Low-temperature C-shaped wear-resistant ball valve

Abstract

The utility model discloses a low-temperature C-shaped wear-resistant ball valve, and belongs to the field of valves. Comprising a valve body, a valve cover fixedly installed on the valve body, a valve rod rotationally installed on the valve cover, a valve element rotationally installed in the valve body and fixedly connected with the valve rod, and an annular valve seat fixedly installed at one port of the valve body and used for being matched with the valve element to seal a passage. In order to prevent the valve seat and the valve body from being clamped, the valve element is a C-shaped hemisphere of a double-eccentric structure, the closed end of the annular valve seat is attached to the protruding face of the valve element, and the other end of the annular valve seat is in threaded connection with the valve body. According to the low-temperature C-shaped wear-resisting ball valve, the threaded connection type annular valve seat is adopted, the problem that a pre-pressing type valve seat is stuck is solved, meanwhile, the C-shaped hemispheroid valve element of a double-eccentric structure is adopted to be matched with the annular valve seat for use, friction between the valve element and the valve body during rotation is avoided, and therefore the service life is longer.

Description

Technical Field

[0001] The utility model relates to the field of valves, in particular to a low-temperature C-type wear-resistant ball valve. Background Art

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and adjust and control the parameters (temperature, pressure, and flow) of the conveying medium. According to their functions, they can be divided into shut-off valves, check valves, regulating valves, etc.

[0003] A Chinese utility model patent with publication number CN207961585U discloses a hemispherical ball valve, which includes a valve body, a hemispherical valve core is provided in the valve body, an annular valve seat is provided on the valve body tube wall, and a plurality of wear compensation devices are symmetrically provided on the valve body, the wear compensation device includes a sleeve sealedly connected to the valve body, a pressure column and a steel ball are installed in the sleeve from top to bottom, a semicircular notch is formed at the lower part of the sleeve near the valve seat, the steel ball is exposed from the notch of the sleeve, the exposed part of the steel ball abuts against the inclined surface of the flange on the valve seat, a nut with a cover is screwed on the sleeve, and tightening the nut can move the valve seat toward the valve core.

[0004] The valve seat and the valve body of the above utility model are detachably connected. Although the tightness of the valve seat relative to the valve core can be adjusted by the wear compensation device, there is a possibility that the valve seat is stuck on the valve body.

[0005] Therefore, a low-temperature C-type wear-resistant ball valve is provided to solve the above problems. Utility Model Content

[0006] 1. Technical issues to be resolved

[0007] The utility model provides a low-temperature C-type wear-resistant ball valve, aiming to solve the problem that the rear end of the existing semi-ball valve seat is easily stuck due to pre-compression with a spring or flexible graphite as mentioned in the background technology.

[0008] (II) Technical solution

[0009] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a low-temperature C-type wear-resistant ball valve, comprising a valve body, a valve cover fixedly mounted on the valve body, a valve stem rotatably mounted on the valve cover, a valve core rotatably mounted in the valve body and fixedly connected to the valve stem, and an annular valve seat fixedly mounted at one of the ports of the valve body for cooperating with the valve core to close a passage.

[0010] In order to avoid the valve seat and the valve body from getting stuck, the valve core is a C-shaped hemispherical body with a double eccentric structure. The closed end of the annular valve seat fits with the convex surface of the valve core, and the other end is screwed to the valve body. A screw-on valve seat is adopted, which eliminates the spring and flexible graphite pre-compression sealing structure behind the conventional ball valve seat, thus solving the worry of valve seat getting stuck.

[0011] Preferably, in order to allow only the protruding surface of the valve core to contact the annular valve seat and avoid friction between the valve core and the valve body, the end of the valve core close to the valve stem is fixedly connected to a connecting shaft, and the other end of the valve core is fixedly connected to a fixed shaft, wherein the axes of the connecting shaft and the fixed shaft both deviate toward the direction close to the protruding surface of the valve core and remain consistent.

[0012] Preferably, in order to improve the hardness, the inner and outer surfaces of the valve core and the outer surfaces of the connecting shaft and the fixed shaft are all sprayed with tungsten carbide with a thickness of 0.30-0.35 and a Rockwell hardness of about 71.

[0013] Preferably, in order to facilitate the valve stem to drive the valve core to rotate, the connecting shaft is fixedly connected to the valve stem.

[0014] Preferably, in order to stabilize the valve core in the valve body, the fixed shaft is rotatably connected to the valve body.

[0015] Preferably, in order to facilitate disassembly and maintenance, one end of the valve body away from the fixed axis is fixedly connected to a locking bolt that passes through the corresponding four corners of the valve cover, and a lock nut is threaded on the locking bolt.

[0016] Preferably, in order to ensure the sealing of the valve body, a sealing member is sleeved on the outside of the valve stem at a position corresponding to the lower portion of the valve cover, and the valve stem is rotatably connected to the sealing member.

[0017] (III) Beneficial effects

[0018] The low-temperature C-type wear-resistant ball valve adopts a screw-on annular valve seat, which solves the problem of the pre-pressed valve seat getting stuck. At the same time, a C-type hemispherical valve core with a double eccentric structure is used in conjunction with an annular valve seat to avoid friction between the valve core and the valve body when the valve core rotates, thus extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a low-temperature C-type wear-resistant ball valve;

[0020] Figure 2 It is a schematic diagram of the internal sectional three-dimensional structure of a low-temperature C-type wear-resistant ball valve;

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of a C-type hemispheric valve in a low-temperature C-type wear-resistant ball valve.

[0022] In the figure:

[0023] 1. Valve body; 11. Lock bolt; 12. Lock nut; 2. Valve cover; 3. Valve stem; 4. Valve core; 41. Connecting shaft; 42. Fixed shaft; 5. Annular valve seat; 6. Sealing element. DETAILED DESCRIPTION

[0024] 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.

[0025] See also Figure 1 , Figure 2 and Figure 3 The utility model provides a technical solution: a low-temperature C-type wear-resistant ball valve, comprising a valve body 1, a valve cover 2 fixedly mounted on the valve body 1, a valve stem 3 rotatably mounted on the valve cover 2, a valve core 4 rotatably mounted in the valve body 1 and fixedly connected to the valve stem 3, and an annular valve seat 5 fixedly mounted at one of the ports of the valve body 1 for cooperating with the valve core 4 to close a passage. The valve core 4 is a C-type hemispherical body with a double eccentric structure. The closed end of the annular valve seat 5 fits with the convex surface of the valve core 4, and the other end is screwed to the valve body 1.

[0026] One end of the valve core 4 close to the valve stem 3 is fixedly connected to a connecting shaft 41, and the other end of the valve core 4 is fixedly connected to a fixed shaft 42, the connecting shaft 41 is fixedly connected to the valve stem 3, and the fixed shaft 42 is rotatably connected to the valve body 1, wherein the axes of the connecting shaft 41 and the fixed shaft 42 deviate toward the direction close to the protruding surface of the valve core 4 and remain consistent.

[0027] When in use, the valve core 4 is driven to rotate by the valve stem 3 to drive the connecting shaft 41. Since the valve core 4 is a C-shaped hemisphere and the axis of the C-shaped hemisphere deviates toward the direction close to the convex surface of the valve core 4, the valve core 4 will not contact the inner wall of the chamber of the valve body 1 when rotating, thereby avoiding friction. At the same time, since the closed end of the annular valve seat 5 contacts the convex surface of the valve core 4, the closed end of the annular valve seat 5 protrudes toward the inside of the valve body 1. When the hemispherical convex surface of the valve core 4 rotates and contacts the closed end of the annular valve seat 5, it begins to gradually form a closure with continued rotation, so that the valve is closed. After continuing to rotate the valve stem 3 or rotating the valve stem 3 in the opposite direction, the valve is gradually unsealed and opened.

[0028] Furthermore, the inner and outer surfaces of the valve core 4 and the outer surfaces of the connecting shaft 41 and the fixed shaft 42 are all sprayed with tungsten carbide, with a thickness of 0.30-0.35 and a Rockwell hardness of approximately 71; by spraying tungsten carbide on the inner and outer surfaces of the valve core 4 and the outer surfaces of the connecting shaft 41 and the fixed shaft 42, the overall hardness is increased and the service life is extended.

[0029] Furthermore, one end of the valve body 1 away from the fixed axis 42 is fixedly connected with a locking bolt 11 that passes through the valve cover 2 at the corresponding four corners, and a lock nut 12 is threaded on the locking bolt 11; the valve cover 2 is locked to the valve body 1 by the locking nut 12 and the locking bolt 11, which is convenient for disassembly and assembly, so that the valve body 1, valve cover 2, valve stem 3 and valve core 4 can be disassembled for inspection and replacement during maintenance.

[0030] It should be added that a sealing member 6 is sleeved on the outside of the valve stem 3 at a position corresponding to the lower part of the valve cover 2 , and the valve stem 3 is rotatably connected to the sealing member 6 ; the sealing member 6 can ensure sealing between the valve cover 2 and the valve body 1 .

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A low-temperature C-type wear-resistant ball valve, comprising a valve body (1), a valve cover (2) fixedly mounted on the valve body (1), a valve stem (3) rotatably mounted on the valve cover (2), a valve core (4) rotatably mounted in the valve body (1) and fixedly connected to the valve stem (3), and an annular valve seat (5) fixedly mounted at one port of the valve body (1) for cooperating with the valve core (4) to close a passage, characterized in that: The valve core (4) is a C-shaped hemispherical body with a double eccentric structure; the closed end of the annular valve seat (5) is fitted with the convex surface of the valve core (4), and the other end is screwed to the valve body (1).

2. A low temperature C-type wear-resistant ball valve according to claim 1, characterized in that: One end of the valve core (4) close to the valve stem (3) is fixedly connected to a connecting shaft (41), and the other end of the valve core (4) is fixedly connected to a fixing shaft (42), wherein the axes of the connecting shaft (41) and the fixing shaft (42) both deviate toward a direction close to the protruding surface of the valve core (4) and remain consistent.

3. A low temperature C-type wear-resistant ball valve according to claim 2, characterized in that: The inner and outer surfaces of the valve core (4) and the outer surfaces of the connecting shaft (41) and the fixed shaft (42) are all sprayed with tungsten carbide with a thickness of 0.30-0.35 and a Rockwell hardness of about 71.

4. A low temperature C-type wear-resistant ball valve according to claim 3, characterized in that: The connecting shaft (41) is fixedly connected to the valve stem (3).

5. A low temperature C-type wear-resistant ball valve according to claim 4, characterized in that: The fixed shaft (42) is rotatably connected to the valve body (1).

6. A low temperature C-type wear-resistant ball valve according to claim 5, characterized in that: One end of the valve body (1) away from the fixed shaft (42) is fixedly connected to a locking bolt (11) penetrating the corresponding four corners of the valve cover (2), and a lock nut (12) is screwed onto each of the locking bolts (11).

7. A low temperature C-type wear-resistant ball valve according to claim 6, characterized in that: A sealing member (6) is sleeved on the outside of the valve stem (3) at a position corresponding to the lower portion of the valve cover (2), and the valve stem (3) is rotatably connected to the sealing member (6).

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