Electric three-way control valve features electric three-way control valve classification

Electrical three-way control valve is a common connection between the water pipeline in our life, electric three-way control valve is in the ordinary three-way control valve on the basis of upgrading into a more advanced and effective pipeline connection items. Electric three-way control valves are used in a wider and wider range of applications because of their high precision, stable operation and other advantages. Here we come to understand the electric three-way control valve information.

I. Introduction to the characteristics of electric three-way control valve

Electric three-way is an important executive unit instrument in industrial automation process control. With the increasing degree of automation in the industrial field, it is being used more and more in a variety of industrial production areas. Compared with the traditional pneumatic control valve has obvious advantages: energy saving (only consume electricity when working), environmental protection (no carbon emission), fast and convenient installation.

Electrical three-way product features

1, the fluid to the spool direction of action are in the flow open state, so the work of good stability.

2, in addition to the bonnet at the bushing guide, the spool side and the inner surface of the valve seat also has a guiding role, guiding a large area, reliable work.

3. The servo amplifier adopts deep dynamic negative feedback, which can improve the adjustment precision.

4, electric operator has a variety of forms, can be applied to 4 ~ 20mA.DC or 0 ~ 10mA.DC.

5, electronic electric control valve can be directly from the current signal control valve opening, without servo amplifier.

6, saving automation investment, compared with single-seat, double-seat or sleeve control valve, the composition of the same system can be eliminated a valve, simplify the system, save investment.

7, bellows sealing type of moving stem to form a complete seal, blocking the fluid leakage.

8, three-way control valve is divided into T-type and L-type, the medium for the diversion and merging, the selection of type according to the site conditions to determine.

II. Electric three-way classification and structure

Electric three-way according to the way the fluid is divided into two categories of merging valve and shunt valve. Combined flow valve has two inlets, combined flow from a single outlet. Diverter valve has a fluid inlet, by shunting into two streams of fluid from two outlets. The structure of the combined three-way control valve is similar to that of the split three-way control valve. Its characteristics are as follows:

1, electric three-way has two spools and seats, the structure is similar to the double-seat valve. But the electric three-way control valve, a spool and the valve seat of the flow area between the increase, the other spool and the valve seat of the flow area between the decrease. And double-seat valve, two spool and the valve seat between the circulation area is increased or decreased at the same time.

2, electric three-way air open and air closed can only be realized by selecting the positive and negative action of the actuator. Double-seat valve air open and air shut off the change can be directly to the valve body or spool and seat reverse mounted m buy now.

3, electric three-way used in the need for fluid proportioning control system, because it replaces a gas open control valve and a gas shut-off control valve, therefore, can reduce costs and reduce the installation space.

4, electric three-way also used for bypass control places, for example, all the way through the heat exchanger fluid heat transfer, the other way the fluid does not heat transfer. When the electric three-way control valve in front of the heat exchanger, the use of shunt three-way control valve; when the three-way control valve is installed after the heat exchanger, the use of combined flow electric three-way control valve. As installed in the heat exchanger before the three-way valve flow through the fluid has the same temperature, therefore, the leakage is small; installed in the heat exchanger after the three-way valve flow through the fluid has a different temperature, on the spool and the valve seat of the expansion of the degree of difference, therefore, the leakage is larger. Usually, the temperature difference between the two streams of fluid should not exceed 150 ℃.

5. The three-way control valve with valve cage structure, with balanced holes, is guided by the valve cage. Therefore, the unbalance force can be greatly reduced. Early three-way control valve with a cylindrical thin-walled window, using the spool side guide, although the unbalance force can be reduced, but in a stream of fluid close to closing (flow off flow direction), there is still a large unbalance force, and, with the valve opening, the unbalance force changes, the use of a valve cage structure with a balanced hole, the unbalance force can be eliminated, and has a damping effect, is conducive to the stable operation of the control valve.

The above content is what I summarized for you about the characteristics of electric three-way control valve, electric three-way classification and structure introduction. Electric three-way control valve before installation, please be sure to carefully read the instructions, cut off the power supply and must be installed by professional and technical personnel before use.