© Contents copyrighted R. Darsey 8/2007

Product Summary

· 1/4”-6 Line Sizes

· Low Unrecoverable Pressure loss

· Suitable for High Pressure

· Corrosive  / Caustic Application

· Cryogenics or High Temperature

Product Detail– Venturi Elements

Venturi Flow Elements

Advancing Flow Measurement

Technology

 

As the process approaches the contracted portion (throat) of the venturi flowmeter, the velocity of the process must increase as it flows through the contracted  zone (throat). The angle of approach is such that no turbulence is introduced into the stream.  A pressure tap is located at the side wall in the pipe ahead of the meter, and another one is located at the throat. The increase in velocity of the process through the throat results in a lower pressure at the throat. The flow rate is proportional to the difference in pressure between the two taps. The gradual tapering of the meter walls back to pipe size downstream of the throat allows the process to slow down with a minimum of lost energy. This allows a recovery of nearly 99 percent of the pressure on the approach side. To monitor the amount of flow through the venturi flowmeter, a differential pressure gage is used to monitor the pressure difference between the two pressure taps.