Nowadays, our requirements for things are getting higher and higher, and we are the same for electric three-way control valves, but for those who don’t know him, they don’t know how to choose, but also for how it works. Tangled? So what should we pay attention to when choosing an electric three-way control valve? Because our lack of understanding is more confused when purchasing. Today, Xiaobian will take a look at the electric three-way control valve purchase skills and working principle! Electric three-way control valve purchase tips First, the operating thrust: the main structure of the valve electric device has two kinds: one is not equipped with a thrust plate, direct output torque; the other is to configure the thrust plate, the output torque is converted to output thrust through the stem nut in the thrust plate. Second, the operating torque: operating torque is the most important parameter to select the valve electric device, the output torque of the electric device should be 1.2 to 1.5 times the maximum torque of the valve operation. Third, the number of output shaft rotation: the number of rotations of the output shaft of the valve electric device is related to the nominal diameter of the valve, the pitch of the valve stem and the number of threads. It should be calculated according to M=H/ZS (M is the electric device should meet) The total number of revolutions, H is the valve opening height, S is the stem drive thread pitch, and Z is the stem thread number). Fourth, the output speed: If the valve's opening and closing speed is too fast, it is easy to produce water hammer phenomenon. Therefore, the appropriate opening and closing speed should be selected according to different conditions of use. V. Stem Diameter: For multi-turn type open rod valves, if the maximum stem diameter allowed by the electric device cannot pass the valve stem of the valve, it cannot be assembled into an electric valve. Therefore, the inner diameter of the hollow shaft of the electric device must be larger than the outer diameter of the stem of the open rod valve. For the partial rotary valve and the dark rod valve in the multi-turn valve, although the problem of the diameter of the stem is not considered, the diameter of the stem and the size of the keyway should be fully considered in the selection, so that the assembly can work normally. Electric three-way control valve working principle: The self-operated regulating valve uses the feedback signal (pressure, differential pressure, temperature) at the output of the valve to transmit the valve to the actuator to drive the valve flap to change the opening of the valve to achieve the purpose of regulating pressure, flow and temperature. This regulating valve is divided into two types: direct acting and indirect acting. The direct acting type is also called spring loaded type, and its structure has elastic elements such as: spring, bellows, bellows type warm pack, etc., which utilizes the principle of balance between elastic force and feedback signal. The indirect acting regulating valve adds a pilot (pilot valve) which amplifies the feedback signal and then drives the main valve flap to move the valve opening to change the valve opening. In the case of a pressure regulating valve, the feedback signal is the outlet pressure of the valve and is introduced into the actuator through the signal tube. In the case of a flow regulating valve, there is an orifice plate (or other resistance device) at the outlet of the valve to extract the differential pressure signal from both ends of the orifice plate into the actuator. In the case of a temperature regulating valve, the outlet of the valve has a temperature sensor (or a warm pack) that drives the actuator through thermal expansion and contraction of the medium in the temperature sensor. The above is the small series of electric three-way control valve introduced for you today, the purchase skills and working principles are here to end, I believe that we have a certain understanding of the electric three-way control valve through today's introduction. For more information, please stay tuned to the renovation home.
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