Kelly Valve/Cock

Main Technical Features
● Kelly valve also named Kelly cock or drill pipe safety valve. It is a hand control valve in drill

string circulating system and it is one of the effective tools to prevent blowout.

● Kelly valve is divided into Upper Kelly Valve and Lower Kelly Valve. Upper Kelly Valve is

connected between swivel sub and Kelly. Lower Kelly valve is connected between lower end of

Kelly and top of drill pipe or lower end of Kelly save sub. Rotating the wrench of full opening

safety valve 90° to realize on and off. In the drilling operation, in order to avoid malignant

accidents, Kelly valves should be connected to both end of Kelly to prevent loss of drilling fluid

and blowout.

● H2S Resistance Kelly valves is also available upon request

Type	Outer Diameter Mm(inch)	Connecting thread API	Inner Diameter Mm(inch)	Working Pressure MPa
XS86	86(3-3/8)	NC26	30(1-3/16)	35-70
XS105	105(4-1/8)	NC31	40(1-37/64)	35-70
XS111	111(4-3/8)	NC31	40(1-37/64)	35-70
XS121	121(4-3/4)	NC38	44.5(1 3/4)	35-70
XS127	127(5)	NC38	44.5(1 3/4)	35-70
XS146	146(5-3/4)	4-1/2REG LH	44.5(1 3/4)	35-70
XS159	159(6-1/4)	NC46	57.2(2 1/4	35-70
XS168	168(6-5/8)	NC50	71.4(2-13/16)	35-70
XS178	178(7)	5-1/2FH	71.4(2-13/16)	35-70
XS197	197(7-3/4)	6-5/8REG LH	76.2(3)	35-70
XS203	203(8)	6-5/8REG LH	76.2(3)	35-70