Kelly check valve is a constant-open type blowout protection assembly in drilling tool, as well kick happens, it can be closed and prevent fluid under ground from gushing up through the water hole in drilling column. In well control operation, if hose and high-pressure manifold is damaged , is can be replaced in safety under the valve being closes.

Upper plug valve adopts left hand thread but the lower adopts right hand thread , and they are identical in structure of ball valve.

Feature

Upper plug valve consists of valve body, upper/lower seat, ball body. Rotary-block, retainer, spring and non-metal seals etc.

Valve seat and ball body are made of heat-resistant stainless steel with abrasion and corrosion resistance.

The valve is single direction seal, as the valve is closed, under the co-reaction of fluid pressure under well and pre-load quickly so as to create a seal . As for the sealing face of back-seat adds a PTFE nonmetal ring and reduce the compact of ball body to valve seat, So that it should have more reliable performance.

The surface of the valve body stamped with visible sign of “open” or “close” indicates the open/close station of check valve obviously