方鉆桿旋塞閥

Kelly Valve(Kelly Cock)

方鉆桿旋塞閥是鉆柱循環系統中的手動控制閥，是防止井噴的有效工具之一．方鉆桿旋塞閥分上部方鉆桿旋塞閥和下部方鉆桿旋塞閥。上部方鉆桿旋塞閥連接于水龍頭下端和方鉆桿上端之間下部方鉆桿旋塞閥連接于方鉆桿下端和鉆桿上端或方鉆桿保護接頭的下端之間方鉆桿旋塞閥操作非常簡單，用專用扳手按指示要求轉動90度即可實現開或關。在鉆井作業中，應在方鉆桿上、下兩端組接方鉆桿旋塞閥

Kelly valve is a manually operated ball type drill stem valve; it is divided into upper Kelly valve and lower Kelly valve. The upper Kelly valve is connected between lower end of swivel and upper end of Kelly; the lower Kelly valve is connected between upper end of drill pipe and lower end of Kelly or connected between lower end of Kelly saver subs. The Kelly valve can be opened on or closed off by only turning the special operating wrench at 90° according to indicating direction. During drilling operation, the Kelly valve shall be connected at upper end and lower end of Kelly