Fluorine-lined plug valve

Abstract

The utility model discloses a fluorine lining plug valve which comprises a plug valve body, a valve element is movably installed in the plug valve body, the top of the valve element is fixed to a valve rod, meanwhile, the surface of the plug valve body is in threaded connection with a fixed valve deck, and the valve deck and the valve rod are sealed through an efficient sealing assembly. The efficient sealing assembly comprises a sealing plug, the sealing plug covers the bottom of the valve rod, meanwhile, the top of the sealing plug is fixed to a pressing piece, the upper side of the pressing piece covers a lining cylinder, the top of the lining cylinder is fixed to a sealing pressed seat, and the surface of the sealing pressed seat covers a lower pressing seat. According to the fluorine-lined plug valve, the downward pressing seat moves downwards to compress the sealing pressed seat, the inner wall of the sealing pressed seat is pressed to be tightly attached to the outer side of the valve rod, the outer side wall of the sealing pressed seat and the inner wall of the sealing groove are sealed, efficient sealing work between the valve cover and the valve rod is completed, the sealing performance of the plug valve body is improved, and liquid leakage cannot occur between the valve cover and the valve rod.

Description

Technical Field

[0001] The utility model relates to the field of plug valves, in particular to a fluorine-lined plug valve. Background Art

[0002] In the development of modern industry, fluorine-lined valves and various pipeline accessories are widely used in various fields such as petroleum, printing and dyeing, and chemical industry. Fluorine-lined valves are specially used to control corrosive or highly corrosive media. The inner surface of the valve body is covered with various fluoroplastics that can be selected. It is suitable for different working temperatures and fluid pipelines. It has the characteristics of high strength and good corrosion resistance. As the preferred project in the project, it has attracted great attention and favor from various engineering design units and construction units. It is a sunrise product with great market potential.

[0003] High-performance fluorine-lined plug valves often require precision control and program control during production due to their small output and high quality requirements, and play a decisive role in the production and safety of fine chemical plants.

[0004] At present, the domestic production of fluorine-lined valves has a short time, and the domestic valve industry is mainly distributed in Shanghai, Zhejiang, Tianjin and Hebei, while there is a market gap for high-pressure fluorine-lined plug valves. Some high-end chemical plants mostly use alloy steel valves and imported fluorine-lined valves for corrosive media conditions, which have high manufacturing costs and long procurement cycles.

[0005] Including valve body, steel ball, sealing ring, plug body, cone sleeve, pressure pad, packing, upper cover, packing gland and handle, plug valve is most suitable for cutting off and connecting medium and diverting. The external seal of existing plug valve has two parts, namely the seal between valve body and valve cover and the seal between valve stem and valve cover. These two seals are completed by pressing valve cover and gland to squeeze packing and then pressing valve stem. The plug valve with such structure has imperfect sealing and is easy to leak, resulting in loss of valve function. Utility Model Content

[0006] The utility model aims to provide a fluorine-lined plug valve to solve the defects mentioned in the above background technology.

[0007] To achieve the above object, a fluorine-lined plug valve is provided, comprising a plug valve body, a valve core is movably installed inside the plug valve body, and the top of the valve core is fixed to the valve stem, while a valve cover is screwed and fixed on the surface of the plug valve body, and the valve cover and the valve stem are sealed by a high-efficiency sealing component;

[0008] The high-efficiency sealing assembly includes a sealing plug, and the sealing plug covers the bottom of the valve stem, and the top of the sealing plug is fixed to the pressure plate, and the upper side of the pressure plate covers the inner liner, the top of the inner liner is fixed to the sealing pressure seat, and the surface of the sealing pressure seat covers the lower pressure seat, the top of the lower pressure seat is fixed to the fixing plate, and four groups of through holes are evenly opened on the outside of the fixing plate, and four groups of screw holes are opened in the middle of the surface of the valve cover, and four groups of fixing bolts pass through the four groups of through holes and are screwed and fixed to the inside of the four groups of screw holes.

[0009] Preferably, the sealing plug and the pressing plate are combined together to form a "T"-shaped arrangement, and the plug valve body and the valve cover are sealed by the sealing plug and the pressing plate.

[0010] Preferably, a sealing groove is provided in the middle of the valve cover, and the sealing groove is adapted to the size of the inner liner, and the inner liner is clamped in the sealing groove.

[0011] Preferably, the transverse section of the sealing pressure seat is dovetail-shaped, and the transverse section of the lower pressure seat is dovetail-shaped, and the lower pressure seat moves downward to be clamped on the outer side of the sealing pressure seat and fixed by four sets of fixing bolts.

[0012] Preferably, a force-bearing surface is provided on the outer side of the sealing pressure-bearing seat, and an inner pressure surface is provided on the inner wall of the lower pressure seat, and the inner pressure surface is arranged parallel to the force-bearing surface.

[0013] Preferably, the inner liner and the sealing pressure seat are both made of rubber material and have a circular axial cross-section, and the lower pressure seat moves downward to squeeze the sealing pressure seat.

[0014] Compared with the prior art, the utility model has the following beneficial effects: the lower pressure seat moves downward to compress the sealing pressure seat, the sealing pressure seat is compressed and its inner wall is tightly attached to the outside of the valve stem, and the outer wall of the sealing pressure seat is sealed with the inner wall of the sealing groove, thereby completing efficient sealing between the valve cover and the valve stem, improving the sealing of the plug valve body, and preventing leakage between the valve cover and the valve stem. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view schematic diagram of the structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the high-efficiency sealing component of the utility model;

[0017] Figure 3 The utility model structure Figure 2 Schematic diagram of the pressure-bearing seat of the seal;

[0018] Figure 4 This is a schematic diagram of the installation structure of the lower pressure seat of the utility model.

[0019] Numbers in the figure: 1. Plug valve body; 2. Valve core; 3. Valve cover; 4. Valve stem; 5. High-efficiency sealing assembly; 51. Sealing plug; 52. Pressing plate; 53. Sealing groove; 54. Inner liner; 55. Sealing pressure seat; 56. Lower pressure seat; 561. Fixing plate; 57. Fixing bolt; 58. Internal pressure surface; 59. Force surface. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-4 The utility model provides a fluorine-lined plug valve, comprising a plug valve body 1, a valve core 2 is movably installed inside the plug valve body 1, and the top of the valve core 2 is fixed to the valve stem 4, while the surface of the plug valve body 1 is screwed and fixed with a valve cover 3, and the valve cover 3 and the valve stem 4 are sealed by a high-efficiency sealing component 5;

[0022] The high-efficiency sealing assembly 5 includes a sealing plug 51, and the sealing plug 51 covers the bottom of the valve stem 4, and the top of the sealing plug 51 is fixed to the pressing plate 52, and the upper side of the pressing plate 52 covers the inner liner 54, the top of the inner liner 54 is fixed to the sealing pressure seat 55, and the surface of the sealing pressure seat 55 covers the lower pressure seat 56, the top of the lower pressure seat 56 is fixed to the fixing plate 561, and four groups of through holes are evenly opened on the outer side of the fixing plate 561, and four groups of screw holes are opened in the middle of the surface of the valve cover 3, and four groups of fixing bolts 57 are respectively passed through the four groups of through holes and screwed and fixed to the inside of the four groups of screw holes.

[0023] Working principle: When in use, the inner liner 54 and the sealing pressure seat 55 are mounted on the outside of the valve stem 4. At this time, the lower pressure seat 56 is pressed down to make it move downward to compress the sealing pressure seat 55. The sealing pressure seat 55 is compressed and its inner wall is tightly attached to the outside of the valve stem 4. The outer wall of the sealing pressure seat 55 is sealed with the inner wall of the sealing groove 53, completing the efficient sealing work between the valve cover 3 and the valve stem 4, improving the sealing performance of the plug valve body 1, and no leakage will occur between the valve cover 3 and the valve stem 4.

[0024] As a preferred embodiment, the sealing plug 51 and the pressing plate 52 are combined together to form a “T”-shaped arrangement, and the plug valve body 1 and the valve cover 3 are sealed by the sealing plug 51 and the pressing plate 52 .

[0025] like Figure 1-4As shown: the sealing plug 51 and the pressing plate 52 are combined together to form a "T"-shaped arrangement, which is placed between the plug valve body 1 and the valve cover 3 and fixed by four sets of fixing bolts. The sealing plug 51 and the pressing plate 52 are deformed under pressure to seal between the plug valve body 1 and the valve cover 3.

[0026] As a preferred embodiment, a sealing groove 53 is opened in the middle of the valve cover 3 , and the sealing groove 53 is adapted to the size of the inner liner 54 , and the inner liner 54 is clamped in the sealing groove 53 .

[0027] The inner liner 54 is clamped in the sealing groove 53 , and the upper part of the inner liner 54 is squeezed and expands outward to fill the sealing groove 53 opened in the valve cover 3 , thereby fully sealing the valve cover 3 and the valve stem 4 .

[0028] As a preferred embodiment, the transverse section of the sealing pressure seat 55 is dovetail-shaped, and the transverse section of the lower pressure seat 56 is dovetail-shaped, and the lower pressure seat 56 moves downward and is clamped on the outer side of the sealing pressure seat 55 and fixed by four sets of fixing bolts 57;

[0029] The lower pressure seat 56 moves downward and is clamped on the outer side of the sealing pressure seat 55 and is fixed by four sets of fixing bolts 57. When the lower pressure seat 56 moves downward, the sealing pressure seat 55 and the inner liner 54 can be squeezed, so that the sealing pressure seat 55 and the inner liner 54 can be tightly and fully fixed and wrapped between the valve stem 4 and the valve cover 3, thereby sealing the valve stem 4 and the valve cover 3.

[0030] As a preferred embodiment, a force-bearing surface 59 is provided on the outer side of the sealing pressure-bearing seat 55 , and an inner pressure surface 58 is provided on the inner wall of the lower pressure seat 56 , and the inner pressure surface 58 is arranged parallel to the force-bearing surface 59 .

[0031] As a preferred embodiment, the inner liner 54 and the sealing pressure seat 55 are both made of rubber material and have a circular axial cross-section, and the lower pressure seat 56 moves downward to squeeze the sealing pressure seat 55 .

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fluorine-lined plug valve, comprising a plug valve body (1), characterized in that: The valve core (2) is movably installed inside the plug valve body (1), and the top of the valve core (2) is fixed to the valve stem (4). At the same time, the valve cover (3) is screwed and fixed to the surface of the plug valve body (1), and the valve cover (3) and the valve stem (4) are sealed by a high-efficiency sealing component (5); The high-efficiency sealing assembly (5) includes a sealing plug (51), and the sealing plug (51) covers the bottom of the valve stem (4), and the top of the sealing plug (51) is fixed to the pressing plate (52), and the upper side of the pressing plate (52) covers the inner lining tube (54), the top of the inner lining tube (54) is fixed to the sealing pressure seat (55), and the surface of the sealing pressure seat (55) covers the lower pressure seat (56), the top of the lower pressure seat (56) is fixed to the fixing plate (561), and four groups of through holes are evenly opened on the outer side of the fixing plate (561), and four groups of screw holes are opened in the middle of the surface of the valve cover (3), and four groups of fixing bolts (57) are respectively passed through the four groups of through holes and screwed and fixed inside the four groups of screw holes.

2. A fluorine-lined plug valve according to claim 1, characterized in that: The sealing plug (51) and the pressing plate (52) are combined together to form a "T"-shaped arrangement, and the plug valve body (1) and the valve cover (3) are sealed by the sealing plug (51) and the pressing plate (52).

3. A fluorine-lined plug valve according to claim 1, characterized in that: A sealing groove (53) is provided in the middle of the valve cover (3), and the size of the sealing groove (53) matches that of the inner liner (54), while the inner liner (54) is clamped inside the sealing groove (53).

4. A fluorine-lined plug valve according to claim 1, characterized in that: The transverse section of the sealing pressure seat (55) is dovetail-shaped, and the transverse section of the lower pressure seat (56) is dovetail-shaped. At the same time, the lower pressure seat (56) moves downward and is clamped on the outer side of the sealing pressure seat (55) and fixed by four sets of fixing bolts (57).

5. The fluorine-lined plug valve according to claim 1, characterized in that: The outer side of the sealing pressure seat (55) is provided with a force surface (59), and the inner wall of the lower pressure seat (56) is provided with an inner pressure surface (58), and the inner pressure surface (58) and the force surface (59) are arranged in parallel.

6. A fluorine-lined plug valve according to claim 1, characterized in that: The inner liner (54) and the sealing pressure seat (55) are both made of rubber material and have a circular axial cross-section. The lower pressure seat (56) moves downward to press the sealing pressure seat (55).

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