Maintenance details and working principle of electric three-way valve

by:Lianke Valve     2022-08-21
The electric three-way control valve is used more and more widely because of its high adjustment accuracy, stable and reliable action, and the unique characteristics of one valve for multiple purposes. One can be used instead of two single-seat and double-seat control valves, which can also save installation pipelines, save investment, and occupy a small space. Powered by the power supply, it accepts a unified signal of 0-10mA DC or 4-20mA DC to drive the valve opening corresponding to this operating signal, so as to adjust the working parameters such as pressure, flow, liquid level and temperature. Structural features of electric three-way control valve: 1. When the diverter control valve of the electric three-way control valve is working, one channel is fully closed, and the other channel is fully open, and the force when closed is similar to that of a single-seat valve. 2. The electric three-way regulating valve is modified from single and double seat valves, and is guided by the valve core itself. 3. Due to the small unbalanced force of the small diameter, when DN≤80, the confluence regulating valve can be used in the diversion occasion. 4. The spool of the electric three-way regulating valve is the same as the sleeve of the sleeve valve, and its throttling area is divided into two types: opening the window and punching the small hole. The latter has the function of reducing noise and reducing resonance. The working principle of the electric three-way control valve: The valve body of the electric three-way control valve is a three-way structure, that is, one in and two out (split type), two in and one out (confluence type), and the confluence type is used to mix two fluids into a first Three fluids, or two of the same fluid at different temperatures, are mixed into a fluid of the same temperature. The split type is to divide a fluid into two fluids. The electric three-way control valve has 3 inlets and outlets connected to the pipeline, which is equivalent to the integration of two single-seat valves. The confluence regulating valve has two inlets and one outlet. The principle is that two fluids are mixed through the valve. For example, two fluids with different temperatures pass through the valve, and the fluids whose temperature is between the first two are mixed. The diverter control valve has one inlet and two outlets. It divides a fluid into two paths after passing through the valve. When the valve closes one outlet, the other outlet is opened. Periodic verification of electric three-way regulating valve Units that have not yet carried out predictive maintenance of electric three-way regulating valve should carry out regular verification of regulating valve. Periodic calibration work is preventive maintenance work. According to different production processes, the regular calibration of the regulating valve should have different calibration cycles. The periodic calibration period of each regulating valve can be determined in combination with the information provided by the manufacturer. This can usually be done at the same time as the overhaul of the process production process. When some control valves are used in high pressure, high pressure drop or strong corrosive occasions, the inspection period should be shortened. The content of the inspection is mainly to test the static performance of the control valve. If necessary, the corresponding test items can be added, such as the test of the flow characteristics of the control valve. Periodic calibration requires relevant testing equipment and instruments. Maintenance of electric three-way regulating valve Maintenance of electric three-way regulating valve is divided into emergency maintenance, regular maintenance and predictive maintenance. Emergency maintenance is the maintenance when the regulating valve fails and cannot meet the requirements of the process operation. Scheduled maintenance typically includes routine maintenance and maintenance performed concurrently with process shutdown overhauls. Predictive maintenance is a targeted maintenance of the relevant control valve components based on the analysis results of the predictive maintenance. Emergency maintenance is the maintenance after the failure of the regulating valve, and regular maintenance and predictive maintenance are the maintenance before the failure of the regulating valve. Usually, the routine maintenance of the regulating valve is carried out by the instrument maintenance personnel, and the periodic maintenance carried out at the same time as the overhaul is carried out by the manufacturing technicians.
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