Lower kelly valve:

Terms Related to Lower kelly valve

• Drill stem safety valve

  A special valve installed below the kelly. Usually, the valve is open so that drilling fluid can flow out of the kelly and down the ...

• Upper kelly cock

  A valve installed above the kelly that can be closed manually to protect the rotary hose from high pressure that may exist in the drill ...

• Lost returns

  See lost circulation. Lower kelly cock n: see drill stem safety valve

• Standing valve

  A fixed ball-and-seat valve at the lower end of the working barrel of a sucker rod pump. The standing valve and its cage do not ...

• Kelly bushing

  A special device that, when fitted in to the master bushing, transmits torque to the kelly and simultaneously permits vertical movement of the kelly to ...

• Valve

  A device used to control the rate of flow in a line to open or shut off a line completely, or to serve as an ...

• Safety valve

  1. An automatic valve that opens or closes when an abnormal condition occurs (e.g., a pressure relief valve on a separator that opens if the ...