Stainless steel ball valve achieving self-sealing through water pressure

Abstract

The utility model relates to the technical field of ball valves, and provides a stainless steel ball valve capable of achieving self-sealing through water pressure, which is reasonable in structural design and good in self-sealing performance and comprises a valve body, a valve bonnet, a valve core, a valve rod, a gland and an execution piece. A first V-shaped sealing ring used for deforming towards the two sides under the water pressure effect to abut against the valve bonnet and the valve body so as to enhance the sealing performance is embedded in the first mounting groove, and the direction of the v-shaped side of the first V-shaped sealing ring is opposite to the water leakage direction. A first flow guide groove used for guiding water to flow into a V-shaped groove of the V-shaped sealing ring so as to prevent the situation that the sealing effect is affected due to the fact that the v-shaped side is folded inwards under the action of the water is formed in the position, facing the v-shaped side of the first V-shaped sealing ring, of the valve bonnet. A second sealing structure is arranged between the valve rod and the valve body; third sealing structures are arranged between the valve element and the valve body and between the valve element and the valve bonnet respectively.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to a stainless steel ball valve which utilizes water pressure to self-seal. Background Art

[0002] like Figure 1 As shown, the ball valve mainly includes a valve body '1, a valve bonnet '2, a valve core '3, a valve stem '4, a gland '5, and an actuator '6. The valve bonnet is threadedly connected to the valve body, the valve core is set in the valve core cavity formed by the valve body and the valve bonnet, the valve stem is inserted into the valve core, the gland presses the valve stem, and the actuator is installed on the upper end of the valve stem. Teflon gaskets '7 are respectively provided on the inner wall of the valve body and the inner wall of the valve bonnet at both ends of the valve core to ensure the sealing of the valve core during use. A sealing ring '8 is provided between the mating end faces of the valve bonnet and the valve body to limit the outflow of water along the gap between the valve body and the valve bonnet. During the use of the ball valve, if the water pressure is too high or after long-term use, water will still penetrate the valve body outside along the thread gap between the valve body and the valve bonnet through the valve bonnet sealing ring. Therefore, when assembling the accessories, the manufacturer will apply glue to the threaded connection of the valve bonnet to further prevent water leakage by filling the thread gap. This not only increases the complexity of valve assembly, but also increases manufacturing costs.

[0003] This case arises in order to solve the above problems. Utility Model Content

[0004] Therefore, in order to solve the above problems, the present invention proposes a stainless steel ball valve which is self-sealed by water pressure and has reasonable structural design and good self-sealing performance.

[0005] In order to solve the above technical problems, the solution adopted by the present invention is: a stainless steel ball valve that uses water pressure to self-seal, including a valve body, a valve bonnet, a valve core, a valve stem, a pressure cover, and an actuator. A first mounting groove is provided on the right end surface of the valve body, and a first V-shaped sealing ring is embedded in the first mounting groove for deforming to both sides against the valve bonnet and valve body under the action of water pressure to enhance the sealing performance. The V-shaped side of the first V-shaped sealing ring is opposite to the direction of water leakage. The valve bonnet is provided with a first guide groove located at the V-shaped side of the first V-shaped sealing ring to guide water to flow into the V-shaped groove of the V-shaped sealing ring to avoid the V-shaped side from contracting inward under the action of water and affecting the sealing effect; a second sealing structure is provided between the valve stem and the valve body; a third sealing structure is provided between the valve core and the valve body and the valve bonnet respectively.

[0006] Further improvements are: the second sealing structure includes a second mounting groove opened at the lower end of the valve stem, and the second mounting groove is sleeved with at least one second V-shaped sealing ring for deforming to both sides against the valve plate and valve body under the action of water pressure to enhance the sealing performance, the V-shaped side of the second V-shaped sealing ring faces the lower end of the valve stem, and the lower groove wall of the first mounting groove is provided with a second guide groove for guiding water to flow into the V-shaped groove of the V-shaped sealing ring to avoid the V-shaped side from contracting inward under the action of water and affecting the sealing effect.

[0007] Further improvements are: the third sealing structure includes a first polytetrafluoroethylene gasket, a second polytetrafluoroethylene gasket, and an elastic gasket, the inner end face of the elastic gasket is bonded to the first polytetrafluoroethylene gasket, and the outer end face is bonded to the second polytetrafluoroethylene gasket to form a combined sealing ring that adapts to the rotational deformation of the valve core to achieve a combination of soft and hard seals to improve the sealing performance, and a third installation groove for fixedly installing the combined sealing ring is respectively provided on the inner wall of the valve body and the inner wall of the valve cap.

[0008] A further improvement is that a first through hole and a second through hole are respectively provided in the middle of the elastic gasket and the second polytetrafluoroethylene gasket, and a limiting column is integrally provided on the outer end surface of the first polytetrafluoroethylene gasket, which can extend into the first through hole and the second through hole and abut against the wall of the third mounting groove to limit the maximum compression of the elastic gasket and ensure the sealing effect. The vertical distance between the limiting column and the groove wall of the third mounting groove is the maximum deformation amount of the flexible deformation of the combined sealing ring.

[0009] A further improvement is that the outer diameter of the elastic gasket is smaller than the outer diameters of the first and second polytetrafluoroethylene gaskets to form a deformation gap for the elastic gasket to deform outward.

[0010] A further improvement is that the actuator is a manual drive element or an electric drive element.

[0011] A further improvement is that the valve body, valve cap and valve core are all made of food-grade stainless steel.

[0012] By adopting the above technical solution, the beneficial effects of the utility model are:

[0013] 1. In this case, the sealing ring between the valve body and the valve bonnet in the existing ball valve is replaced with a first V-shaped sealing ring, so that the ball valve in this case can achieve self-sealing under the action of water pressure. The greater the pressure, the better the sealing effect. In addition, the first guide groove opened at the opening of the V-shaped groove can first concentrate the water and then guide it into the V-shaped groove, avoiding the water first entering the side gap of the V-shaped sealing ring and pushing the V-shaped groove inward to affect the sealing effect.

[0014] 2. In order to prevent water from flowing along the valve stem to the outside of the valve body, a second installation groove is opened on the valve stem in this case, and a second V-shaped sealing ring is installed. A second guide groove is also opened on the inner wall of the second installation groove at the V-shaped groove. Under the action of the second guide groove, water is first concentrated in the second guide groove before leaking, and then flows into the second V-shaped sealing ring, expanding the sealing ring to improve the sealing effect of the sealing ring. The greater the water pressure, the better the sealing effect.

[0015] 3. In this case, the original PTFE gasket of the ball valve is replaced with a combined sealing ring. The combined sealing ring consists of a first PTFE gasket, a second PTFE gasket, and an elastic gasket. The inner end face of the elastic gasket is bonded to the first PTFE gasket, and the outer end face is bonded to the second PTFE gasket. The elastic gasket provides flexible deformation to avoid a water gap between the first PTFE gasket and the valve core, preventing water from flowing to the first V-shaped sealing ring and the second V-shaped sealing ring, thereby further improving the overall sealing of the valve.

[0016] 4. The limiting column integrally provided on the first PTFE gasket limits the maximum deformation of the elastic gasket to prevent the elastic gasket from being excessively deformed and affecting the valve core seal.

[0017] 5. The deformation gap formed between the outer edge of the elastic gasket and the outer edges of the first PTFE gasket and the second PTFE gasket provides deformation space for the elastic gasket, which is conducive to the active deformation of the elastic gasket and improves the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the prior art in the background art.

[0019] Figure 2 The utility model is a schematic diagram of the internal structure of a stainless steel ball valve that uses water pressure to self-seal.

[0020] Figure 3 yes Figure 2 A magnified view of the local structure at point A.

[0021] Figure 4 yes Figure 2 A magnified view of the local structure at point B in the middle. DETAILED DESCRIPTION

[0022] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0023] refer to Figures 1 to 4The embodiment of the present invention discloses a stainless steel ball valve that uses water pressure to self-seal, including a valve body 10, a valve bonnet 11, a valve core 12, a valve stem 13, a gland 14, and an actuator 15. The valve body 10, the valve bonnet 11, and the valve core 12 are all made of food-grade stainless steel. The actuator 15 is a manual drive component or an electric drive component. A first mounting groove 16 is provided inwardly on the right end face of the valve body 10, and a first V-shaped sealing ring 17 is embedded in the first mounting groove 16 for deforming to both sides against the valve cap 11 and the valve body 10 under the action of water pressure to enhance the sealing performance. The V-shaped side of the first V-shaped sealing ring 17 is opposite to the direction of water leakage, and the left and right end faces of the first V-shaped sealing ring 17 are respectively pressed against the end face of the valve body 10 and the end face of the valve cap 11. A first guide groove 18 is provided on the valve cap 11 at the position facing the V-shaped side of the first V-shaped sealing ring 17 for guiding water to flow into the V-shaped groove of the V-shaped sealing ring to avoid the V-shaped side from contracting inwardly under the action of water and affecting the sealing effect; a second sealing structure is provided between the valve stem 13 and the valve body 10; and a third sealing structure is provided between the valve core 12 and the valve body 10 and the valve cap 11 respectively.

[0024] The second sealing structure includes a second mounting groove 19 with an inwardly reduced diameter opened at the lower end of the valve stem 13, and the second mounting groove 19 is sleeved with at least one second V-shaped sealing ring 20 for deforming to both sides against the valve plate and the valve body 10 under the action of water pressure to enhance the sealing performance. The V-shaped side of the second V-shaped sealing ring 20 faces the lower end of the valve stem 13, and the lower groove wall of the first mounting groove 16 is provided with a second guide groove 21 for guiding water to flow into the V-shaped groove of the V-shaped sealing ring to avoid the V-shaped side from shrinking inward under the action of water and affecting the sealing effect.

[0025] The third sealing structure includes a first PTFE gasket 22, a second PTFE gasket 23, and an elastic gasket 24. The inner end surface of the elastic gasket 24 is bonded to the first PTFE gasket 22, and the outer end surface is bonded to the second PTFE gasket 23, forming a combined sealing ring 25 that adapts to the rotational deformation of the valve core 12 to achieve a combined soft and hard seal and improve sealing performance. A third mounting groove 26 for fixedly mounting the combined sealing ring 25 is respectively defined on the inner wall of the valve body 10 and the inner wall of the valve cap 11. A first through hole and a second through hole are respectively defined in the middle of the elastic gasket 24 and the second PTFE gasket 23. A limiting post 27 is integrally formed on the outer end surface of the first PTFE gasket 22, which can extend into the first and second through holes and abut against the wall of the third mounting groove 26 to limit the maximum compression of the elastic gasket 24 and ensure a sealing effect. The vertical distance between the limiting post 27 and the wall of the third mounting groove 26 is the maximum deformation of the combined sealing ring 25. The outer diameter of the elastic gasket 24 is smaller than the outer diameters of the first PTFE gasket 22 and the second PTFE gasket 23 to form a deformation gap 28 for the elastic gasket 24 to deform outward.

[0026] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection claimed in the present invention is defined by the attached claims and their equivalents.

Claims

1. A stainless steel ball valve that uses water pressure to self-seal, including a valve body, a valve bonnet, a valve core, a valve stem, a gland, and an actuator, characterized in that: A first installation groove is provided on the right end surface of the valve body, and a first V-shaped sealing ring is embedded in the first installation groove for deforming to both sides under the action of water pressure to press against the valve cap and the valve body to enhance the sealing performance. The V-shaped side of the first V-shaped sealing ring faces the direction opposite to the water leakage direction, and a first guide groove is provided on the valve cap at the position where the V-shaped side of the first V-shaped sealing ring faces to guide water to flow into the V-shaped groove of the V-shaped sealing ring to avoid the V-shaped side from closing inwards under the action of water and affecting the sealing effect; a second sealing structure is provided between the valve stem and the valve body; and a third sealing structure is provided between the valve core and the valve body and the valve cap, respectively.

2. A stainless steel ball valve that is self-sealed by water pressure according to claim 1, characterized in that: The second sealing structure includes a second mounting groove opened at the lower end of the valve stem, and at least one second V-shaped sealing ring is sleeved in the second mounting groove for deforming to both sides under the action of water pressure to press against the valve plate and the valve body to enhance the sealing performance. The V-shaped side of the second V-shaped sealing ring faces the lower end of the valve stem, and a second guide groove is opened on the lower groove wall of the first mounting groove for guiding water to flow into the V-shaped groove of the V-shaped sealing ring to avoid the V-shaped side from contracting inward under the action of water and affecting the sealing effect.

3. A stainless steel ball valve that is self-sealed by water pressure according to claim 1 or 2, characterized in that: The third sealing structure includes a first polytetrafluoroethylene gasket, a second polytetrafluoroethylene gasket, and an elastic gasket. The inner end face of the elastic gasket is bonded to the first polytetrafluoroethylene gasket, and the outer end face is bonded to the second polytetrafluoroethylene gasket to form a combined sealing ring that adapts to the rotational deformation of the valve core to achieve a combination of soft and hard seals to improve the sealing performance. The inner wall of the valve body and the inner wall of the valve cap are respectively provided with a third installation groove for fixedly installing the combined sealing ring.

4. A stainless steel ball valve that is self-sealed by water pressure according to claim 3, characterized in that: The elastic gasket and the second polytetrafluoroethylene gasket are respectively provided with a first through hole and a second through hole in the middle thereof; a limiting column is integrally provided on the outer end surface of the first polytetrafluoroethylene gasket, which can extend into the first through hole and the second through hole and abut against the wall of the third mounting groove to limit the maximum compression of the elastic gasket and ensure the sealing effect; the vertical distance between the limiting column and the groove wall of the third mounting groove is the maximum deformation amount of the flexible deformation of the combined sealing ring.

5. A stainless steel ball valve that is self-sealed by water pressure according to claim 4, characterized in that: The outer diameter of the elastic gasket is smaller than the outer diameters of the first polytetrafluoro gasket and the second polytetrafluoro gasket to form a deformation gap for the elastic gasket to deform outward.

6. A stainless steel ball valve that is self-sealed by water pressure according to claim 1 or 2, characterized in that: The actuator is a manual drive element or an electric drive element.

7. A stainless steel ball valve that is self-sealed by water pressure according to claim 1 or 2, characterized in that: The valve body, valve cap and valve core are all made of food-grade stainless steel.

Images