Venturi Nozzle Venturi Nozzle

Product Overview

Venturi Nozzle

DHOV-N-TMDHOV-N-TFDHOV-N-BWDHOV-N-FL

The venturi nozzle is axisymmetric in profile and consists of a convergent section with a rounded profile, a cylindrical throat (throat) and a divergent section. The upstream face is identical to the ISA 1932 nozzle. The throat consists of a section E of length 0.3d, the same as the ISA 1932 nozzle, and a section E′ of length 0.4d ~ 0.45d.

The throat diameter d is the mean of at least four diameter measurements distributed at approximately equal angles in axial planes. The throat must be cylindrical, and no diameter in any cross-section may deviate from the mean diameter by more than 0.05%. The divergent section joins section E of the throat without rounding, but burrs (burr) are removed.

The included angle Φ of the divergent section is 30° or less, and the venturi nozzle may be truncated (truncate) in the same way as the classical venturi tube.

0.5B ~ 120B (15A ~ 3000A)ANSI 150 ~ 1500LBAccuracy ±2.0%ISO 5167-3

English description

The profile of the Venturi nozzle is axisymmetric. It consists of a convergent section, with a rounded profile, a cylindrical throat and a divergent. The upstream face is identical with that of an ISA 1932 nozzle. The Throat consists of a part E of length 0.3d which is the same as for the ISA 1932 nozzle and a part E' of a length 0.4d to 0.45d. The value d of the diameter of the throat shall be taken as the mean of measurements of at least four diameters distributed in axial planes and at approximately equal angles to each other. The throat shall be cylindrical. No diameter of any cross-section shall differ by more than 0.05% from the value of the mean diameter. This requirement is considered as satisfied when the deviations in the length of any of the measured diameters comply with the said requirement in respect of deviation from the mean. The divergent section shall be connected with the part E of the throat without a rounded part, but any burrs shall be removed. The included angle of the divergent section, Φ, shall be less than or equal to 30°. The Venturi nozzle may be truncated in the same way as the classical venturi tube.

Measurement principle

Differential-pressure structure and flow relationship

Types · model configuration

Specification comparison by model

Item	DHOV-N-TM Male threaded connection	DHOV-N-TF Female threaded connection	DHOV-N-BW Butt weld connection	DHOV-N-FL Flanged connection
Features	Male screw mounting type (Threaded type, FIG 5)	Female screw mounting type (Threaded type, FIG 5)	Butt welding mounting type (Butt weld type, FIG 6)	Flange mounting type (Flanged type, FIG 7)
Turndown	6:1	6:1	6:1	6:1
Materials	Carbon Steel, STS304, STS316, Inconel, Monel, Hastelloy	Carbon Steel, STS304, STS316, Inconel, Monel, Hastelloy	Carbon Steel, STS304, STS316, Inconel, Monel, Hastelloy	Carbon Steel, STS304, STS316, Inconel, Monel, Hastelloy
Connection	Screw 1/2B ~ 2B (15A ~ 50A)	Screw 1/2B ~ 2B (15A ~ 50A)	Butt Weld	Flange 150#, 300#, 600#, 900#, 1500#, 2500#
Applicable piping	1/2B ~ 2B (15A ~ 50A) Pipe	1/2B ~ 2B (15A ~ 50A) Pipe	2B ~ 120B (50A ~ 3000A) Pipe	2B ~ 120B (50A ~ 3000A) Pipe
Standards	ISO5167-3	ISO5167-3	ISO5167-3	ISO5167-3
Accuracy	±2.0%	±2.0%	±2.0%	±2.0%

Technical Specifications

Detailed conditions are confirmed at quotation.

Standards

• ISO 5167-3
• ISO 5167
• JIS Z 8762
• ASME
• KS A 0612

Dimensions · drawings

Unit: mm. Actual manufacturing dimensions are based on the approved drawing.

Venturi nozzle required straight run (multiples of D)

Columns 2 ~ 11 are the upstream (inlet) side and column 12 is the downstream (outlet) side straight run. Values without parentheses are 'zero additional uncertainty' values; values in parentheses are '0.5% additional uncertainty' values. The minimum required straight run is the length between each upstream/downstream fitting and the primary element, and all straight lengths are measured from the upstream face of the primary element. The installation of thermometer pockets or wells does not alter the minimum upstream straight run required for other fittings.

Installation requirements

Straight run and installation notes

• The required straight run follows the table above according to β and the type of upstream fitting, and all straight lengths are measured from the upstream face of the primary element.
• The installation of thermometer pockets or wells does not alter the minimum upstream straight run required for other fittings.
• Small sizes (1/2B ~ 2B) are supplied with threaded connections (TM/TF); 2B and above as butt weld (BW) or flanged (FL) type.

Ordering information (How to Order)

You can request a quotation by combining the model codes.

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