Self-temperature control valve (cast) a detailed description of self-operated temperature control valve without external energy and automatically adjust the temperature. It is suitable for steam, hot water, hot oil for a variety of heat transfer medium conditions. Widely used in heating, air conditioning, domestic hot water temperature is automatically adjusted, and the special conditions of the thermostat, such as chemical, textile, pharmaceutical and other production projects. How it works: Self-operated temperature control valve using a liquid thermal expansion and incompressible liquid principle automatic adjustment. Expansion of the liquid temperature sensor inside the uniform, the control action to proportional control. When accused of medium temperature, temperature of liquid volume in the sensor with the expansion or contraction. When accused of medium temperature higher than the set value, the temperature of liquid expansion, pushing down the valve to close the valve, reducing the flow of heat medium; temperature controlled medium is less than the set value, the temperature of liquid contraction, promote the return spring Open the valve to increase the flow of heat medium. Siemens temperature control valve consists of: 1>: controller with a PI, PID adjustment function, precise control, multi-loop control, versatile, enabling fluid flow, pressure, pressure, temperature, humidity, air quality and enthalpy control. 2> actuators: electro-mechanical and electro-hydraulic, with manual and automatic adjustment, adjust the sensitivity, turn off power, flow characteristics adjustable (linear percentage, etc.). Electro-hydraulic actuators with power protection automatic reset function, can receive signal 0-10V or 4-20MA and with valve position feedback. 3> valves: Siemens valve for the single-seat reversing valve, threaded or flanged body made of bronze, brass, gray iron, ductile iron, cast steel, diameter DN10 ... DN150, medium temperature -25 ... 350 degrees Celsius. Suitable for loop piping chilled water, low pressure hot water, hot water, high pressure hot water, sea water, hot oil, and steam regulation, good linearity, adjustable ratio, sealed tight, high temperature resistant, anti-cavitation. In short, according to different use conditions of users, choose cost-effective, appropriate and reliable valve series. Siemens temperature control valve 5 major characteristics: a, for different site conditions, the flexibility to adjust the control parameters to achieve system optimization. b, by the controller reads the current temperature value and observe the valve working condition. c, scalable features such as remote setting, temperature compensation, over-temperature alarm, day and night / winter conversion. d, the valve sealed with V-ring temperature sealing components and prevent the possibility of stem-lock or leaking. e, stem or seat lapped to ensure that leakage is far below national standards allow. Source: http: //www.sddexin.com/ Siemens temperature control valve