Siemens electric three-way temperature control valve is a typical application of flow control valve in the field of temperature control. Its basic principle: by controlling the heat exchanger, air conditioning unit or other hot and cold equipment, primary heat (cold) medium inlet flow, to achieve Control device outlet temperature.
Siemens electric three-way temperature control valve is a typical application of flow control valve in the field of temperature control. Its basic principle: by controlling the heat exchanger, air conditioning unit or other hot and cold equipment, primary heat (cold) medium inlet flow, to achieve Control device outlet temperature. When the load changes, the flow rate is adjusted by changing the valve opening degree to eliminate the influence of the load fluctuation and return the temperature to the set value.
First, the product overview
1 Introduction
Siemens electric three-way temperature control valve is a special application of electric control valve in the field of temperature control; Siemens electric three-way temperature control valve is composed of German SIEMENS original controller, actuator, sensor and flow regulating valve.
--- Actuator is mechanical and electro-hydraulic, with adjustable adjustment, large shut-off force, adjustable flow characteristics (linear or equal percentage), and power-off protection.
---The valve body is a flow regulating valve with good linearity, large adjustable ratio, tight sealing, high temperature resistance and anti-cavitation.
--- Flexible controller function combinations also enable fluid flow, pressure, differential pressure, temperature, enthalpy and air quality control.
--- For the automatic control of the differential pressure bypass of the main circuit of the return system, it is another typical application of the electric control valve.
Second, the application area
1. Heating system heat exchanger or heat exchanger unit
2, domestic hot water system
3, air conditioning water / wind system
4. Thermal temperature control for production process
Third, product advantages
1. Different on-site working conditions, the control parameters can be flexibly adjusted to optimize the system.
2. Through calculus calculation, predict the temperature change trend in advance and control the temperature accurately.
3. The current temperature value can be read by the controller and the working state of the valve can be observed.
4, scalable functions, such as temperature compensation, remote settings, day and night and winter and summer conversion, maximum priority, cascade control, over temperature alarm, remote communication, central monitoring, etc., energy saving, security.
5. The household can choose the circuit breaker protection function according to the requirements, and the valve will automatically close when the power is off.
6, to achieve a variety of intelligent energy-saving operation mode, unattended, cost-effective.
Fourth, Siemens temperature control valve selection knowledge
1. The valve material, flow capacity and actuator shut-off force should be selected according to the type of heat medium (steam/hot water), temperature, pressure parameters and working conditions (heat exchanger type, open/close system).
2. For steam flow control, it generally refers to saturated steam of 98% dryness. In the case of superheated steam, it is generally necessary to recalculate the check due to the change in the steam adiabatic index k and the change in the flow rate due to the viscosity coefficient of the fluid.
3. The medium flow rate and the pressure difference between the front and the back of the valve are in a square root relationship. Excessive pressure difference not only produces noise, but also causes cavitation on the valve body, affecting the service life. The lighter seal is not strict, and the heavy one may explode, causing serious accidents such as casualties.
4. Excellent temperature regulation curve is the guarantee to achieve temperature control effect. In addition to the special requirements of the fast heat system, the valve should be guaranteed to be equal percentage or parabolic.
5. The electric temperature control valve can not be used as a stop valve for a long time. Close when shutting down
6. The two-way valve must not be used as a three-way valve by removing the valve base blind plate.
7. Use equipment manufactured by third parties to be matched with Siemens products, and pay attention to safety requirements.
8. The temperature control valve is not available for direct water supply system. It must be added with circulation. If it is a hot heat exchanger, it is necessary to add a heat storage tank.
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