Function of three-way regulating valve characteris

2022-07-22
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The three-way regulating valve is used to regulate the medium flow, pressure, temperature, liquid level and other process parameters in the field of industrial automation process control. According to the control signal in the automation system, the opening of the valve is automatically adjusted to realize the adjustment of medium flow, pressure, temperature and liquid level

the three-way regulating valve, also known as the control valve, is the final control element in the field of industrial automation process control, which changes the process parameters such as medium flow, pressure, temperature, liquid level, etc. by receiving the control signal output by the regulating control unit and with the help of power operation. Next, I will introduce the function and characteristics of the three-way regulating valve

function of three-way regulating valve

first of all, the three-way regulating valve is the executive unit of an automatic control system. It works under the voltage condition of 220 volts, and can accept the current or voltage signals from the regulating instrument, so that it can control the operation. It mainly controls the displacement change of the valve through the output thrust of the straight stroke, and then can achieve the function of accurately controlling the process parameters of the fluid medium

classification structure of three-way regulating valve

1. The three-way regulating valve has two valve cores and valve seats, and its structure is similar to that of double seat valve. However, in the three-way regulating valve, when the flow area between one valve core and the valve seat increases, the flow area between the other valve core and the valve seat decreases. In the double seat valve, the flow area between the two valve cores and the valve seat increases or decreases at the same time

2. The air opening and closing of the three-way regulating valve can only be achieved by selecting the positive and negative effects of the actuator. The change of the air opening and closing of the double seat valve can directly reverse the installation of the valve body or valve core and the valve seat

3. When the three-way regulating valve is used in the control system that requires fluid proportioning, because it replaces an air on control valve and an air off control valve, it can reduce the cost and reduce the installation space

4. The three-way regulating valve is also used in the place of bypass control. For example, one fluid exchanges heat through the heat exchanger, and the other fluid does not exchange heat. When the three-way valve is installed in front of the heat exchanger, the shunt three-way regulating valve is adopted; When the three-way regulating valve is installed behind the heat exchanger, the combined three-way regulating valve is used. Since the fluid flowing through the three-way valve installed in front of the heat exchanger has the same temperature, the leakage is small; The fluid flowing through the three-way valve installed behind the heat exchanger has different temperatures, and the expansion degree of the valve core and valve seat is different. Therefore, the leakage is large. Generally, the temperature difference between the two fluids should not exceed 150 ℃

characteristics of three-way regulating valve

1. The fluid of the electric three-way regulating valve of heat transfer oil is in the open state on the action direction of the valve core, so it has good working stability

2. The servo amplifier adopts deep dynamic negative feedback, which can improve the adjustment accuracy

3. The electric three-way regulating valve of heat transfer oil saves automation investment. Compared with single seat, double seat or sleeve regulating valve, forming the same system can save a valve, simplify the system and save investment

4. There are many forms of electric operators, which can be applied to 4 ~ 20mA DC or 0 ~ 10ma dc。

5. The opening of electronic electric control valve can be directly controlled by current signal. No servo amplifier is required

6. The bellows sealing type forms a complete seal on the moving valve rod to prevent fluid leakage

7. Except for the bushing guide at the valve cover, the electric three-way regulating valve of heat transfer oil. The side of the valve core and the inner surface of the valve seat also have a guiding effect, with a large guiding area and reliable operation

editor's summary: This is the introduction of the function and characteristics of the three-way regulating valve. I hope it will be helpful to you. If you want to know more, you can pay attention to information

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