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. 
 The oval gear in measured media pressure difference △ p = pl-p2 effect, resulting in the role of torque make it rotate. (A) position as shown in the role of P1 and P2, P1> P2, the joint torque wheel 1 produces clockwise, round a shell and half-moon volume of media row to exports, and led round 2 for counterclockwise rotation, The 1 driving wheel 2 is driven wheel (b) shown on the middle position, 1 and 2 are the driving wheel; and (c), position as shown, P1 and P2 on the role of a co-torque is zero, the combined torque of the 2 2 rotation counterclockwise rotation, and the media row already inhaled half-moon volume to the outlet, then 2 wheel, a driven wheel, (a) shown on the opposite. This cyclical nature of the round one and round two interchangeably by one driven by another rotation, the measured medium, half-moon volume time and again by the imported row to export. Clearly, the map (a), (b), (c) below, only the elliptical gears 1/4 weeks of their discharge measured medium is a half-moon volume. Therefore, the oval gear turn the quality of the measured dielectric alignment week four times the half-moon volume, volume flow rate Q through the oval gear meteor count as: 
 Q = 4nυ0 
 Where: 
 n - oval gear rotation frequency (rev / sec); 
 υ0 - half-moon part of the volume (shellfish). 
 Thus, under certain conditions of the half moon oval gear flowmeter volume υ0 measure the rotation speed n of the oval gear, you can know the flow of the measured medium. 
 Oval gear flow meter flow rate signal (ie, the rotational speed of the oval gear n), place Display and Remote Display two. 
 Local rotation of the gear through a series of deceleration and adjust the speed ratio agencies directly connected with the instructions on the needle in the instrument panel, and a mechanical counter to the total. 
 Remote Display a permanent magnet rotating, driven by deceleration after the gear spring relay contacts to the same rotational frequency as the permanent magnet synchronous closed or disconnected, which issued an electrical pulse far passed another indicator . 
 Oval gear flow meter features: 

 Flow measurement and fluid flow status has nothing to do, this is because of the oval gear flow meter is to rely on measured media pressure head measured promote the oval gears rotate. 

 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 installation: 

 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. 

 The small, meter leak error will be highlighted, and can no longer guarantee a 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 provided for use within the temperature range 
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