CN217463408U - Governing valve time delay control system - Google Patents
Governing valve time delay control system Download PDFInfo
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- CN217463408U CN217463408U CN202221495771.9U CN202221495771U CN217463408U CN 217463408 U CN217463408 U CN 217463408U CN 202221495771 U CN202221495771 U CN 202221495771U CN 217463408 U CN217463408 U CN 217463408U
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Abstract
The utility model relates to a governing valve time delay control system, the valve locator inlet end is connected with the air supply, the valve locator outlet end is connected with the position-keeping valve, the position-keeping valve is connected with the governing valve, the air supply is connected with two-position three-way solenoid valve and check valve, the two-position three-way solenoid valve outlet end is connected with the pressure measurement switching-over valve and is connected with the position-keeping valve, the pressure measurement switching-over valve is connected with two-position three-way pneumatic control valve; the air inlet end of the two-position three-way pneumatic control valve is connected with the air outlet end of the position-keeping valve through a pipeline, the air outlet end of the two-position three-way pneumatic control valve is connected with a speed control valve, a pneumatic time delay device is arranged on a pipeline, leading to the two-position three-way pneumatic control valve, of the pressure-measuring reversing valve, the air outlet end of the one-way valve is connected with an air storage tank, the air storage tank is connected with the pressure-measuring reversing valve, and a control coil circuit of the two-position three-way electromagnetic valve is connected with an electronic switch. The utility model discloses a synergism of pressure measurement switching-over valve, pneumatic time delay unit can ensure that when the 4-20mA signal of telecommunication trouble or the air feed pressure trouble of input appear, the governing valve keeps the normal position earlier, then slowly opens until full open.
Description
Technical Field
The utility model belongs to the technical field of governing valve control technique and specifically relates to a governing valve time delay control system.
Background
With the continuous improvement of manufacturing processes in the petrochemical industry, the requirements on valves used by various devices are stricter, and especially the safety control requirements of regulating valves are gradually refined and clear.
The main purpose of the control is to meet the requirements of special control processes of field processes, such as chemical reaction, when a gas source or a signal is cut off, a regulating valve cannot be directly opened, otherwise, a large amount of media is easily lost to cause waste of chemical raw materials, the reaction time needs to be kept in situ, the buffer time for processing faults is provided for the field, and the safety and reliability of production are ensured.
The present regulating valves generally need to fulfill the following safety control requirements: when the regulating valve has an electric signal failure or air supply pressure failure of 4-20mA, the regulating valve performs the following sequential actions: 1. the regulating valve is firstly kept in the original position for 60 seconds (the time within the range of 5-120 seconds can be set according to requirements); 2. when the original position is kept for the set time, the regulating valve begins to be opened slowly, the time from full closing to full opening of the regulating valve is 60 seconds (the time in the range of 5-120 seconds can be set according to requirements), and the process is difficult to realize by the conventional normal regulation control.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: in order to overcome the defects in the prior art, the utility model provides a regulating valve time delay control system to ensure that the regulating valve is stably opened when an input 4-20mA electric signal fault or an air supply pressure fault occurs.
The utility model provides a technical scheme that its technical problem adopted is: a time delay control system of a regulating valve is provided with an air source, a valve positioner and a position-keeping valve, wherein the air inlet end of the valve positioner is connected with the air source, the air outlet end of the valve positioner is connected with the position-keeping valve, the air outlet end of the position-keeping valve is connected with the regulating valve, a two-position three-way electromagnetic valve and a one-way valve are connected on an air source pipeline in front of the air inlet end of the valve positioner, the air outlet end of the two-position three-way electromagnetic valve is connected with a pressure-measuring reversing valve and is connected with the position-keeping valve, and the pressure-measuring reversing valve is connected with a two-position three-way air control valve; the air inlet end of the two-position three-way pneumatic control valve is connected with the air outlet end of the position-keeping valve through a pipeline, the air outlet end of the two-position three-way pneumatic control valve is connected with a speed control valve, and a pneumatic time delay device is arranged on a pipeline of the pressure measurement reversing valve leading to the two-position three-way pneumatic control valve; the air outlet end of the one-way valve is connected with an air storage tank, and the air storage tank is connected with a pressure measuring reversing valve; and a control coil circuit of the two-position three-way electromagnetic valve is connected with an electronic switch.
And a filtering pressure reducing valve is arranged on an air outlet pipeline of the air source so as to filter and reduce pressure of input air.
The utility model has the advantages that: the utility model discloses a synergism of pressure measurement switching-over valve, pneumatic time delay unit can ensure that when the 4-20mA signal of telecommunication trouble or the air feed pressure trouble of input appear, the governing valve keeps the normal position earlier, then slowly opens until full open, can realize the control operation to the special technological process of petrochemical product, simplifies the control process, saves the cost, guarantees the reliability of production.
Drawings
The present invention will be further described with reference to the accompanying drawings and embodiments.
Fig. 1 is a schematic view of the structural principle of the present invention.
In the figure: 1. the system comprises a filter pressure reducing valve, 2 a valve positioner, 3 a position retaining valve, 4 a speed control valve, 5 a two-position three-way pneumatic control valve, 6 an adjusting valve, 7 a pneumatic delayer, 8 a two-position three-way electromagnetic valve, 9 a pressure measuring reversing valve, 10 an air storage tank, 11 a one-way valve, 12 an electronic switch and 13 an air source.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
As shown in figure 1, the regulating valve delay control system is provided with an air source 13, a valve positioner 2 and a position-keeping valve 3, an air outlet pipeline of the air source 13 is provided with a filtering pressure reducing valve 1, air coming out of an air outlet end of the filtering pressure reducing valve 1 is divided into three paths, one path of air is connected with an air inlet end of the valve positioner 2, the other path of air is connected with a two-position three-way electromagnetic valve 8, the other path of air is connected with a one-way valve 11, a control coil line of the two-position three-way electromagnetic valve 8 is connected with an electronic switch 12, and an air outlet end of the one-way valve 11 is connected with an air storage tank 10.
The valve positioner 2 give vent to anger the end and be connected with the valve 3 of keeping, keep valve 3 to give vent to anger end and connect governing valve 6 all the way, keep valve 3 to give vent to anger another way and be connected with two tee bend gas accuse valves 5, two tee bend gas accuse valves 5 give vent to anger the end and be connected with speed control valve 4.
One path of the air outlet end of the two-position three-way electromagnetic valve 8 is connected with a pressure measuring reversing valve 9, the other path of the air outlet end of the two-position three-way electromagnetic valve is connected with a position keeping valve 3, one path of the pressure measuring reversing valve 9 is connected with a pneumatic delayer 7, the other path of the pressure measuring reversing valve is connected with an air storage tank 10, and the pneumatic delayer 7 is connected with a two-position three-way air control valve 5.
When the gas pressure regulating valve works normally, gas input by a gas source 13 enters a valve positioner 2, a two-position three-way electromagnetic valve 8 and a one-way valve 11 after being filtered by a filtering and pressure reducing valve 1 and pressure is set, when a signal of the valve positioner 2 is normal, an electronic switch 12 outputs voltage to the two-position three-way electromagnetic valve 8 to enable an IN port and an OUT port to be communicated, the gas enters a position retaining valve 3 and a pressure measuring reversing valve 9 after passing through the two-position three-way electromagnetic valve 8, when the gas input by the gas source is normal, the IN1 port and the OUT port of the pressure measuring reversing valve 9 are communicated, the gas directly enters a gas storage tank 10, when the signal port of the position retaining valve 3 has gas, the gas is input and output to be communicated, the gas enters a gas chamber of a regulating valve 6 and the two-position three-way gas control valve 5 through the position retaining valve 3, because the two-position three-way pneumatic control valve 5 has no signal gas, the port P and the port E of the two-position three-way pneumatic control valve 5 are communicated, the port E is plugged by a plug, and when the electric signal 4-20mA of the valve positioner 2 changes, the normal regulation and control of the regulating valve 6 can be realized.
When 24-20mA signal failure occurs IN the valve positioner 2, gas output by a gas source enters the valve positioner 2, the two-position three-way electromagnetic valve 8 and the one-way valve 11 after being filtered by the filtering and reducing valve 1 and pressure setting, no voltage is output from the electronic switch 12 because a 4-20mA electric signal of the valve positioner 2 fails, the OUT port of the two-position three-way electromagnetic valve 8 is communicated with the atmosphere, no signal gas source exists IN the position maintaining valve 3 and the pressure measuring and reversing valve 9, the position maintaining is realized by the valve, the IN2 port and the OUT port of the pressure measuring and reversing valve 9 are communicated, the gas IN the gas storage tank 10 enters the pneumatic delayer 7 through the pressure measuring and reversing valve 9, the pneumatic delayer 7 sets the position maintaining time to be 60s, when the position maintaining time reaches 60s, the gas is communicated and output to the signal port of the two-position three-way air control valve 5, the P port and the A port of the two-position three-way air control valve 5 are communicated, the gas IN the gas chamber of the regulating valve 6 enters the speed control valve 4 through the two-position three-way air control valve 5, the time from full-off to full-on of the valve is set by the speed control valve 4 for 60 s.
When the gas source has a fault, the position-keeping valve 3 and the pressure-measuring reversing valve 9 both have no signal gas, the valve realizes position keeping, an IN2 port and an OUT port of the pressure-measuring reversing valve 9 are communicated, the gas IN the gas storage tank 10 enters the pneumatic delayer 7 through the pressure-measuring reversing valve 9, the pneumatic delayer 7 sets the position-keeping time to be 60s, when the position-keeping time reaches 60s, the gas is communicated and output to a signal port of the two-position three-way pneumatic control valve 5, at the moment, a P port and an A port of the two-position three-way pneumatic control valve 5 are communicated, the gas IN a gas chamber of the regulating valve 6 enters the speed control valve 4 through the two-position three-way pneumatic control valve 5, and the time from full closing to full opening of the valve is set to be 60s through the speed control valve 4.
The utility model discloses a synergism of pressure measurement switching-over valve 9, pneumatic time delay 7 can ensure when appearing inputing 4-20mA signal of telecommunication trouble or air feed pressure trouble, and governing valve 6 keeps the normal position earlier, then slowly opens until full open, can realize the control operation to the special technological process of petrochemical product, simplifies control process, saves the cost, guarantees the reliability of production.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (2)
1. The utility model provides an governing valve time delay control system, has air supply (13), valve locator (2) and protects position valve (3), and air supply (13) are connected to valve locator (2) inlet end, and valve locator (2) are given vent to anger to hold and are connected with protecting position valve (3), and it holds connection governing valve (6), characterized by to protect position valve (3) to give vent to anger: a two-position three-way electromagnetic valve (8) and a one-way valve (11) are connected to a pipeline of an air source (13) in front of the air inlet end of the valve positioner (2), the air outlet end of the two-position three-way electromagnetic valve (8) is connected with a pressure measuring reversing valve (9) and is connected with the position keeping valve (3), and the pressure measuring reversing valve (9) is connected with a two-position three-way air control valve (5); the air inlet end of the two-position three-way pneumatic control valve (5) is connected with the air outlet end of the position-keeping valve (3) through a pipeline, the air outlet end of the two-position three-way pneumatic control valve (5) is connected with a speed control valve (4), and a pneumatic time delay device (7) is arranged on a pipeline of the pressure measuring reversing valve (9) leading to the two-position three-way pneumatic control valve (5); the air outlet end of the one-way valve (11) is connected with an air storage tank (10), and the air storage tank (10) is connected with a pressure measuring reversing valve (9); and a control coil circuit of the two-position three-way electromagnetic valve (8) is connected with an electronic switch (12).
2. The regulator valve delay control system of claim 1, wherein: and a filtering pressure reducing valve (1) is arranged on an air outlet pipeline of the air source (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221495771.9U CN217463408U (en) | 2022-06-15 | 2022-06-15 | Governing valve time delay control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221495771.9U CN217463408U (en) | 2022-06-15 | 2022-06-15 | Governing valve time delay control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217463408U true CN217463408U (en) | 2022-09-20 |
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ID=83237809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221495771.9U Active CN217463408U (en) | 2022-06-15 | 2022-06-15 | Governing valve time delay control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217463408U (en) |
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2022
- 2022-06-15 CN CN202221495771.9U patent/CN217463408U/en active Active
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