Dual seal stopcock valve

Abstract

The utility model discloses a valve field's a kind of two-way sealing stopcock valve, including valve body, the stopcock is arranged in above-mentioned valve body, two elastic valve seat structures are arranged in above-mentioned valve body, two above-mentioned elastic valve seat structures are respectively arranged in the position of corresponding two sides flow channel in above-mentioned valve body, and the end of above-mentioned elastic valve seat structure close to above-mentioned stopcock abuts on the outer wall of above-mentioned stopcock;By setting elastic valve seat structure, so that valve seat will continue to be pre-tightening force and push to stopcock, valve seat has automatic compensation function, ensure that under the wear condition of valve seat, after elastic valve seat structure self-compensation, still can guarantee preferable sealing performance;Metal hard sealing valve seat sealing structure guarantees the sealing performance of stopcock valve under high temperature complex working condition;The setting of jacket guarantees the circulating flow between jacket cavity and pipeline of heat preservation medium, sufficiently guarantee the effective control to medium temperature in valve body;And through flushing interface and blowdown interface, it is convenient to flush in sealing cavity, improve heat preservation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of valves, and in particular to a bidirectional sealing plug valve. Background Technology

[0002] Plug valves are widely used in oil and gas extraction, transportation and refining equipment, as well as in the petrochemical, chemical, coal gas, natural gas, liquefied petroleum gas, HVAC and general industries.

[0003] Chinese invention patent document CN104728461A discloses a thermally insulated sealing jacketed plug valve, comprising a valve body, a valve disc, and a valve stem. The valve disc is located within the valve body, and the valve stem is connected to the valve disc. The valve body includes a valve seat, which is embedded within the valve body. The valve disc is fixedly connected to the valve body via the valve seat. The valve and valve stem are an integral structure. The valve stem extends outside the valve body. A valve cover is provided on the top of the valve body, separating the valve body from the portion of the valve stem extending outside the valve body. The valve cover and valve body are connected by a sealing ring. A jacket is provided on the outer wall of the valve body, and the inner wall of the jacket and the outer wall of the valve body form an elliptical sealing cavity.

[0004] In the technical solution disclosed in the above patent, the valve seat sealing material of the plug valve is embedded in the valve body. After the medium erodes and wears, it does not have a compensation function, which can easily lead to valve seat seal failure. Utility Model Content

[0005] To overcome its shortcomings, the technical problem to be solved by this utility model is: how to improve the problem of valve seat wear leading to sealing failure.

[0006] The technical solution adopted by this utility model to solve its technical problem is: A bidirectional sealing plug valve includes a valve body, a plug is provided in the valve body, and two resilient valve seat structures are provided in the valve body. The two resilient valve seat structures are respectively provided at the positions of the corresponding two flow channels in the valve body, and the end of the resilient valve seat structure near the plug abuts against the outer wall of the plug.

[0007] Furthermore, the aforementioned resilient valve seat structure includes a valve seat, valve seat packing, valve seat pressure ring, and resilient element connected in sequence. One end of the valve seat contacts the outer wall of the aforementioned plug, and the other end is connected to the valve seat packing. The two ends of the aforementioned resilient element are respectively connected to the aforementioned valve seat pressure ring and the inner wall of the valve body.

[0008] Furthermore, the valve seat is made of an alloy material.

[0009] Furthermore, the aforementioned elastic element includes an elastic ring.

[0010] Furthermore, a jacket is provided on the outer side of the valve body, and a sealing cavity is formed between the outer wall of the valve body and the inner wall of the jacket; the sealing cavity is filled with a heat-insulating medium, and the jacket is connected to an inlet pipe and an outlet pipe for circulating the heat-insulating medium; the inlet pipe and the outlet pipe are connected to a medium circulation device.

[0011] Furthermore, the aforementioned jacket is equipped with a flushing port and a sewage discharge port.

[0012] Furthermore, the jacket is equipped with a temperature transmitter and an alarm device. When the temperature transmitter detects that the temperature of the insulation medium exceeds the preset range, the alarm device issues an alarm message.

[0013] Furthermore, the above-mentioned plug is provided with a mounting cam and a mounting groove at its upper and lower ends, respectively. The valve body is connected to a valve cover, and the valve cover is provided with a mounting hole that rotatably engages with the mounting cam. The valve body is provided with a protrusion that rotatably engages with the mounting groove. The plug is axially provided with a valve stem, which extends outward through the valve cover.

[0014] Furthermore, a hardened layer is provided at the corresponding contact positions of the aforementioned elastic valve seat structure and the outer wall of the aforementioned plug.

[0015] The beneficial effects of this utility model are: By incorporating a resilient valve seat structure, the valve seat is continuously pushed towards the plug by a preload. The valve seat has an automatic compensation function, ensuring that even when wear occurs, the resilient valve seat structure can still maintain excellent sealing performance after self-compensation. Furthermore, the metal hard-seal valve seat structure ensures the sealing performance of the plug valve under complex medium- and high-temperature operating conditions.

[0016] The jacket design ensures the circulation of the insulation medium between the jacket cavity and the pipeline, effectively controlling the temperature of the medium inside the valve body; and the flushing and drain ports facilitate flushing of the sealed cavity, improving insulation efficiency. Attached Figure Description

[0017] Figure 1 This is a front sectional view of the present invention; Figure 2 This is a utility model Figure 1 Enlarged view of point A in the middle; Figure 3 This is a top sectional view of the present invention; Figure 4 This is a left sectional view of the present invention; Figure 5 This is an exploded schematic diagram of the elastic valve seat structure of this utility model; The components in the diagram are labeled as follows: 1-valve body, 2-plug, 3-valve stem, 4-jacket, 5-sealing cavity, 6-valve seat, 7-valve seat packing, 8-valve seat pressure ring, 9-elastic element, 10-mounting cam, 11-mounting groove, 12-hardened layer, 13-inlet pipe, 14-outlet pipe, 15-temperature transmitter, 16-drain port, 17-flushing port, 18-valve cover. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] like Figures 1-5 As shown in the figure, this application proposes a bidirectional sealing plug valve, including a valve body 1, a plug 2 disposed within the valve body 1, and two resilient valve seat structures disposed within the valve body 1. The two resilient valve seat structures are respectively disposed at positions corresponding to the two sides of the flow channel within the valve body 1, with one end of the resilient valve seat structure near the plug 2 abutting against the outer wall of the plug 2. By providing the resilient valve seat structures, the valve seat 6 is continuously pushed against the plug 2 by a preload. The valve seat 6 has an automatic compensation function, ensuring that even when the valve seat 6 experiences wear, the resilient valve seat structure can still maintain good sealing performance after self-compensation. The resilient valve seat 6 can achieve the elastic compensation effect by providing an elastic pad between the resilient valve seat structure and the inner wall of the valve body 1.

[0020] Specifically, the aforementioned resilient valve seat structure includes a valve seat 6, valve seat packing, valve seat pressure ring, and elastic element 9 connected in sequence. One end of the valve seat 6 contacts the outer wall of the plug 2, and the other end is connected to the valve seat packing. The two ends of the elastic element 9 are respectively connected to the valve seat pressure ring and the inner wall of the valve body 1. The valve seat packing is an existing sealing packing. The valve seat pressure ring achieves a sealing connection between the valve seat packing and the valve seat 6, providing a better sealing effect. The valve seat 6, valve seat packing, and valve seat pressure ring form an integrated compression structure, which is pressed against the outer wall of the plug 2 by the elastic force of the elastic element 9, forming a stable sealing structure. When wear occurs at the plug 2 or valve seat 6, the elastic element 9 compensates under the elastic force, preventing the sealing structure from failing.

[0021] The valve seat 6 is made of alloy material, meaning that the hard metal valve seat 6 sealing structure ensures the sealing performance of the plug valve under complex medium- and high-temperature conditions, and is resistant to erosion, wear, and has an automatic compensation function. The elastic element 9 includes an elastic ring or a spring structure. Through the presence of the elastic ring or spring, the valve seat 6 is continuously pushed towards the plug 2 by a preload. The valve seat 6 has an automatic compensation function, and a hardened layer 12 is provided at the corresponding contact positions of the elastic valve seat structure and the outer wall of the plug 2. That is, the surfaces of the valve seat 6 and the plug 2 are hardened and fully ground to reduce the wear rate. The valve seat packing and valve stem 3 packing are high-temperature resistant graphite packing, and the sealing gasket of the valve body 1 and valve cover 18 is also a high-temperature resistant metal graphite spiral wound gasket, which fully ensures the sealing performance and fire resistance of the valve under medium- and high-temperature conditions.

[0022] The entire plug valve adopts a top-mounted design, which is simple and practical in structure. It can be maintained and repaired online and the seals can be replaced. The valve stem 3 packing is easy and quick to disassemble and install. The valve body 1 and valve cover 18 are designed with positioning and installation grooves at the gasket positions. The valve seat 6 and valve seat pressure ring are reserved with valve seat packing installation slots. The gasket and valve seat packing are also easy and quick to disassemble and install.

[0023] A stopcock 2 is disposed within the valve body 1. The stopcock 2 has a mounting convex shaft 10 and a mounting groove 11 at its upper and lower ends, respectively. The valve body 1 is connected to a valve cover 18, which has a mounting hole that rotatably engages with the mounting convex shaft 10. The valve body 1 also has a protrusion that rotatably engages with the mounting groove 11. A valve stem 3 is axially mounted on the stopcock 2, extending outwards through the valve cover 18. In other words, the stopcock 2 can only rotate and will not move in the direction of media flow, ensuring stable operation of the stopcock valve. The stopcock 2 is cylindrical. The part of the stopcock 2 that is subjected to erosion is not its sealing surface. Even if this part is severely eroded, it will not affect the valve's sealing function. Therefore, the valve seat 6 has good sealing performance, erosion resistance, and wear resistance.

[0024] The valve stem 3 has a raised ring on its outer wall, and the valve body 1 has an annular groove that rotates axially with the raised ring. In other words, the valve stem 3 extends outward from the valve cover 18 in an inverted manner to prevent the valve stem 3 from floating. To prevent pressure bursting, the exposed valve stem 3 is connected to a handle, gearbox, pneumatic or electric actuator, etc., to achieve operation.

[0025] In this embodiment, a jacket 4 is provided on the outer side of the valve body 1, and a sealing cavity 5 is formed between the outer wall of the valve body 1 and the inner wall of the jacket 4. The sealing cavity 5 is filled with a heat-insulating medium, and the jacket 4 is connected to an inlet pipe 13 and an outlet pipe 14 for circulating the heat-insulating medium. The inlet pipe 13 and the outlet pipe 14 are connected to a medium circulation device. The inlet pipe 13 and the outlet pipe 14 are respectively located on the left and right sides of the jacket 4. The heat-insulating medium at a preset temperature is circulated in the sealing cavity 5 through the medium circulation device, which fully ensures the effective control of the medium temperature in the valve body 1. The jacket 4 is a full-jacket design, and the entire cavity of the valve body 1 is surrounded by the jacket 4. The inner wall of the jacket 4 and the outer wall of the valve body 1 form a semi-cylindrical sealing cavity 5.

[0026] The aforementioned jacket 4 is equipped with a flushing port 17 at the top and a drain port 16 at the bottom. By adding the flushing port 17 and the drain port 16, the insulation medium within the semi-cylindrical sealing cavity 5 formed by the inner wall of the jacket 4 and the outer wall of the valve body 1 can be flushed and discharged when needed, ensuring the cleanliness of the sealing cavity 5 and the insulation medium, while also guaranteeing the insulation effect of the medium-high temperature bidirectional metal-sealed insulation jacket 4 plug valve. To facilitate the installation and disassembly of the insulation medium circulation connection inlet pipe 13, outlet pipe 14, flushing port 17, and drain port 16, and to meet the adaptability of different users' on-site needs, all connection ports can be threaded, flanged, or customized according to customer requirements.

[0027] To achieve information technology and automatic control of the medium- and high-temperature bidirectional metal-sealed insulation jacket 4 plug valve, and to better ensure the insulation effect and real-time temperature monitoring, the jacket 4 is equipped with a temperature transmitter 15 and an alarm device. The temperature can be set to the medium temperature range required by the valve. When the temperature is too low or too high, it can promptly provide real-time temperature information and alarm, reminding operators to detect and handle the temperature situation in a timely manner.

[0028] To ensure the strength of the jacket 4, guarantee the safety of the customer's on-site use, and extend the service life of the valve, the jacket 4 and the valve body 1 are fully welded. The thickness of the jacket 4 is strictly in accordance with the standard requirements based on the customer's insulation medium pressure, and a safety margin is fully considered.

[0029] In summary, this utility model proposes a bidirectional sealing plug valve. The medium-high temperature bidirectional metal sealing plug valve exhibits reliable sealing performance under medium-high temperature conditions. Its all-metal hard-seal valve seat 6 sealing structure is erosion-resistant, wear-resistant, and its automatic compensation valve seat 6 function is reliable. The jacket 4 structure is equipped with an inlet pipe 13, an outlet pipe 14, a flushing interface 17, and a drain interface 16, ensuring the circulation of the insulation medium between the jacket 4 cavity and the pipeline. This effectively controls the temperature of the medium inside the valve body 1 and allows for the sealing of the inner wall of the jacket 4 with the outer wall of the valve body 1 when necessary. The insulation medium inside the semi-cylindrical sealing cavity 5 is flushed and discharged to ensure the cleanliness of the sealing cavity 5 and the insulation medium in the jacket 4, while also ensuring the insulation effect of the medium- and high-temperature bidirectional metal-sealed insulation jacket 4 plug valve. Through the temperature transmitter 15 and alarm device, the temperature can be set to the medium temperature range required by the valve. When the temperature is too low or too high, real-time temperature information and alarms can be fed back in time to remind the operator to detect and deal with the temperature situation in time. The whole structure is simple and practical, with outstanding advantages and clear gain effect, and is suitable for special demand applications.

Claims

1. A bidirectional sealing plug valve, comprising a valve body (1), wherein a plug (2) is disposed within the valve body (1), characterized in that, The valve body (1) is provided with two elastic valve seat structures. The two elastic valve seat structures are respectively located in the valve body (1) at the positions of the flow channels on both sides. The end of the elastic valve seat structure near the plug (2) abuts against the outer wall of the plug (2).

2. The bidirectional sealing plug valve according to claim 1, characterized in that, The resilient valve seat structure includes a valve seat (6), a valve seat packing, a valve seat pressure ring, and an elastic element (9) connected in sequence. One end of the valve seat (6) contacts the outer wall of the plug (2), and the other end is connected to the valve seat packing. The two ends of the elastic element (9) are respectively connected to the valve seat pressure ring and the inner wall of the valve body (1).

3. The bidirectional sealing plug valve according to claim 2, characterized in that, The valve seat (6) is made of alloy material.

4. The bidirectional sealing plug valve according to claim 2, characterized in that, The elastic element (9) includes an elastic ring.

5. The bidirectional sealing plug valve according to claim 1, characterized in that, A jacket (4) is provided on the outside of the valve body (1), and a sealing cavity (5) is formed between the outer wall of the valve body (1) and the inner wall of the jacket (4); the sealing cavity (5) is filled with a heat-insulating medium, and the jacket (4) is connected to an inlet pipe (13) and an outlet pipe (14) for circulating the heat-insulating medium; the inlet pipe (13) and the outlet pipe (14) are connected to a medium circulation device.

6. The bidirectional sealing plug valve according to claim 5, characterized in that, The jacket (4) is provided with a flushing port (17) and a sewage discharge port (16).

7. The bidirectional sealing plug valve according to claim 5, characterized in that, The jacket (4) is equipped with a temperature transmitter (15) and an alarm device. When the temperature transmitter (15) detects that the temperature of the insulation medium exceeds the preset range, the alarm device issues an alarm message.

8. The bidirectional sealing plug valve according to claim 1, characterized in that, The plug (2) has a mounting cam (10) and a mounting groove (11) at its upper and lower ends, respectively. The valve body (1) is connected to a valve cover (18). The valve cover (18) has a mounting hole that rotates with the mounting cam (10). The valve body (1) has a protrusion that rotates with the mounting groove (11). The plug (2) has a valve stem (3) axially arranged. The valve stem (3) extends outward through the valve cover (18).

9. The bidirectional sealing plug valve according to claim 8, characterized in that, Hardened layers (12) are provided at the corresponding contact positions of the elastic valve seat structure and the outer wall of the plug (2).

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