What is the internal structure of the three way control valve

The following is the body structure of the three-way control valve**, you can look at it, you can see from the figure that the three-way control valve has two valve seats, to give a column, the valve is now three-way confluence regulation, the left and the bottom are the inlet pipe, the left side of the cold water into the hot water, you need to adjust the temperature of the mixed water, this is the most typical case, the valve factory state is set to 4mA when the valve is left and right, the lower inlet is closed, so now adjust the mixing temperature to input 4-20mA signal, When 12mA, the left and the bottom are opened half, and the left side is fully closed when the 20mA signal is entered, and the bottom is fully open, so that the left and bottom sides can be adjusted to open the water, so as to control the temperature of the mixed water. (FYI).

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

In the field of industrial automation process control, the three-way control valve, also known as the control valve, is the final control element that changes the process parameters such as medium flow, pressure, temperature, and liquid level by accepting the control signal output by the regulation control unit and using power operation. Next, we will introduce the role of the three-way control valve and the characteristics of the three-way control valve.

The role of the three-way control valve.

First of all, the three-way control valve is an execution unit of an automatic control system, which works under the voltage condition of 220 volts, and can accept the current or voltage signal from the regulating instrument, so that it can control the operation. It is mainly through the output thrust of the linear stroke to control the displacement change of the valve, and then the function of accurately controlling the process parameters of the fluid medium can be achieved.

Classification structure of three-way control valves.

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

2. The air opening and closing of the three-way stuffy Huaihu control valve can only be achieved by selecting the positive action and reaction of the actuator. The change of air opening and air closing of the double-seat valve can directly reverse the valve body or valve crack core and valve seat.

3. When the three-way control valve is used in the control system that needs to be proportioned by fluid, because it replaces an air-open control valve and a gas-closed control valve, it can reduce the cost and installation space.

4. The three-way control valve is also used in the place of bypass control, for example, one fluid is transferred through the heat exchanger, and the other fluid is not heat-exchanged. 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 control valve is installed behind the heat exchanger, a combined three-way control 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 smaller; The fluid flowing through the three-way valve installed behind the heat exchanger has different temperatures, and the degree of expansion of the spool and seat is different, so the leakage is large.

In general, the temperature difference between the two streams should not exceed 150 °C.

Features of the three-way control valve.

1. The fluid of the electric three-way control valve of heat conduction oil is in the open state of flow to the valve core, so the working stability is good.

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

3. The electric three-way control valve of heat conduction oil saves automation investment, compared with single-seat, double-seat or sleeve control valves, the same system can save a valve, simplify the system and save investment.

4. The electric operator has a variety of forms, which can be applied to 4 or 0.

5. The electronic electric control valve can directly control the valve opening by the current signal. No servo amplifier required.

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

7. The electric three-way control valve of heat conduction oil is guided by the bushing at the valve cover. The side of the spool and the inner surface of the seat also have a guiding effect, and the guiding area is large and the work is reliable.

Three-way valve:

The three-way valve body has three ports, one in and two out, (left in, right and down) and ordinary valves are different in that there is an outlet at the bottom, when the internal valve core is in different positions, the outlet is different, such as the valve core in the lower part, the left and right are connected, such as the valve core in the upper part, the right outlet is blocked, and the left and lower ports are passed.

How the three-way valve works:

The three-way valve body has three ports, one in and two out, (left in, right and down) and ordinary valves are different in that there is an outlet at the bottom, when the internal valve core is in different positions, the outlet is different, such as the valve core in the lower part, the left and right are connected, such as the valve core in the upper part, the right outlet is blocked, and the left and lower ports are passed. Because the left and right mouths are not on the same horizontal line. When the high gas emergency is dissolved, the valve is closed and the feed water is bypassed.

Features of the three-way valve:

1.A three-way valve has two spools and a seat structure similar to a two-seat valve, but in a three-way valve, as the flow area between one spool and seat increases, the flow area between the other spool and seat decreases. In a double-seat valve, the flow area between the two spools and the seat increases or decreases at the same time.

2.The air opening and closing of the three-way valve can only be achieved by selecting the positive and negative action of the actuator, while in the double-seat valve, the air opening and closing can be directly achieved by reversing the valve body or spool with the seat.

3.When the three-way valve is used in a control system that requires fluid proportioning, it can reduce installation costs and space because it can replace both an air-open control valve and an air-close control valve.

4.Three-way valves can also be used in bypass control places, for example, one fluid needs to pass through the heat exchanger, and the other fluid does not need to go through the heat exchanger, when the three-way valve is installed in front of the heat exchanger, the shunt three-way valve is used when the three-way valve is installed in front of the heat exchanger, and when the three-way valve is installed behind the heat exchanger, the confluence three-way valve is used. Since the liquid flowing through the three-way valve installed in front of the heat exchanger has the same temperature, the leakage is smaller, and the liquid flowing through the three-way valve installed behind the heat exchanger has different temperatures, and the degree of expansion of the spool and seat is different, therefore, the leakage is larger.

In general, the temperature difference between two liquids should not exceed 150 degrees.

Generally speaking, the meaning of the import and export, the tee means that the valve has three inlets and outlets, generally speaking, there is an inlet, two are the outlets of different paths, and the path of the valve medium is realized by controlling the position of the valve disc, and some tees can control the two different paths separately, and some valves can control the valve at the same time to let the medium pass through the two channels at the same time, I hope it will help you, and there is no clarity.

The three-way valve is divided into two types: the merge valve and the diverter valve according to the mode of fluid action, and the confluence valve has two inlets, and flows out from one outlet after the merger. The diverter valve has an inlet, which is diverted and exited by two outlets. The three-way valve body has three ports, one in and two out or two in and one out; Different from ordinary valves, when the internal valve core is in different positions, different outlets are conducted, such as when the valve core is in the lower part, the left and right are connected, and the lower outlet is closed; If the spool is in the upper part, the lower left side is connected, and the right outlet is closed.

Three ports, one in and two out, (left in, right and down) and ordinary valves are different in that there is an outlet at the bottom, when the internal valve core is in different positions, the outlet is different, such as the valve core in the lower part, the left and right are connected, such as if the valve core is in the upper part, the right outlet is blocked, and the left and lower ports are passed. Because the left and right mouths are not on the same horizontal line. When the high gas emergency is dissolved, the valve is closed and the feed water is bypassed.