Valve Control Method and Control Terminal

Abstract

A valve control method comprises: configuring a condition for periodically triggering self-cleaning; and when a valve is continuously in an opened or closed state, or a preset time point is reached, repeatedly opening and closing the valve several times within a short period of time, such that dirt on a contact surface of a valve element is automatically removed by means of vertical or rotational movement of the valve element so as to prevent the case in which the valve is in a static state for a long period of time which causes impurities in a pipeline to be deposited on the surface of the valve element, and thereby causing the valve element to jam or have increased movement resistance. In addition, the resilience of mechanical parts such as a spring and a rubber member in the valve is not reduced as a result of the valve being in the closed or opened state for a long period of time, and the flexibility thereof is maintained. Also disclosed is a valve control terminal. In the control method and the control terminal, a valve body does not need to be disassembled, and no hardware needs to be added. The invention is easy to implement, and greatly improves the reliability of a valve.

Claims

1. There is a valve control method, which is characterized in that a trigger condition and a self-cleaning action of the valve are set on a control center or a control terminal connected with the valve; When that condition are met, triggering and complete the self-cleaning action of the valve; The trigger condition refers to that the valve keeps open or closed for n days; N is an integer or decimal number greater than 1; Or the condition refers to reaching a preset time point; Or the condition refers to the time point when the valve is not working after the normal operation is finished.

2. The valve control method according to claim 1, characterized in that the valve self-cleaning action means that the state of the valve is switched from open to closed, or from closed to open once, and then returns to the original state after being switched even times; The valve self-cleaning action is set on the control center or control terminal.

3. The valve control method according to claim 2, characterized in that the opening and closing action of the valve comprises a flexible opening and closing mode; The flexible switching mode means that the valve driving signal adopts positive and negative progressive mode. When the valve is turned from closed to open, the valve opening signal is given first to make the valve core move forward for a certain position, and then the valve closing signal is given to make the valve core move backward for a certain position, repeating for several times, and then opening the valve completely, wherein the forward and reverse movements can pause slightly; And vice versa; Or the flexible switching mode means that the valve driving signal adopts pulse progressive. When the valve is turned from closed to open, first give the valve an opening signal pulse, then interrupt the opening signal, then give the valve an opening signal pulse, and repeat it for several times until the valve is fully opened, and vice versa.

4. The valve control method according to claim 2, which, which is characterized in that the flexible switching mode is adopted only when the driving current of the valve exceeds the set current.

5. The valve control method according to claim 3, characterized in that the parameter setting of the condition is entered by combining a plurality of existing keys on the control terminal or pressing the keys for a long time.

6. The valve control method according to claim 1, characterized in that, in order to avoid sudden change of pipeline flow caused by simultaneous operation of a plurality of valves, a random time parameter s is added to the condition, that is, the self-cleaning action of the valve is triggered by delaying s time after the preset triggering time is reached.

7. The valve control method according to claim 1, characterized in that when the valve is a water valve, the valve self-cleans and triggers the water pump at the same time; Or when the valve is an air valve, the valve self-cleans and triggers the air pump at the same time; When the valve is an oil valve, the valve self-cleans and triggers the oil pump; When the valve is an air valve, the valve self-cleans and triggers the fan at the same time; When the valve is a steam valve, the valve is self-cleaning and the steam source is turned on.

8. The valve control method according to claim 1, characterized in that the control terminal is provided with a network interface, and the control terminal is remotely controlled by a computer to realize parameter setting.

9. A valve self-cleaning control terminal which is connected with a valve and can control the opening and closing of the valve, which is characterized in that the valve self-cleaning control terminal has a valve self-cleaning program and can set self-cleaning triggering conditions and self-cleaning actions; When the self-cleaning condition is met, the valve self-cleaning control terminal drives the valve to make self-cleaning action; The self-cleaning trigger condition means that the valve keeps open or closed for N days; N is an integer or decimal number greater than 1; Or the self-cleaning trigger condition refers to reaching a preset time point; Or the self-cleaning trigger condition refers to the time point when the valve is not working after the normal operation is finished.

10. The valve self-cleaning control terminal according to claim 9, wherein the self-cleaning action means that the state of the valve is switched from open to closed or from closed to open once, and then returns to the original state after being switched even times.

11. The valve self-cleaning control terminal according to claim 9, characterized in that in order to avoid sudden change of pipeline flow caused by simultaneous operation of a plurality of valves, a random time parameter S is added to the self-cleaning triggering condition, that is, the self-cleaning action of the valve is started after the preset starting time reaches.

12. The valve self-cleaning control terminal according to claim 9, characterized in that the valve self-cleaning control terminal is provided with a linkage signal output terminal, and when the valve is a water valve, the linkage signal starts the water pump at the same time; Or when the valve is an air valve, the linkage signal starts the air pump simultaneously; When the valve is an oil valve, the linkage signal starts the oil pump at the same time; When the valve is an air valve, the linkage signal starts the fan at the same time; When the valve is a steam valve, the linkage signal simultaneously turns on the steam source.

13. The valve self-cleaning control terminal according to claim 9-12, characterized in that the valve self-cleaning control terminal is a temperature control terminal and comprises an input module and a display screen, wherein the input module comprises a key.

14. The valve self-cleaning control terminal according to claim 13, characterized in that the keys and the display screen are integrated touch screens.

15. The valve self-cleaning control terminal according to claim 13, which, which is characterized in that the setting of the self-cleaning trigger condition is entered through the combination of a plurality of existing keys on the input module, or by pressing a key for a long time, or by the locking key separately set on the input module.

16. The valve self-cleaning control terminal according to claim 13, characterized in that the input module is provided with a network interface, and self-cleaning triggering conditions and self-cleaning actions are remotely set by a computer.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0119] FIG. 1 is a schematic structural diagram of a temperature control panel;

[0120] FIG. 2 is a schematic diagram of connection between temperature control panel, fan coil and valve.

[0121] Label description: 20—on key, 33—mode key, 22—wind speed key, 23—increase key, 24—decrease key, 32—wind speed icon, 34—indoor temperature icon, 35—set temperature icon, 36—date and time icon, and 31—valve icon.

DETAILED DESCRIPTION OF THE INVENTION

[0122] The invention will be further described in detail with reference to the drawings and specific embodiments.

Embodiment 1

[0123] As shown in FIG. 1 and FIG. 2, a valve self-cleaning device (or temperature control panel) comprises a display screen, operation buttons and an output board, wherein the display screen can display icons of operation modes 33, including cooling, heating and air supply modes and wind speed icons 32, and icons of indoor temperature 34, set temperature 35, date and time 36 and valve 31; Among them, the operation keys include on/off key 20, mode key 21, wind speed key 22, increase key 23 and decrease key 24. With the mode key 21, the temperature control panel can be placed in cooling, heating and air supply modes respectively.

[0124] The output module is electrically connected with the valve of the fan coil unit and the fan, wherein the valve comprises an internal valve core and is connected with the fan coil unit through a water pipe; The electrical connection includes that the output module is directly connected with the valve and the fan, and the output directly drives the valve and the fan; It also includes the output module connected with the driving module of valve and fan through the signal line. At this time, the output module does not directly drive the valve and fan, and the temperature control panel of hotel guest room adopts this mode.

[0125] Further, the operation keys and the display screen can adopt an integrated touch liquid crystal display screen.

[0126] On the basis of the existing functions of the temperature control panel, the valve self-cleaning maintenance function is added, which means that the valve is opened and closed by a periodic time program, and the dirt on the surface of the valve core is removed by the movement of the valve core itself, so as to prevent the hard deposit from being formed on the surface of the valve core due to the long-term static movement of the valve, and keep the valve core flexible.

[0127] The temperature control panel detects that the valve is closed or open for n consecutive days, automatically switches the valve for m times, and then repeats the cycle according to this rule. For example, in the central air conditioning system, the valve is closed for several months in spring and autumn. If n is set to 15 days, it will automatically trigger once every 15 days.

[0128] Or, when the time of the temperature control panel reaches the set time point, the temperature control panel automatically opens and closes the valve for m times immediately. If it is triggered automatically at 12 o'clock on the 1st of each month, the self-cleaning action of the electric water valve will be triggered regardless of whether the air conditioner terminal is running or not; Because the self-cleaning action time is very short, even if the air conditioning terminal is running, the impact on indoor air conditioning can be almost ignored.

[0129] Or the condition means that the valve is triggered at a certain time point when it does not work after a period of normal operation, for example, at 6 pm every day, the self-cleaning action of the electric water valve is triggered after the air conditioner finishes running and shuts down.

[0130] Furthermore, on the basis of the existing mode of the temperature control panel, a temperature locking function which can lock the lowest cooling value and the highest heating value respectively is added. After the manager locks the cooling minimum value under the temperature locking function, when the user adjusts the set temperature in the cooling mode, the set temperature will not decrease after reaching the locked cooling minimum value. After the manager locks the heating maximum value under the temperature locking function, when the user adjusts the set temperature in the heating mode, the set temperature will not rise after reaching the locked heating maximum value, thus preventing the user from setting the temperature too low or too high in the internal program of the temperature control panel.

[0131] Further, the parameter setting of the valve self-cleaning maintenance function and locking temperature function can be entered by any combination of keys on the temperature control panel. After entering, the duration of N days, the number of switches M, the self-cleaning time point, and the locked maximum and minimum temperature values can be set by using the increase key 23, the decrease key 24 and other keys.

[0132] Further, the parameter setting of the valve self-cleaning maintenance function and locking temperature function can be entered by any three key combinations on the temperature control panel, for example, in the power-on state, press the mode key 21 continuously for more than three times within five seconds, and then press the mode key 21 and the add key 23 at the same time.

[0133] Further, the parameter setting of the valve self-cleaning maintenance function and locking temperature function can be entered through the combination operation of any two keys on the temperature control panel, for example, pressing and holding the mode key 21 and the add key 23 for five seconds at the same time; Or press and hold the wind speed key 22 and the increase key 23 for five seconds to enter; Or press the mode key 21 four times continuously, then press the wind speed key 22 four times continuously, or other similar key combinations.

[0134] Further, the parameter setting of the valve self-cleaning maintenance function and locking temperature function is entered by pressing any key on the temperature control panel for a certain period of time (i.e., pressing the mode key 21 continuously for six seconds. Or press and hold the wind speed key 22 continuously for six seconds to enter the temperature locking function; Or press and hold the increase key 23 continuously for six seconds to enter the temperature locking function; Or press and hold the on-off key for 20 seconds continuously to enter the valve self-cleaning maintenance function and locking temperature mode, or other similar key operation methods.

[0135] The valve self-cleaning maintenance function and temperature locking function are operated and used by managers, which are not needed by ordinary air-conditioner users. Through the above-mentioned combined key operation, ordinary air-conditioner users are not allowed to enter the temperature locking function at will, and the complexity of daily air-conditioner operation is not increased.

[0136] After entering the parameter setting of the valve self-cleaning maintenance function, the value displayed in the original set temperature symbol area 35 is continuous days N, and the value displayed in the original indoor temperature symbol area 34 is valve opening and closing times M; Press the mode key 21, and the day N flashes, which is modified by the increase key 23 and the decrease key 24, and confirmed by the wind speed key 22; Press the mode key 21 again, and the switching frequency M flashes, which is modified by the increase key 23 and the decrease key 24 and confirmed by the wind speed key 22; Press the switch key 20 again to exit the valve self-cleaning maintenance function.

[0137] After entering the parameter setting of temperature locking function, the cooling mode symbol and flashing set temperature appear on the display screen at this time, and the value desired by the manager is set by the increase key and the decrease key, and then the wind speed key is pressed to confirm, and the set temperature stops flashing; Press the mode key again to display the heating mode symbol and flashing set temperature, set it to the value desired by the manager through the increase key and the decrease key, then press the wind speed key to confirm, and the set temperature stops flashing. Press the switch button again to exit the setting.

[0138] Furthermore, the operation keys and the display screen can adopt an integrated touch liquid crystal display screen.

[0139] Furthermore, after the temperature control panel exits through the on-off key, the temperature control panel can automatically remember the valve duration N and switching times M set by the manager, and the locked cooling minimum value and heating maximum value, which can be stored continuously and will not be lost due to power failure.

[0140] Furthermore, a random time parameter S is added to the valve self-cleaning maintenance function, and after the temperature control panel detects that the valve is closed or opened for N consecutive days +S, the temperature control panel opens and closes the valve for M times, and the unit of the random time S is minutes, hours or days. In this way, in some specific central air-conditioning systems, thousands of valves in the air-conditioning system can be prevented from opening at the same time at a certain time point, causing impact on the pipeline water system.

[0141] Furthermore, the parameter setting of the valve self-cleaning maintenance function and temperature locking function can also be remotely set by a computer through the network interface of the temperature control panel.

[0142] Adding a random parameter S1 to the time program, wherein the unit of the random parameter S1 is minutes, hours or days; After the temperature control panel detects that the valve is closed for N days +S1, the temperature control panel opens and closes the valve for M times, and then repeats the cycle according to this rule; Or when the time of the temperature control panel reaches the set time point and is delayed by S1, the valve is detected to be in a closed state, and the temperature control panel immediately and automatically opens and closes the valve for M times.

[0143] Adding a random parameter S2 to the time program, wherein the unit of the random parameter S2 is minutes, hours or days; After the temperature control panel detects that the valve is open for N days +S2, the temperature control panel closes and opens the valve for M times, and then repeats the cycle according to this rule; When the time of the temperature control panel reaches the set time point and is delayed by S2, the valve is detected to be in an open state, and the temperature control panel automatically closes and opens the valve for M times immediately.

[0144] Furthermore, the parameter setting of the valve self-cleaning maintenance function and temperature locking function can also be set by a remote controller through an infrared or wireless interface conFig.d on the temperature control panel.

[0145] Furthermore, the temperature control panel can be used not only for fan coils but also for wind cabinets, such as ceiling fresh fans and ceiling wind cabinets.

[0146] Furthermore, the temperature control panel is respectively connected with a cold water valve and a hot water valve, such as a fan coil unit applied to four pipes.

[0147] The valve self-cleaning maintenance function automatically closes when the temperature control panel is in any mode of refrigeration, heating and air supply.

[0148] The difference between Embodiment 2 and Embodiment 1 is that no temperature control panel is used, and the valve is directly electrically connected with the control center, which directly triggers the self-cleaning of the valve.

[0149] Embodiment 3 is different from Embodiment 1 in that every opening and closing action in the self-cleaning action of the valve adopts positive and negative progressive. When the control center or control terminal drives the valve from closed to open, it first gives the valve opening signal to make the valve core move forward for a certain position, then gives the valve closing signal, and the valve core moves backward for a certain position, repeating several times, each time the reverse movement position is smaller than the forward movement position, and then all the valves are opened, with a slight pause between the forward and reverse movements; If the valve action time is 10 seconds, first send out a 5-second opening signal, stop for 1 second, then send out a 2-second closing signal, then stop for 1 second, then send out a 2-second closing signal, then stop for 1 second, finally send out a 4-6-second opening signal, and the valve is fully open; or vice versa, Dallas to the auditorium This method is mainly applicable to valves with positive and negative spool movement.

[0150] The difference between Embodiment 4 and Embodiment 1 is that every opening and closing action in the valve self-cleaning action adopts pulse progressive. When the valve is turned from closed to open, first give the valve an opening signal pulse, then interrupt the opening signal, and then give the valve an opening signal pulse first, and repeat it several times until the valve is fully opened. If the valve action time is 10 seconds, first send out a 3-second opening signal, stop for 1 second, then send out a 3-second opening signal, stop for 1 second, and finally send out a 4-6-second opening signal, and the valve is fully open; or vice versa, Dallas to the auditorium.

[0151] This method is mainly applicable to valves whose valve core is opened when power is on, and whose valve core is closed and reset by spring after power is off. In this way, through the forward movement of power transmission, the power-off spring pushes the reverse movement to realize the flexible opening of the valve core in the opening process.

[0152] Embodiment 5, which is different from Embodiment 1, is that the valve is self-cleaning. By setting a valve driving current detection device on the control terminal, when the valve is opened or closed forward, only the driving current of the valve exceeds the set current, the flexible switching mode is adopted.

[0153] Embodiment 6, which is different from Embodiment 1, is that the valve is used in the gas pipeline system, and at this time, the valve is also called the electric air valve.

[0154] Embodiment 7, which is different from Embodiment 1, is that the valve is used in the oil pipeline system, at which time the valve is also called the electric oil valve.

[0155] Embodiment 8, which is different from Embodiment 1, is that the valve is used in the steam pipeline system, at which time the valve is also called the electric steam valve.

Embodiment 9

[0156] The difference with Embodiment 1 is that the valve flexible action function is added on the basis of the existing functions of the temperature control panel.

[0157] The switch action of the valve driven by the temperature control panel includes flexible switch mode, and the valve action includes flexible switch mode besides conventional direct switch; That is, the valve is opened in a flexible way, or closed in a flexible way, or both valves are opened and closed in a flexible way; Or the flexible switch mode is adopted for each action of the valve, or the flexible switch mode is adopted only for the specific part of the valve. The valve is different from the solenoid valve, and the switching action time is generally more than ten seconds, which makes it possible to realize flexible switching. The flexible action has the following two driving signal modes:

[0158] 1) The driving signal adopts positive and negative gradual way, which first gives the valve opening signal, then sends out the opening signal of t1 seconds to make the valve core move forward for a certain position, and then gives the valve closing signal of t2 seconds. The valve core moves backward for a certain position, repeating H1 times, each time the reverse movement position is smaller than the forward movement position, and then all the valves are opened, in which the forward and reverse movements can be stopped for t3 seconds; And vice versa.

[0159] If the valve action time is 10 seconds, first send out a 5-second opening signal, stop for 1 second, then send out a 2-second closing signal, then stop for 1 second, then send out a 2-second closing signal, then stop for 1 second, finally send out a 4-6-second opening signal, and the valve is fully open. And vice versa; This method is mainly applicable to valves with positive and negative spool movement.

[0160] 2) The driving signal is pulsed. When the valve is closed to open, first give the valve an opening signal pulse for t4 seconds, then interrupt the opening signal for t5 seconds, then give the valve an opening signal pulse for t6 seconds, and repeat it for H2 times until the valve is fully opened, and vice versa.

[0161] If the valve action time is 10 seconds, first send out a 3-second open signal, stop for 1 second, then send out a 3-second open signal, stop for 1 second, and finally send out a 4-6-second open signal, and the valve is fully open. Or vice versa, Dallas to the auditorium.

[0162] This method is mainly applicable to valves whose valve core is opened when power is on, and whose valve core is closed and reset by spring after power is off. In this way, through the forward movement of power transmission, the power-off spring pushes the reverse movement to realize the flexible opening of the valve core in the opening process.

[0163] The purpose of flexible switch mode is to make impurities attached to the surface of the valve core or stuck at the valve core loose by moving back and forth, so as to prevent one-time blocking. Combined with the flow of pipeline water, the loose impurities are washed away and the valve core becomes flexible.

[0164] In addition, trigger conditions for flexible operation can be set, for example, a valve drive current detection circuit is set in the input module, and when the valve operates, only the drive current exceeds the set current can the flexible switch mode be triggered.

[0165] Or keep the valve open or closed for n days; N is an integer or decimal number greater than 1; Or reach a preset time point and trigger flexible action.

[0166] The repetition times H1, H2, positive and negative action time t1-3, pulse time t4-6, etc. in the flexible switch mode can be set by the input module or directly solidified in the control module.

[0167] Parameter setting of valve flexible action can be entered by any combination of keys on the temperature control panel. After entering, the number of repetitions H1, H2, positive and negative action time t1-3 and pulse time t4-6 can be set by adding key 23, decreasing key 24 and other keys.

[0168] Further, the parameter setting can be entered through the combination operation of any three keys on the temperature control panel. For example, in the power-on state, press the mode key 21 continuously for more than three times within five seconds, and then press the mode key 21 and the add key 23 at the same time.

[0169] Further, the parameter setting can be entered by combining any two keys on the temperature control panel, for example, pressing and holding the mode key 21 and the add key 23 for five seconds at the same time; Or press and hold the wind speed key 22 and the increase key 23 for five seconds to enter; Or press the mode key 21 four times continuously, then press the wind speed key 22 four times continuously, or other similar key combinations.

[0170] Further, you can press any key on the temperature control panel for a long time (i.e., press and hold the mode key 21 for six seconds to enter; Or press and hold the wind speed key 22 continuously for six seconds to enter, or other similar key operation methods.

[0171] The valve flexible action setting function is used by the manager, which is not needed by ordinary air-conditioner users. Through the above-mentioned combined key operation in various ways, the ordinary air-conditioner users are not allowed to enter at will, and the complexity of daily air-conditioner operation is not increased.

[0172] After entering the valve flexibility parameter setting, the original set temperature symbol area 35 displays the display area N with time parameters t1-6, and the original indoor temperature symbol area 34 displays the display area with valve action times H1-H2. Press the mode key 21, and the time parameter flashes, which is modified by the increase key 23 and decrease key 24, confirmed by the wind speed key 22, and then pressed the wind speed key 22 to switch the time parameter. Press the mode key 21 again, and the time parameter flashes, which is modified by the increase key 23 and decrease key 24, confirmed by the wind speed key 22, and then press the wind speed key 22 to switch the time parameter; Press the switch key 20 again to exit the valve parameter setting.

[0173] When the temperature control panel is provided with a network interface, the above parameters can be set remotely by a computer.

Embodiment 10

[0174] The difference with Embodiment 1 is that, on the basis of the existing functions of the temperature control panel, a temperature locking function capable of locking the lowest cooling value and the highest heating value is added.

[0175] After the manager locks the cooling minimum value under the temperature locking function, when the user adjusts the set temperature in the cooling mode, the set temperature will not decrease after reaching the locked cooling minimum value. After the manager locks the heating maximum value under the temperature locking function, when the user adjusts the set temperature in the heating mode, the set temperature will not rise after reaching the locked heating maximum value, thus preventing the user from setting the temperature too low or too high in the internal program of the temperature control panel.

[0176] Further, the parameter setting of the locking temperature function can be entered through any key combination operation on the temperature control panel. After entering, the duration of N days, the number of switching times m, the self-cleaning time point, and the locked maximum and minimum temperature values can be set through the increase key 23, the decrease key 24 and other keys.

[0177] Further, the parameter setting of the temperature locking function can be entered through the combination operation of any three keys on the temperature control panel. For example, in the power-on state, press the mode key 21 continuously for more than three times within five seconds, and then press the mode key 21 and the add key 23 at the same time.

[0178] Further, the parameter setting of the locking temperature function can be entered by combining any two keys on the temperature control panel, for example, pressing and holding the mode key 21 and the increase key 23 for five seconds at the same time; Or press and hold the wind speed key 22 and the increase key 23 for five seconds to enter; Or press the mode key 21 four times continuously, then press the wind speed key 22 four times continuously, or other similar key combinations.

[0179] Further, the parameter setting of the locking temperature function is entered by pressing any key on the temperature control panel for a long time (i.e., pressing the mode key 21 for six seconds). Or press and hold the wind speed key 22 continuously for six seconds to enter the temperature locking function; Or press and hold the increase key 23 continuously for six seconds to enter the temperature locking function; Or press and hold the on/off key 20 continuously for six seconds to enter the locked temperature mode, or other similar key operation methods.

[0180] The temperature locking function is operated by the manager, which is not needed by ordinary air-conditioner users. Through the above-mentioned combined key operation, ordinary air-conditioner users are not allowed to enter the temperature locking function at will, and the complexity of daily air-conditioner operation is not increased.

[0181] After entering the parameter setting of the temperature locking function, the cooling mode symbol and flashing set temperature appear on the display screen at this time, and the value desired by the manager is set by the increase key 23 and the decrease key 24, and then the wind speed key 22 is pressed to confirm, and the set temperature stops flashing; Press the mode key again to display the heating mode symbol and flashing set temperature, set it to the value desired by the manager through the increase key 23 and the decrease key 24, then press the wind speed key 22 to confirm, and the set temperature stops flashing. Press the switch button again to exit the setting.

[0182] Furthermore, after the temperature control panel exits through the on-off key, the temperature control panel can automatically remember the locked cooling minimum value and heating maximum value set by the manager, which can be stored continuously and will not be lost due to power failure.

[0183] Furthermore, the parameter setting of the temperature locking function can also be remotely set by a computer through the network interface of the temperature control panel.

[0184] Furthermore, the parameter setting of the temperature locking function can also be set by the remote controller through the infrared or wireless interface conFig.d on the temperature control panel.

[0185] Embodiment 11 is different from Embodiment 1 in that the temperature control panel can be used not only for fan coils but also for air cabinets, such as ceiling fresh fans and ceiling air cabinets.

[0186] Embodiment 12 is different from Embodiment 1 in that the temperature control panel is connected with a cold water valve and a hot water valve respectively, such as a fan coil used in four pipes.

[0187] Embodiment 13 is different from Embodiment 1 in that the opening and closing action of the driving valve of the temperature control panel includes the above-mentioned flexible opening and closing mode, and the temperature control panel also has three functions of the above-mentioned valve self-cleaning maintenance and the above-mentioned temperature locking, or a combination of any two functions.

[0188] Further, the valve body of the valve is a two-way valve or a three-way valve; The valve core is ball valve, globe valve or gate valve.

[0189] There are only preferred embodiments of the present invention above, instead of being used to limit the present invention. Those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention obviously. They all belong to the protection scope of the present invention if these modifications and variations of the present invention fall within the scope of the claims and their equivalent technologies.