Cast iron oval gear flowmeter

ZW - LC - A seriesIs the main type of volumetric flowmeter for metering full pipe flow in closed pipelines under certain pressure of fluid flow.It has high accuracy and good reliability, long service life, wide range, the pressure loss is small, the advantages of strong adaptation, viscosity measurement is basically not affected by temperature, pressure change, and easy installation.Mainly used for measuring the accumulation of petroleum products flow, can also be used in other chemical solution, with the exception of corrosive medium.

Second, the working principle:

ZW - LC - A series of cast iron oval gear flowmeter measurement part is mainly composed of two mutually meshing elliptical gear and shell (measuring room), elliptical gear turn every week the parallelism of the measured medium quality for half moon volume 4 times, by the elliptical gear meteor millions of volume flow rate Q: Q = 4 n nu 0

Type:

N - the rotation of the elliptical gear frequency (r/s);

Nu 0 - half moon part volume (Mr.).

So, in the half moon volume of the oval gear flowmeter nu 0 given conditions, as long as the measure of elliptic gear rotational speed n, can know the measured medium flow.

Oval gear flowmeter flow signals (that is, the elliptic gear rotating speed n) showed that has two kinds of on-site display and remote transmission.

In situ show that the gear rotation through a series of deceleration and adjust speed than institutions, directly connected to the instrument panel on the indicating needle, and the total amount after mechanical counter display.

Far eastone shows mainly through the reduction gear after * magnet rotates, making spring relay contact with * magnet synchronization to make or break the rotation of the same frequency, thus far to another display instrument issued by electrical impulses.

Applications:

ZW - LC - A series of cast iron at the scene of the oval gear flowmeter is accumulative total instrument, has A simple structure and reliable in use, high precision, small pressure loss, less affected by the liquid viscosity change, wide range, easy installation, etc.This series of flowmeter is mainly used in petroleum, chemical industry, oil products, etc.

Four, the main features:

1, the flow measurement has nothing to do with the flow of the fluid, it is because the oval gear flowmeter is depend on the measured medium pressure head driving elliptical gear rotating and measure.

2, the greater the viscosity of the medium, from gear and measuring the less empty clearance leakage of the leak out, therefore the greater the nuclear medium sticky skin, the smaller the leakage error, to measure more advantage.

3, high measurement precision, is suitable for high viscosity medium flow measurements, but not containing solid particles of fluid (solid particles will gear jammed, so that you can't measure traffic).If the mixed with gas in the liquid medium to be measured, can also cause measurement error.

Five, the technical parameters:

1, safety explosion-proof: Exia Ⅱ CTSd Ⅱ BT4;

2, connection mode: flange connections: DN10 DN200 ~;

3, installation method: horizontal, vertical;

4, diameter series: DN10, 15,20,25,40,50,80,100;

5, loss of pressure: 0.1 MPa or less;

6, precision grade: normal 0.5 on the Richter scale, high accuracy 0.2 on the Richter scale;

7, medium pressure: regular 1.6 MPa, 3.2 MPa high-pressure type;

8, viscosity scope: ordinary: 0.6 ~ 200 mpa. S;

High viscosity of 200 ~ 1000 mpa. S;

9, medium temperature: regular < 120 ℃, high pressure type < 200 ℃;

10, table body material: cast iron, cast steel, stainless steel, etc.;

11, moving parts are: aluminum alloy, stainless steel, etc.

Six, instrument adjustment:

Instrument within the prescribed scope of traffic basic error is not more than plus or minus 0.5%.Error calculation method to meter the cumulative instructions flow Q refers to standard containers the difference between the real and actual flow Q Q solid percent, namely:

Error = (Q - Q solid)/Q x 99%

Instrument faster, error with "+";

Instrument is slow, error with "-" said.

In order to narrow the instrument and the difference between the actual flow, instrument equipped with transmission ratio control device, adjustment plate on the gear can be change.Instrument adjustment as appropriate when check gear 4, make the reading of the instrument and the actual flow as far as possible close to, instrument use after a period of time, or measuring the viscosity of the liquid or temperature changes its error value and check the error may not be consistent.To compensate for the error, can refer to adjust the gear list, choose the adjustment of the gear transmission ratio, to the factory purchase.

Seven, measurement requirements:

1, the flow measurement has nothing to do with the flow of the fluid, it is because the oval gear flowmeter is depend on the measured medium pressure head driving elliptical gear rotating and measure.

2, the greater the viscosity of the medium, from gear and measuring the less empty clearance leakage of the leak out, therefore the greater the nuclear medium sticky skin, the smaller the leakage error, to measure more advantage.

3, high measuring accuracy, suitable for high viscosity medium flow measurements, but not containing solid particles of fluid (solid particles will gear jammed, so that you can't measure traffic).If the mixed with gas in the liquid medium to be measured, can also cause measurement error.

Eight, installation and use:

1, the instrument should be in the direction of the installation direction arrow as shown on the instrument housing with the liquid in the same direction, installation position should be paid attention to for easy reading.

2, instrument installation as far as possible in normal situation, do not install in place of harmful gases and strong heat radiation, the meter counter part.

3, elliptical gear installed into a horizontal position as much as possible, should immediately dial into vertical position (dividing "0" should be in the above, in order to reduce the elliptical gear friction between the two plane and shell, reduce the wear parts.

4, meter installed in the output of the pump, if installed in the suction side, instrument filter pressure loss suction negative pressure of pump, pump shaft of the liquid outflow also caused the instrument error increases, the pump suction flange should also prevent side leakage, otherwise can cause the error of the instrument.

5, need to install filters in front of the instrument, not to let more than 0.2 mm particles through, prevent blockage due to particles, filters should be easy to clean.

6, instrument before installation of valve, the pipeline fluid only one-way flow, prevent damage of counter.

7, instrument, with the bypass valve, can be installed in horizontal or vertical pavilion to the other direction, from top to bottom, from bottom to top, from left to right, from right to left.

8, instrument when use, should be in the table is full of liquid, liquid to be tested should not be mixed with the gas inside, otherwise the measurement is not allowed.The liquid mixed with gas separator must be installed in front of the instrument.

9, instrument before installation, the pipelines should be carefully before removing debris, only when the instrument connected to pipe, to remove the plug on the instrument interface, to prevent debris into the table.When installing a instrument, should prevent debris into the pipeline.

10, flow in excess of the prescribed flow, oval gear as RPM increases wear increases, and the pressure loss has increased dramatically, so should avoid to use, small flow is still can calculate below zui, but error increases, the liquid viscosity meter in 10 centipoise start traffic is about to about 1% of full scale.

11, each instrument in the factory were in 7 # mechanical oil at room temperature calibration, oil viscosity varies between room temperature and normal temperature 13 centipoise next month.Volumetric flowmeter measurement of liquid viscosity change in theory, will not affect the measuring precision, but actually because of measuring gap exists between the interior wall and the elliptical gear, clearance of the leak amount affected by liquid viscosity changes.

12, when used to measure high viscosity liquid, usually heat the liquid in order to reduce the viscosity, flow, and then the pipe after the instrument downtime, meter inside is full of liquid cooling and sticky.You must steam in the title is enabled, external washing liquid thermal heating method, after waiting for liquid viscosity reduced in the instrument to use, otherwise the mucus will live transmission parts such as the damage.Do not sweep line steam through the table body, so as not to damage the instrument.

13, measured liquid temperature should not be higher than the specified value, more than even stuck, liquid temperature changes viscosity influence also additional error.In addition, the increase of the temperature increase also caused new moon space volume, make the instrument "go slow", when measuring chamber with elliptic gear such as cast iron, additional error is about 0.33% + / 100 ℃;Measuring room for cast iron, the elliptical gear such as cast aluminum when additional error is 0.14% + / 100 ℃.

14, of the pipeline flow should not dramatically increase or decrease, avoid pipeline vibration, hydraulic shock and stress the phenomenon such as volatility, otherwise will affect the normal work of the instrument.

15, the pressure loss is directly proportional to the square of the liquid flow rate, liquid viscosity increases, the pressure loss is also increased.

Nine, appearance size:

Standard measuring range: unit: mm

Ten, measuring range:
Ordinary cast iron type (AType), cast steel,EType), stainless steel,B）

Eleven, selection of coding:

Twelve, design selection and order notes:

1, choose oval gear flow timing, it is suggested that according to the measured liquid flow control meter flow range of 30 ~ 70% choose specifications;According to the fluid temperature, and the size of the pipeline pressure, and corrosion properties of liquid viscosity, etc to select flowmeter types;

2, when ordering, please specify the model of flow meter, diameter (mm), whether to ask explosion-proof, name of the medium, flow range (m3 / h), work pressure (MPa), temperature (℃), medium viscosity (MPa) s), to measure the corrosion medium, the user must also specify the medium corrosion properties, medium concentration (%), medium temperature (℃);

3, this product can according to user requirements, within the header assembly electrical/current transmission device;

4, when ordering parts, please click and fill in the figure, the collapse of the list;

5, user, if you have special request, please put forward in order;

6, our company can provide filters, venting device with flow meter, intelligent flow integrating instrument.

After-sales service commitment:

1, our company sold by flow meter series products within twelve months appear quality problem, is responsible for free maintenance.

2, the warranty period, any quality problems such as the products of our company, my company is responsible for free repair or replacement.

3, the warranty period, such as user improper use, damaged products, my company is responsible for the maintenance, charge damage parts cost.

4, after the warranty period appear quality problem, my company is responsible for the maintenance, charge damage parts cost.

5, such as user need to my company site services, to users in the province I company service personnel to reach the site within 12 hours, fujian association of foreign languages and user reach the site within 48 hours.