Gate valve with high sealing performance

Abstract

The utility model relates to the field of gate valves, in particular to a high-sealing-performance gate valve. The technical problem to be solved by the utility model is to provide the gate valve with high sealing performance, which can improve the overall sealing effect of the valve, enable the valve to have good sealing performance and prevent water leakage. A gate valve with high sealing performance comprises a valve body, a valve cover, a sealing gasket, a top cover, a valve rod fixing block, a shaft sleeve, a valve rod, a hand wheel, a valve rod nut, a sealing seat ring, a gate plate, a locking pin, sealing filler, a dustproof cover and a sealing plug. According to the valve, the overall sealing effect of the valve is improved, the valve has good sealing performance, and the effect of preventing water flow leakage is achieved.

Description

Technical Field

[0001] The utility model relates to the field of gate valves, in particular to a high-sealing gate valve. Background Art

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and adjust and control the parameters of the conveying medium. Valves used in fluid control systems come in a wide variety of varieties and specifications, from the simplest stop valves to the various valves used in extremely complex automatic control systems. The elastic seated gate valve is one of the many pipeline valves, mainly used to control the forced flow stop of liquid media in pipelines and is widely used. The opening and closing parts of the elastic seated gate valve are gate plates, and the movement direction of the gate plates is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled.

[0003] As the population base continues to expand, people's demand for water resources is also increasing. The elastic seat seal gate valve is a device used for water supply, but the existing elastic seat seal gate valve has some shortcomings. When the medium flows through the valve cavity, water leakage will occur due to the poor sealing of the elastic seat seal gate valve. Therefore, it is urgent to develop a high-sealing gate valve that can increase the overall sealing effect of the valve, make the valve have good sealing properties, and prevent water leakage. Utility Model Content

[0004] In order to overcome some shortcomings of the existing elastic seat sealing gate valve, when the medium flows through the valve cavity, water leakage may occur due to the poor sealing of the elastic seat sealing gate valve. The technical problem to be solved by the utility model is to provide a high-sealing gate valve that can increase the overall sealing effect of the valve, make the valve have good sealing performance, and prevent water leakage.

[0005] The utility model is achieved by the following specific technical means:

[0006] A high-sealing gate valve, comprising a valve body; a valve cover is fixedly installed on the upper end of the valve body by bolts; a top cover is fixedly installed on the upper end of the valve cover by bolts; an axial hole is arranged at the center of the top cover, a valve stem fixing block is fixedly installed in the axial hole; an axial hole is arranged at the center of the valve cover, a shaft sleeve is fixedly installed in the shaft hole; the valve stem is rotatably fixed to the valve cover and the top cover by the valve stem fixing block and the shaft sleeve; and the upper end of the valve stem extends above the top cover, and the lower end of the valve stem extends into the valve body; a hand wheel is fixedly installed on the upper end of the valve stem by bolts; a valve stem nut is meshedly connected to the lower end of the valve stem; a gate plate is fixedly connected to the lower end of the valve stem by the valve stem nut, and a locking pin is arranged at the fixed connection between the gate plate and the valve stem nut; a water through hole is arranged at the lower end of the valve body, and a sealing seat ring matching the sealing surfaces on both sides of the gate plate is fixedly arranged at the water through hole;

[0007] A rubber sealing pad is provided at the connection between the valve body and the valve cover; a sealing filler is also provided above the shaft sleeve provided in the shaft hole of the valve cover, and the sealing filler is fixedly provided between the valve stem fixing block and the shaft sleeve; a sealing cover is also fixedly provided at the connection between the shaft hole provided in the top cover and the valve stem; a sand accumulation groove is also provided at the lower end of the water hole provided in the valve body, and the sand accumulation groove is located between the two sealing seat rings; and a sand discharge hole penetrating the valve body is also provided on the lower end surface of the sand accumulation groove, and a sealing plug is fixedly installed at the sand discharge hole;

[0008] The upper end of the gate plate is provided with a boss that cooperates with the valve cover cavity, and a sealing rubber ring is provided at the cooperation position between the boss and the valve cover cavity; the two side surfaces of the lower end of the gate plate are sealing surfaces, and the sealing surfaces are also provided with an elastic rubber layer that elastically seals with the sealing seat ring.

[0009] Furthermore, the side of the sealing seat ring that contacts the gate plate is a sealing surface, and the sealing surface of the sealing seat ring has a high surface roughness.

[0010] Furthermore, the sealing surfaces on both sides of the lower end of the gate plate are arranged in an inclined taper, and the width of the upper end is greater than the width of the lower end; the corresponding sealing seat ring that seals with the gate plate is also arranged inclined; the sealing surfaces of the sealing seat ring and the gate plate are made into a wedge shape, and the sealing surface of the gate plate and the sealing surface of the sealing seat ring can fit tightly to achieve a good sealing effect. At the same time, after the sealing surface is worn out due to long-term use, the wedge-shaped gate plate sealing surface can adjust the sealing position by itself so that the sealing effect will not be weakened.

[0011] Furthermore, the width of the lower end of the gate plate is smaller than the width of the sand accumulation groove provided in the water hole of the valve body; when the gate plate is sealed, the lower end of the gate plate can extend into the sand accumulation groove, so that the sealing surface of the gate plate and the sealing surface of the sealing seat ring can fit closely, achieving a good sealing effect.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The utility model achieves the effect of increasing the overall sealing effect of the valve, making the valve have good sealing performance and preventing water leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0015] Figure 2 It is a schematic diagram of the main structure of the utility model.

[0016] Figure 3 It is a cross-sectional structural schematic diagram of the utility model.

[0017] Figure 4 It is a schematic diagram of the cross-sectional structure of the gate of the utility model.

[0018] The markings in the accompanying drawings are: 1-valve body, 2-valve cover, 3-sealing gasket, 4-top cover, 5-valve stem fixing block, 6-shaft sleeve, 7-valve stem, 8-handwheel, 9-valve stem nut, 10-sealing seat ring, 11-gate, 12-locking pin, 13-sealing packing, 14-dust cover, 15-sealing plug, 111-sealing rubber ring, 112-elastic rubber layer. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings: Example

[0020] A high sealing gate valve, such as Figure 1-4 As shown, it comprises a valve body 1; a valve cover 2 is fixedly installed on the upper end of the valve body 1 by bolts; a top cover 4 is fixedly installed on the upper end of the valve cover 2 by bolts; an axial hole is arranged at the center of the top cover 4, and a valve stem fixing block 5 is fixedly installed in the axial hole; an axial hole is arranged at the center of the valve cover 2, and a shaft sleeve 6 is fixedly installed in the shaft hole; a valve stem 7 is rotatably fixed on the valve cover 2 and the top cover 4 through the valve stem fixing block 5 and the shaft sleeve 6; and the upper end of the valve stem 7 extends above the top cover 4, and the lower end of the valve stem 7 extends into the valve body 1; a hand wheel 8 is fixedly installed on the upper end of the valve stem 7 by bolts; a valve stem nut 9 is meshedly connected at the lower end of the valve stem 7; a gate plate 11 is fixedly connected to the lower end of the valve stem 7 by the valve stem nut 9, and a locking pin 12 is arranged at the fixed connection between the gate plate 11 and the valve stem nut 9; a water through hole is arranged at the lower end of the valve body 1, and a sealing seat ring 10 matching the sealing surfaces on both sides of the gate plate 11 is fixedly arranged at the water through hole;

[0021] A rubber sealing pad 3 is provided at the connection between the valve body 1 and the valve cover 2; a sealing packing 13 is also provided above the shaft sleeve 6 provided in the shaft hole of the valve cover 2, and the sealing packing 13 is fixedly provided between the valve stem fixing block 5 and the shaft sleeve 6; a sealing cover is also fixedly provided at the connection between the shaft hole provided in the top cover 4 and the valve stem 7; a sand accumulation groove is also provided at the lower end of the water hole provided in the valve body 1, and the sand accumulation groove is located between the two sealing seat rings 10; and a sand discharge hole penetrating the valve body 1 is also provided on the lower end surface of the sand accumulation groove, and a sealing plug 15 is fixedly installed at the sand discharge hole;

[0022] The upper end of the gate plate 11 is provided with a boss that cooperates with the cavity of the valve cover 2, and a sealing rubber ring 111 is provided at the cooperation between the boss and the cavity of the valve cover 2; the two side surfaces of the lower end of the gate plate 11 are sealing surfaces, and the sealing surfaces are also provided with an elastic rubber layer 112 that elastically seals with the sealing seat ring 10.

[0023] Working principle:

[0024] When in use, the gate valve is fixed between the two pipes through the flange of the valve body 1, and water can flow from one pipe to the other pipe. The valve stem 7 is driven to rotate by turning the hand wheel 8. The rotation of the valve stem 7 drives the valve stem nut 9 to move up and down, thereby driving the gate plate 11 threadedly fixed to the valve stem 7 to move up and down to control the opening and closing of the water hole, thereby controlling the circulation and blocking of the water flow.

[0025] In the utility model, a boss matched with the cavity of the valve cover 2 is arranged at the upper end of the gate plate 11, and a sealing rubber ring 111 is arranged at the matching position of the boss and the cavity of the valve cover 2 to prevent water from flowing into the cavity of the valve cover 2 from the water through hole when the water through hole of the valve body 1 is opened; at the same time, a rubber sealing pad 3 is arranged at the connection between the valve body 1 and the valve cover 2 to prevent water entering the cavity of the valve cover 2 from leaking from the connection between the valve body 1 and the valve cover 2; a sealing filler 13 is also arranged in the shaft hole at the upper end of the valve cover 2 to prevent water entering the cavity of the valve cover 2 from leaking from the connection between the shaft hole at the upper end of the valve cover 2 and the valve stem 7; and the valve obtains high sealing performance through multiple seals.

[0026] The lower end of the water hole of the valve body 1 is also provided with a sand accumulation groove, which is located between the two sealing seat rings 10; the granular sand contained in the water flow can be accumulated in the sand accumulation groove to prevent the sand from adhering to the sealing surface, causing wear on the sealing surface and affecting the sealing of the gate valve; and a sand discharge hole penetrating the valve body 1 is also provided on the lower end surface of the sand accumulation groove, and a sealing plug 15 is fixedly installed at the sand discharge hole; the sand in the sand accumulation groove can be discharged through the sand discharge hole to prevent excessive accumulation of sand from affecting the sealing effect of the sealing gate plate 11; the sealing surfaces on both sides of the lower end of the gate plate 11 are arranged in an inclined taper, and the width of the upper end is greater than the width of the lower end; The sealing seat ring 10 that is sealed with the gate plate 11 is also tilted; the sealing surfaces of the sealing seat ring 10 and the gate plate 11 are wedge-shaped, and the sealing surface of the gate plate 11 and the sealing surface of the sealing seat ring 10 can fit tightly to achieve a good sealing effect. At the same time, after the sealing surface is worn out after long-term use, the sealing surface of the wedge-shaped gate plate 11 can adjust the sealing position by itself so that the sealing effect will not be weakened; at the same time, elastic rubber layers 112 are provided on the sealing surfaces on both sides of the lower end of the gate plate 11. When the gate plate 11 contacts the sealing seat ring 10, the elastic rubber layer 112 is squeezed to deform the elastic rubber layer 112 and fully contact the sealing surface to achieve high sealing performance.

[0027] Although the present disclosure has been described in detail with reference to the exemplary embodiments, the present disclosure is not limited thereto, and it will be apparent to those skilled in the art that various modifications and changes may be made thereto without departing from the scope of the present disclosure.

Claims

1. A high-sealing gate valve, comprising a valve body (1); a valve cover (2) is fixedly mounted on the upper end of the valve body (1) by means of bolts; a top cover (4) is fixedly mounted on the upper end of the valve cover (2) by means of bolts; an axial hole is arranged at the center of the top cover (4), a valve stem fixing block (5) is fixedly mounted in the axial hole; an axial hole is arranged at the center of the valve cover (2), a shaft sleeve (6) is fixedly mounted in the axial hole; a valve stem (7) is rotatably fixed to the valve cover (2) and the top cover (4) by means of the valve stem fixing block (5) and the shaft sleeve (6); and the upper end of the valve stem (7) extends to the top cover Above the cover (4), the lower end of the valve stem (7) extends into the valve body (1); the upper end of the valve stem (7) is fixedly mounted with a hand wheel (8) by means of bolts; the lower end of the valve stem (7) is meshedly connected with a valve stem nut (9); the lower end of the valve stem (7) is fixedly connected with a gate plate (11) by means of the valve stem nut (9), and a locking pin (12) is provided at the fixed connection between the gate plate (11) and the valve stem nut (9); the lower end of the valve body (1) is provided with a water through hole, and a sealing seat ring (10) is fixedly provided at the water through hole and matches the sealing surfaces on both sides of the gate plate (11); It is characterized in that A rubber sealing pad (3) is provided at the connection between the valve body (1) and the valve cover (2); a sealing packing (13) is also provided above the shaft sleeve (6) provided in the shaft hole of the valve cover (2), and the sealing packing (13) is fixedly provided between the valve stem fixing block (5) and the shaft sleeve (6); a sealing cover is also fixedly provided at the connection between the shaft hole provided in the top cover (4) and the valve stem (7); a sand accumulation groove is also provided at the lower end of the water through hole provided in the valve body (1), and the sand accumulation groove is located between the two sealing seat rings (10); and a sand discharge hole penetrating the valve body (1) is also provided on the lower end surface of the sand accumulation groove, and a sealing plug (15) is fixedly installed at the sand discharge hole; The gate plate (11) has an upper end provided with a boss that cooperates with the valve cover (2) cavity, and a sealing rubber ring (111) is provided at the place where the boss cooperates with the valve cover (2) cavity; the two side surfaces of the lower end of the gate plate (11) are sealing surfaces, and the sealing surfaces are also provided with an elastic rubber layer (112) that cooperates with the sealing seat ring (10) in an elastic seal.

2. A high sealing gate valve according to claim 1, characterized in that: The side of the sealing seat ring (10) that contacts the gate plate (11) is a sealing surface, and the sealing surface of the sealing seat ring (10) has a high surface roughness.

3. A high sealing gate valve according to claim 1, characterized in that: The sealing surfaces provided on both sides of the lower end of the gate plate (11) are arranged in an inclined taper, and the width of the upper end is greater than the width of the lower end; correspondingly, the sealing seat ring (10) that seals with the gate plate (11) is also arranged inclined.

4. A high sealing gate valve according to claim 1, characterized in that: The width of the lower end of the gate plate (11) is smaller than the width of the sand accumulation groove provided in the water through hole of the valve body (1).

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