Patents Assigned to CMV
  • Mud saver valve with magnetic latching
    Patent number: 7743787
    Abstract: A mud saver valve for retaining drilling fluid in the Kelly of a rotary drilling rig for insertion into a Kelly sub with an enlarged opening inside having a valve and hollow piston closing the flow in a first position and having flow through when the hollow piston is moved by flow against a spring to an open position compressing a spring to stack height, the spring being magnetized to provide magnetic latching to assist in holding the hollow piston in the open position at flow rates lower than it would otherwise be held open.
    Type: Grant
    Filed: July 9, 2007
    Date of Patent: June 29, 2010
    Assignee: CMV
    Inventor: Benton Frederick Baugh