The check valve in the normal drilling process are at the normally-on state

Including the BOP system , the check valve is actually a check valve connected between the drill collars and drill pipe . Normal drilling , the drilling fluid flows downwardly through the valve gap cycle ; when a kick or blowout occurs, the high pressure fluid flow in the reverse direction , to promote the spool piece with the base generated by the contact seal to prevent deterioration . Check valve with quick response and good sealing capacity , in the anti- kick , play a decisive role in the blowout on drilling safety plays an important guarantee. However, the check valve in the normal drilling process are often turned in , high-pressure  Instrument valve manifolds  erosion and corrosion , easy to cause valve seal failure or even completely scrapped, and the entire system within the blowout preventer , the well Dizhi return valve worst working conditions . Therefore it is  Check valve  for the check valve failure mechanisms in-depth research, analysis, in order to take  Male connector  to improve valve performance , and promote the overall level of non-return valve to a new level , which reflects its significant technical value and economic benefits. The need to study the drilling process , when faced with high-pressure formations , if there is no reliable blowout preventer system may occur . Whether drillstring outside blowout , or drill string blowout , there is the potential danger caused by catastrophic accidents , and some pretty heavy consequences .

Abnormally shut down valve, if close the program properly, it may cause water hammer due to off valve pipe rupture

With the development of urban construction and people's living standards improve, more and more long-distance water conveyance project. Long distance water conveyance and pump pressure of gravity in two ways, gravity water system does not require  Instrument valve manifolds  during normal operation is less than the hydrostatic head piezometric head, but when the pipeline gate valve is closed, the tube hydrostatic head is the largest terrain largest gap, the greater the gap, the higher the pressure pipe, when the gate valve is abnormally shut down, if the shutdown  Check valve , close the valve may cause water hammer pipe rupture, causing the drying up bridging the water hammer. Giant water hammer pressure often affects the normal operation of the pipeline and even devastating harm. So it brings water system's  Double ended cylinder  have attracted the attention of researchers home and abroad, so this study schedule for water safety significance. Gravity flow water for long distance pipeline water hammer protection systems research, there are a variety of domestic and international solutions and protective measures, including the valve as the most common pipe fittings.