Venturi based steam traps has superior characteristic over mechanical steam traps, with no moving parts venturi based steam trap will not fail as regularly found in mechanical stream traps. Venturi based steam traps have been installed in many industrial settings and by the US Navy steam-powered fleet for over thirty years. As with most technologies, there are always opportunities for improvement.
All SMART Venturi Steam Traps are supplied with a 20-year mechanical and performance guarantee, and, since stainless steel is used throughout, the expected lifetime of the trap is 20-30 years.
How does it works?
Venturi steam trap working principle bases on two parts. First, venturi effect in pipe tube controlled by the diameter of the condensate removal channel. Second, a portion of the capacity is controlled by the back pressure that is generated inside the Venturi insert using flash steam.
The overall capacity of the trap is comprised of two parts. First, a portion of the capacity is controlled by the diameter of the condensate removal channel. Second, a portion of the capacity is controlled by the back pressure that is generated inside the Venturi insert using flash steam.
The replaceable insert has a reverse cone-shaped opening at the top leading to the Venturi section where the self-regulation process occurs based upon the physics of pressure change, a change in density, and energy conservation.
As the higher-pressure condensate enters the Venturi section, a small portion turns into flash steam and creates a barrier to the live steam. The flash steam is generated by the combination of the pressure drop across the channel and the difference in the density of the steam compared to the condensate.
The higher the pressure differential across the trap, the more condensate is converted to flash steam. The combination of the channel diameter and the production of flash steam give the Venturi trap its overall capacity and ability to handle varying condensate loads.
The capacity of our Venturi Trap is a function of the insert channel diameter and the dimensions of the Venturi section. By utilizing the natural laws of physics, the change in the amount flash steam with the change in pressure, the capacity of the Venturi Steam Trap can adjust with the changes in process conditions. All our condensate removal valves utilize a custom modified Venturi Nozzle to separate the steam from the condensate.
- The density of condensate is about 1,000 times greater than that of steam.
- From the basic physics of a two-phase flow, we know that the heavier condensate phase will preferentially pass through the nozzle as compared to the lower density steam.
- In a saturated steam system, a steam and condensate mixture is present at all times.
- There is always a condensate seal at the inlet of the Venturi nozzle that holds back the live steam, and condensate is discharged preferentially through the nozzle.
- For varying load applications, the regulation of the capacity in a Venturi nozzle is achieved by the generation of flash steam, as the hot condensate passes through the nozzle.
- Flash steam is formed in the Venturi due to the pressure drop between the inlet and the outlet of the Venturi neck.
- As the pressure of the condensate is reduced, it contains less energy. However, since energy cannot be destroyed, the difference causes some of the condensate to be converted into “flash” steam, which blocks any flow of live steam.