside of body are chrome-plated. The kelly valve seals in both directions with metal to metal seals, available in 5,000psi (35Mpa)/10,000psi (70Mpa)/15,000psi (105Mpa) working pressure. The valve uses a hexagon socket on the operating stem and has positive stops in the open and closed positions. The design of the body limits the plug rotation to 90°, between the open and closed positions.
|
O.D |
I.D |
Box |
Pin |
AII Lengh |
|
8＂(203) |
2 15/16＂(74) |
6 5/8REG-left（LH） |
6 5/8REG- left（LH） |
22 5/16＂（566.3） |
|
7 3/4＂(196.8) |
3 1/16＂(78) |
6 5/8REG- left（LH） |
6 5/8REG- left（LH） |
24 11/16＂（627） |
|
7＂ (178) |
3 1/16＂(78) |
6 5/8REG- left （LH） |
6 5/8REG- left（LH） |
24 11/16＂（627） |
|
7-1/4＂(184) |
2 13/16＂(71) |
5 1/2FH |
5 1/2FH |
24 11/16＂（627） |
|
7＂ (178) |
2-9/16＂(66) |
NC50 |
NC50 |
20 15/16＂（532） |
|
6 5/8＂(168) |
2 13/16＂(71.4) |
NC50 |
NC50 |
22 5/16＂（566.3） |
|
5-5/16＂(135) |
1 3/4＂(44.5) |
NC38 |
NC38 |
18 1/2＂（470） |
|
4-3/4＂(121) |
1 3/4＂(44.5) |
NC38 |
NC38 |
17 5/8＂（448） |