Products overview: LGK series orifice meter is the standard orifice differential pressure transmitter with multiple parameters (or differential pressure transmitter, temperature transmitter and pressure transmitter) form a complete set of high contrast range pressure flow device, capable of measuring gas, steam, liquid and flow, widely used in petroleum, chemical industry, metallurgy, electricity, heating, water supply in areas such as process control and measurement. Throttle device, also known as differential pressure flowmeter, is composed of a primary test piece (throttle piece) and a secondary device (differential pressure transmitter and flow display) widely used in gas. Flow measurement of steam and liquid. It has simple structure, convenient maintenance and stable performance.
Ii. Working principle: LGK series of orifice meter is to be full of pipeline fluid, when they flow through the pipe orifice flow, the velocity will be at the throttle orifice flow forming local contraction, accelerated to flow, static pressure is reduced, so the standard orifice plate before and after the pressure drop is produced or differential pressure, the greater the flow medium traffic, the flow orifice of the greater the pressure difference before and after, So the fluid flow can be measured by measuring the pressure difference. This measurement method is based on the principles of the flow continuity equation (law of conservation of mass) and Bernoulli's equation (law of conservation of energy). Under the condition of known parameters, the flow rate can be obtained by deducing the relation between flow pressure and flow rate according to flow continuity principle and Bernoulli equation. The basic formula is as follows:
C - outflow coefficient dimensionless D- Orifice or throat diameter of the throttle under working conditions D- Inner diameter of the upstream pipeline qM - mass flow Kg/s QV - volume flow m3/s - diameter ratio D/d Dimensionless fluid density Kg/m3 Expansibility coefficient dimensionless
Three, application: LGK series orifice meter is the standard orifice differential pressure transmitter with multiple parameters (or differential pressure transmitter, temperature transmitter and pressure transmitter) form a complete set of high contrast range pressure flow device, can measure the rate of flow of gas, steam, liquid and gas, widely used in petroleum, chemical industry, metallurgy, electricity, heating, water supply in areas such as process control and measurement.
Iv. Main Features:
1, throttling device structure is easy to copy, simple, firm, stable and reliable performance, long service life, low price. 2, hole plate calculation using international standards and processing. 3, wide application range, all single-phase flow can be measured, part of the miscible flow can also be applied. 4, standard throttle device without real flow calibration, can be put into use. 5, a body orifice plate installation is more simple, no pressure tube, can be directly connected with differential pressure transmitter and pressure transmitter.
Five, technical parameters: caliber: DN25 ~ DN1000 (mm); Accuracy: ±1%FS; Range ratio: standard 1:13, expansion 1:30; Working pressure: ≤ 42.0mpa; Medium temperature: -40C ~ 450C; Medium viscosity: ≤30CP (equivalent to heavy oil); β value: 0.2 ~ 0.8; Connection mode: flange or clamping type; Flange standard: DN≤600mm, PN2.0 ~ PN26,HG20616; PN32 HG20618; DN > 600 mm, PN2.0 ~ PN15, HG20623; It can also be manufactured according to the flange standard provided by users. Material: main body, hole plate, pressure tube, three valve group: stainless steel; Straight pipe section and connecting flange: carbon steel or stainless steel; Installation mode: horizontal or vertical; Intelligent differential pressure transmitter: output: 4 ~ 20mA.DC or digital signal; Power supply: 24V.DC; Explosion-proof grade: D ⅱ CT5.6, IA ⅱ CT4-6; Protection class: IP67; Table head: blind table and digital display table two. 1. Standard hole plate for ring chamber pressure taking: it belongs to standard hole plate. Due to the realization of the ring chamber pressure, improve the measurement accuracy, shorten the installation of the minimum length of the linear pipe section, can be widely used in various departments. 2, Angle connection sheet d.u drilling pressure standard hole plate: belongs to the standard hole plate. When the pipe diameter is more than 400 mm, this form is mostly used. Pressure taking method is flange single d.u drilling pressure taking, circular pressure equalizing ring pressure taking or square pressure equalizing ring pressure taking. Hole plate form can be with handle hole or non-standard round hole plate, etc. 3, flange pressure standard hole plate: belongs to the standard hole plate. Regardless of the diameter of the pipeline, the center of the upper and lower pressure holes is located at 1 hour (25.5mm) of each end face of the orifice plate, which is widely used in the oil refining system. 4, diameter distance pressure standard hole plate: belongs to the standard hole plate. The pressure taking method is pipeline pressure taking. The center of the upstream pressure taking hole is located in front of the orifice plate at one times the inner diameter of the pipe. The center of the downstream pressure hole is located half of the inner diameter of the pipe from the back end face of the hole plate. 5, hole plate: a non-standard hole plate. For fluid measurements in pipe diameters from 10 mm to 50 mm. 6. Double orifice plate: it is composed of two standard orifice plates installed in a straight pipe at a certain distance from each other. According to the direction of the flow beam, the front hole is called the auxiliary hole plate, and the back hole plate is called the main hole plate. The section ratio of the auxiliary hole plate M1 is greater than that of the main hole plate M. Two orifice plates form a nozzle resembling a liquid wall. It is used for flow measurement of low Reynolds number fluids or high viscosity fluids. 7, round hole plate: a non-standard hole plate, suitable for dirty, or bubble out, or containing solid particles of fluid flow measurement, the measurement accuracy is low. 8, conical inlet orifice plate: belongs to non-standard orifice plate. The circular cone has an Angle of 45° with the centerline. The tapered inlet plate can be used in very low Reynolds number situations, but the pipe size should not be less than 25 mm.