Venturis are built in thermoplastics (PVC, PE, PVDF), stainless steel or other metals. They operate effectively over a wide range of pressures (from 1 to 250 psi) and require only a minimum pressure difference to initiate the vacuum at the suction part.
Venturi injectors have no moving parts and are maintenance free. The newest injectors design causes complete mixing of injected materials (air, ozone or chemicals), eliminating the need for other in-line mixers.
This technique is used for ozone injection in water. At the end of the system a mixture of gas and liquid appears and the pressure rise again to its normal level in the pipe. Then the mixture enters the second venturi and slow down. A pump forces the liquid flow through a tube connected to:Ī venturi to increase the speed of the fluid (restriction of the pipe diameter)Ī short piece of tube connected to the gas sourceĪ second venturi that decrease the speed of the fluid (the pipe diameter increase again)Īfter the first venturi the pressure in the pipe is lower, so the gas is sucked in the pipe. Venturi are used to measure the speed of a fluid, by measuring the pressure changes from one point to another along the venture.Ī venturi can also be used to inject a liquid or a gas into another liquid. As the fluid leave the constriction, its pressure increase back to the ambient or pipe level. In the restriction the fluid must increase its velocity reducing its pressure and producing a partial vacuum. A Venturi is a system for speeding the flow of the fluid, by constricting it in a cone shape tube. Its formulation in the simplistic hypothesis of incompressible flow (fluid motion with negligible changes in density) is:Īs a consequence of this law a fluid passing through smoothly varying constrictions is subjected to changes in velocity and pressure.
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