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Method and apparatus for controlling a surging flow in a closed conduit
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Pneumatic apparatus for measuring rate of movement
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Apparatus for eliminating differential pressure surges
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Apparatus for pneumatically monitoring conditions of a well circulating system
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Method and apparatus for detecting potentially dangerous conditions in a well bore during trips of the well string in and out of the well bore
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Pneumatic measurement apparatus
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Method and apparatus for sensing downhole well conditions in a wellbore
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Apparatus for controlling fluid flow through a conduit
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Apparatus for measuring liquid density
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Closure member and apparatus for controlling fluid flow through a conduit
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Bottom-hole pressure regulation apparatus
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Apparatus and method for automatically controlling fluid pressure in a well bore
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