Oil field management system

Oil well flow meter with circumferentially extending pocket

Optical flow rate measurement using unsteady pressures

Opto-electronic position sensing

Orifice fitting for a gas pressure differential-measuring system

Orifice measuring device

Orifice member, and differential-pressure flow meter and...

Orifice meter with isolation valve on the carrier

Orifice meter with isolation valve on the carrier

Orifice meter with pressure venting and equalizing safety device

Orifice meter with replacable orifice disc

Orifice meter with rotatable isolation sealing member

Orifice plate assembly

Orifice plate for metering the flow of a medium

Orifice wear compensation