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CONTACT
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HOME
-
ABOUT
-
PRODUCTS
- DRILLING TOOLS
- DRILLING MOTORS
- STABILIZERS
- DRILL COLLARS
- DRILLING JARS
- HYDRAULIC AGITATOR
- ANTI STICK-SLIP TOOL
- MULTIPLE ACTIVATION BYPASS VALVE
- DRILL PIPES
- NON-ROTATING PROTECTOR
- X-OVER & SUBS
- DRILL BITS
- MICRO REAMER
- FISHING TOOLS
- RELEASING SPEAR
- RELEASING AND CIRCULATING OVERSHOT
- REVERSE CIRCULATION JUNK BASKET
- JUNK SUB
- FISHING MAGNET
- SAFETY JOINT
- TAPER TAP
- DIE COLLAR
- IMPRESSION BLOCK
- DITCH MAGNET
- MILLING SHOES
- WASHOVER PIPE
- IBOPs
- KELLY VALVE
- FLOAT VALVE
- FULL OPENING SAFETY VALVE
- TOP DRIVE IBOP
- INSIDE BOP
- DROP-IN CHECK VALVE
- WELLBORE CLEANING TOOLS
- CASING SCRAPER
- NON-ROTARY CASING SCRAPER
- CASING BRUSH
- CUTTING BED IMPELLER
- STRING MAGNET
- ROTARY CASING GUIDER
- CASING CUTTER
- SECTION MILL
- WELLHEAD TOOLS
- ELEVATORS
- ELEVATOR LINKS
- POWER TONGS
- MANUAL TONGS
- SLIPS
- SPIDERS
- SPINNING WRENCH
- BUSHINGS
- DRILLING EQUIPMENTS
- MUD PUMP
- VALVE SEAT AND BODY
- PISTON
- CYLINDER LINER
- HYDRAULIC BUCKING UNIT
- JAR TESTER
- FRAC PUMP VALVE RUBBER
- FRAC PUMP VALVE BODY
- FRAC PUMP VALVE SEAT
- FRAC PUMP PLUNGER PACKING
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PRESS
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改logo产品图-kellyvalve
Kelly Cock Valve
Kelly valve also named kelly cock or drill pipe safety valve, which is located within the drill string that allow for free-passage of drilling fluid without pressure loss. It is a hand control valve in drill string circulating system and it is one of the effective tools to prevent blowout.
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Kelly valve is specifically designed for effective control of blow outs and/or mud loss control. It can be divided into upper kelly cock valve and lower kelly cock valve. The upper kelly cock is connected between lower end of swivel and upper end of kelly; the lower kelly valve is connected between lower end of kelly saver sub. 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, both upper and lower Kelly cocks should be connected to prevent accident during drilling operation.The sealing principle for Kelly valve is that the ball is positioned and provided with proceeding stress by the lower seat supported by spring load and a close seal between ball and ball seat is provided. During normal drilling operation, the hole is kept unblocked by turning the stem to be "on" position; In case of kick or blowout, turn the operating stem to be "off" position to close off the internal bore of drill string, the kick or blowout accident is avoided due to a high pressure sealing situation between ball and ball seat.
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