Regulating valve, also known as control valve, in the field of industrial automation process control, by accepting the control signal output from the control unit, by means of power operation to change the final control element of the process parameters such as medium flow, pressure, temperature, liquid level. It usually consists of an actuator and a valve. The regulating valve is suitable for air, water, steam, various corrosive media, mud, oil and other media. 

Classification:
According to the characteristics of the stroke, the regulating valve can be divided into straight stroke and angular stroke;
According to the power used by the actuator, it can be divided into three types: pneumatic regulating valve, electric regulating valve and hydraulic regulating valve;
According to its function and characteristics, there are three types: linear characteristics, equal percentage characteristics and parabolic characteristics.

Examples of Regulating valves: The classic STEVI®-Your economical control valve

Some important valve related to regulating valves:

CV:
The flow capacity Cv value is one of the main parameters of the regulating valve selection.
The flow capacity of the regulating valve is defined as: when the regulating valve is fully open, the pressure difference between the two ends of the valve is 0.1 MPa, and the fluid density is 1 g/cm3, hourly. The flow rate of the flow path regulating valve is called the flow capacity, also called the flow coefficient, expressed in Cv, and the unit is t/h, and the Cv value of the liquid is calculated by the following formula.
According to the table of the flow capacity Cv value, the nominal diameter DN of the regulating valve can be determined.

KV:
The flow coefficient Kv of the regulating valve is an important parameter of the regulating valve, which reflects the ability of the regulating valve to pass the fluid, that is, the capacity of the regulating valve. According to the calculation of the regulating valve flow coefficient Kv, it is possible to determine the diameter of the selection regulating valve. In order to correctly select the diameter of the regulating valve, the rated flow coefficient Kv of the regulating valve must be correctly calculated. The rated flow coefficient Kv of the regulating valve is defined as: under the specified conditions, that is, the pressure difference between the two ends of the valve is 10 Pa, the density of the fluid is lg/cm, and the flow rate through the regulating valve at m/h or t/h during the rated stroke number.


The flow coefficient Kv of the regulating valve is an important parameter of the regulating valve, which reflects the ability of the regulating valve to pass the fluid, that is, the capacity of the regulating valve. According to the calculation of the regulating valve flow coefficient Kv, it is possible to determine the diameter of the selection regulating valve. In order to correctly select the diameter of the regulating valve, the rated flow coefficient Kv of the regulating valve must be correctly calculated. The rated flow coefficient Kv of the regulating valve is defined as: under the specified conditions, that is, the pressure difference between the two ends of the valve is 10 Pa, the density of the fluid is lg/cm, and the flow rate through the regulating valve at m/h or t/h during the rated stroke number.The flow coefficient Kv of the regulating valve is an important parameter of the regulating valve, which reflects the ability of the regulating valve to pass the fluid, that is, the capacity of the regulating valve. According to the calculation of the regulating valve flow coefficient Kv, it is possible to determine the diameter of the selection regulating valve. In order to correctly select the diameter of the regulating valve, the rated flow coefficient Kv of the regulating valve must be correctly calculated. The rated flow coefficient Kv of the regulating valve is defined as: under the specified conditions, that is, the pressure difference between the two ends of the valve is 10 Pa, the density of the fluid is lg/cm, and the flow rate through the regulating valve at m/h or t/h during the rated stroke number.The flow coefficient Kv of the regulating valve is an important parameter of the regulating valve, which reflects the ability of the regulating valve to pass the fluid, that is, the capacity of the regulating valve. According to the calculation of the regulating valve flow coefficient Kv, it is possible to determine the diameter of the selection regulating valve. In order to correctly select the diameter of the regulating valve, the rated flow coefficient Kv of the regulating valve must be correctly calculated. The rated flow coefficient Kv of the regulating valve is defined as: under the specified conditions, that is, the pressure difference between the two ends of the valve is 10 Pa, the density of the fluid is lg/cm, and the flow rate through the regulating valve at m/h or t/h during the rated stroke number.The flow coefficient Kv of the regulating valve is an important parameter of the regulating valve, which reflects the ability of the regulating valve to pass the fluid, that is, the capacity of the regulating valve. According to the calculation of the regulating valve flow coefficient Kv, it is possible to determine the diameter of the selection regulating valve. In order to correctly select the diameter of the regulating valve, the rated flow coefficient Kv of the regulating valve must be correctly calculated. The rated flow coefficient Kv of the regulating valve is defined as: under the specified conditions, that is, the pressure difference between the two ends of the valve is 10 Pa, the density of the fluid is lg/cm, and the flow rate through the regulating valve at m/h or t/h during the rated stroke number.