The regulating valve, also known as the control valve, is a device in the process control system that uses power operation to change the medium flow. The International Electrotechnical Commission's IEC defines a control valve as a terminal element formed by a power-operated device in an industrial process control system. It includes a valve assembly with a component that changes the flow rate of the process fluid. The valve member is in turn connected to one or more actuators that are responsive to signals from the control member. It can be seen that the regulating valve is composed of two parts: the actuator and the valve part. The actuator is the actuator of the regulating valve. According to the corresponding thrust of the signal pressure, the actuator produces a corresponding displacement, which drives the spool of the regulating valve. The valve part is the regulating part of the regulating valve. It directly contacts with the medium, and the throttle area of ​​the regulating valve is changed through the displacement of the actuator rod to achieve the purpose of regulation.
Regulators are divided into three categories: pneumatic control valves, electric control valves, and hydraulic control valves, depending on their energy sources. The difference lies in the compensated actuators. Pneumatic control valve is powered by compressed air and is equipped with a pneumatic actuator. The electric control valve uses electricity as a power source and is equipped with an electric actuator. The hydraulic control valve uses hydraulic pressure. As a power source, it is equipped with a hydraulic actuator.
Traditional valves <br> <br> globe valves shown in FIG. 2-64 through single-seat control valve commonly used pneumatic. It consists of valve body, valve seat, valve core, guide sleeve, valve cover, stem and packing. The valve plug and the valve stem are connected together, and the connection method may be fixed by an interference fit pin or a threaded connection pin, or the valve plug and the valve rod may be integrally formed, and a guide sleeve is arranged between the valve cover and the valve body to up and down the valve core. Move plays a guiding role. The small hole in the guide sleeve communicates with the body cavity of the valve body and the outlet end of the valve. The medium of the upper cavity of the guide sleeve easily flows into the outlet end of the valve through the small hole, and does not affect the movement of the valve core.
Regulators are divided into three categories: pneumatic control valves, electric control valves, and hydraulic control valves, depending on their energy sources. The difference lies in the compensated actuators. Pneumatic control valve is powered by compressed air and is equipped with a pneumatic actuator. The electric control valve uses electricity as a power source and is equipped with an electric actuator. The hydraulic control valve uses hydraulic pressure. As a power source, it is equipped with a hydraulic actuator.
Traditional valves <br> <br> globe valves shown in FIG. 2-64 through single-seat control valve commonly used pneumatic. It consists of valve body, valve seat, valve core, guide sleeve, valve cover, stem and packing. The valve plug and the valve stem are connected together, and the connection method may be fixed by an interference fit pin or a threaded connection pin, or the valve plug and the valve rod may be integrally formed, and a guide sleeve is arranged between the valve cover and the valve body to up and down the valve core. Move plays a guiding role. The small hole in the guide sleeve communicates with the body cavity of the valve body and the outlet end of the valve. The medium of the upper cavity of the guide sleeve easily flows into the outlet end of the valve through the small hole, and does not affect the movement of the valve core.
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