Electric control Valve (electric control valve) Electric control valve industrial automation process control is an important unit of execution instrumentation. As the degree of automation in the industrial field is getting higher and higher, it is being used more and more in various industrial fields. Compared with the traditional pneumatic control valve has obvious advantages: energy saving (consumption of electricity only during work), environmental protection (non-carbon emissions), quick and easy installation (without complex pneumatic pipe and pump workstations). The structure of the electric control valve by the electric actuator and the control valve connected to the assembly after the mechanical connection assembly, commissioning and installation constitute the electric control valve. The working principle of electric control valve Working power supply: DC24V, AC220V, AC380V and other voltage levels. By receiving industrial automation and control system signals (such as: 4 ~ 20mA) to drive the valve to change the size of the cross-section between the valve core and valve seat control flow media, temperature, pressure and other process parameters. Automatic adjustment function. Introduction to the flow characteristics of the electric control valve The flow characteristics of the electric control valve is the relationship between the relative flow of the medium through the electric control valve and its opening under the condition that the pressure difference between the two ends of the valve is kept constant. Flow characteristics of electric control valve are: linear characteristics, such as percentage characteristics and parabolic characteristics of three. Electric control valve is widely used in electric power, chemical, metallurgy, environmental protection, water treatment, light industry, building materials and other industrial automation systems. Electric control valve installation Electric control valve is most suitable for installation as a working piston in the lower part of the horizontal pipeline. Temperature sensor can be installed in any position, the entire length must be immersed in the controlled medium. Electric control valve generally includes a drive, the drive signal (0-10V or 4-20MA) to control the valve to adjust, but also according to control needs, the composition of intelligent network control system, the optimal control of remote monitoring. Electric control valve similar products and electric control valve function is similar to: self-regulating valve. Self-operated control valve without external energy, by adjusting the set point control temperature. As the temperature rises, the valve closes proportionally to changes in temperature. Self-operated control valve includes a control valve and a thermostat (including a temperature sensor, a set point regulator, a capillary and a working piston), electric actuators rely on the choice of different temperature conditions. The thermostatic valve operates on the principle of liquid expansion. If the temperature on the sensor increases, the liquid fill will heat and expand at the same time. The valve is closed by the working piston and the medium will be cooled down. By setting the point key can be adjusted step by step, electric two-way valve can be read on the ruler. All thermostats are equipped with an over-temperature safety protection device.
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