A pneumatic drain valve

Abstract

The utility model relates to valve technical field, concretely relates to a pneumatic trap, including valve body, the both sides of valve body are provided with input chamber and output chamber respectively, the valve body is provided with cut -off chamber along the oblique, cut -off chamber gradually is close to output chamber along from top to bottom direction, and the bottom of output chamber and cut -off chamber is linked together, and output chamber is set up on valve body along horizontal direction, the valve seat is provided in cut -off chamber, the top of valve seat is provided with sleeve, the sleeve is provided with valve rod, the bottom of valve rod is provided with valve flap, and the upper middle part of valve rod is from valve body and is worn, the top of valve body is provided with guide seat, and the side of guide seat is installed on valve rod, and the other side of guide seat is provided with sleeve hole, and the sleeve hole is provided with guide rod, and the side of guide rod away from valve rod is provided with bolt, and the upper guide rod is provided with pneumatic actuator, the utility model provides a kind of to improve the stability of medium delivery, avoid the influence of gas source fluctuation to the pneumatic trap of valve control.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a pneumatic steam trap. Background Technology

[0002] Valves are devices used in pipeline systems to control the flow of media such as water, steam, and oil / gas. Their main functions are to connect or disconnect media, control media flow / pressure, change fluid direction, and protect pipelines and equipment, playing a crucial role in pipeline systems. Pneumatic steam traps are widely used in various pipeline systems due to their reliable performance and their role in providing isolation in systems with high nuclear-grade requirements. A pneumatic steam trap is a valve that uses compressed air as a power source to achieve its drainage function. Compressed air is delivered through pipelines to the valve, where actuators such as cylinders and diaphragms drive the valve stem to move, quickly opening or closing the media delivery channel to rapidly complete the drainage operation and ensure the normal operation of the pipeline system. For operating environments where the steam medium temperature reaches 630℃, pneumatic steam traps must be able to withstand harsh conditions of high temperature and high pressure. This places extremely high demands on the high-temperature resistance, mechanical strength, and sealing performance of the materials, while preventing the leakage of high-temperature, high-pressure steam to ensure the efficient and stable operation of the entire pipeline system.

[0003] A pneumatic steam trap mainly consists of a pneumatic actuator and a valve assembly. The valve assembly includes a valve body, valve seat, valve disc, and valve stem. The valve body contains a media delivery chamber. The valve seat and valve disc are assembled within the valve chamber. The tight fit between the valve disc and the valve seat blocks the media delivery into the valve chamber. The valve stem is the force transmission component between the pneumatic actuator and the valve disc. By moving the valve disc, it adjusts the distance between the valve disc and the valve seat, thus quickly opening or closing the media delivery chamber. The pneumatic actuator includes piston-type and diaphragm-type actuators. Both use compressed air to push a telescopic rod along a straight line. When air is exhausted, a return spring pulls the telescopic rod back to its original position, controlling the telescopic rod's linear extension and retraction, thereby controlling the valve's opening and closing action.

[0004] The valve body's main chamber consists of an inlet chamber, an outlet chamber, and a shut-off chamber. The medium transported in the pipeline first flows through the inlet chamber into the shut-off chamber for flow regulation, and then through the shut-off chamber to the outlet chamber for discharge. The valve disc and valve seat are assembled within the shut-off chamber; by controlling the distance between the valve disc and valve seat, the opening or closing of the medium transport is controlled. To control the media transport using valve seats and valve discs, the connection points between the inlet and outlet chambers, and between the outlet and outlet chambers, are located on opposite sides of the valve seat. Furthermore, to install the valve on a straight pipeline, the inlet end of the inlet chamber and the outlet end of the outlet chamber must be on the same horizontal plane. This results in the inlet and outlet chambers being angled towards the outlet chamber on the valve body, creating an acute angle at the connection point between the outlet and outlet chambers. While this acute angle structure meets installation requirements, it causes significant fluid impact during actual operation. In environments with steam media temperatures reaching 630℃, the high-temperature flowing medium passing through this acute angle generates severe turbulence and impact forces. This not only accelerates the wear of the valve body material and shortens the valve's service life but also causes pressure fluctuations during media transport, affecting the operational stability of the entire pipeline system. Furthermore, current valve opening and closing actions rely on compressed air-driven valve stems. While this pneumatic control method offers rapid response, it demands extremely high air source stability. Fluctuations in compressed air pressure can cause changes in the positions of the valve stem and valve disc, affecting the valve's regulating function, leading to deviations in media delivery, and even causing pipeline system malfunctions. Therefore, pneumatic steam traps have shortcomings. Improvements to pneumatic steam traps can enhance the stability of media delivery and prevent air source fluctuations from impacting valve control. Summary of the Invention

[0005] In view of the shortcomings of the prior art, this utility model provides a pneumatic steam trap that improves the stability of medium transportation and avoids the impact of air source fluctuations on valve control, thereby overcoming the defects in the prior art.

[0006] The technical solution adopted by this utility model is as follows: a pneumatic steam trap, including a valve body, with an input chamber and an output chamber respectively provided on both sides of the valve body. A stop chamber is obliquely opened on the valve body, gradually approaching the output chamber from top to bottom. The bottom end of the output chamber is connected to the bottom end of the stop chamber. The output chamber is opened horizontally on the valve body. A valve seat is provided inside the stop chamber, and a sleeve is provided above the valve seat. Several through holes are opened on the side wall of the sleeve. The valve seat is pressed against the bottom end of the stop chamber by the sleeve. The input chamber is connected to the inner cavity of the sleeve through the through holes opened on the sleeve. The valve stem is fitted inside the sleeve, with a valve disc at the bottom end. The upper middle part of the valve stem extends out of the valve body. A guide seat is located above the valve body, with one side of the guide seat mounted on the valve stem and the other side having a sleeve hole. A guide rod is movably fitted inside this sleeve hole, parallel to the valve stem. The guide rod is mounted on the valve body, with a bolt on the side of the guide rod away from the valve stem. A threaded hole is located on the guide seat, and the bolt is threaded into this threaded hole, which is connected to the sleeve hole. A pneumatic actuator is mounted on the guide rod, and the valve stem is connected to the telescopic end of the pneumatic actuator.

[0007] Preferably, a sealing packing is provided on the side of the sleeve away from the valve seat. The sealing packing is slidably fitted onto the valve stem and is fitted into the shut-off cavity. A packing washer is provided between the sealing packing and the sleeve. The two sides of the packing washer are in contact with the sealing packing and the sleeve, respectively. A packing pressure ring is provided on the side of the sealing packing away from the sleeve. The bottom of the packing pressure ring, the sealing packing, and the packing washer are all located in the shut-off cavity. The packing pressure ring and the packing washer are movably fitted onto the valve stem. A packing pressure plate is provided on the side of the packing pressure ring away from the sealing packing. One side of the packing pressure plate is in contact with the packing pressure ring. A screw is provided on the other side of the packing pressure plate. The screw is installed on the valve body. Through holes are provided on both sides of the packing pressure plate. The through holes are movably fitted onto the screw or the valve stem. A nut is threaded onto the screw. The nut is in contact with the side of the packing pressure plate away from the packing pressure ring. The packing pressure plate, packing pressure ring, sealing packing, packing washer, sleeve, and valve seat are fixed to the valve body by the nut.

[0008] Preferably, a sealing ring is provided below the valve seat, and the sealing ring is movably sealed inside the stop cavity. The sealing ring is pressed against the stop cavity by the valve seat. A connecting cavity is provided on the valve body. The central axis of the connecting cavity coincides with the central axis of the stop cavity. The top end of the connecting cavity is connected to the bottom end of the stop cavity. The bottom end of the connecting cavity is connected to one end of the output cavity. The diameter of the connecting cavity is not greater than the diameter of the stop cavity.

[0009] Preferably, the valve body has an expansion cavity located above the valve seat and in the lower middle part of the sleeve. The diameter of the expansion cavity is not less than the outer diameter of the sleeve. The input cavity is connected to several through holes in the sleeve through the expansion cavity.

[0010] Preferably, the input cavity is inclinedly opened on the valve body on the side near the output cavity, the side of the input cavity near the output cavity gradually rises along the direction of the output cavity, the end of the input cavity near the output cavity is connected to the expansion cavity, and the central axis of the side of the input cavity away from the output cavity coincides with the central axis of the output cavity.

[0011] Preferably, the guide rod is provided with a scale layer that gradually extends along the direction from the valve body to the pneumatic actuator. A receiving plate is provided at the top of the guide rod, one side of which is mounted on the guide rod. The pneumatic actuator is mounted on the receiving plate, and a fixing hole is provided on the receiving plate. The valve stem is movably fitted into the fixing hole.

[0012] Preferably, a flange is fitted on the valve stem, the flange is installed on the top of the valve stem, a groove is opened on the telescopic rod of the pneumatic actuator, the top of the valve stem is fitted into the groove, the flange is in contact with the bottom end of the telescopic rod of the pneumatic actuator, and the flange is installed on the telescopic rod of the pneumatic actuator by screws.

[0013] The beneficial effects of this utility model are as follows: First, by having the stop chamber gradually approach the output chamber from top to bottom and the output chamber horizontally located on the valve body, this utility model not only reduces the processing difficulty of the output chamber but also makes the angle between the output chamber and the stop chamber obtuse, thereby improving the smoothness of the medium transmission from the stop chamber to the output chamber and reducing the impact at the connection between the output chamber and the stop chamber. The valve seat, valve stem, and valve disc are assembled inside the stop chamber to control its opening and closing. A sleeve with several through holes depressurizes the medium transported in the input chamber, ensuring uniform force on the valve stem and valve disc and preventing jamming during valve stem movement. Furthermore, this utility model constrains the movement of the valve stem through the guide seat on the valve stem and the guide rod on the valve body, reducing valve stem sway. Bolts on the guide seat can lock and fix the guide seat to the guide rod, thus fixing the valve stem to the valve body and preventing gas source fluctuations from affecting the valve stem.

[0014] Secondly, this invention uses a packing washer and a packing pressure ring to compress the sealing packing, thereby sealing the gap between the valve stem and the stop chamber and preventing media leakage. The packing pressure plate, screw, and nut secure the packing pressure ring, sealing packing, packing washer, sleeve, and valve seat to the valve body, allowing for quick disassembly and assembly, facilitating maintenance and repair. Furthermore, the sealing ring within the stop chamber prevents media leakage between the valve seat and the stop chamber. A connecting cavity in the valve body secures the sealing ring to the bottom of the stop chamber, ensuring smooth media flow from the stop chamber to the output chamber. An expansion cavity in the valve body allows media flowing through the input chamber to be fed into several through holes in the sleeve.

[0015] Furthermore, this utility model, through the set scale layer, facilitates understanding of the movement position of the valve stem and valve disc, thereby determining the size of the opening gap between the valve disc and the valve seat. Through the set connecting plate, the pneumatic actuator can be installed on the guide rod. Through the set flange, the valve stem can be detachably assembled onto the telescopic rod of the pneumatic actuator. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.

[0018] Figure 3 for Figure 1 Enlarged diagram of point B in the middle. Detailed Implementation

[0019] like Figures 1 to 3As shown, a pneumatic steam trap includes a valve body 1. An input chamber 2 and an output chamber 3 are respectively provided on both sides of the valve body 1. A stop chamber 4 is obliquely formed on the valve body 1, gradually approaching the output chamber 3 from top to bottom. The bottom ends of the output chamber 3 and the stop chamber 4 are connected. The output chamber 3 is horizontally formed on the valve body 1, such that the angle between the output chamber 3 and the stop chamber 4 is not less than 90°, i.e., the angle between the output chamber 3 and the stop chamber 4 is an obtuse angle. This improves the smoothness of the medium transmission from the stop chamber 4 to the output chamber 3 and reduces the impact at the connection between the output chamber 3 and the stop chamber 4. A valve seat is provided inside the stop chamber 4. 5. A sleeve 6 is provided above the valve seat 5. Several through holes are opened on the side wall of the sleeve 6. The valve seat 5 is pressed against the bottom end of the stop chamber 4 through the sleeve 6. The input chamber 2 is connected to the inner cavity of the sleeve 6 through the through holes. A valve stem 7 is fitted inside the sleeve 6. A valve disc 8 is provided at the bottom end of the valve stem 7. The pressure of the medium conveyed in the input chamber 2 is reduced by using the several through holes of the sleeve 6, and the force on the valve stem 7 and valve disc 8 is evenly distributed to avoid jamming during the movement of the valve stem 7. The valve seat 5 adopts a ring structure. A sealing ring is provided at the top of the valve seat 5. The inner diameter of the sealing ring is not greater than the maximum diameter of the valve disc 8. The valve stem 7 drives the valve disc 8 to move towards the valve seat 5, thereby sealing the inner cavity of the valve seat 5 with the valve disc 8, and quickly cutting off the flow in the shut-off chamber 4 to rapidly close the medium delivery. The upper middle part of the valve stem 7 extends out from the valve body 1. A guide seat 9 is provided above the valve body 1. One side of the guide seat 9 is mounted on the valve stem 7, and the other side of the guide seat 9 has a sleeve hole in which a guide rod 10 is movably fitted. The diameter of the sleeve hole matches the diameter of the guide rod 10. The guide rod 10 is parallel to the valve stem 7 and is mounted on the valve body 1, thereby constraining the movement of the valve stem 7 and raising the valve stem 7. To ensure the stability of the movement, a bolt 11 is provided on the side of the guide rod 10 away from the valve stem 7. A threaded hole is provided on the guide seat 9, and the bolt 11 is threaded into the threaded hole. The threaded hole is connected to the sleeve hole. The guide seat 9 is clamped and fixed to the guide rod 10 by the bolt 11 so as to lock and fix the guide rod 10 to the valve body 1. A pneumatic actuator 12 is provided on the guide rod 10. The valve stem 7 is connected to the telescopic end of the pneumatic actuator 12, so that the pneumatic actuator 12 is assembled on the valve body 1. By driving the pneumatic actuator 12 to perform telescopic movements, the valve stem 7 is driven to perform telescopic movements, thereby controlling the opening or closing of the shut-off chamber 4.It should be noted that valve body 1 is made of martensitic heat-resistant steel of G115 material. The standard grade of G115 material is 08Cr9W3Co3VNbCuBN, ​​which can be industrially applied to martensitic heat-resistant steel with metal wall temperatures of 630-650℃. Compared with heat-resistant P92 steel, its strength is increased by 23% and its oxidation resistance is enhanced by 40%. The high performance of G115 steel makes the valves made from it widely applicable under high temperature, high pressure and strong corrosion conditions, and suitable for various fields such as thermal power, chemical industry, nuclear power and new energy.

[0020] In this embodiment, a sealing packing 13 is provided on the side of the sleeve 6 away from the valve seat 5. The sealing packing 13 is slidably fitted onto the valve stem 7 and sealed within the shut-off cavity 4, thereby sealing the gap between the valve stem 7 and the shut-off cavity 4 and preventing the medium from leaking out. A packing washer 14 is provided between the sealing packing 13 and the sleeve 6, with both sides of the packing washer 14 contacting the sealing packing 13 and the sleeve 6 respectively. A packing pressure ring 15 is provided on the side of the sealing packing 13 away from the sleeve 6. The packing washer 14 and the packing pressure ring 15 compress the sealing packing 13 to seal the gap between the valve stem 7 and the shut-off cavity 4. The bottom of the packing pressure ring 15, the sealing packing 13, and the packing washer 14 are all located within the shut-off cavity 4, and the packing pressure ring 15 and the packing washer 14 are movably fitted onto the valve stem 7. On the valve body 1, a packing pressure plate 16 is provided on the side of the packing ring 15 away from the sealing packing 13. One side of the packing pressure plate 16 is in contact with the packing ring 15, and a screw 17 is provided on the other side of the packing pressure plate 16. The screw 17 is installed on the valve body 1. Through holes are opened on both sides of the packing pressure plate 16. The through holes are movably fitted onto the screw 17 or the valve stem 7. A nut 18 is threaded on the screw 17. The nut 18 is in contact with the side of the packing pressure plate 16 away from the packing ring 15. The packing pressure plate 16, packing ring 15, sealing packing 13, packing washer 14, sleeve 6 and valve seat 5 are pressed and fixed on the valve body 1 by the nut 18, so as to quickly disassemble and assemble the packing pressure plate 16, packing ring 15, sealing packing 13, packing washer 14, sleeve 6 and valve seat 5, thereby facilitating the maintenance and repair of this utility model. The guide seat 9 is located between the packing pressure plate 16 and the pneumatic actuator 12.

[0021] Please refer to it again. Figure 2A sealing ring 19 is provided below the valve seat 5. The sealing ring 19 is movably sealed inside the stop cavity 4. The sealing ring 19 is pressed against the stop cavity 4 by the valve seat 5 to prevent the medium from leaking out from the gap between the valve seat 5 and the stop cavity 4. A connecting cavity 20 is provided on the valve body 1. The central axis of the connecting cavity 20 coincides with the central axis of the stop cavity 4. The top end of the connecting cavity 20 is connected to the bottom end of the stop cavity 4. The bottom end of the connecting cavity 20 is connected to one end of the output cavity 3. The diameter of the connecting cavity 20 is not greater than the diameter of the stop cavity 4 so that the sealing ring 19 can be pressed and fixed on the bottom end of the stop cavity 4. The diameter of the connecting cavity 20 is not less than the inner diameter of the valve seat 5 so that the medium conveyed by the valve seat 5 can enter the output cavity 3 through the connecting cavity 20. Furthermore, the central axis of the connecting cavity 20 intersects the central axis of the output cavity 3 at one point to ensure the smooth flow of the medium from the stop cavity 4 into the output cavity 3.

[0022] In this embodiment, the valve body 1 has an expansion cavity 21 located above the valve seat 5 so that the medium flows through the inner cavity of the valve seat 5. The expansion cavity 21 is located in the lower middle part of the sleeve 6, and the diameter of the expansion cavity 21 is not less than the outer diameter of the sleeve 6. The central axis of the expansion cavity 21 coincides with the central axis of the shut-off cavity 4. The input cavity 2 is connected to several through holes opened in the sleeve 6 through the expansion cavity 21 so that the medium flowing through the input cavity 2 is sent into the several through holes opened in the sleeve 6 through the expansion cavity 21.

[0023] Specifically, the input cavity 2 is inclinedly opened on the valve body 1 on the side near the output cavity 3. The end of the input cavity 2 near the output cavity 3 is connected to the expansion cavity 21. The side of the input cavity 2 near the output cavity 3 gradually rises along the direction of the output cavity 3 so as to transport the medium into the expansion cavity 21 through the input cavity 2. The central axis of the side of the input cavity 2 away from the output cavity 3 coincides with the central axis of the output cavity 3 so as to install the product on a straight pipe.

[0024] Please refer to it again. Figure 1 The guide rod 10 is provided with a scale layer 22, which gradually extends along the direction from the valve body 1 to the pneumatic actuator 12. By observing the positional change of the guide seat 9 relative to the scale layer 22, the position of the valve stem 7 and the valve disc 8 can be understood, thereby determining the size of the gap between the valve disc 8 and the valve seat 5. The top of the guide rod 10 is provided with a receiving plate 23, one side of which is mounted on the guide rod 10. The pneumatic actuator 12 is mounted on the receiving plate 23. The receiving plate 23 has a fixing hole, and the valve stem 7 is movably fitted into the fixing hole, thereby mounting the pneumatic actuator 12 on the guide rod 10.

[0025] Please refer to it again. Figure 3A flange 24 is fitted onto the valve stem 7, and the flange 24 is installed on the top of the valve stem 7. A groove is opened on the telescopic rod of the pneumatic actuator 12, and the top of the valve stem 7 is fitted into the groove. The flange 24 is in contact with the bottom end of the telescopic rod of the pneumatic actuator 12. The flange 24 is installed on the telescopic rod of the pneumatic actuator 12 by screws, thereby facilitating the quick and easy assembly and disassembly of the connection between the valve stem 7 and the telescopic rod of the pneumatic actuator 12.

[0026] The instructions for using this product are as follows: Figures 1 to 3 As shown, the valve body 1 is installed in a preset position in the pipeline transportation system to ensure precise alignment and reliable sealing with the pipeline system. Then, the air source is connected to the pneumatic actuator 12 to control its extension and retraction. When the pipeline transportation system is running, the medium supplied from the upstream pipeline first flows into the expansion chamber 21 through the input chamber 2. Then, through several through holes in the sleeve 6, the medium flowing into the expansion chamber 21 is depressurized and transported into the sleeve 6. Next, through the inner cavity of the valve seat 5 and the connecting chamber 20, the medium flowing into the sleeve 6 is transported to the output chamber 3. Finally, through the output chamber 3, the medium is transported to the downstream pipeline via the connection port between the output chamber 3 and the downstream pipeline to meet the needs of the pipeline transportation system. It should be noted that, to ensure that the valve opening and closing action is not affected by fluctuations in the air source pressure, when the product performs the opening or closing action, the bolts 11 are tightened to clamp and fix the guide seat 9 onto the guide rod 7, that is, the valve rod 7 is fixedly assembled onto the valve body 1.

[0027] In this embodiment, the stop chamber 4 gradually approaches the output chamber from top to bottom, and the output chamber 3 is opened horizontally on the valve body 1. This not only reduces the processing difficulty of the output chamber 3, but also makes the corner between the output chamber 3 and the stop chamber 4 obtuse, thereby improving the smoothness of the medium being transmitted from the stop chamber 4 to the output chamber 3 and reducing the impact at the connection between the output chamber 3 and the stop chamber 4. The valve seat 5, valve stem 7 and valve disc 8 are assembled in the stop chamber 4 to control the closing or opening of the stop chamber 4. The sleeve 6 with several through holes reduces the pressure of the medium transported in the input chamber 2, so that the valve stem 7 and valve disc 8 are subjected to uniform force and avoid jamming during the movement of the valve stem 7. Furthermore, in this embodiment, the movement of the valve stem 7 is constrained by the guide seat 9 provided on the valve stem 7 and the guide rod 10 provided on the valve body 1, thereby reducing the shaking phenomenon of the valve stem 7. The guide seat 9 can be locked and fixed on the guide rod 10 by the bolt 11 provided on the guide seat 9, that is, the valve stem 7 is fixed on the valve body 1 to avoid the gas source fluctuation affecting the valve stem 7.

[0028] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A pneumatic steam trap, comprising a valve body (1), wherein an input chamber (2) and an output chamber (3) are respectively provided on both sides of the valve body (1), characterized in that: The valve body (1) is inclinedly provided with a stop chamber (4), which gradually approaches the output chamber (3) from top to bottom. The output chamber (3) is connected to the bottom end of the stop chamber (4). The output chamber (3) is opened horizontally on the valve body (1). A valve seat (5) is provided in the stop chamber (4). A sleeve (6) is provided above the valve seat (5). Several through holes are opened on the side wall of the sleeve (6). The valve seat (5) is pressed against the bottom end of the stop chamber (4) through the sleeve (6). The input chamber (2) is connected to the inner cavity of the sleeve (6) through the through holes opened on the sleeve (6). A valve stem (7) is fitted inside the sleeve (6). A valve disc (8) is provided at the bottom end of the valve stem (7). (7) extends from the upper middle part of the valve body (1). A guide seat (9) is provided above the valve body (1). One side of the guide seat (9) is installed on the valve stem (7). A sleeve hole is opened on the other side of the guide seat (9). A guide rod (10) is movably fitted in the sleeve hole. The guide rod (10) is parallel to the valve stem (7). The guide rod (10) is installed on the valve body (1). A bolt (11) is provided on the side of the guide rod (10) away from the valve stem (7). A threaded hole is opened on the guide seat (9). The bolt (11) is threaded into the threaded hole. The threaded hole is connected to the sleeve hole. A pneumatic actuator (12) is provided on the guide rod (10). The valve stem (7) is connected to the telescopic end of the pneumatic actuator (12).

2. The pneumatic steam trap according to claim 1, characterized in that: A sealing packing (13) is provided on the side of the sleeve (6) away from the valve seat (5). The sealing packing (13) is slidably fitted onto the valve stem (7) and is fitted into the stop cavity (4). A packing washer (14) is provided between the sealing packing (13) and the sleeve (6). The two sides of the packing washer (14) are in contact with the sealing packing (13) and the sleeve (6) respectively. A packing pressure ring (15) is provided on the side of the sealing packing (13) away from the sleeve (6). The bottom of the packing pressure ring (15), the sealing packing (13), and the packing washer (14) are all located in the stop cavity (4). The packing pressure ring (15) and the packing washer (14) are movably fitted onto the valve stem (7). The packing pressure ring (15) is located away from the valve seat (5). A packing pressure plate (16) is provided on one side of the sealing packing (13). One side of the packing pressure plate (16) is in contact with the packing pressure ring (15). A screw (17) is provided on the other side of the packing pressure plate (16). The screw (17) is installed on the valve body (1). Through holes are opened on both sides of the packing pressure plate (16). The sleeve is movably fitted on the screw (17) or the valve stem (7). A nut (18) is threaded on the screw (17). The nut (18) is in contact with the side of the packing pressure plate (16) away from the packing pressure ring (15). The packing pressure plate (16), the packing pressure ring (15), the sealing packing (13), the packing washer (14), the sleeve (6), and the valve seat (5) are pressed and fixed on the valve body (1) by the nut (18).

3. The pneumatic steam trap according to claim 1, characterized in that: A sealing ring (19) is provided below the valve seat (5). The sealing ring (19) is movably sealed inside the stop cavity (4). The sealing ring (19) is pressed onto the stop cavity (4) by the valve seat (5). A connecting cavity (20) is provided on the valve body (1). The central axis of the connecting cavity (20) coincides with the central axis of the stop cavity (4). The top end of the connecting cavity (20) is connected to the bottom end of the stop cavity (4). The bottom end of the connecting cavity (20) is connected to one end of the output cavity (3). The diameter of the connecting cavity (20) is not greater than the diameter of the stop cavity (4).

4. The pneumatic steam trap according to claim 1, characterized in that: The valve body (1) has an expansion cavity (21) located above the valve seat (5) and in the lower middle part of the sleeve (6). The diameter of the expansion cavity (21) is not less than the outer diameter of the sleeve (6). The input cavity (2) is connected to several through holes in the sleeve (6) through the expansion cavity (21).

5. The pneumatic steam trap according to claim 4, characterized in that: The input cavity (2) is inclinedly opened on the valve body (1) on the side near the output cavity (3). The side of the input cavity (2) near the output cavity (3) gradually rises along the direction near the output cavity (3). The end of the input cavity (2) near the output cavity (3) is connected to the expansion cavity (21). The central axis of the side of the input cavity (2) away from the output cavity (3) coincides with the central axis of the output cavity (3).

6. The pneumatic steam trap according to claim 1, characterized in that: The guide rod (10) is provided with a scale layer (22), which extends gradually along the direction from the valve body (1) to the pneumatic actuator (12). The top of the guide rod (10) is provided with a receiving plate (23), one side of the receiving plate (23) is installed on the guide rod (10), the pneumatic actuator (12) is installed on the receiving plate (23), and a fixing hole is provided on the receiving plate (23). The valve stem (7) is movably fitted on the fixing hole.

7. The pneumatic steam trap according to claim 1, characterized in that: A flange (24) is fitted on the valve stem (7). The flange (24) is installed on the top of the valve stem (7). A groove is opened on the telescopic rod of the pneumatic actuator (12). The top of the valve stem (7) is fitted into the groove. The flange (24) is in contact with the bottom end of the telescopic rod of the pneumatic actuator (12). The flange (24) is installed on the telescopic rod of the pneumatic actuator (12) by screws.

Images