Fix a Temperature Control Valve
The temperature control valve referred to as temperature control valve is a typical application of flow control valve in the field of temperature control, its basic principle: is to control the heater control valve, air conditioning units, or other heater core and cooling system equipment, primary heat (cold) medium inlet flow to control the outlet temperature of the equipment. When the load produces changes, adjust the flow rate by changing the valve opening degree, to eliminate the impact caused by load fluctuations, so that the temperature is restored to the set value.
Temperature Control Valve Working Principle.
Radiator thermostatic control valves achieve user room temperature control. Radiator thermostatic control valve is composed of a thermostatic controller, a flow control valve, and a pair of connections, of which the core component of the thermostatic controller is the sensor unit, namely the temperature package.
The temperature package can sense changes in ambient temperature and volume changes, driving the regulating valve spool to produce displacement, and then adjusting the radiator water to change the radiator heat. Additional information：
The thermostatic valve working properly set temperature can be adjusted artificially, the thermostatic valve will automatically control and adjust the radiator hot water and cold water volume according to the set requirements, to achieve control of indoor temperature.
What is The Function of The Thermostatic Valve？
1. Regulate the water temperature.
The primary role of the open-fitting radiator is to regulate the operating temperature, can control the amount of hot water in the water heater, hot water flows more temperature is high, and the flow of less temperature is low, thus preventing the temperature.
2. Split room heating.
The temperature control valve of the open-fitting radiator can freely adjust the size of the hot water flow, and when a home is unoccupied for a long time, the user can close the temperature control valve of the radiator in the room, which can play the role of room heating.
3. Balance water pressure.
At present, China’s temperature control devices, are no longer satisfied with the simple temperature control function, and pay more attention to the overall flow balance of the heating system, to balance the water pressure, to provide users with a more comfortable living environment.
4. Save energy.
Users can use the temperature control valve to adjust and set the temperature according to the requirements of the room temperature. This ensures that the home temperature of individual rooms is constant, avoiding the problems of unbalanced pipeline water and uneven room temperature at the top and bottom of the system. At the same time, the effect of constant temperature control and economic operation can both improve the comfort of the indoor thermal environment and achieve energy savings.
Temperature Control Valve Use Characteristics：
- Easy to install.
- No power supply air source is required.
- Easy to adjust and set.
- Balanced valve core design.
Temperature Control Valve Installation Position
1. Radiator thermostatic valve is generally installed on each radiator inlet pipe or the main inlet pipe of the sub-heating system. In particular, the built-in sensor is not advocated for vertical installation, the valve body and surface piping thermal effects may lead to thermostatic controller error action, which should ensure that the thermostatic valve sensor can sense the city circulating air temperature, prevent covered by curtain boxes, heating hoods, etc.
2. To reduce investment, it is proposed to install only one temperature control valve on the indoor system (one heating system for one household).
How to Troubleshoot The Temperature Controller？
1. Visual inspection and judgment
- Judgment:
XD1 (red), and XD2 (green) indicator lights on the control panel indicate the high-temperature furnace insulation and heating (i.e., power off and on), respectively. Under normal circumstances close K2; oscillation, amplification circuit began to work, relay J suction, light green, and then turn on K1, CJ action, contact suction, such as the green light does not light, the red light is on.
And the ammeter does not indicate, that CJ does no action when the sound. Can be judged that the power supply part of the AC and DC circuit and temperature conversion circuit work normally, the fault may occur in the oscillation, and wave detection, but most of the circuit; If the power is turned on, the high-temperature furnace can be heated, but when the millivolt meter pointer deflection to the predetermined temperature, the green light does not go out, the red light does not light.
High-temperature furnaces continue to add temperature, that is, control failure, you can judge the power supply part of the AC, DC circuit, temperature conversion, detection of three parts of the circuit is normal, while the oscillation and amplification of the two parts of the circuit may fail.
- Checking:
Remove the housing, according to your experience carefully determine the relays, AC contactors, transformers, and other components that have no obvious scorching traces, the terminals, circuit connection wires, components, another place, or details on whether to disconnect or desoldering. Then turn on the power. Use the electric pen to test the above components in turn(have common signs). Connect the input and output terminals of the wire whether there is electricity.
2. Voltage detection
If the instrument has not been detected and eliminated after the above inspection, it is necessary to use the DC voltage block of a multimeter to measure the voltage value of each pole to the ground of the triode BG1 and BG2 respectively. It should meet the listed values. It is very important.
How to Deal with The Failure of The Temperature Control Valve？
A temperature control valve spool can not be closed: the solution means for heater control valves is to increase the pressure of the gas source or adjust the spring preload (that is, reduce the starting pressure outside the gas chamber). The solution to the gas open valve is to increase the spring preload while increasing the origin pressure.
Second, the push rod action is sluggish or non-action: test diaphragm, rolling diaphragm, gasket whether aging, the rupture caused by air leakage. You can stop using it and reinstall it.
Third, the return difference is large: whether the push rod is bent, whether the packing gland is pressed too tight, especially graphite packing, or whether the spool guide is injured. The solution means are to change the stem, and filler, increase the guiding gap and change the strong actuator.
Fourth, the full stroke of the temperature control valve is not enough: loosen the stem connection nut, and the stem is rotated outward or stretched inward. Make the full stroke deviation value exceed the allowed value and then screw the nut.
Fifth, the temperature control valve’s small opening stability is poor: the scene first checks whether the flow is installed in the opposite direction, or the valve is selected too large, the solution is to change the flow open installation, proper direction, reduce the size of the spool or make replacing the old valve.
Sixth, temperature control valve action is not stable: positioner failure, output pipeline leakage, actuator stiffness is too small fluid pressure changes caused by insufficient thrust. The solution is to find the exact location use tools to repair the positioner and pipeline and switch to an actuator with high stiffness.
Seventh, leaking too big: First check whether the sealing surface is injured, whether the thread or screws connecting the valve seat and the valve stem is loose, and whether the differential pressure is greater than the output force of the actuator when the valve is closed. The solution is to replace the sealing surface, tighten the valve seat, and replace the actuator with high output force easier.
Eighth, the oscillation phenomenon: is due to the valve being in a small open working or flow direction for the flow closed type. The solution manner is to avoid small open work and change the flow of open-type work easier.
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