First, an overview 
 The working principle of the oval gear flowmeter liquid to promote a pair of oval gear rotation; the volume of each chamber is a fixed volume; gear speed leads, the sensor sends the sync pulse count, oval gears rotate through the magnetic sealing couplings and transmission reduction gear passed directly to a counter indicating the total amount flowing through the flowmeter. Additional letter device, adding to the electric instrument Far EasTone only instantaneous flow or accumulated flow. 
 Typical applications 
 The oval gear flow meter used to measure the high viscosity of the medium, the products are widely used in petroleum, petrochemical, natural gas, chemicals, paper and other industries, mainly for gasoline, diesel, hydraulic oil, kerosene, light oil, heavy oil. 
 Main advantages: 
 ◆ caliber from 10 ~~ to 150mm; 
 ◆ variety to choose from: aluminum, stainless steel and high pressure stainless steel, PPS, bronze and other shell material; 
 ◆ bearing material, a variety of available options: ceramic, bronze, Hastelloy, carbides, the PPS, such as stainless steel; 
 ◆ the axis of the material: 316 stainless steel; 
 ◆ O-ring material VITON, fluorine rubber, stainless steel, Teflon for selection; 
 ◆ 10:1 turndown up to 50:1; 
 ◆ Accuracy ± 0.2% and ± 0.5% in two types of repeatability of ± 0.03%; 
 ◆ straight pipe installation requirements: 5D +3 D, the need to install the filter; 
 Up to 1,000 000CP ◆ viscosity; 
 ◆ pressure rating of up to 551bar; 
 ◆ temperature levels up to -10 to 60 ° C; 
 Second, the technical performance characteristics 
 An oval gear flowmeter, technical performance model caliber minimum flow maximum flow accuracy level pressure (Mpa), the LC -880.040.40.5,0.21.6,2.5,4.0,6.4 LC-15150.161.5LC-20200.33LC -25250.66LC-40401.515LC-50502.424LC-8080660LC-10010010100LC -15015012120 2. the characteristics of the oval gear flow meter flow measurement and flow of fluid, which is oval gear flow meter is to rely on measured media pressure head to promote the oval gear rotation measured. Viscosity, the greater the media, the smaller the leakage gap leak from the gear and measurement of space, nuclear measuring media sticky skin the greater the smaller the leak error, the more beneficial for measurement. Oval gear flow meter measurement accuracy is high, the flow in high viscosity media measurement, but does not apply to the fluid contains solid particles (solid particles in the gear stuck, making it impossible to measure flow). If the measured liquid medium is mixed with gas, can also cause measurement error. The oval gear flow meter is a kind of positive displacement flow meter for precision continuous or intermittent measurement pipe liquid flow or transient flow. It is particularly suitable for the traffic of heavy oil, polyvinyl alcohol, resins and other high viscosity media measurement. 
 Third, the principle 
 Measurement of the working principle of the oval gear flowmeter, oval gear flow meter is constituted mainly by two oval gear meshing and its shell (measurement chamber) 
 Four. Oval gear flow meter installation and use of Note 
 Oval gear flow meter should be clean before installing pipe. If liquid containing solid particles, you must install filters in the pipeline upstream; containing gas should be installed in the exhaust. Oval gear flow meter straight pipe right before and after certain requirements. It can be installed horizontally or vertically. Oval gear flowmeter installation, the axis of rotation parallel to the ground. Installation dimensions see the corresponding chapter. When used in accordance with the oval gear flow meter is properly installed, you can guarantee a sufficient accuracy, usually the total value of the accuracy up to 0.5, is a more accurate flow measurement instrument. However, if the use of the measured medium flow is too small, the instrument of leakage error will be highlighted, and can no longer guarantee that sufficient measurement accuracy. Therefore, different model specifications of the oval gear flow meter Minimum flow to an allowable value, the measurement accuracy can be guaranteed only when the actual measured flow rate is greater than the minimum flow allowed values. Secondly, the use of oval gear flow meter is to pay attention to the temperature of the measured medium is not too high, otherwise will not only increase the measurement error, and the gear card dead may. To this end, the oval gear flow meter in the instrument under the operating temperature range. Long-term use of the oval gear flowmeter, the internal gear corrosion and wear, which affects measurement accuracy. Therefore, we should always observe, and remove the check on a regular basis, if the conditions allow the best regular calibration. 
 Five, oval gear flow meter model, said method specifications model 123456 instructions to the public, said diameter counter nominal pressure characteristics of Fat hearing devices work temperature LC said: oval gear flow meter 8 public, said diameter 8mm 15 public, said diameter 15mm 25 public, said diameter is 25mm 40 kilometers, said diameter 40mm 50 public, said diameter 50mm 80 public, said diameter 80mm 100 male said diameter 100mm 150 public, said diameter is 150mm the W without the head pulse Fat News J mechanical counter E electronic counter H back to zero mechanical counter 1.6 public said pressure is 1.6Mpa 2.5 nominal pressure of 2.5 Mpa 4.0 nominal pressure of 4.0 Mpa and 6.3 nominal pressure of 6.3 Mpa C304 rotor 316 stainless steel CC304 shell 304 C316 stainless steel rotor, the rotor 304 CC316 stainless steel casing, the rotor is 316 stainless steel F flood pulse output I Fat News Current output A Operating temperature -20 ~ 80 B, operating temperature -20 to 150