Pilot-operated type plug forming valve

Abstract

The utility model relates to the technical field of valve bodies, and discloses a pilot-operated type plug forming valve which is characterized in that a first cavity is formed in a valve shell, a second cavity is formed below the first cavity, a connecting pipe is connected between the first cavity and the second cavity in an inserted mode, and a lower pressing plate is installed at the end, located in the first cavity, of the connecting pipe; a screw hole is formed in the upper side of the first cavity, a screw tube is arranged in the screw hole, an edge sleeve is installed outside the screw tube, an upper pressing plate is installed at the lower end, located in the first cavity, of the screw tube, an extension tube is installed on the lower side of the upper pressing plate, and a spring is arranged on the peripheral side of the extension tube in a sleeving mode. Through the design, when the elastic potential energy of the spring is gradually weakened, the spiral pipe is driven to rotate in the screw hole by rotating the edge sleeve, so that the spiral pipe moves downwards to drive the upper pressing plate to extrude the spring, the elastic potential energy is compensated through extrusion of the spring, and then the service life of the valve body is prolonged; and the operation and maintenance cost of the valve body is reduced.

Description

Technical Field

[0001] This utility model relates to the field of valve body technology, specifically to a pilot-operated plug valve. Background Technology

[0002] A pilot-operated thrombus valve is a special type of valve that senses changes in fluid parameters (such as pressure and flow rate) through a pilot chamber and then precisely controls the opening and closing of the main valve. Its core function is to form a stable thrombus structure in the pipeline through fluid dynamics design, so as to achieve fluid separation, flow regulation or emergency shut-off. This valve is widely used in the petroleum, chemical, energy and industrial automation fields, and performs particularly well in high-pressure, high-back-pressure or safety-critical control scenarios.

[0003] Traditional pilot-operated throttling valves commonly face the core challenge of elastic element failure: under high-frequency opening and closing conditions, the elastic decay caused by spring metal fatigue is irreversible. When performance deteriorates, the valve must be shut down to replace the spring assembly, and this passive maintenance method significantly increases operation and maintenance costs. Therefore, those skilled in the art have provided a pilot-operated throttling valve to solve the problems mentioned in the background art. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a pilot-operated plug valve to solve the problem that under high-frequency opening and closing conditions, the elastic decay caused by spring metal fatigue is irreversible, and when the performance deteriorates, the machine needs to be stopped to replace the spring assembly. This passive maintenance method significantly increases the operation and maintenance costs.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a pilot-operated plug valve, comprising a valve body, a first chamber being formed inside the valve body, a second chamber being formed below the first chamber, a connecting pipe being inserted between the first chamber and the second chamber, a lower pressure plate being installed at one end of the connecting pipe inside the first chamber, a baffle plate being installed at one end of the connecting pipe inside the second chamber, a screw hole being formed on the upper side of the first chamber, a screw tube being provided inside the screw hole, a rib sleeve being installed on the outside of the screw tube, an upper pressure plate being installed at the lower end of the screw tube inside the first chamber, an extension tube being installed on the lower side of the upper pressure plate, and a spring being sleeved around the periphery of the extension tube.

[0008] Preferably, the first chamber and the second chamber are connected, and an annular groove is provided on the bottom side of the first chamber. An air outlet pipe is connected to one side of the annular groove, and a one-way valve is installed in the air outlet pipe.

[0009] Preferably, an air inlet is provided on the bottom side of the second chamber.

[0010] Preferably, the extension tube has a through hole on its peripheral sidewall, and the extension tube and the connecting tube are slidably connected. When the pilot-operated automatic plug valve is not open, compressed air can enter through the spiral tube. Part of the compressed air enters the second chamber through the spiral tube, the extension tube, and the connecting tube, while the other part of the compressed air remains in the first chamber through the through hole on the extension tube. When the pressure in the second chamber is greater than the elastic force of the spring in the first chamber, the baffle plate drives the connecting tube and the upper pressure plate to rise, so that the compressed air is discharged through the annular groove and the outlet pipe after passing through the one-way valve. When the pressure of the incoming compressed air increases, since the area of ​​the baffle plate is larger than that of the lower pressure plate, the thrust of the compressed air on the baffle plate is greater than the downward elastic force of the spring, and the lower pressure plate rises significantly, so that most of the compressed air is discharged through the annular groove and the outlet pipe.

[0011] Preferably, the screw tube is threadedly connected to the screw hole.

[0012] Preferably, the upper end of the spring is in contact with the upper pressure plate, and the lower end of the spring is in contact with the lower pressure plate. The prism sleeve can drive the screw tube to rotate in the screw hole, causing the screw tube to move downward and drive the upper pressure plate to compress the spring. In this way, the elastic potential energy is compensated by the compression of the spring, thereby extending the service life of the valve body.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, this utility model provides a pilot-operated plugging valve, which has the following advantages:

[0015] Through design, this practical pilot-operated plug valve includes a valve body. The valve body has a first chamber and a second chamber arranged from top to bottom, which are connected. A threaded hole is formed on the upper side of the first chamber, and a threaded tube is connected to the threaded hole. A rib is installed on the outer wall of the threaded tube, dividing the threaded part into upper and lower parts. One part is used for pipe connection, and the other part is used for connection to the valve body. An upper pressure plate is installed at the bottom end of the threaded tube, and an extension tube is connected to the bottom end of the upper pressure plate. A spring is fitted around the periphery of the extension tube. The first chamber and the second chamber... A connecting pipe is installed between the two chambers. An upper pressure plate is installed at one end of the connecting pipe in the first chamber, and the upper pressure plate is in contact with the spring. A baffle plate is installed at one end of the connecting pipe in the second chamber, and the extension pipe at the bottom of the upper pressure plate is inserted into the connecting pipe. When the elastic potential energy of the spring gradually weakens, the rotating sleeve drives the screw tube to rotate in the screw hole, causing the screw tube to move downward and drive the upper pressure plate to compress the spring. This compression of the spring compensates for the elastic potential energy, thereby extending the service life of the valve body and reducing the maintenance cost of the valve body. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a pilot-operated plug valve provided in an embodiment of this application.

[0017] Figure 2 This is a structural cross-sectional view of the valve shell in a pilot-operated plug valve provided in an embodiment of this application.

[0018] Figure 3 This is a cross-sectional view of the solenoid in a pilot-operated plug valve provided in an embodiment of this application.

[0019] In the diagram: 1. Valve housing; 101. First chamber; 1011. Annular groove; 1012. Screw hole; 102. Second chamber; 1021. Air inlet; 2. Air outlet pipe; 3. One-way valve; 4. Screw pipe; 401. Ribbon sleeve; 402. Upper pressure plate; 403. Extension pipe; 4031. Through hole; 5. Spring; 6. Connecting pipe; 601. Lower pressure plate; 602. Baffle plate. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] This utility model provides a technical solution: a pilot-operated plug valve, including a valve body 1, a first chamber 101 inside the valve body 1, a second chamber 102 below the first chamber 101, a connecting pipe 6 inserted between the first chamber 101 and the second chamber 102, a lower pressure plate 601 installed at one end of the connecting pipe 6 inside the first chamber 101, and a baffle plate 602 installed at the other end of the connecting pipe 6 inside the second chamber 102, a screw hole 1012 on the upper side of the first chamber 101, a screw tube 4 disposed inside the screw hole 1012, and a rib sleeve 401 installed on the outside of the screw tube 4. 4. An upper pressure plate 402 is installed at the lower end of the first chamber 101. An extension tube 403 is installed on the lower side of the upper pressure plate 402. A spring 5 is sleeved around the extension tube 403. The screw tube 4 is threadedly connected to the screw hole 1012. The upper end of the spring 5 is in contact with the upper pressure plate 402, and the lower end of the spring 5 is in contact with the lower pressure plate 601. The screw tube 4 can be rotated in the screw hole 1012 through the prism sleeve 401, so that the screw tube 4 moves downward and drives the upper pressure plate 402 to squeeze the spring 5. Thus, the elastic potential energy is compensated by the compression of the spring 5, thereby extending the service life of the valve body.

[0022] The first chamber 101 and the second chamber 102 are connected. An annular groove 1011 is formed on the bottom side of the first chamber 101, and an outlet pipe 2 is connected to one side of the annular groove 1011. A one-way valve 3 is installed inside the outlet pipe 2. An air inlet 1021 is formed on the bottom side of the second chamber 102. A through hole 4031 is formed on the peripheral wall of the extension pipe 403. The extension pipe 403 is slidably inserted into the connecting pipe 6. When the pilot-operated automatic valve is not open, compressed air can enter through the screw pipe 4. Part of the compressed air enters through the screw pipe 4, the extension pipe 403, and the connecting pipe 6 into the second chamber 102, while the other part of the compressed air... The through hole 4031 on the extension tube 403 remains in the first chamber 101. When the pressure in the second chamber 102 is greater than the elastic force of the spring 5 in the first chamber 101, the baffle plate 602 drives the connecting tube 6 and the upper pressure plate 402 to rise, so that the compressed air is discharged from the annular groove 1011 into the outlet pipe 2 after passing through the one-way valve 3. When the pressure of the incoming compressed air increases, since the area of ​​the baffle plate 602 is larger than that of the lower pressure plate 601, the pushing force of the compressed air on the baffle plate 602 is greater than the downward elastic force of the spring 5. The lower pressure plate 601 rises significantly, so that most of the compressed air is discharged through the annular groove 1011 and the outlet pipe 2.

[0023] This practical pilot-operated plug valve includes a valve body 1. The valve body 1 has a first chamber 101 and a second chamber 102 arranged from top to bottom. The first chamber 101 and the second chamber 102 are connected. An annular groove 1011 is provided at the bottom of the first chamber 101. One side of the annular groove 1011 is connected to the air outlet pipe 2 on one side of the valve body 1. A one-way valve 3 is provided in the air outlet pipe 2 so that the air outlet pipe 2 only acts to release air. An air inlet 1021 is provided at the bottom of the second chamber 102.

[0024] A screw hole 1012 is opened on the upper side of the first chamber 101. The screw hole 1012 is internally threaded to the screw tube 4. A rib sleeve 401 is installed on the outer wall of the screw tube 4 to divide the thread on the outer wall of the screw tube 4 into two parts, one part for pipe connection and the other part for connection with valve body 1. An upper pressure plate 402 is installed at the bottom end of the screw tube 4. An extension tube 403 is connected to the bottom end of the upper pressure plate 402. A through hole 4031 is opened on the outer wall of the extension tube 403, and a spring 5 is sleeved on the periphery of the extension tube 403. A connecting tube 6 is provided between the first chamber 101 and the second chamber 102. The upper pressure plate 402 is installed at the end of the connecting tube 6 in the first chamber 101. The upper pressure plate 402 is pressed and contacted with the spring 5. A baffle plate 602 is installed at the end of the connecting tube 6 in the second chamber 102, and the extension tube 403 at the bottom end of the upper pressure plate 402 is inserted into the connecting tube 6.

[0025] When the pilot-operated automatic valve is not open, compressed air can enter through the solenoid 4. Part of the compressed air enters the second chamber 102 through the solenoid 4, extension pipe 403 and connecting pipe 6, while the other part of the compressed air is retained in the first chamber 101 through the through hole 4031 on the extension pipe 403. When the pressure in the second chamber 102 is greater than the elastic force of the spring 5 in the first chamber 101, the baffle 602 drives the connecting pipe 6 and the upper pressure plate 402 to rise, so that the compressed air is discharged from the annular groove 1011 into the outlet pipe 2 after passing through the check valve 3.

[0026] When the pressure of the incoming compressed air increases, since the area of ​​the baffle plate 602 is larger than that of the lower pressure plate 601, the thrust of the compressed air on the baffle plate 602 is greater than the downward elastic force of the spring 5, and the lower pressure plate 601 rises significantly, so that most of the compressed air is discharged through the annular groove 1011 and the air outlet pipe 2.

[0027] Due to the frequent use of the valve body, the elastic potential energy of the spring 5 will gradually weaken. The screw tube 4 can be rotated in the screw hole 1012 by the prism sleeve 401, so that the screw tube 4 moves downward and drives the upper pressure plate 402 to squeeze the spring 5. In this way, the elastic potential energy is compensated by the compression of the spring 5, thereby extending the service life of the valve body.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] In this document, unless otherwise expressly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise expressly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pilot operated plug valve comprising a valve housing (1) characterised in that: The valve shell (1) is provided with a first chamber (101), a second chamber (102) is arranged below the first chamber (101), a connecting pipe (6) is inserted between the first chamber (101) and the second chamber (102), a lower pressing plate (601) is arranged at one end of the connecting pipe (6) in the first chamber (101), a blocking plate (602) is arranged at the other end of the connecting pipe (6) in the second chamber (102), a screw hole (1012) is arranged on the upper side of the first chamber (101), a screw pipe (4) is arranged in the screw hole (1012), a rib sleeve (401) is arranged on the outer side of the screw pipe (4), an upper pressing plate (402) is arranged at the lower end of the screw pipe (4) in the first chamber (101), an extension pipe (403) is arranged on the lower side of the upper pressing plate (402), and a spring (5) is sleeved on the circumferential side of the extension pipe (403).

2. A pilot operated plug valve according to claim 1 wherein: The first chamber (101) and the second chamber (102) are communicated, an annular groove (1011) is arranged on the bottom side of the first chamber (101), and a gas outlet pipe (2) is communicated with one side of the annular groove (1011); the one-way valve (3) is arranged in the gas outlet pipe (2).

3. A pilot operated plug valve according to claim 1 wherein: The screw pipe (4) is screwed into the screw hole (1012).

4. A pilot operated plug valve according to claim 1 wherein: The extension pipe (403) is provided with a through hole (4031) on the circumferential wall, and the extension pipe (403) is slidably inserted into the connecting pipe (6).

5. A pilot operated plug valve according to claim 1 wherein: The upper end of the spring (5) is in extrusion contact with the upper pressing plate (402), and the lower end of the spring (5) is in extrusion contact with the lower pressing plate (601).

6. A pilot operated plug valve according to claim 1 wherein: The bottom side of the second chamber (102) is provided with an air inlet hole (1021).

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