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The regulating function and flow characteristics of the V-type electric regulating ball valve

V-type electric regulating ball valve: It is a rotary ball valve whose core valve seat is made of metal or metal-to-PTFE seal. It combines the best control characteristics of the ball valve and the butterfly valve into one, and can be used as a control valve. It can also be used as a shut-off valve. Its main features are:

(1) Integral valve body without any pipe joints, so it is not affected by pipeline or bolt stress, and because the valve body does not have any pipe joints, the pressure-resistant shell will not be affected by pressure "mutations";

(2) With a V-shaped valve body, even in the case of small flow or high viscosity medium, it can also ensure the accuracy of control in the entire range;

(3) The leak-proof and durable valve seat is lined with a stainless steel inner core PTFE cup-shaped or O-shaped sealing ring at its outer diameter. The valve seat is made of tungsten-cobalt cemented carbide with a larger cross-section. The spring further enhances the structure of the valve seat;

(4) When the valve is closed, a wedge-shaped shearing effect is generated between the V-shaped notch and the valve seat, which not only has the function of self-cleaning but also prevents the core from jamming. It is especially suitable for the occasions of pipeline fouling and freezing or containing fiber and particle solids. .

It is suitable for high viscosity, suspension, pulp and other unclean and fiber-containing media. It adopts direct connection to connect with the actuator, which has the advantages of compact structure, small size, light weight, low resistance, stable and reliable action, etc. The actuator is equipped with electronic electric actuator or pneumatic piston actuator such as GTX and AL according to user requirements. The regulating valve is used to regulate the flow, pressure and liquid level of the medium. According to the signal of the adjustment part, the opening of the valve is automatically controlled to achieve the adjustment of the medium flow, pressure and liquid level. Control valves are divided into electric control valves, pneumatic control valves and hydraulic control valves. The regulating valve is composed of two parts: electric actuator or pneumatic actuator and regulating valve. The adjustment is usually divided into two types: straight-through single-seater and straight-through two-seater. The latter has the characteristics of large flow capacity, small imbalance and stable operation, so it is usually especially suitable for occasions with large flow, high pressure drop and less leakage.

The flow characteristic of the regulating valve is the relationship between the relative flow of the medium flowing through the regulating valve and its opening under the condition that the pressure difference between the two ends of the valve remains constant. The flow characteristics of the regulating valve include linear characteristics, equal percentage characteristics and parabolic characteristics. The meanings of the three fluence characteristics are as follows:

1) Equal percentage characteristic (logarithm), the relative stroke and relative flow of equal percentage characteristic are not in a straight line. The change in flow caused by the change of unit stroke at each point of the stroke is proportional to the flow at this point, and the percentage of flow change Are equal. Therefore, its advantage is that when the flow rate is small, the flow rate changes small, and when the flow rate is large, the flow rate changes greatly, that is, at different opening degrees, it has the same adjustment accuracy.

2) Linear characteristic (linear), the relative stroke of the linear characteristic and the relative flow are in a linear relationship. The flow change caused by the change of unit stroke is constant. When the flow is large, the relative value of the flow changes little, and when the flow is small, the relative value of the flow changes greatly.

3) Parabolic characteristic, the flow rate changes in proportion to the two sides of the stroke, and generally has an intermediate characteristic between linear and equal percentage characteristics.

From the analysis of the above three characteristics, it can be seen that in terms of its adjustment performance, the equal percentage characteristic is the best, its adjustment is stable and the adjustment performance is good. The flow characteristics of the electric V-type control valve are equal percentages, so it has the best control characteristics. The parabolic characteristic is better than the linear characteristic. Any one of the flow characteristics can be selected according to the requirements of the use occasion.

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