VENTURI TUBES

Venturi tubes have the advantage of being able to handle large flow volumes at low pressure drops. A venturi tube is essentially a section of pipe with a tapered entrance and a straight throat. As liquid passes through the throat, its velocity increases, causing a pressure differential between the inlet and outlet regions.

Venturi tubes are characterized by several outstanding features. They have the same capacity as flow nozzles, wich is about 60% greater than that of orifice plates for the same operating differential and orifice to pipe ratio. Permanent pressure loss is very low ranging from 10 to 20% of the differential and Reynolds number variations have a much slighter effect on Venturi tubes than on flow nozzles or orifice plates. Their use is recommended in those applications where low line pressure loss is at premium and when long lasting equipment and stable flow coefficients are desired.

Venturi tubes features

Manufacturing according to

Materials
  • ISO R 541
  • UNI 2234
  • DIN 1952
  • BS 1042
  • AFNOR NF X 10-102, ...
  • Carbon steel
  • Stainless steel
  • Other materials on request

TYPE SELECTION

  • Long Venturi-Outlet angle 5° - Permanent pressure loss about 10% (Herschel type Venturi Tubes)
  • Short Venturi-Outlet angle 15° - Permanent pressure loss about 15% (Herschel type Venturi Tubes)
  • Extra short Venturi-Outlet angle 21° - Permanent pressure loss about 20% (Herschel type Venturi Tubes)

  • Long Venturi-Outlet angle 5° - Permanent pressure loss about 18% (ISA 1932 Venturi Tubes)
  • Short Venturi-Outlet angle 15° - Permanent pressure loss about 23% (ISA 1932 Venturi Tubes)
  • Extra short Venturi-Outlet angle 21° - Permanent pressure loss about 28% (ISA 1932 Venturi Tubes)