Double spherical semi-spherical valve

Abstract

The utility model discloses a kind of double spherical surface half ball valves, it includes valve body, valve cover, half spherical valve ball, valve rod, valve seat, inverted sealing bearing and sealing system, half spherical valve ball is rotatably located inside valve body, valve seat is connected in valve body, valve seat has the spherical surface structure of outward bulge, spherical surface structure and half spherical valve ball mutually adhere to abut and line contact seal, valve cover is connected in the top of valve body, valve rod is rotatably connected in valve cover, and valve rod is connected in the top of half spherical valve ball, inverted sealing bearing is sleeved in valve rod and located in the bottom of the valve cover, sealing system is located above inverted sealing bearing, and sealing system is pressed between the outer surface of valve rod and valve cover. Spherical surface structure and half spherical valve ball adhere to abut and line contact seal, realize better sealing effect, not easy to damage sealing surface. A supplementary sealing is formed by inverted sealing bearing, and guide and support are provided when valve rod is lifted, realize smooth operation, greatly improve safety stability.

Description

Technical Field

[0001] This utility model relates to the field of fluid control equipment technology, and in particular to a double-spherical hemispherical valve. Background Technology

[0002] Ball valves, as a crucial pipeline shut-off device, are widely used in industries such as petroleum, chemical, and power. Traditional ball valves, when used under high pressure, high frequency, or conditions containing particulate impurities, commonly suffer from problems such as easy seat wear, rapid seal failure, high opening and closing torque, and easy stem jamming. Although existing technologies offer various improvements, such as using hard seals and reinforced stuffing boxes, shortcomings remain in the long-term stability of the sealing pair, stem support and sealing, and optimization of fluid flow direction. Therefore, there is an urgent need for a ball valve structure that offers more reliable sealing, easier operation, and a longer service life. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned shortcomings of the existing technology, and this utility model provides a double spherical hemispherical valve.

[0004] This utility model is achieved through the following technical solution:

[0005] A double-spherical hemispherical valve includes a valve body, a valve cover, a hemispherical valve ball, a valve stem, a valve seat, a reverse sealing bearing, and a sealing system. The valve body forms a fluid channel inside. The hemispherical valve ball is rotatably located inside the valve body. The valve seat is connected to the valve body. One end face of the valve seat facing the hemispherical valve ball has an outwardly convex spherical structure. The spherical structure and the hemispherical valve ball are in close contact and sealed. The valve cover is connected to the top of the valve body. The valve stem is rotatably connected inside the valve cover and connected to the top of the hemispherical valve ball. The reverse sealing bearing is sleeved on the valve stem and located inside the bottom of the valve cover. The sealing system is located above the reverse sealing bearing and is pressed between the outer surface of the valve stem and the valve cover.

[0006] Furthermore, the outer peripheral surface of the valve stem has an outwardly protruding stepped portion, the bottom of which abuts against the hemispherical valve ball, and the inverted sealing bearing is disposed between the top of the stepped portion and the bottom of the valve cover.

[0007] Furthermore, the bottom of the valve cover has an upwardly recessed receiving groove, into which the inverted sealing bearing and the stepped portion extend.

[0008] Furthermore, the bottom of the valve cover has a first mounting groove, the receiving groove is located above the first mounting groove, the top of the hemispherical valve ball extends into the first mounting groove, and the double-spherical hemispherical valve also includes a first bearing, the first bearing is located in the first mounting groove, and the first bearing is sleeved on the top of the hemispherical valve ball.

[0009] Furthermore, the valve body has a second mounting groove, the bottom of the hemispherical valve ball extends into the second mounting groove, and the double-spherical hemispherical valve also includes a second bearing, the second bearing is located in the second mounting groove, and the second bearing is sleeved on the bottom of the hemispherical valve ball.

[0010] Furthermore, a gasket is pressed between the bottom of the hemispherical valve ball and the bottom of the second mounting groove.

[0011] Furthermore, the sealing system includes a valve stem packing and a packing gland, wherein the valve stem packing is pressed between the outer surface of the valve stem and the valve cover, the packing gland is connected to the top of the valve cover, and the bottom of the packing gland is pressed against the top of the valve stem packing.

[0012] Furthermore, the valve seat has multiple connection holes, all of which extend through the valve seat along its axial direction and are connected to the valve body by fasteners.

[0013] Furthermore, a first sealing element is pressed between the end of the valve seat away from the hemispherical valve ball and the valve body.

[0014] Furthermore, a second seal is pressed between the top of the valve body and the valve cover.

[0015] The beneficial effects of this utility model are as follows:

[0016] This utility model discloses a double-spherical hemispherical valve. The valve seat, through its outwardly convex spherical structure, fits and contacts the outer surface of the hemispherical valve ball, achieving a superior sealing effect and better adaptability to small particles in the medium, reducing the risk of damage to the sealing surface. Simultaneously, the sealing system is pressed between the outer surface of the valve stem and the valve cover, providing a seal. An auxiliary seal is formed in the fully open position of the double-spherical hemispherical valve via a reverse sealing bearing, which also provides guidance and support during valve stem movement, ensuring smooth operation and significantly improving the safety and stability of the double-spherical hemispherical valve. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the internal structure of the double-spherical hemispherical valve according to an embodiment of the present invention.

[0018] Figure 2 for Figure 1A magnified view of part A in the diagram.

[0019] Explanation of reference numerals in the attached figures:

[0020] Valve body 1

[0021] Valve cover 2

[0022] Receiving slot 21

[0023] Second seal 22

[0024] hemispherical valve ball 3

[0025] Valve stem 4

[0026] Step 41

[0027] Valve seat 5

[0028] spherical structure 51

[0029] First sealing element 52

[0030] Reverse seal bearing 6

[0031] Sealing System 7

[0032] Valve stem packing 71

[0033] Packing gland 72

[0034] First bearing 8

[0035] Second bearing 9

[0036] Gasket 10 Detailed Implementation

[0037] The following description of the embodiments is with reference to the accompanying drawings, which illustrate specific embodiments in which the present invention can be implemented.

[0038] like Figure 1 and Figure 2As shown, this embodiment discloses a double-spherical hemispherical valve, which includes a valve body 1, a valve cover 2, a hemispherical valve ball 3, a valve stem 4, a valve seat 5, a reverse sealing bearing 6, and a sealing system 7. A fluid channel is formed inside the valve body 1, the hemispherical valve ball 3 is rotatably located inside the valve body 1, the valve seat 5 is connected inside the valve body 1, and the end face of the valve seat 5 facing the hemispherical valve ball 3 has an outwardly raised spherical structure 51. The spherical structure 51 and the hemispherical valve ball 3 are in close contact and sealing with each other. The hemispherical valve ball 3 has a hemispherical structure. The spherical surface of the hemispherical valve ball 3 cooperates with a valve seat 5, which also has a spherical structure 51, to form a main sealing pair. The valve seat 5 fits against and makes line contact with the outer surface of the hemispherical valve ball 3 through the outwardly raised spherical structure 51. The spherical structure 51 and the outer surface of the hemispherical valve ball 3 adopt this spherical-to-spherical line contact seal, which has more uniform contact stress than the traditional planar seal, achieves better sealing effect, and has better adaptability to small particles in the medium. It is not easy to damage the sealing surface and has a long service life.

[0039] The valve cover 2 is connected to the top of the valve body 1. The valve stem 4 is rotatably connected inside the valve cover 2 and connected to the top of the hemispherical valve ball 3. The inverted sealing bearing 6 is sleeved on the valve stem 4 and located inside the bottom of the valve cover 2. The sealing system 7 is located above the inverted sealing bearing 6 and is pressed between the outer surface of the valve stem 4 and the valve cover 2. The rotation of the valve stem 4 will cause the hemispherical valve ball 3 to rotate within the valve body 1. The sealing system 7 plays a sealing role. By pressing between the outer surface of the valve stem 4 and the valve cover 2, the sealing system 7 effectively enhances the sealing effect between the valve stem 4 and the valve cover 2. The inverted sealing bearing 6 is located below the sealing system 7 and sleeved on the valve stem 4. The inverted sealing bearing 6 can form an auxiliary seal in the fully open position of the double-spherical hemispherical valve, ensuring that the valve stem 4 will not be blown out of the valve cover 2 by the medium pressure, effectively preventing catastrophic accidents. Meanwhile, the reverse sealing bearing 6 provides stable support for the valve stem 4 and provides guidance and support when the valve stem 4 rises and falls, effectively reducing the swaying caused by vibration, achieving smooth operation, and greatly improving the safety and stability of the double spherical hemispherical valve.

[0040] In this embodiment, the outer peripheral surface of the valve stem 4 has an outwardly protruding stepped portion 41. The bottom of the stepped portion 41 abuts against the hemispherical valve ball 3, and the inverted sealing bearing 6 is disposed between the top of the stepped portion 41 and the bottom of the valve cover 2. The stepped portion 41 provides support and abutment for the inverted sealing bearing 6, making installation convenient.

[0041] The bottom of the valve cover 2 has an upwardly recessed receiving groove 21, into which the inverted sealing bearing 6 and the stepped portion 41 extend. By placing both the inverted sealing bearing 6 and the stepped portion 41 within the receiving groove 21, installation is convenient and stability is high. Simultaneously, the inverted sealing bearing 6 and the stepped portion 41 abut against the bottom of the receiving groove 21, ensuring that the valve stem 4 will not be blown out of the valve cover 2 by the medium pressure, effectively preventing catastrophic accidents and greatly improving the safety and stability of the double-spherical hemispherical valve.

[0042] The valve cover 2 has a first mounting groove at its bottom, and a receiving groove 21 is located above the first mounting groove. The top of the hemispherical valve ball 3 extends into the first mounting groove. The double-spherical hemispherical valve also includes a first bearing 8, which is located in the first mounting groove and is sleeved on the top of the hemispherical valve ball 3. The top of the hemispherical valve ball 3 extends into the first mounting groove and rotates within it. The first bearing 8 provides circumferential stable support for the top of the hemispherical valve ball 3, greatly reducing the swaying caused by vibration and making the rotation operation of the top of the hemispherical valve ball 3 smooth.

[0043] The valve body 1 has a second mounting groove, into which the bottom of the hemispherical valve ball 3 extends. The double-spherical hemispherical valve also includes a second bearing 9, which is located within the second mounting groove and fitted onto the bottom of the hemispherical valve ball 3. The bottom of the hemispherical valve ball 3 extends into the second mounting groove and rotates within it. The second bearing 9 provides circumferential stable support for the bottom of the hemispherical valve ball 3, greatly reducing the swaying caused by vibration and ensuring smooth rotation of the bottom of the hemispherical valve ball 3. The inverted sealing bearing 6, the first bearing 8, and the second bearing 9 support the rotation of the valve stem 4 and the hemispherical valve ball 3, significantly reducing the rotational frictional resistance of the valve stem 4 and the hemispherical valve ball 3. Multiple bearing supports and a low-torque design make opening and closing operations very easy.

[0044] A gasket 10 is pressed between the bottom of the hemispherical valve ball 3 and the bottom of the second mounting groove. By placing the gasket 10 between the bottom of the hemispherical valve ball 3 and the valve body 1, frictional contact between the bottom of the hemispherical valve ball 3 and the valve body 1 is effectively avoided, thus ensuring smooth rotation of the hemispherical valve ball 3.

[0045] The sealing system 7 includes a stem packing 71 and a packing gland 72. The stem packing 71 is pressed between the outer surface of the valve stem 4 and the valve cover 2. The packing gland 72 is connected to the top of the valve cover 2, and its bottom is pressed against the top of the stem packing 71. The stem packing 71 provides a seal, effectively preventing external leakage of the double-spherical hemispherical valve when conveying media. Simultaneously, the packing gland 72 is connected to the top of the valve cover 2 and presses against the stem packing 71. By tightening the stem packing 71 with the packing gland 72, the sealing effect is further enhanced, ensuring the dynamic sealing reliability at the valve stem 4. The reverse sealing bearing 6 prevents solid media from entering the sealing system 7; the higher the pressure in the cavity, the better the sealing performance. The multiple sealing barriers of the sealing system 7 and the reverse sealing bearing 6 ensure zero leakage from the valve stem 4.

[0046] The valve seat 5 has multiple connection holes, all of which extend through the valve seat 5 along its axial direction and are connected to the valve body 1 by fasteners. The use of multiple fasteners passing through these connection holes and connecting to the valve body 1 ensures a high degree of stability in the connection between the valve seat 5 and the valve body 1.

[0047] A first sealing element 52 is pressed between the end of the valve seat 5 furthest from the hemispherical valve ball 3 and the valve body 1. The first sealing element 52 serves to strengthen the seal, thereby effectively enhancing the sealing effect between the first sealing element 52 and the valve body 1 and further preventing leakage. The first sealing element 52 is a gasket.

[0048] A second sealing element 22 is pressed between the top of the valve body 1 and the valve cover 2. The second sealing element 22 strengthens the seal, effectively enhancing the sealing effect between the valve body 1 and the valve cover 2, and further preventing leakage. The second sealing element 22 is a sealing gasket. The valve cover 2 is connected to the valve body 1 by multiple bolts to form a pressure-bearing cavity. The valve cover 2 is detachably connected to the top of the valve body 1. Key components such as bearings, seals, and valve seats 5 adopt a modular design, allowing for replacement and maintenance without disassembling the valve body 1, only requiring the removal of the valve cover 2, significantly reducing maintenance costs and downtime.

[0049] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A double-spherical hemispherical valve, characterized in that, It includes a valve body, a valve cover, a hemispherical valve ball, a valve stem, a valve seat, a reverse sealing bearing, and a sealing system. The valve body forms a fluid channel inside. The hemispherical valve ball is rotatably located inside the valve body. The valve seat is connected to the valve body. The end face of the valve seat facing the hemispherical valve ball has an outwardly raised spherical structure. The spherical structure and the hemispherical valve ball are in close contact and sealed. The valve cover is connected to the top of the valve body. The valve stem is rotatably connected inside the valve cover and connected to the top of the hemispherical valve ball. The reverse sealing bearing is sleeved on the valve stem and located inside the bottom of the valve cover. The sealing system is located above the reverse sealing bearing and is pressed between the outer surface of the valve stem and the valve cover.

2. The double-spherical hemispherical valve as described in claim 1, characterized in that, The outer circumferential surface of the valve stem has an outwardly protruding stepped portion, the bottom of which abuts against the hemispherical valve ball, and the inverted sealing bearing is disposed between the top of the stepped portion and the bottom of the valve cover.

3. The double-spherical hemispherical valve as described in claim 2, characterized in that, The bottom of the valve cover has an upwardly recessed receiving groove, into which the inverted sealing bearing and the stepped portion extend.

4. The double-spherical hemispherical valve as described in claim 3, characterized in that, The bottom of the valve cover has a first mounting groove, the receiving groove is located above the first mounting groove, the top of the hemispherical valve ball extends into the first mounting groove, the double spherical hemispherical valve also includes a first bearing, the first bearing is located in the first mounting groove, and the first bearing is sleeved on the top of the hemispherical valve ball.

5. The double-spherical hemispherical valve as described in claim 1, characterized in that, The valve body has a second mounting groove, and the bottom of the hemispherical valve ball extends into the second mounting groove. The double-spherical hemispherical valve also includes a second bearing, which is located in the second mounting groove and is sleeved on the bottom of the hemispherical valve ball.

6. The double-spherical hemispherical valve as described in claim 5, characterized in that, A gasket is pressed between the bottom of the hemispherical valve ball and the bottom of the second mounting groove.

7. The double-spherical hemispherical valve as described in claim 1, characterized in that, The sealing system includes a valve stem packing and a packing gland. The valve stem packing is pressed between the outer surface of the valve stem and the valve cover. The packing gland is connected to the top of the valve cover, and the bottom of the packing gland is pressed against the top of the valve stem packing.

8. The double-spherical hemispherical valve as described in claim 1, characterized in that, The valve seat has multiple connection holes, all of which extend through the valve seat along its axial direction and are connected to the valve body by fasteners.

9. The double-spherical hemispherical valve as described in claim 1, characterized in that, A first sealing element is pressed between the end of the valve seat away from the hemispherical valve ball and the valve body.

10. The double-spherical hemispherical valve as described in claim 1, characterized in that, A second sealing element is pressed between the top of the valve body and the valve cover.

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