The role of the flow control valve of the ultrasonic flowmeter

Do you know what is the function of the flow control valve of the ultrasonic flowmeter? In response to this issue, let us discuss and analyze why we think so? u200bu200b1. Flow control ultrasonic flowmeter In theory, the pressure regulating valve can control the flow, but in practice, there are the following problems. (1) The self-operated pressure regulating valve adjusts the flow under the condition of the pressure before and after the valve, and its direct reference object is the pressure, so it is difficult to realize the jing que adjustment of the flow. (2) To adjust the flow with the pressure regulating valve, the pilot needs to be reset. Affected by the working conditions, the on-site operation is difficult and takes a long time. (3) Online adjustment and setting of the pressure value of the pressure regulating valve pilot can easily lead to instantaneous gas stop or flow over-range. (4) Affected by the relationship between gas supply and demand, the actual set value of the pressure regulating valve is not necessarily equal to the pressure value behind the valve. When the supply and demand relationship is reversed, accidents are prone to occur. Use electric regulating valve to control the flow, directly adjust the flow section, and the on-site operation is convenient, fast and safe. 2. Protect the process equipment (1) Protect the on-off valve. Process switching is a frequent process operation in the gas transmission station. In the process of opening the on-off valve, the violent flow impact can easily erode the sealing surface of the on-off valve, resulting in internal leakage of the equipment. According to the process switching operation rules, taking advantage of the structure of the flow control valve, after the front and rear switch valves are fully opened, slowly open the flow control valve, which can concentrate the impact on the flow control valve and reduce or even eliminate the impact on the upstream and downstream switches during the process switching process. The instantaneous impact of the valve extends the service life of the equipment. (2) Protect the pressure regulating valve. The pressure regulating system of the gas pipeline adopts the Chinese FISHER skid body, and the easy-to-pick parts of the pressure regulating valve are the valve sleeve, the valve core and the lower valve body. The pressure regulating valve and the flow regulating valve are used to work together, and the opening of the flow regulating valve is adjusted reasonably, and the valve sleeve of the pressure regulating valve is moved as far as possible in the large opening section, so as to increase the flow section of the pressure regulating valve and disperse the erosion surface. Practice has proved that the joint work of the pressure regulating valve and the flow regulating valve can prolong the replacement cycle of the wearing parts of the pressure regulating valve and reduce the production and operation cost. 3. Suppression of surge When the ultrasonic flowmeter is supplying air with a small flow, the phenomenon of surge often occurs, that is, the flow is quasi-periodically fluctuating. According to the analysis, in the small flow section, the sensitivity of the pressure regulating valve decreases, and it is easy to produce instantaneous lag or instantaneous excess of regulation, resulting in surge flow. By reducing the opening of the regulating valve and suppressing the instantaneous excessive process of regulation, the surge suppression can be achieved. Therefore, through the above description, do you already have a new understanding of the flow control valve of the ultrasonic flowmeter? .

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