Orifice valve flowmeter

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1. Introduction to Orifice Valve

Orifice valve is a throttling differential pressure flowmeter, which is currently the most widely used flow measuring instrument in the world. All single-phase fluids, including liquid, air land gas, steam, etc., can be measured. The orifice plate, nozzle, and Venturi tube have undergone in-depth laboratory research and have formed standard throttling devices.

2. Which of orifice flowmeter and Venturi tube limits more flow? Orifice flowmeter and Venturi flowmeter are very different in many aspects. In order to reduce the energy loss of fluid flowing through the throttling element, the Venturi flowmeter uses a section of tapered and expanding tube instead of orifice plate. The orifice flowmeter is equipped with an interchangeable orifice plate, which has circular small holes on the liquid surface, much smaller than the diameter of the pipeline. The orifice plate is placed in the fluid pipeline. In terms of working principle, orifice flow meters and Venturi flow meters are similar, but some major differences are that the orifice plate can be easily replaced to adapt to a wide range of different flow rates, while the throat diameter of the Venturi tube is fixed. The brother chain limits the measured flow rate range by the actual pressure difference. Due to the vortex appearing on the downstream side of the orifice plate, the permanent loss of the orifice flow meter is significant, while the structure shape of the Venturi flow meter can avoid the formation of vortices, thereby greatly reducing the permanent loss. The energy loss of the Venturi flowmeter in measuring flow is much smaller than that of the orifice flowmeter. However, due to the longer manufacturing and processing time and higher price of the Venturi flowmeter compared to the orifice flowmeter, the orifice flowmeter has the least trouble and cost in pipeline installation. In fluid measurement, Venturi flow meters are generally used for measuring gas flow at low flow rates. The orifice flow coefficient in orifice flow meters is significantly affected by fluid disturbances, which come from valves, elbows, and other fittings installed upstream of the orifice. Its flow coefficient value is less affected by downstream disturbances. Usually, this type of flowmeter should be installed at a distance of 50 times and 10 times the diameter of the upstream and downstream disturbance components, respectively. Obviously, the required distance is related to the nature of the disturbance. So when measuring with an orifice flowmeter, it is necessary to install the orifice flowmeter correctly according to the disturbance of the fluid. Working principle of orifice flowmeter: The fluid filled in the pipeline flows through the orifice flowmeter inside the pipeline, causing local contraction and increasing flow velocity, resulting in a static pressure difference between the upstream and downstream sides. Under the condition of known parameters, the relationship between differential pressure and flow rate can be derived based on the principle of flow continuity and Bernoulli equation to obtain the flow rate. Working principle of Venturi tube: Differential pressure flow measuring instrument, whose basic measurement principle is based on the law of conservation of energy - Bernoulli equation and flow continuity equation as the basis of flow measurement method. Suitable for accurate measurement of medium and low pressure, large pipe diameter, and low f

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