The temperature control valve can be generally divided into: self-operated temperature control valve and electric temperature control valve. Self-operated temperature control valve realizes automatic adjustment by using the principle of liquid expansion by heat and incompressibility of liquid. The liquid expansion in the temperature sensor is uniform, and its control function is proportional regulation. When the temperature of the controlled medium changes, the volume of the temperature-sensing liquid in the sensor expands or contracts with it. When the temperature of the controlled medium is higher than the set value, the temperature-sensing liquid expands, pushing the spool down to close the valve, reducing the flow of the heating medium; when the temperature of the controlled medium is lower than the set value, the temperature-sensing liquid shrinks, and the return spring pushes The valve core opens, increasing the flow of heat medium. Electric thermostatic valves are typical applications in temperature control fields such as HVAC. The controller has PI, PID adjustment functions, precise control, multi-loop control, and diverse functions, which can realize the control of fluid flow, pressure, differential pressure, temperature, humidity, enthalpy and air quality. The actuators are electro-mechanical and electro-hydraulic, with manual and automatic adjustment functions, sensitive adjustment, large closing force, and adjustable flow characteristics (linear equal percentage). Electro-hydraulic actuator with automatic reset protection function when power off, can receive 0-10V or 4-20MA signal and has valve position feedback function. The valve body is a flow control valve, which is suitable for circulating pipelines of chilled water, low-pressure hot water, domestic hot water, high-pressure hot water, seawater, hot oil, and steam. The regulation has good linearity, large adjustable ratio, tight sealing, and high temperature resistance. Anti-cavitation.
