LGK,LGX,LGQ Integrated orifice plate mass flowmeterDetailed product description：

There are several methods for using an integrated orifice mass flowmeter to measure the flow rate of media through pipelines, but the most widely used and common one is the differential pressure flowmeter. It consists of a throttling device and a differential pressure gauge, or a throttling device and a differential pressure transmitter together with a secondary gauge. The use of throttling devices has a long history and has been standardized both internationally and domestically. The throttling device is a primary component in differential pressure measurement, which is used by people to create a pressure difference in the fluid inside the pipeline. By using a pressure conduit to transmit the pressure difference generated before and after the throttling device to a differential pressure transmitter, and then inputting it into a secondary instrument, the instantaneous or cumulative flow rate of the fluid in the pipeline is displayed. The flow rate can also be adjusted using regulating instruments. The throttling device has a simple structure, accurate measurement, reliable use, and is easy to maintain and repair.

Purpose:

The LG/FB standard annular orifice plate and flange orifice plate throttling device are scale-free flow measurement devices that are used in conjunction with pneumatic, electric differential pressure transmitters or double bellows differential pressure transmitters. In the metallurgical, chemical, petroleum, and power industry systems, the pressure difference generated by the continuous measurement of liquid, gas, and steam flowing through an orifice plate with a medium temperature of ≤ 400 ℃ is converted into a proportional output signal by a transmitter. Then, a secondary instrument or regulator is used to record, indicate, or adjust the measured flow rate.

Working Principle:
The throttling device is a man-made device that causes throttling in the pipeline where the medium flows (as shown in Figure 1). After the measured medium flows through the throttling device, it causes a local contraction, concentration of the flow beam, increase in flow velocity, and decrease in static pressure, resulting in a static pressure difference between the upstream and downstream sides of the orifice plate. There is a certain functional relationship between the static pressure difference and the flow rate. The larger the flow rate, the greater the static pressure difference generated. Therefore, by measuring the differential pressure, the flow rate can be measured.

The structure of the throttling device is shown in Figures 2 and 3:

Structural features:
1. Ring chamber pressure standard orifice plate:
It belongs to the standard orifice plate. Due to the implementation of ring chamber pressure measurement, measurement accuracy has been improved and the minimum length of straight pipe segments required for installation has been shortened, making it widely applicable in various departments.
2. Standard orifice plate for pressure measurement of corner joint drilling:
It belongs to the standard orifice plate. When the pipe diameter is above 400 millimeters, this form is often used. The pressure measurement methods include drilling holes separately on the flange, using circular pressure equalization rings, or using square pressure equalization rings. The orifice plate can be in the form of a handle hole or a non-standard circular hole plate.
3. Flange pressure gauge standard orifice plate:
It belongs to the standard orifice plate. Regardless of the diameter of the pipeline, the centers of the upstream and downstream pressure tapping holes are located at 1 hour (25.5mm) each from the end faces on both sides of the orifice plate. This form is commonly used in refining systems.
4. Radial distance pressure standard orifice plate:
It belongs to the standard orifice plate. The pressure measurement method is pipeline pressure measurement. The center of the upstream pressure tapping hole is located at twice the inner diameter of the pipeline in front of the orifice plate. The center of the downstream pressure tapping hole is located at a distance of half the inner diameter of the pipe from the rear end face of the orifice plate.
5. Small caliber orifice plate:
Belongs to non-standard orifice plate. Used for measuring fluids within a diameter of 10mm to 50mm.
6. Double orifice plate:
It is composed of two standard orifice plates installed at a certain distance from each other in a straight pipe. In terms of the direction of the flow, the front orifice is referred to as the auxiliary orifice plate, while the rear orifice plate is referred to as the main orifice plate. The cross-sectional ratio m1 of the auxiliary orifice plate is greater than the cross-sectional ratio m of the main orifice plate. The two orifice plates form a nozzle with a liquid wall. It is used for flow measurement of low Reynolds number fluids or high viscosity fluids.
7. Circular perforated plate:
It belongs to non-standard orifice plates and is suitable for measuring the flow rate of fluids that are dirty, have air bubbles, or contain solid particles. Its measurement accuracy is relatively low.
8. Conical inlet orifice plate:
Belongs to non-standard orifice plate. The angle between the circular cone and the centerline is 45 °. This conical inlet orifice plate is suitable for applications with low Reynolds numbers, but the pipe size must not be less than 25 millimeters.
9. Others.

Advantages:
1) Standard orifice plate - characterized by high measurement accuracy, easy installation, wide range of use, and low cost. Widely used for flow measurement of various media.
2) Standard nozzle - characterized by high temperature and pressure resistance, impact resistance, long service life, large measurement range, and high measurement accuracy. Suitable for measuring high temperature and high pressure steam flow in power plants, heating network pipelines, and fluid flow with high flow rates. There are two forms: A: ISA1932 nozzle (standard nozzle) B: long neck nozzle.
3) Classic Venturi nozzle - characterized by low pressure loss, high measurement accuracy, short front and rear straight pipe length, and long service life.
4) Wing wind measurement device - characterized by low pressure loss, short front and rear straight pipes, and stable measurement.
5) Double Venturi tube - characterized by low pressure loss and stable measurement, suitable for measuring air volume in circular or rectangular pipelines. Specification: DN80-4000mm (or length x width).
6) Circular orifice plate, circular orifice plate, eccentric orifice plate - have the characteristics of being less prone to blockage and having shorter front and rear straight pipes. Suitable for measuring gases and liquids containing powder and impurities such as blast furnace gas and coke oven coal.
7) Double orifice plate 1/4 circular nozzle - widely used for flow measurement of various liquids and gases with low flow rates under low Reynolds number conditions.
8) Anuba flowmeter - characterized by low pressure loss and easy installation. Suitable for flow measurement of circular and rectangular pipelines.
9) Limiting orifice plate - has the characteristics of limiting current and reducing pressure. Suitable for limiting flow or reducing pressure.
10) Single and double chamber balanced containers - suitable for liquid level and steam drum water level.

Technical Specifications:

serial number	name	model	Nominal diameter Dg (mm)	Nominal pressure Pg (kg/c)	Remark
one	Pressure measurement of corner joint chamber Standard orifice plate	LGK-H-10 LGK-H-25 LGK-H-64 LGK-H-100	50-400 50-400 50-400 50-400	ten twenty-five sixty-four one hundred	1. The following flange standards can be provided according to user needs (1) Ministry of Chemical Industry Standard HG5010-5016-58 (2) Standard JB78-82-59 of the First Machine Department (3) Standard of the Ministry of Water and Electricity (4) Process according to user drawings. 2. The orifice plate material is generally stainless steel.
two	Separate drilling and pressure measurement for corner joints Standard orifice plate	LGK-E-6 LGK-E-10 LGK-E-16 LGK-E-25	400-2000 400-2000 400-2000 400-2000	six ten sixteen twenty-five
three	Flange pressure measurement Standard orifice plate	LGK-F-10 LGK-F-25 LGK-F-64 LGK-F-100	50-750 50-750 50-750 50-750	ten twenty-five sixty-four one hundred
four	Radial pressure measurement Standard orifice plate	LGK-J-6 LGK-J-25 LGK-J-64 LGK-J-100	50-2000 50-2000 50-1000 50-600	six twenty-five sixty-four one hundred
five	Small caliber orifice plate	LGX-25 LGX-64	10-50 10-50	twenty-five sixty-four
six	Circular perforated plate	LGQ-6 LGQ-16	50-2000 50-1600	six sixteen

LGK, LGX, LGQ integrated orifice plate mass flowmeter