Plate : Orifice Plate is most commonly used as a
primary element for flow measurement in pipe line.
Differential pressure is created when obstruction is placed
in fluid flow, which is proportional to the square root of
the flow rate. The flow measuring accuracy entirely depends
upon the quality of Orifice plate and its installation.
Orifice plates cover a wide range of application. It is a
low cost device and having long life without regular
Co-centric Orifice Plate: These are most commonly
used for flow measurement. This has special feature simple
structure, high accuracy and easy installation. These
Orifice Plates are recommended where Reynolds number range
from 10000 to 10^7.
These are used for liquid containing solid particles which
are like to sediment or for vapors likely to deposit water
condensate, this orifice plates are used with its eccentric
bore at the bottom side so that sedimentation of such
inclusions are avoided. For Gases and Vapors it may be
installed with the eccentric bore at the top side to avoid
stay of gas or vapor in its vicinity
The bore of this type of orifice plates is a semi-circle. It
used where solids are entertained in liquid or gas streams
• Quadrant Edge
The inlet edge of the bore of this orifice plate is rounded
to a quarter circle. This orifice plate is principally used
for measuring flow rates of low Reynolds number (Between
2000 to 10000)
• Restriction Orifice Plate
Plate: These Orifice Plates are used for reducing
fluid pressure. These orifice plates are slightly different
from standard orifice plates.
•Multistage Restriction Orifice Plates
Restriction Orifice Plates: These orifice plates
are used where single restriction orifice plates are not
sufficient to reduce the pressure. There are situations
where, while reducing the fluid pressure using single
restriction orifice plate it may rise the velocity above
sonic velocity which is not advisable. Therefore a series of
restriction orifice plate is used which is called as
Multi-Stage Restriction Orifice Plate.