The measuring orifice is a very important tool used to measure the flow of fluids, such as gas, liquids or various mixtures. It is no coincidence that it is widely used in various industries. What is its operating principle and how can it be calculated?
Check the measuring orifices at the Onninen wholesaler
How does a measuring orifice work?
The measuring orifice has a fairly simple design. It consists of a tube mounted in the flow line. Inside it there is a narrowing, which increases the velocity at this point. On both sides of the narrowing there are measuring holes, which allow for measuring pressures. Usually, additional pressure holes are also used at the ends of the tube, because in this way atmospheric pressure can also be measured.
As soon as the substance flows through the orifice, a pressure difference is created on both sides of the restriction. Higher pressures are measured before the restriction, lower pressures after the restriction. This type of pressure difference tells you what its value is. If the pressure difference is high, it means that the flow is high. And vice versa - if the difference is not too significant, the flow is low.
How to calculate results from a measuring orifice?
To obtain reliable results, they must be calculated. This is not a difficult task, you need to know the basic principles. Considering the pressure difference mentioned in the previous paragraph, the Bernoulli equation is used, taking into account the appropriate corrections. In many cases, when the measurement conditions are very favorable and the flow is laminar, accurate results can be obtained, without any interference or other problematic events. Sometimes, however, they unfortunately happen, which has a negative impact on the accuracy of the measurements. These include incidents such as turbulence in the flow, installation conditions that are far from ideal or the presence of contamination. It is therefore always very important to calibrate the measuring orifice, which will allow you to adjust the results to the actual operating conditions, thus obtaining adequate results.
Flow measurement orifices at the Onninen wholesaler
The Onninen hydraulic wholesaler offers a wide selection of measuring orifices. All are made of high-quality materials, ensuring reliable measurements in various working conditions. The wholesaler's offer includes orifices of various sizes and construction materials such as stainless steel and durable plastics. They are reliable because they are manufactured by proven companies such as IMI TA .
The brand provides access to the best flow measuring orifices with self-sealing measuring nozzles. Their main feature is fast and accurate measurements during hydraulic balancing. Durable, solidly designed, they guarantee a long service life. The application is very wide - for heating/cooling installations and for domestic hot water installations and for drinking water. Regardless of the model we choose, we should always remember the basic principles of use. Before we install it, check whether the orifice is clean and undamaged. It is also important that the section of straight pipe before and after the measuring orifice is long enough.
In summary, the measuring orifice is an extremely helpful and effective tool for measuring the flow of fluids and gases. It measures the pressure difference at the narrowing point, thanks to which the flow of the substance can be precisely calculated. It is no coincidence that the orifice is used in many areas where obtaining accurate measurements is most important.