Flow Nozzles

Product Detail– Flow Nozzles

Flow Nozzles

A flow nozzle consists of a restriction with an elliptical contour approach section that terminates in a cylindrical throat section. Pressure drop between the locations one pipe diameter upstream and one-half pipe diameter downstream is measured. Flow nozzles provide an intermediate pressure drop between orifice plates and venturi tubes; also, they are applicable to some slurry systems.

The "TAPPED" TYPE FLANGED FLOW NOZZLE is similar to the "FLANGE" style, but includes a downstream tap (usually a 1/2" connection) provided in the flange of the nozzle. This style nozzle is recommended in smaller line sizes where the downstream tap may interfere with the pipe weld or downstream mounting flange.

The "WELD-IN" FLOW NOZZLE style is designed to be installed permanently in a pipe section. This nozzle has a specially machined step on its outside diameter that is used to align a beveled inlet and outlet bored pipe section. This type nozzle is widely used where high temperature and pressure applications. prohibit the use of pipe flanges such as in power plant and feed water installations. Pipe wall taps are utilized with this style.

The "STANDARD" FLANGE FLOW NOZZLE style is the most

commonly used Flow Nozzle. It is designed to be inserted between pipe flanges. A special machined shoulder on the back side of the flange assures the proper alignment of the nozzle with the pipe I.D. This style Flow Nozzle utilizes pipe wall taps whose location is

determined by the Beta Ratio.

The "HOLDING RING" FLOW NOZZLE style is designed so that the welding of dissimilar materials is eliminated, A special holding ring and locating pins are made of the same material as the pipe that the nozzle Is to be installed in. This allows for the nozzle to be offered in a wide range of materials. This style is not recommended for line sizes below 4 Inches.

Advancing Flow Measurement

Technology

Product summary

· The flow nozzle is recommended for both clean and dirty liquids

· The rangeability is 4 to 1

· The relative pressure loss is medium

· Typical accuracy is 1-2% of full range

· Required upstream pipe length is 10 to 30 diameters

· The viscosity effect high