Screwing type plug valve

Abstract

The utility model provides a screwing type plug valve which comprises a valve body, a plug cock, a left plug tile, a right plug tile, a valve cover, a sealing ring, a hand wheel, a cap, an upper combined seal and a lower combined seal, the plug cock is arranged in the valve body, the plug tiles are arranged between the plug cock and the valve body, the valve cover fixed with the valve body is arranged at the upper end of the plug cock, and the sealing ring is arranged between the valve cover and the valve body. The upper end of the valve cover is provided with a hand wheel fixed on the cock through a cap, a lower combined seal is arranged between the lower end of the cock and the valve body, and an upper combined seal is arranged between the upper end of the cock and the valve cover. The cock is provided with two semi-cylindrical sealing surfaces which are parallel to the axis of the cock and rotate around the cock shaft in the radial direction, the rotating radiuses of the two semi-cylindrical sealing surfaces are gradually increased or decreased, and the plug tile is provided with tile sealing surfaces corresponding to the semi-cylindrical sealing surfaces of the cock. The plug valve is reasonable in structure, effectively guarantees that the plug valve is not prone to abrasion and clamping in the opening and closing process, is good in sealing performance, improves work reliability, and prolongs service life.

Description

Technical Field

[0001] This utility model relates to a valve, and more particularly to a screw-tight plug valve. Background Technology

[0002] Currently, plug valves are widely used in industries such as petroleum, chemical, power, metallurgy, and papermaking. Traditional plug valves generally use cylindrical seals and consist of a valve body, plug, seal pad, valve cover, and handwheel. In operation, rotating the handwheel on top of the plug rotates the plug, aligning or misaligning the through-hole on the plug with the flow channel of the valve, thus opening or closing the plug valve. Because the plug rubs against the seal pad during rotation, it wears severely and is prone to jamming, preventing rotation. Furthermore, poor sealing can lead to leakage, reducing the reliability of the plug valve and shortening its service life. Although there are now plug valves that are less prone to wear and jamming, their structure is more complex, making use and maintenance inconvenient. Utility Model Content

[0003] To overcome the shortcomings of the existing technology, this utility model provides a screw-type plug valve with a reasonable structure, which is not prone to wear and jamming between the plug and the valve plate, is easy to use and maintain, has good sealing performance, and has a long service life.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: It includes a valve body, a stopcock, a left stopcock, a right stopcock, a valve cover, a sealing ring, a handwheel, a cap, an upper combined seal, a lower combined seal, and a stopcock with a through hole inside the valve body. Left and right stopcocks with through holes are provided between the stopcock and the valve body on their left and right sides. The axes of the through holes of the left and right stopcocks coincide with the axis of the flow channel hole in the valve body. A valve cover fixed to the valve body is provided at the upper end of the stopcock. A sealing ring is provided between the valve cover and the valve body. A cap is provided at the upper end of the valve cover. A handwheel fixed to a stopcock, wherein a lower combined seal is provided between the lower end of the stopcock and the valve body, and an upper combined seal is provided between the upper end of the stopcock and the valve cover; characterized in that: on the stopcock, on both sides of the axis of the stopcock through hole, there are two semi-cylindrical sealing surfaces parallel to the axis of the stopcock, rotating radially around the axis of the stopcock, and the radius of rotation gradually increases or decreases; on the left and right stopcocks, on the inner side of the left and right stopcocks, there are left and right stopcock sealing surfaces corresponding to the semi-cylindrical sealing surfaces of the stopcock.

[0005] The semi-cylindrical sealing surface on the aforementioned plug is either parallel to the plug's axis or not parallel to the plug's axis.

[0006] The semi-cylindrical sealing surface on the aforementioned plug can rotate radially around the plug axis by an angle of 180 degrees, or greater than 180 degrees, or less than 180 degrees.

[0007] The aforementioned plug has two semi-cylindrical sealing surfaces, or it has a cylindrical sealing surface.

[0008] The two semi-cylindrical sealing surfaces on the aforementioned plug are formed by rotating radially around the plug axis, with the radius of rotation gradually increasing or decreasing, or by being radially offset around the plug axis.

[0009] The two semi-cylindrical sealing surfaces formed by the radial rotation around the piston axis, with the rotation radius gradually increasing or decreasing, are formed by rotating clockwise or counterclockwise.

[0010] This utility model has a reasonable structure, which effectively ensures that the sealing surface of the plug valve is not easily worn or jammed during the opening and closing process, and has good sealing performance, thereby improving the working reliability of the plug valve and extending its service life. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the structure of the plug in this utility model;

[0013] Figure 3 for Figure 2 Sectional view along line AA;

[0014] Figure 4 This is a schematic diagram of the structure of the left serpentine in this utility model;

[0015] Figure 5 This is a schematic diagram of the right-hand side valve in this utility model;

[0016] Figure 6 for Figure 4 Cross-sectional view at the DD direction;

[0017] Figure 7 for Figure 5 Cross-sectional view at the EE direction;

[0018] Figure 8 This is a schematic diagram of the valve opening mechanism, including the left and right valve inserts.

[0019] Figure 9 for Figure 8 Cross-sectional view at the BB direction;

[0020] Figure 10 This is a schematic diagram of the valve stopcock, left stopper, and right stopper in this utility model after the valve is closed;

[0021] Figure 11 for Figure 10 Cross-sectional view at the C-axis;

[0022] In the figure: 1 is the valve body, 2 is the left packing washer, 3 is the valve cover, 4 is the handwheel, 5 is the union nut, 6 is the plug cock, 7 is the sealing ring, 8 is the right packing washer, 9 is the upper combined seal, 10 is the lower combined seal, 11 is the sealing surface of the left packing washer, 12 is the semi-cylindrical sealing surface, 13 is the sealing surface of the right packing washer.

[0023] Specific implementation method

[0024] The present utility model will be further described in detail below in conjunction with the accompanying drawings.

[0025] The present utility model includes a valve body 1, a plug cock 6, a left packing washer 2, a right packing washer 8, a valve cover 3, a sealing ring 7, a handwheel 4, a union nut 5, an upper combined seal 9, and a lower combined seal 10. A plug cock 6 with a through hole is provided inside the valve body 1. Left and right packing washers 2 and 8 with through holes are provided between the left and right sides of the plug cock 6 and the valve body 1. The axes of the through holes of the left and right packing washers 2 and 8 coincide with the axis of the flow passage hole of the valve body 1. The upper end of the plug cock 6 is provided with a valve cover 4 fixed to the valve body 1. A sealing ring 7 is provided between the valve cover 4 and the valve body 1. The upper end of the valve cover 4 is provided with a handwheel 4 fixed to the plug cock 6 with a union nut 5. A lower combined seal 10 is provided between the lower end of the plug cock 6 and the valve body 1. An upper combined seal 9 is provided between the upper end of the plug cock 6 and the valve cover 3. On the plug cock 6, on both sides of the axis of the through hole of the plug cock 6, there are provided 2 semi-cylindrical sealing surfaces 12 that are parallel to the axis of the plug cock, rotate radially around the axis of the plug cock, and have a gradually increasing or decreasing rotation radius, as Figure 3 As shown, point O is the central axis of the plug cock 6. C, B, A and C’, B’, A’ respectively rotate 180 degrees clockwise around point O radially, and 2 semi-cylindrical sealing surfaces 12 are formed with a gradually increasing rotation radius. The rotation radii O, C < O, B < O, A; 0, C’ < O, B’ < O, A’ make the rotation radius gradually increase, which helps the 2 semi-cylindrical sealing surfaces 12 to fit and tighten with the sealing surface of the left packing washer 11 and the sealing surface of the right packing washer 13, achieving a better sealing effect. On the left packing washer 2 and the right packing washer 8, on the inner sides of the left packing washer 2 and the right packing washer 8, there are provided the sealing surface of the left packing washer 11 and the sealing surface of the right packing washer 13 corresponding to the semi-cylindrical sealing surface 12 of the plug cock 6, as Figure 6 、 Figure 7Point O is the central axis of the stopcock 6. The axes D, E, D', and E' encircle point O and rotate counterclockwise radially to form the two semi-cylindrical sealing surfaces 12 of the stopcock 6, resulting in a left sealing surface 11 and a right sealing surface 13. The radius of this rotation is O, D > O, E; O, D' > O, E', gradually decreasing the radius of rotation. This helps the semi-cylindrical sealing surfaces 12 to fit tightly with the left and right sealing surfaces 11 and 13, achieving a better sealing effect. The semi-cylindrical sealing surfaces 12 on the stopcock 6 may be parallel to or not parallel to the axis of the stopcock 6. The radial rotation angle of the semi-cylindrical sealing surfaces 12 around the axis of the stopcock 6 is 180 degrees, greater than 180 degrees, or less than 180 degrees. The stopcock 6 may have semi-cylindrical sealing surfaces or cylindrical sealing surfaces, which are formed by radially rotating 360 degrees with a gradually increasing or decreasing radius of rotation. The two semi-cylindrical sealing surfaces 12 on the aforementioned plug 6 are formed by radially rotating around the axis of the plug 6, with the radius of rotation gradually increasing or decreasing, or by radially offsetting the two semi-cylindrical sealing surfaces with the axis of the plug 6 as the center. These two semi-cylindrical sealing surfaces 12, formed by radially rotating around the axis of the plug 6 with the radius of rotation gradually increasing or decreasing, are formed by rotating clockwise or counterclockwise.

[0026] When the plug valve is opened, turning the handwheel 4 clockwise causes the plug 6 to rotate. During the rotation, the radius of rotation of the plug 6 gradually decreases, causing the semi-cylindrical sealing surface 12 on the plug 6 to rotate away from the left and right sealing surfaces 11 and 13, thus aligning the through hole on the plug 6 with the flow channel hole in the valve body 1 and opening the valve. Figure 9 When the valve is opened, the left and right sealing surfaces 11 and 13 do not contact the semi-cylindrical sealing surface 12. Therefore, when the valve is opened, the semi-cylindrical sealing surface 12 does not easily wear down with the left and right sealing surfaces 11 and 13 during the rotation of the stopcock.

[0027] When closing the plug valve, turning handwheel 4 counterclockwise causes plug 6 to rotate. During rotation, the radius of rotation of plug 6 gradually increases, causing the semi-cylindrical sealing surface 12 on plug 6 to fit against the left and right sealing surfaces 11, thus closing the valve. Figure 11 After the valve is closed, the left septum sealing surface 11 and the right septum sealing surface 13 fit together with the semi-cylindrical sealing surface 12, and as the stopcock 6 is rotated, they fit together more and more tightly to achieve the ideal sealing effect.

Claims

1. A screw-tight plug valve, comprising a valve body, a plug, a left plug, a right plug, a valve cover, a sealing ring, a handwheel, a cap, an upper combined seal, a lower combined seal, wherein the valve body has a plug with a through hole, and the left and right sides of the plug are provided with left and right plugs with through holes between them and the valve body, the axes of the through holes of the left and right plugs coincide with the axis of the flow channel hole of the valve body, the upper end of the plug is provided with a valve cover fixed to the valve body, a sealing ring is provided between the valve cover and the valve body, the upper end of the valve cover is provided with a handwheel fixed to the plug by a cap, the lower end of the plug is provided with a lower combined seal between it and the valve body, and the upper end of the plug is provided with an upper combined seal between it and the valve cover; characterized in that: On the plug, on both sides of the plug through-hole axis, there are two semi-cylindrical sealing surfaces that are parallel to the plug axis and rotate radially around the plug axis, with the rotation radius gradually increasing or decreasing; on the left and right stoppers, on the inner side of the left and right stoppers, there are left stopper sealing surfaces and right stopper sealing surfaces corresponding to the semi-cylindrical sealing surfaces of the plug.

2. A screw down globe valve according to claim 1 wherein: The semi-cylindrical sealing surface on the aforementioned plug is either parallel to or not parallel to the axis of the plug.

3. A screw down faucet valve according to claim 1 or 2, characterised in that: The semi-cylindrical sealing surface on the aforementioned plug can rotate radially around the plug axis by an angle of 180 degrees, or greater than 180 degrees, or less than 180 degrees.

4. A screw down faucet valve according to claim 1 or 2, characterised in that: The aforementioned plug has two semi-cylindrical sealing surfaces, or it has a cylindrical sealing surface.

5. A screw down faucet valve according to claim 1 or 2 wherein: The two semi-cylindrical sealing surfaces on the aforementioned plug are formed by rotating radially around the plug axis, with the radius of rotation gradually increasing or decreasing, or by being radially offset around the plug axis.

6. A screw down faucet valve according to claim 1 or 2 wherein: The two semi-cylindrical sealing surfaces formed by the radial rotation around the piston axis, with the rotation radius gradually increasing or decreasing, are formed by rotating clockwise or counterclockwise.

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