Two way water regulating valve is used to regulate the flow, pressure and liquid level of medium. According to the signal of the regulating position, the opening of the valve is automatically controlled to adjust the medium flow, pressure and liquid level. The regulating valve is divided into electric regulating valve, pneumatic regulating valve and hydraulic regulating valve. The two-way water regulating valve is composed of electric actuator or pneumatic actuator and regulating valve. The regulating valve is usually divided into straight through single seat regulating valve and straight through double seat regulating valve. The latter has the characteristics of large circulation, small imbalance and stable operation. Therefore, the two-way water control valve is usually especially suitable for occasions with large flow, high pressure drop and small leakage. Flow CV is one of the main parameters for selecting regulating valve.

The flow of two-way water regulating valve is defined as: when the regulating valve is fully open, the pressure difference at both ends of the valve is 0.1MPa, and the fluid density is 1g / cm3. The flow number of the regulating valve per hour is called flow, also known as flow coefficient, expressed by CV in t / h, and the CV value of liquid is calculated according to the following formula. The nominal diameter DN of the two-way water regulating valve can be determined according to the CV value of the circulating capacity. 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 when the pressure difference at both ends of the regulating valve remains unchanged. There are three flow characteristics of regulating valve: linear characteristic, equal percentage characteristic and parabolic characteristic.

The meanings of three injection characteristics of two-way water regulating valve are as follows: equal percentage characteristics (logarithm) the relative stroke and relative flow of equal percentage characteristics are not linear. The flow change caused by the change of unit stroke at each point of stroke is directly proportional to the flow at that point, and the percentage of flow change is equal. Therefore, its advantage is that when the flow is small, the flow change is small, and when the flow is large, the flow change is large, that is, it has the same adjustment accuracy under different opening degrees. Linear feature the relative stroke and relative flow of the linear feature are in a linear relationship. The flow change caused by the change of unit stroke is constant.

When the flow of two-way water regulating valve is large, the relative value of flow changes little, while when the flow is small, the relative value of flow changes greatly. Parabolic characteristic flow varies proportionally according to both sides of the stroke, with intermediate characteristics of linear and equal percentage characteristics. From the analysis of the above three characteristics, it can be seen that in terms of its regulation performance, the equal percentage characteristic is the best, the regulation is stable and the regulation performance is good. Parabolic characteristic is better than linear characteristic in regulation performance, so any flow characteristic can be selected according to different requirements of application.

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