Standard orifice plate integrated throttling device

Standard orifice plate integrated throttling device

1. Purpose: The throttling differential pressure flowmeter consists of three parts: throttling device, differential pressure transmitter, and flow accumulator. The throttling device is a primary element directly installed on the pipeline, and the differential pressure transmitter and integrator are secondary elements. It is mainly used for the flow of various gases (pure or dusty), steam (saturated or superheated), and liquids (conductive or non-conductive; highly corrosive; viscous or containing tiny particles of dirt) through pipelines. It can directly measure volumetric flow rate or mass flow rate.

2. Differential pressure flowmeter（standardOrifice plate)The conditions for useCharacteristics and Scope of Application

a、Terms of Use：

1) In the measurement section,The fluid must fill the circular tube continuously and continuouslylandFlow through the throttling device;

2)The fluid must be a homogeneous single-phase fluid both physically and thermodynamically;

3)The fluid measured by the throttling device must be a stable flow, or can be regarded as a stable slowly changing fluid, and is not suitable for pulsating flow and critical flow measurement;

b、 Characteristics and scope of application:

1) The standard throttling device does not require real flow calibration to ensure its measurement accuracy.

2) It is widely applicable to the measured medium and can be used for flow measurement of almost all gases, vapors, and liquids;

3) Applicable diameter ratio β is 0.22-0.75, Reynolds number ReD ≥ 5000, pipeline diameter DN50~1000mm, allowing extrapolation to 5000mm. β=d/D, d - orifice plate opening diameter; D - Actual inner diameter of pipeline

4) The pressure can reach up to 32MPa and can also be used for negative pressure;

5) Medium temperature range: -30 ℃ to+650 ℃;

6) The intelligent differential pressure flowmeter adopts an intelligent differential pressure transmitter, which can set the differential pressure value (within the specified range) on site through buttons or communication methods according to the changes in the flow rate of the measured object, thereby changing the flow range and greatly expanding the system flow range;

7) No movable parts, the mechanism is safe and reliable, easy to use and operate, easy to master, and maintenance free;

According to the national standards of the People's Republic of ChinaGB/T2624-93 and international standard ISO5167-1 stipulate that the flow range ratio applicable to throttling devices is 3 (i.e. the ratio of maximum and minimum applicable flow rates), and in some cases, a range ratio of 4 is allowed. If the range ratio is greater than the above value, the measurement error at low flow rates using the same differential pressure meter will be significant

Standard orifice plate integrated throttling device

The integrated throttling device is assembled by the flowmeter manufacturer according to the user's requirements, including the throttling device, globe valve, condenser (or condensing ring), impulse pipe, three valve group, and differential pressure transmitter. Simply weld the flange to the pipeline and connect it to the differential pressure transmitter cable upon arrival to put it into use.

In recent years, integrated throttling devices have been popular in the market due to their great convenience to users, resulting in various structural forms. Due to space limitations, only one integrated throttling device designed and produced by our company is introduced as follows, and its structure and composition diagram are shown in the figure9.