# JC020 Orifice Plate Throttle Flow Transmitter

JC020 Orifice Plate Throttle Flow Transmitter is the most historic and most extensively used flow measurement instrument. Its features are simple structure, easy installation, stable performance and high accuracy, etc merits. It can be used for flow measurement for liquid, steam and gas in modern industries.

JC020 Orifice Plate Throttle Flow Transmitter

Throttle device is the most historic and most extensively used flow measurement instrument. Its features are simple structure, easy installation, stable performance and high accuracy, etc merits. It can be used for flow measurement for liquid, steam and gas in modern industries. There are many kinds of throttle devices with a whole variety (being conformability with Standard GB/T2624-2006, Standard ISO5167-1-20031, Standard BS1042-1989 and Standard ASME) that are manufactured with advanced calculation methods and precise manufacturing means. They are applied extensively in petroleum, chemical, power, light industry, water supply field, gas transmission field etc.

### Principle of operation

A throttle element (like throttle orifice, throttle nozzle, etc) is installed in a pipe that is full of one way flowing continuous fluid. When the fluid passes the throttling orifice of the throttling element, the fluid stream forms local shrink. Then the velocity increases, so does the kinetic energy, the static pressure decreases. So, there is a differential static pressure from the fore and the rear of the throttle element, i.e. △P=P1-P2. If the area of the throttle orifice is F, the mass flow of the fluid is qm, the volume flow is qv the density is ρ, then according to the flow continuity law and Bernoulli equation, the following mathematical relations between differential pressure and fluid flow can be derived:

“α” is flow coefficient. According to the above equation, if the area of the throttle orifice and fluid density are constant, flow has direct ratio with square root of differential pressure. That is to say, if you have the differential pressure value, then you can calculate the flow value. Throttle device can measuring fluid flow just according to this principle.

BCST are the professional manufacturer flow measurment

Technical Parameter for JC020 Orifice Plate Throttle Flow Transmitter

Technical Parameter

1. Nominal Diameter: 15 mm ≤DN≤1200mm
2. Nominal Pressure: PN≤10MPa
3. Working temperature :－50℃≤t≤550℃
4.Turn-Down ：1:10， 1:15
5. Accuracy ：0.5%，1%

Characteristic

1.Easy structure , stable and long life , low cost
2. Orifice calculation is adopted international standard
3.Wide Application , full single-phase flow and part mixed-phase flow can be applied .

4.Standard orifice don’t need calibrate and can be applied

5.Completed integral orifice plate is easy for installation , it can directly Connect to differential pressure transmitter and pressure transmitter without pressure connecting pipe .

6. It can be used for high temperature more than 200 °C

7. High Stability is better than 0.1%FS/ year

8. High Static pressure :40MPa

9.don’t affect by temperature and static pressure ，Resistance to high over pressure

10.Continuous wokring 5 years without any calibration

BCST are the professional manufacturer flow measurment

Table 1 Throttling element code and meaning
 Code Meaning Code Meaning Y Standard orifice plate I Eccentric orifice plate Q 1/4 circle orifice plate S Segmental orifice plate X Small caliber orifice plate Z Raw cast contracted section (throat) Classic Wenturi Tube T Taper inlet orifice plate J Machined contracted section (throat) Classic Wenturi Tube M ISA1932 ejection nozzle H Iron plate welded contracted section (throat) Classic Wenturi Tube C Major diameter ejection nozzle W Wenturi ejection nozzle

Table 2 Pressure measuring code and meaning

 Code F H Z D T Meaning Pressure measuring with flange Pressure measuring with angle joint ring chamber Pressure measuring with drilling hole Pressure measuring with two distanced holes Special pressure measuring

Table 3 Nominal diameter code and meaning

 Code 01 016 02 026 03 04 05 06 08 10 DN mm 10 15 20 25 32 40 50 65 80 100 in 1/2 3/4 1 1-1/4 1-1/2 2 2-1/2 3 4 Code 12 15 20 25 30 35 40 45 50 60 DN mm 125 150 200 250 300 350 400 450 500 600 in 5 6 8 10 12 14 16 18 20 24 Code 70 80 90 91 DN mm 700 800 900 1000 in 28 32 36 40

Table 4 Nominal pressure code and meaning

 Code 01 02 03 04 05 06 10 11 15 16 PN MPa 1.6 2.0 2.5 4.0 5.0 6.3 10.0 11.0 15.0 16.0 Class 150 300 600 900 Code 25 26 42 PN MPa 25.0 26.0 42.0 Class 1500 2500

Table 5 Straight pipe section code and meaning

 Code No A B C D E F Meaning Throttle element Throttle element, with flange Throttle element, with flange, with upper and lower straight pipe section Throttle element, with flange, with upper and lower straight pipe section, with upper and lower connection flange Throttle element, with flange, with upper and lower straight pipe section, with upper connection flange Throttle element, with flange, with upper and lower straight pipe section, with lower connection flange Welding structure
 Throttle Device Parameters Table Project NO. Table NO. Page.     Total. Data Calculation Operation conditions Fluid name Throttle element type Operating temperature ℃ Pressure taking type Operating pressure  MPa Select scale Flow Liquid       kg/h Max. Select differential pressure  kPa Steam       kg/h Nor. Min. flow limit Gas(standard)    Nm3/h Min. Reynolds number          Re (normal flow) Liquid           kg/m3 Area expansion correction coefficient                   Fa Steam           kg/m3 Expansion coefficient           ε Gas (standard)    kg/m3 Flow coefficient               α Uncertainty                  % Permanent pressure loss        Pa Diameter ratio                βt Hole diameter of throttle      mm element or segmental height 1/4 circle radius or eccentricity degree            mm Operating density          kg/m3 Throttle device standard Dynamic viscosity         mPa.s Kinematic viscosity        mm2/s Specification Relative humidity (Φ) Compression coefficient (Z) Model Isentropic exponent  (cp/cv) Normal diameter (DN) Allowable pressure loss        Pa Normal pressure (PN)           MPa Pipe Nominal diameter (DN) Flange standard Pipe instrument number Flange inner diameter         mm Outside diameter/inner diameter  mm Structural length              mm Material Pressure tape size             mm Pressure tape location material Throttle element Flange Bolt Nut Gasket Remark

BCST are the professional manufacturer flow measurment

JC020 Orifice Plate Throttle Flow Transmitter

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