Bidirectional sealing eccentric half ball valve

Abstract

The invention relates to the technical field of valves, in particular to a bidirectional sealing eccentric semi-ball valve. Comprising a valve body and an eccentric hemisphere, the valve body is in eccentric design, an upper valve shaft and a lower valve shaft are arranged on the valve body, an eccentric hemisphere is installed on the upper valve shaft and the lower valve shaft, a cylindrical stepped shaft in the horizontal direction is integrally arranged at the spherical top end of the eccentric hemisphere, a movable valve clack is sleeved on the stepped shaft, a circular two-step clamping groove is formed in an inner cavity on the right side of the valve body, and a valve seat is installed in the small-step clamping groove. An annular pressing plate is fixed to the end face of the left side of the valve seat, and an annular sealing ring with the trapezoidal section is clamped between the annular pressing plate and the valve seat. A rectangular ring groove is formed in the annular wall of the small clamping groove in the right side of the valve body, a hexagon socket set screw with a cylindrical end is arranged at the position of the valve seat, a hexagon socket set screw B with a flat end is arranged on the end face of the right side of the valve body, and a plurality of hexagon socket set screws A with flat end and a plurality of hexagon socket set screws B with flat end are arranged on the end face of the left side of the pressing plate and used for adjusting the position of the valve seat. And the medium can enable the valve seat to move leftwards so as to keep better sealing.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a bidirectional sealing eccentric hemispherical valve. Background Art

[0002] The eccentric hemispherical valve on the market is relatively simple in structure and easy to operate. The basic principle is to use the rotation of the hemisphere in the body cavity and the change in the flow area to control the outlet flow of the water pump, thereby maintaining the flow within the set range. The main defect of the one-way sealing technology of the one-way eccentric hemispherical valve on the market is insufficient sealing performance. Due to its design, the eccentric hemispherical valve may not provide effective sealing when installed in reverse. This is because the sealing structure of the valve is usually optimized for forward installation, and when installed in reverse, the sealing surface may not be properly aligned, resulting in poor sealing effect. For example, in a circulating water system, the fluid in the pipeline may flow in both directions, and the valve may not be able to effectively seal the medium.

[0003] In many industrial production processes, the flow direction of the fluid may need to be changed according to different production stages or operation requirements. For example, in the reaction process of some chemical production, the reaction materials need to flow back and forth in the pipeline at different reaction stages to achieve full mixing, reaction or separation. During the use of the one-way sealed eccentric hemispheric valve, if the medium flows in the reverse direction, it may cause the valve to be poorly sealed and leak. The valve needs to be frequently repaired or replaced, which increases maintenance costs and workload.

[0004] The present invention provides a floating valve seat, which realizes a bidirectional sealing effect of the valve according to the flow direction of the medium through the bidirectional floating of the valve seat. Summary of the invention

[0005] The main purpose of the present invention is to provide a bidirectional sealing eccentric hemispherical valve so as to effectively solve the problems raised in the background technology.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a bidirectional sealed eccentric hemispherical valve, comprising a valve body and an eccentric hemispherical valve; the valve body is eccentrically designed, a valve cover is arranged at the upper end, an upper valve shaft is arranged on the valve cover, the upper valve shaft is sealed with the valve cover by an O-ring C, the valve cover is connected and fixed with the valve body by an internal threaded cylindrical pin B, an O-ring E is arranged between the two, a lower valve shaft is arranged at the lower end of the valve body, the lower valve shaft is sealed with the valve body by an O-ring B, the lower end of the lower valve shaft is sealed and fixed by a blind cover, an eccentric hemispherical valve is installed on the upper valve shaft and the lower valve shaft, the eccentric hemispherical valve is connected and fixed with the upper valve shaft by a flat key, a lower shaft sleeve is arranged between the eccentric hemispherical valve and the lower valve shaft, and a hemispherical gasket is sleeved on the lower valve shaft between the lower end of the eccentric hemispherical valve and the valve body;

[0007] The top of the eccentric hemisphere is integrally provided with a horizontal cylindrical secondary stepped shaft, on which a movable valve disc is mounted, an O-ring D is arranged between the movable valve disc and the eccentric hemisphere, and the movable valve disc is fixedly connected to the eccentric hemisphere by a hexagon socket cylindrical head screw B;

[0008] The valve body is provided with channels for liquid circulation on the left and right sides. A circular secondary stepped groove is provided in the inner cavity on the right side of the valve body. A valve seat is installed in the small stepped groove. The valve seat and the side wall of the valve body are sealed with an O-ring A.

[0009] Preferably, an annular pressure plate is fixed on the left end surface of the valve seat by using a number of evenly distributed hexagon socket head screws A, and an annular sealing ring is clamped between the annular pressure plate and the valve seat.

[0010] Preferably, the cross-section of the annular sealing ring is trapezoidal, and the top of the step contacts and seals with the movable valve disc installed on the eccentric hemisphere when the valve is closed.

[0011] Preferably, the annular pressure plate is located in a large groove in the secondary stepped groove on the right side of the valve body, and a gap is left between the annular pressure plate and the valve body.

[0012] Preferably, a rectangular annular groove is provided on the annular wall of the small groove in the secondary stepped groove on the right side of the valve body, and the valve seat is provided with a plurality of evenly distributed radial bolt holes at the position of the rectangular annular groove, and two hexagonal cylindrical end set screws are installed in the bolt holes.

[0013] Preferably, the front end of the first hexagon socket cylindrical end set screw is located in the rectangular ring groove of the valve body, and the front end diameter of the hexagon socket cylindrical end set screw is smaller than the width of the rectangular ring groove of the valve body.

[0014] Preferably, a plurality of evenly distributed bolt through holes are provided on the right end surface of the valve body, and two hexagon socket flat-end set screws B are installed in each bolt through hole for adjusting the position of the valve seat.

[0015] Preferably, a plurality of hexagon socket flat-end set screws A are evenly distributed on the left end surface of the pressure plate to adjust the position of the valve seat.

[0016] Preferably, a plurality of internally threaded cylindrical pins A are provided between the movable valve flap and the eccentric hemisphere for precise positioning of the movable valve flap.

[0017] When in use, the valve seat can be adjusted to a suitable position by adjusting the hexagon socket flat-end set screw A and the hexagon socket flat-end set screw B, so that after the valve is closed, when the valve is subjected to pressure on the left and right sides, the sealing ring and the movable valve disc can maintain a sealed state.

[0018] Initial state: When the valve is opened, the upper valve shaft drives the eccentric hemisphere to rotate. Due to the eccentric design of the valve body and the eccentric hemisphere, the valve can realize rapid opening and closing of the hemisphere sealing surface.

[0019] After the valve is closed, when the medium flows to the right, the liquid pushes the eccentric hemisphere to deform and displace toward the valve seat, driving the movable valve disc to further press the sealing ring. The greater the pressure, the tighter the seal. When the medium flows to the left, the medium pushes the valve seat to move toward the eccentric hemisphere until the sealing surface is completely fitted to achieve complete closure, which can effectively realize the valve back pressure. During the whole process, the valve seat realizes bidirectional movement according to the size of the reverse force to achieve effective sealing with the hemisphere.

[0020] Beneficial effects of the present invention:

[0021] 1. Excellent double seal structure

[0022] The present invention fundamentally changes the sealing characteristics of the valve through the unique floating valve seat design. It effectively realizes bidirectional sealing when the flow direction of the medium in the pipeline changes, so as to ensure that the medium can be effectively cut off in any flow direction, prevent leakage and reduce maintenance and valve use costs.

[0023] 2. Good versatility and maintenance convenience

[0024] The top screw on the right side of the valve body can be used to adjust the valve seat position from the outside. This design allows the valve to be used many times and the sealing surface rubber gasket is worn out. It only needs to adjust the top screw on the right side to tighten the valve seat to meet the slight wear requirement of the sealing gasket. It greatly shortens the maintenance time, reduces the maintenance cost, improves the operating reliability and availability of the system, and enables the valve of the present invention to be widely used in various industrial and civil water supply and drainage and fluid control fields, with strong versatility and adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Attached Figure 1 It is a cross-sectional view of the structure of the present invention.

[0026] Attached Figure 2 For attachment Figure 1 Enlarged view of part I.

[0027] Attached Figure 3 For the attachment Figure 1 Enlarged view of Part II.

[0028] Attached Figure 1—3, valve body 1, valve seat 2, O-ring A3, movable valve disc 4, blind cover 5, O-ring B6, hemispherical gasket 7, lower valve shaft 8, lower shaft sleeve 9, upper valve shaft 10, flat key 11, valve cover 12, O-ring C13, hexagon socket cylindrical head screw A14, pressure plate 15, sealing ring 16, internal thread cylindrical pin A17, eccentric hemisphere 18, hexagon socket flat end set screw A19, hexagon socket cylindrical head screw B20, O-ring D21, hexagon socket cylindrical end set screw 22, hexagon socket flat end set screw B23, O-ring E24, internal thread cylindrical pin B25, rectangular ring groove 26. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] Attached Figure 1 As shown in FIG. 3 , a bidirectional sealed eccentric hemispherical valve comprises a valve body 1 and an eccentric hemispherical ball 18; the valve body 1 is eccentrically designed, and a valve cover 12 is arranged at the upper end, an upper valve shaft 10 is arranged on the valve cover 12, the upper valve shaft 10 is sealed with the valve cover 12 by an O-ring C13, the valve cover 12 is connected and fixed with the valve body 1 by an internal threaded cylindrical pin B25, an O-ring E24 is arranged between the two, a lower valve shaft 8 is arranged at the lower end of the valve body 1, the lower valve shaft 8 is sealed with the valve body 1 by an O-ring B6, the lower end of the lower valve shaft 8 is sealed and fixed by a cover 5, an eccentric hemispherical ball 18 is installed on the upper valve shaft 10 and the lower valve shaft 8, the eccentric hemispherical ball 18 and the upper valve shaft 10 are connected and fixed by a flat key 11, a lower shaft sleeve 9 is arranged between the eccentric hemispherical ball 18 and the lower valve shaft 8, and a hemispherical gasket 7 is sleeved on the lower valve shaft 8 between the lower end of the eccentric hemispherical ball 18 and the valve body 1;

[0031] The top of the eccentric hemisphere 18 is integrally provided with a horizontal cylindrical secondary stepped shaft, on which a movable valve disc 4 is mounted, an O-ring D21 is provided between the movable valve disc 4 and the eccentric hemisphere 18, and the movable valve disc 4 is fixedly connected to the eccentric hemisphere 18 by a hexagon socket head screw B20;

[0032] The valve body 1 is provided with channels for liquid circulation on the left and right sides. The inner cavity on the right side of the valve body 1 is provided with a circular secondary stepped groove, wherein a valve seat 2 is installed in the small stepped groove, and the valve seat 2 and the side wall of the valve body 1 are sealed with an O-ring A3.

[0033] An annular pressing plate 15 is fixed on the left end surface of the valve seat 2 by a plurality of evenly distributed hexagon socket head screws A14, and an annular sealing ring 16 is clamped between the annular pressing plate 15 and the valve seat 2.

[0034] The cross section of the annular sealing ring 16 is a trapezoid, and the top of the step contacts and seals with the movable valve flap 4 installed on the eccentric hemisphere 18 when the valve is closed.

[0035] The annular pressure plate 15 is located in the large groove of the secondary stepped groove on the right side of the valve body 1 , and a gap is left between the annular pressure plate 15 and the valve body 1 .

[0036] A rectangular annular groove 26 is provided on the annular wall of the small groove in the secondary stepped groove on the right side of the valve body 1, and the valve seat 2 is provided with a plurality of evenly distributed radial bolt holes at the position of the rectangular annular groove 26, and two hexagon socket cylindrical end set screws 22 are installed in the bolt holes.

[0037] The front end of the first hexagon socket cylindrical end set screw 22 is located in the rectangular ring groove 26 of the valve body 1 , and the front end diameter of the hexagon socket cylindrical end set screw 22 is smaller than the width of the rectangular ring groove 26 of the valve body 1 .

[0038] The right side end surface of the valve body 1 is provided with a plurality of evenly distributed bolt through holes, and each bolt through hole is installed with two hexagon socket flat-end set screws B23 for adjusting the position of the valve seat 2.

[0039] A plurality of hexagon socket flat-end set screws A19 are evenly distributed on the left end surface of the pressure plate 15 for adjusting the position of the valve seat 2 .

[0040] A plurality of internally threaded cylindrical pins A17 are provided between the movable valve flap 4 and the eccentric hemisphere 18 for accurate positioning of the movable valve flap 4 .

[0041] When in use, the valve seat 2 can be adjusted to a suitable position by adjusting the hexagon socket flat-end set screw A19 and the hexagon socket flat-end set screw B23, so that after the valve is closed, when the valve is subjected to pressure on the left and right sides, the sealing ring 16 and the movable valve disc 4 can maintain a sealed state.

[0042] Initial state: When the valve is opened, the upper valve shaft 10 drives the eccentric hemisphere 18 to rotate. Because the valve body 1 and the eccentric hemisphere 18 are eccentrically designed, the valve can realize rapid opening and closing of the hemisphere sealing surface;

[0043] After the valve is closed, when the medium flows to the right, the liquid pushes the eccentric hemisphere 18 to deform and displace toward the valve seat 2, driving the movable valve disc 4 to further press the sealing ring 16. The greater the pressure, the tighter the seal. When the medium flows to the left, the medium pushes the valve seat 2 to move toward the eccentric hemisphere 18 until the sealing surface is completely fitted to achieve complete closure, which can effectively realize the valve back pressure. During the whole process, the valve seat 2 realizes bidirectional movement according to the size of the reverse force to achieve effective sealing with the hemisphere.

[0044] Beneficial effects: The present invention can effectively achieve bidirectional sealing when the flow direction of the medium in the pipeline changes, so as to ensure that the medium can be effectively cut off in any flow direction, prevent leakage and reduce maintenance and valve use costs.

[0045] After the valve is used many times and the sealing surface rubber gasket is worn out, you only need to adjust the right top screw to tighten the valve seat to meet the slight wear requirements of the sealing gasket, which greatly shortens the maintenance time and reduces the maintenance cost.

[0046] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bidirectional sealing eccentric hemispherical valve, characterized in that: It includes a valve body and an eccentric hemisphere; the valve body is eccentrically designed, with a valve cover at the upper end, an upper valve shaft on the valve cover, the upper valve shaft is sealed with the valve cover by an O-ring C, the valve cover is connected and fixed with the valve body by an internal threaded cylindrical pin B, an O-ring E is arranged between the two, a lower valve shaft is arranged at the lower end of the valve body, the lower valve shaft is sealed with the valve body by an O-ring B, the lower end of the lower valve shaft is sealed and fixed by a blind cover, an eccentric hemisphere is installed on the upper valve shaft and the lower valve shaft, the eccentric hemisphere and the upper valve shaft are connected and fixed by a flat key, a lower shaft sleeve is arranged between the eccentric hemisphere and the lower valve shaft, and a hemisphere gasket is sleeved on the lower valve shaft between the lower end of the eccentric hemisphere and the valve body; The top of the eccentric hemisphere is integrally provided with a horizontal cylindrical secondary stepped shaft, on which a movable valve disc is mounted, an O-ring D is arranged between the movable valve disc and the eccentric hemisphere, and the movable valve disc is fixedly connected to the eccentric hemisphere by a hexagon socket cylindrical head screw B; The valve body is provided with channels for liquid circulation on the left and right sides. A circular secondary stepped groove is provided in the inner cavity on the right side of the valve body. A valve seat is installed in the small stepped groove. The valve seat and the side wall of the valve body are sealed with an O-ring A.

2. A bidirectional sealing eccentric hemispherical valve according to claim 1, characterized in that: An annular pressing plate is fixed on the left end surface of the valve seat by a plurality of evenly distributed hexagon socket head screws A, and an annular sealing ring is clamped between the annular pressing plate and the valve seat.

3. A bidirectional sealing eccentric hemispherical valve according to claim 2, characterized in that: The cross section of the annular sealing ring is a trapezoid, and the top of the step contacts and seals with the movable valve disc installed on the eccentric hemisphere when the valve is closed.

4. A bidirectional sealing eccentric hemispherical valve according to claim 2, characterized in that: The annular pressure plate is located in a large groove in the secondary stepped groove on the right side of the valve body, and a gap is left between the annular pressure plate and the valve body.

5. A bidirectional sealing eccentric hemispherical valve according to claim 1, characterized in that: A plurality of evenly distributed bolt through holes are arranged on the right end surface of the valve body, and two hexagon socket flat-end set screws B are installed in each bolt through hole for adjusting the position of the valve seat.

6. A bidirectional sealing eccentric hemispherical valve according to claim 1, characterized in that: A rectangular annular groove is arranged on the annular wall of the small groove in the secondary stepped groove on the right side of the valve body, and a valve seat is provided with a plurality of evenly distributed radial bolt holes at the position of the rectangular annular groove, and two hexagonal cylindrical end set screws are installed in the bolt holes.

7. A bidirectional sealing eccentric hemispherical valve according to claim 6, characterized in that: The front end of the first hexagon socket cylindrical end set screw is located in the rectangular ring groove of the valve body, and the front end diameter of the hexagon socket cylindrical end set screw is smaller than the width of the rectangular ring groove of the valve body.

8. A bidirectional sealing eccentric hemispherical valve according to claim 2, characterized in that: A plurality of hexagon socket flat-end set screws A are evenly arranged on the left end surface of the pressure plate to adjust the position of the valve seat.

9. A bidirectional sealing eccentric hemispherical valve according to claim 1, characterized in that: A plurality of internally threaded cylindrical pins A are arranged between the movable valve disc and the eccentric hemisphere for accurate positioning of the movable valve disc.

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