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.
- Introduction
- Parameters
- Model
- How to Order
- Video
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
| 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
