Eductors / Venturis

Where there is no site vacuum present on site, CRP can supply sampling systems that use compressed gas to power a a venturi to 
create a vacuum within the vessel sampler sightglass chamber to draw a sample up through the dip pipe from the vessel. 

Venturis are named after the Italian physicist Giovanni Battista Venturi (1746-1822) who discovered that passing a fluid through a tube with a constricted throat brought about an increase in velocity through the restriction with a consequent drop in pressure at the entrance to the throat.

This principle is used in modern day eductors, the pressure drop being so much as to create a vacuum, depending on eductor choice this vacuum created can be surprisingly high, drawing a column of water 5m high is not uncommon.

CRP use eductors on vessel samplers when a vacuum service is not available, they are connected directly to the top manifold of the sampler. The compressed gas is controlled with a ½"NB ball valve mounted rigidly to a stainless steel bracket. The exhaust gas can be vented to a scrubber system or piped back into the vessel if required. 

For further information please contact our sales office on 01706 756 400 or

Contact Details

Corrosion Resistant Products Ltd
Todmorden Road
OL15 9EG

Phone: +44(0)1706 756400
Fax: +44(0)1706 379567