Introduction

HVT Series has been designed to gain the best performance for flow measurement on the basis of rich experience through the designing of several differential pressure flow meters in compliance with the standard of ISO 5167.

A lot of manufacturers are producing the venturi tube but HITROL is continuously supplying this flow element with high quality on the basis of the continuous R&D and technical innovation through the improvement of the technic for flow measurement.

HVT Series is a venturi tube flow element which measures a differential pressure occurred by a reducing of cross sectional area between inlet and throat section and it secures a stable discharge coefficient.

Calibration

■ Discharge Coefficient (C)

HVT Series can obtain an accuracy of ±0.5% ~ ±1.0% by performing of calibration in liquid flow calibration system.

As below graph, the discharge coefficient of flow element can be stably measured at any pipe Reynolds number greater than 75,000.

Specification

Design and Manufacturing Standard

Hitrol is designing and manufacturing the Venturi Tube in full compliance with standards of ISO 5167 and ASME MFC-3.

Fabricated Venturi Type Available in size between 3" and 144"
Machined Screw Type Available in size  4" and smaller
Machined Weld-on Type Available in size 6" and smaller
Machined Flange Type Available in size 6" and smaller

No Effect by Downstream Disturbers

HVT Series is not affected on the basic measurement accuracy by any disturbers such as elbow, tee's, valves, increasers and reducer that are installed on downstream. However, measurement accuracy of other flow elements is more affected by these disturbers on downstream than HVT Series.

Effect by Upstream Disturbers

Effect on the measurement accuracy by various upstream disturbers is well known and is as below graph.

■ General effect by disturbers.

ISO 5167

Required Straight Pipe Length

■ Values expressed as multiples of internal diameter, D

Pressure Taps Orientation

Dimension Table for Water Measurement (For Reference)

The following data is for reference only. HVT Series can measure flow rate of gas, liquid and steam in a wide range of pipe line size and beta Ratio. Contact HITROL for more information.

■ The data contained in this chart is based on reference values of 68℉(20℃) Water Producing 100inches (2540mm) of differential pressure.

Dimension Table for Water Measurement (For Reference)

■ The data contained in this chart is based on reference values of 68℉(20℃) Water Producing 100inches (2540mm) of differential pressure.