drop-in check valve is an internal preventer. when blowout is going to happen , the kelly should be removed immediately and the check pressure valve assembly should be put into the water hole and then…
the quick-operating thread protector is a manually-operated device for protecting external pin-end threads on casing. it is simple, tough and secure, the fast and easy operation of quick-operating thr…
arrow type check valve used to be installed between drill stem and bit to prevent drilling fluid backflow from the bottom. the body is a crossover sub in which the other parts are installed. when back…
this float valve is normally installed in a standard bore-back of the bit sub, to provide fluid flow control at the bottom of the drill stem. it also prevents backflow of cuttings from plugging the dr…
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 drill pipe safety valve or upper kelly valve to cont…
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