Device and method for standard stroke regulation of a pneumatic cartridge valve

Abstract

The application relates to a device and a method for standard stroke adjustment of a pneumatic sleeve type regulating valve, which comprises a gas source, a pressure reducing valve, a first connecting pipe, a second connecting pipe, a gas pressure gauge and a stroke measuring device. The gas inlet end of the pressure reducing valve is connected with the gas source through the first connecting pipe, the gas outlet end of the pressure reducing valve is connected with the diaphragm head of an actuator through the second connecting pipe, the gas pressure gauge is installed between the pressure reducing valve and the diaphragm head, and the stroke measuring device is used for measuring the stroke of the valve rod of the actuator. Compared with the prior art, the application can quickly and accurately complete the standard stroke adjustment of the valve by adjusting the standard stroke of the valve through the stroke adjustment of the actuator, can ensure that the flow characteristics of the regulating valve meet the design requirements, can match the preset valve control parameters in the control system, can ensure that the corresponding relationship between the flow capacity and the valve core / valve rod stroke does not change, and can make the whole system or even the whole unit run stably.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of maintenance and repair of pneumatic sleeve type regulating valves, and particularly relates to a device for standard stroke adjustment of a pneumatic sleeve type regulating valve and a regulating method. BACKGROUND

[0002] The pneumatic sleeve type regulating valve changes the internal flow area of the regulating valve by controlling the air intake of the pneumatic diaphragm actuator, thereby completing the flow regulation of the medium in the pipeline. The main structure includes an actuator and a regulating mechanism. The actuator includes a diaphragm head and an actuator valve rod, etc. The diaphragm head includes a diaphragm, a spring, a diaphragm cover, etc. The regulating mechanism includes a valve body, a valve core, a valve cage (sleeve), an upper valve cover, a valve rod and packing, etc. The valve internals use a valve core and a sleeve. The sleeve is provided with an opening. The valve rod drives the valve rod to move, thereby driving the valve core to move in the sleeve. The sleeve opening meets the required flow capacity and flow characteristics.

[0003] However, in order to save the cost of mold opening, some valve manufacturers use the same size sleeve for valves with different flow capacities and flow characteristics, and then open different size windows on the sleeve to meet different flow requirements. Such a design often results in the size of the sleeve being much larger than the size of the window on the sleeve.

[0004] For the sleeve type regulating valve, the valve core can move in the entire sleeve, and this moving stroke is the maximum stroke of the valve. Only when the valve core moves in the window of the sleeve, the flow characteristics can meet the design requirements and can match the valve control parameters preset in the control system. This moving stroke is defined by the manufacturer as the standard stroke of the valve. Therefore, for the sleeve type regulating valve, the standard stroke has practical significance.

[0005] However, in actual maintenance and repair of the valve, the staff often directly connects the valve and the actuator, controls the actuator to work, and drives the switch of the valve with the maximum stroke of the valve. The actuator will drive the switch of the valve with the maximum stroke of the valve, and will not adjust the stroke of the valve to the standard stroke. Once the standard stroke is exceeded, the flow characteristics of the valve do not meet the design requirements, and the corresponding relationship between the flow capacity and the stroke of the valve core / valve rod is changed. Ultimately, the valve control parameters in the control system do not match the flow characteristics of the valve, the control performance is poor, the controlled object is uncontrollable, and in severe cases, it will cause harm to the safe operation of the entire system and the entire unit. Therefore, the standard stroke adjustment of the pneumatic sleeve type regulating valve is needed after maintenance.

[0006] However, in the prior art, the standard stroke adjustment is generally performed when the regulating valve is shipped, and special adjusting tools and adjusting methods are used, but the cost is high, and obviously it is not suitable for the standard stroke adjustment of the regulating valve after daily maintenance. SUMMARY

[0007] The present application aims to overcome the defects of the prior art and provides a device and method for standard stroke adjustment of a pneumatic sleeve type regulating valve.

[0008] The object of the present application can be achieved by the following technical solutions:

[0009] A device for standard stroke adjustment of a pneumatic sleeve type regulating valve, comprising a gas source, a pressure reducing valve, a first connecting pipe, a second connecting pipe, a gas pressure gauge, and a stroke measuring device.

[0010] The gas inlet end of the pressure reducing valve is connected to the gas source through the first connecting pipe, the gas outlet end of the pressure reducing valve is connected to the diaphragm head of the actuator through the second connecting pipe, the opening degree of the pressure reducing valve is used to change the stroke of the valve stem of the actuator, the gas pressure gauge is installed between the pressure reducing valve and the diaphragm head, and the stroke measuring device is used to measure the stroke of the valve stem of the actuator.

[0011] Preferably, the pressure regulating range of the pressure reducing valve is 0-7 bar.

[0012] Preferably, it further comprises a straight-through sleeve joint, and the first connecting pipe is connected to the pressure reducing valve through the straight-through sleeve joint.

[0013] Preferably, it further comprises two quick connectors, one end of the second connecting pipe is connected to the pressure reducing valve through a quick connector, and the other end is connected to the diaphragm head of the actuator through a quick connector.

[0014] Preferably, the second connecting pipe is a soft pipe made of polytetrafluoroethylene.

[0015] Preferably, the diameter of the second connecting pipe is 8 mm, and the length dimension ranges from 1 to 2 m.

[0016] Preferably, the stroke measuring device is a scale.

[0017] Preferably, the stroke measuring device comprises a scale and a mounting seat, the mounting seat is used to fix the scale, the mounting seat is provided with a clamping part, and the clamping part is used to clamp the scale.

[0018] Preferably, the clamping part comprises a cross arm, a fixing block, a limiting block, and a limiting bolt and a limiting nut, the fixing block and the limiting block are installed on the cross arm, the limiting block moves linearly along the cross arm, the fixing block and the limiting block are provided with positioning holes, and the limiting bolt passes through the positioning holes of the fixing block and the limiting block and is locked by the limiting nut.

[0019] Preferably, the opposite inner sides of the fixing block and the limiting block are provided with elastic layers, and the elastic layers are provided with anti-skid lines.

[0020] A regulating method based on the device for regulating the standard stroke of a pneumatic sleeve type regulating valve, for regulating the standard stroke of a pneumatic sleeve type regulating valve, comprises the following steps:

[0021] S1, the air source is connected to the air inlet end of the pressure reducing valve through the first connecting pipe, the air outlet end of the pressure reducing valve is connected to the diaphragm head of the actuator through the second connecting pipe, and the pressure gauge is installed between the pressure reducing valve and the diaphragm head;

[0022] S2, the pressure reducing valve is adjusted to keep the valve closed, and the actuator valve rod is disconnected from the valve rod;

[0023] S3, the pressure reducing valve is adjusted to fully open the actuator valve rod, and the stroke of the actuator valve rod is the smallest at this time;

[0024] S4, the pressure reducing valve is adjusted to slowly extend the actuator valve rod, the stroke of the actuator valve rod is measured through the stroke measuring device, and when the stroke of the actuator valve rod is equal to the standard stroke of the pneumatic sleeve type regulating valve when the valve is closed, the actuator valve rod is kept stationary;

[0025] S5, the actuator valve rod and the valve rod are connected, and the standard stroke adjustment is completed.

[0026] Compared with the prior art, the present application has the following beneficial effects:

[0027] (1) A device for regulating the standard stroke of a pneumatic sleeve type regulating valve is provided, which can conveniently regulate the stroke of the actuator valve rod and accurately measure the stroke of the actuator valve rod during the regulation process, providing tool support for the regulation of the standard stroke of the regulating valve, so that the staff can conveniently regulate the standard stroke of the pneumatic sleeve type regulating valve.

[0028] (2) The application provides a standard stroke adjustment method of a pneumatic sleeve type regulating valve, which adjusts the standard stroke of the valve by controlling the stroke of an actuator, and can quickly and accurately complete the adjustment of the standard stroke of the valve. Through the method, the flow characteristics of the regulating valve can meet the design requirements, and can be matched with the preset valve control parameters in the control system, the corresponding relationship between the flow capacity and the stroke of the valve core / valve rod is not changed, the controlled object is controllable, the regulating valve is stable, and thus the whole system and even the whole unit are stable.

[0029] (3) The connection between components is realized through a quick connector and a straight-through sleeve type connector, and the air tightness and quick connection of the connection can be ensured.

[0030] (4) The stroke measuring device is designed with a scale and a clamping part, so that the clamping of the scale can be conveniently realized, the accuracy of stroke measurement is improved, and the workload of workers is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 Fig. 1 is a structural schematic view of a standard stroke adjustment device;

[0032] Figure 2 Fig. 2 is a use schematic view of the standard stroke adjustment device;

[0033] Figure 3 Fig. 3 is a structural schematic view of a clamping part;

[0034] Fig. 1 is a structural schematic view of a standard stroke adjustment device; DETAILED DESCRIPTION

[0035] The application will be described in detail below in combination with the drawings and specific embodiments. The embodiments are implemented on the premise of the technical scheme of the application, and detailed implementation modes and specific operation processes are given, but the protection scope of the application is not limited to the following embodiments.

[0036] In the drawings, components with the same structure are denoted by the same reference numerals, and components with similar structures or functions are denoted by similar reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the application does not limit the size and thickness of each component. In order to make the drawings clearer, the cooperation relationship between the components is shown, and the components are appropriately scaled and the distance between the components is increased or decreased in some places in the drawings.

[0037] In the description of the embodiments of the present application, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0038] In addition, the terms "first", "second", "third", etc. are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0039] In the description of the embodiments of the present application, it should be further noted that unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] Embodiment 1:

[0041] A device for standard stroke adjustment of a pneumatic sleeve type regulating valve, as shown in Figure 1 The device comprises a gas source 1, a pressure reducing valve 2, a first connecting pipe 3, a second connecting pipe 4, a gas pressure gauge, and a stroke measuring device.

[0042] The gas inlet end of the pressure reducing valve 2 is connected with the gas source 1 through the first connecting pipe 3, the gas outlet end of the pressure reducing valve 2 is connected with the diaphragm head 7 of the actuator through the second connecting pipe 4, the opening degree of the pressure reducing valve 2 is used to change the stroke of the valve rod 8 of the actuator, the gas pressure gauge is installed between the pressure reducing valve 2 and the diaphragm head 7, and can display the real-time gas pressure; the stroke measuring device is used to measure the stroke of the valve rod 8 of the actuator.

[0043] The gas source 1 is selected as a common compressed air source 1, the pressure adjusting range of the pressure reducing valve 2 is 0-7 bar, the gas inlet end of the pressure reducing valve 2 is a straight-through sleeve joint 5 of M8, the first connecting pipe 3 is connected with the pressure reducing valve 2 through the straight-through sleeve joint 5, the gas outlet end of the pressure reducing valve 2 is a quick connector 6 of M8, the second connecting pipe 4 is a plastic hose made of polytetrafluoroethylene, with a diameter of 8 mm and a length size range of 1-2 m, and the gas inlet of the diaphragm head 7 of the actuator is a quick connector 6 of M8, one end of the second connecting pipe 4 is connected with the pressure reducing valve 2 through the quick connector 6, and the other end is connected with the diaphragm head 7 of the actuator through the quick connector 6.

[0044] Some control valves are equipped with a scale at the factory to measure the valve stem stroke. However, after prolonged use, the scale may become deformed, or the graduations may be obscured by dust, oil, or paint applied during refurbishment, rendering the scale unusable. Therefore, this application provides a stroke measuring device to measure the stroke of the actuator valve stem 8.

[0045] In one embodiment, the stroke measuring device is a ruler, and the stroke of the actuator valve stem 8 can be measured by holding the ruler by hand.

[0046] In one embodiment, the stroke measuring device includes a scale 10 and a mounting base. The mounting base, used to fix the scale 10, can be a separate bracket placed upright next to the regulating valve, or it can be mounted on the regulating valve's bracket, base, or diaphragm head 4 via a connector. The mounting base is provided with a clamping part for clamping the scale 10. For example... Figure 3 As shown, the clamping part includes a horizontal arm 11, a fixing block 12, a limiting block 13, a limiting bolt, and a limiting nut. The fixing block 12 and the limiting block 13 are mounted on the horizontal arm 11. The limiting block 13 moves linearly along the horizontal arm 11. The fixing block 12 and the limiting block 13 are provided with positioning holes. The limiting bolt passes through the positioning holes on the fixing block 12 and the limiting block 13 and is locked by the limiting nut. In use, one end of the scale 10 is placed between the fixing block 12 and the limiting block 13, and then the limiting block 13 is moved so that the scale 10 is clamped between the fixing block 12 and the limiting block 13. In order to ensure the clamping effect, there are at least two limiting bolts located on both sides of the scale 10. The limiting bolts pass through the fixing block 12 and the limiting block 13, and then the limiting bolts are locked by the limiting nut, thereby completing the clamping of the scale 10. The mounting base ensures that the position of the scale 10 remains unchanged throughout the entire use, guaranteeing the measurement accuracy of the valve stem 8 stroke of the actuator. Furthermore, it eliminates the need for the operator to hold the scale 10 continuously, saving effort. An elastic layer is provided on the opposing inner surfaces of the fixing block 12 and the limiting block 13 to prevent damage to the scale 10 due to clamping force. The elastic layer also features anti-slip textures to further prevent the scale 10 from slipping.

[0047] This application provides a device for adjusting the standard stroke of a pneumatic sleeve-type control valve, which supports the adjustment of the standard stroke of the pneumatic sleeve-type control valve. The operator can adjust the stroke of the actuator valve stem 8 through the pressure reducing valve 2, measure the stroke of the actuator valve stem 8 through the stroke measuring device, and read the pressure value in real time through the barometer, thereby making the adjustment of the standard stroke of the pneumatic sleeve-type control valve more convenient.

[0048] One adjustment method involves using the aforementioned standard stroke adjustment device to adjust the standard stroke of a pneumatic sleeve-type control valve, such as... Figure 2As shown, in particular, the method comprises the following steps:

[0049] S1, the gas source 1 is connected to the inlet end of the pressure reducing valve 2 through the first connecting pipe 3, the outlet end of the pressure reducing valve 2 is connected to the diaphragm head 7 of the actuator through the second connecting pipe 4, and a gas pressure gauge is installed between the pressure reducing valve 2 and the diaphragm head 7;

[0050] S2, adjust the pressure reducing valve 2 to keep the pneumatic sleeve type regulating valve in a closed state, disconnect the actuator valve rod 8 from the valve rod 9;

[0051] S3, adjust the pressure reducing valve 2 to fully open the actuator valve rod 8, at this time the stroke of the actuator valve rod 8 is the smallest;

[0052] S4, adjust the pressure reducing valve 2 to slowly extend the actuator valve rod 8, measure the stroke of the actuator valve rod 8 through the stroke measuring device, and keep the actuator valve rod 8 stationary when the stroke of the actuator valve rod 8 is equal to the standard stroke of the actuator valve rod 8 when the pneumatic sleeve type regulating valve is closed;

[0053] S5, connect the actuator valve rod 8 and the valve rod 9, and complete the adjustment of the standard stroke.

[0054] It can be understood that the standard stroke of the actuator valve rod 8 when the pneumatic sleeve type regulating valve is closed can be measured in advance by the stroke measuring device, the actuator full opening position is a dead point, i.e. the minimum point of the stroke of the actuator valve rod 8, the actuator full opening position is both the maximum stroke valve full opening position and the standard stroke valve full opening position, and the strokes of the actuator valve rod 8 corresponding to the standard stroke valve closed position and the maximum stroke valve closed position are different, for example, the stroke of the actuator valve rod 8 is 2 cm when reaching the standard stroke valve closed position, and the stroke of the actuator valve rod 8 is 4 cm when reaching the maximum stroke valve closed position. Accordingly, the standard stroke adjustment of the pneumatic sleeve type regulating valve can be performed.

[0055] For the gas closed type actuator, the adjustment method is as follows:

[0056] (1) connect the gas source 1 to the inlet end of the pressure reducing valve 2 through the first connecting pipe 3, connect the outlet end of the pressure reducing valve 2 to the diaphragm head 7 of the actuator through the second connecting pipe 4, install a gas pressure gauge between the pressure reducing valve 2 and the diaphragm head 7, and display the pressure reading in real time to facilitate the operator to understand the pressure condition;

[0057] (2) open the pressure reducing valve 2 to control the diaphragm head 7 of the actuator to enter the gas, close the valve to keep the valve in a closed position, and disconnect the actuator valve rod 8 from the valve rod 9;

[0058] (3) exhaust the gas in the gas chamber of the diaphragm head 7 of the actuator through the pressure reducing valve 2 to fully open the actuator valve rod 8, at this time the stroke of the actuator valve rod 8 is the smallest;

[0059] (4) Slowly open the pressure reducing valve 2, so that the membrane head 7 gas chamber of the actuator slowly inhales, measure the stroke of the actuator stem 8 through the stroke measuring device, slowly close the actuator stem 8 to the length corresponding to the standard stroke (the standard stroke of the actuator stem 8 when the valve of the pneumatic sleeve type regulating valve is closed), and keep the actuator stem 8 still;

[0060] (5) Connect the actuator stem 8 and the valve stem 9, at this time the position of the valve is the zero position of the standard stroke, open the actuator stem 8 again, at this time the position of the valve is the full position of the standard stroke, and the adjustment of the standard stroke is completed.

[0061] For the air opening type actuator, the adjustment method is as follows:

[0062] (1) Connect the gas source 1 to the gas inlet end of the pressure reducing valve 2 through the first connecting pipe 3, connect the gas outlet end of the pressure reducing valve 2 to the membrane head 7 of the actuator through the second connecting pipe 4, install a gas pressure gauge between the pressure reducing valve 2 and the membrane head 7, and display the pressure reading in real time, so that the operator can understand the pressure situation;

[0063] (2) Close the pressure reducing valve 2 and keep the valve closed, so that the valve remains closed, and disconnect the actuator stem 8 and the valve stem 9;

[0064] (3) Open the pressure reducing valve 2, so that the actuator stem 8 is fully opened, at this time the stroke of the actuator stem 8 is the smallest;

[0065] (4) Slowly release the gas in the membrane head 7 gas chamber of the actuator through the pressure reducing valve 2, measure the stroke of the actuator stem 8 through the stroke measuring device, slowly close the actuator stem 8 to the length corresponding to the standard stroke (the standard stroke of the actuator stem 8 when the valve of the pneumatic sleeve type regulating valve is closed), and keep the actuator stem 8 still;

[0066] (5) Connect the actuator stem 8 and the valve stem 9, at this time the position of the valve is the zero position of the standard stroke, open the actuator stem 8 again, at this time the position of the valve is the full position of the standard stroke, and the adjustment of the standard stroke is completed.

[0067] The preferred embodiments of the application are described in detail above. It should be understood that those skilled in the art can make many modifications and changes without creative labor based on the concept of the present application. Therefore, any technical solutions obtained by logical analysis, reasoning or limited experiments based on the prior art according to the concept of the present application shall be within the protection scope determined by the claims.

Claims

1. A method for adjusting a standard stroke adjustment device for a pneumatic sleeve-type regulating valve, characterized in that, The regulating device includes an air source, a pressure reducing valve, a first connecting pipe, a second connecting pipe, a barometer, and a stroke measuring device; The inlet of the pressure reducing valve is connected to the air source through the first connecting pipe, and the outlet of the pressure reducing valve is connected to the diaphragm head of the actuator through the second connecting pipe. The opening degree of the pressure reducing valve is used to change the stroke of the actuator valve stem. The barometer is installed between the pressure reducing valve and the diaphragm head. The stroke measuring device is used to measure the stroke of the actuator valve stem. The adjustment method includes the following steps: S1. The air source is connected to the air inlet of the pressure reducing valve through the first connecting pipe, and the air outlet of the pressure reducing valve is connected to the diaphragm head of the actuator through the second connecting pipe. A pressure gauge is installed between the pressure reducing valve and the diaphragm head. S2. Adjust the pressure reducing valve to keep the pneumatic sleeve-type regulating valve in the closed state, and disengage the actuator valve stem from the valve stem. S3. Adjust the pressure reducing valve to fully open the actuator valve stem, at which point the actuator valve stem stroke is at its minimum; S4. Adjust the pressure reducing valve to slowly extend the actuator valve stem. Measure the stroke of the actuator valve stem using the stroke measuring device. When the stroke of the actuator valve stem is equal to the standard stroke of the actuator valve stem when the pneumatic sleeve-type regulating valve is closed, keep the actuator valve stem stationary. S5. Connect the actuator stem and the valve stem to complete the adjustment of the standard stroke.

2. The adjustment method for a standard stroke adjustment device for a pneumatic sleeve-type regulating valve according to claim 1, characterized in that, The pressure regulating range of the pressure reducing valve is 0~7 bar.

3. The adjustment method for a standard stroke adjustment device for a pneumatic sleeve-type regulating valve according to claim 1, characterized in that, It also includes a straight-through compression fitting, through which the first connecting pipe is connected to the pressure reducing valve.

4. The adjustment method for a standard stroke adjustment device for a pneumatic sleeve-type regulating valve according to claim 1, characterized in that, It also includes two quick connectors. One end of the second connecting pipe is connected to the pressure reducing valve via a quick connector, and the other end is connected to the diaphragm head of the actuator via a quick connector.

5. The adjustment method for a standard stroke adjustment device for a pneumatic sleeve-type regulating valve according to claim 1, characterized in that, The second connecting pipe is a flexible tube made of polytetrafluoroethylene.

6. The adjustment method for a standard stroke adjustment device for a pneumatic sleeve-type regulating valve according to claim 1, characterized in that, The second connecting pipe has a diameter of 8mm and a length ranging from 1 to 2m.

7. The adjustment method for a standard stroke adjustment device for a pneumatic sleeve-type regulating valve according to claim 1, characterized in that, The travel measuring device is a ruler.

8. The adjustment method for a standard stroke adjustment device for a pneumatic sleeve-type regulating valve according to claim 1, characterized in that, The travel measuring device includes a scale and a mounting base. The mounting base is used to fix the scale and has a clamping part for clamping the scale.

9. The adjustment method for a standard stroke adjustment device for a pneumatic sleeve-type regulating valve according to claim 8, characterized in that, The clamping part includes a horizontal arm, a fixing block, a limiting block, a limiting bolt, and a limiting nut. The fixing block and the limiting block are mounted on the horizontal arm. The limiting block moves linearly along the horizontal arm. The fixing block and the limiting block are provided with positioning holes. The limiting bolt passes through the positioning holes on the fixing block and the limiting block and is locked by the limiting nut.

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