CN115264087A - A triple eccentric butterfly valve that can be sealed in both directions - Google Patents

Abstract

The invention belongs to the technical field of triple eccentric butterfly valves, and particularly relates to a triple eccentric butterfly valve capable of being sealed in a two-way mode. The three-eccentric butterfly valve capable of being sealed in two directions comprises a valve body, wherein a valve shaft and a butterfly plate are arranged in the valve body, the valve shaft is eccentrically arranged on the bottom surface of the butterfly plate, the butterfly plate is divided into a first plate block and a second plate block by the projection of the axis of the valve shaft on the butterfly plate, a sealing assembly comprises a fixed valve seat and a movable valve seat, the area of the first plate block on the side, away from the valve shaft, of the butterfly plate is larger than that of the second plate block, and the area of the end face of the movable valve seat on the side, away from the valve shaft, of the movable valve seat is larger than the difference between the areas of the first plate block and the second plate block on the side, away from the valve shaft, of the butterfly plate. When the butterfly valve is used, the movable valve seat can push the butterfly plate which deflects at a small angle, so that the butterfly plate is reset, and then the butterfly plate keeps sealed with the movable sealing ring on the fixed valve seat and keeps sealed with the inner wall surface of the movable valve seat, so that the liquid leakage is not easy to occur.

Description

A Triple Eccentric Butterfly Valve Capable of Two-way Sealing

technical field

The invention belongs to the technical field of triple-eccentric butterfly valves, in particular to a triple-eccentric butterfly valve capable of bidirectional sealing.

Background technique

Butterfly valve, also known as flap valve, is a regulating valve with simple structure. The opening and closing part of butterfly valve is a disc-shaped butterfly plate, which can be opened, closed or adjusted by rotating the butterfly plate around the corresponding axis in the valve body. purpose of traffic. Butterfly valve not only has simple structure, small size, light weight, low material consumption, small installation size, small driving torque, easy and fast operation, but also has good flow regulation function and closing and sealing characteristics at the same time. One of the fastest valve varieties. Butterfly valves are divided into central sealing butterfly valves, single eccentric sealing butterfly valves, double eccentric sealing butterfly valves and triple eccentric sealing butterfly valves according to their structural forms. For example, Chinese patent CN110081189B discloses a bidirectional triple eccentric butterfly valve.

Among them, there are three eccentric structures in the triple eccentric butterfly valve. The first eccentricity refers to the eccentric dimension between the valve stem axis and the radial sealing surface of the butterfly plate, that is, the axial eccentricity. The second eccentricity refers to the difference between the valve stem axis and the valve stem axis. There is an eccentric dimension between the channel axes of the body, that is, radial eccentricity. The third eccentricity refers to the formation of an oblique cone angle between the valve seat seal and the channel axis of the valve body, that is, angular eccentricity. Due to the existence of angular eccentricity, the butterfly The plate is usually a right-angle oblique conical frustum, and its outer peripheral surface is an oblique frustoconical surface. When the existing triple eccentric butterfly valve is in use, due to factors such as processing errors and assembly errors, when the liquid pressure acts on the butterfly plate, the butterfly plate will inevitably deflect at a small angle, which will cause the oblique conical frustum surface and the seat There is a gap between the inner wall surfaces of the valve seat, and the sealing effect of the valve seat becomes poor.

Contents of the invention

Based on this, it is necessary to address the problems existing in the prior art and provide a triple-eccentric butterfly valve capable of bidirectional sealing, so as to solve the problem of poor sealing effect of the triple-eccentric butterfly valve in the prior art.

Above-mentioned purpose realizes through following technical scheme:

A triple eccentric butterfly valve capable of bidirectional sealing, including:

The valve body is equipped with a valve shaft and a butterfly plate. The valve shaft is eccentrically arranged on the bottom surface of the butterfly plate. The projection of the axis of the valve shaft on the butterfly plate divides the butterfly plate into a first plate and a second plate. The valve shaft The rotation can drive the butterfly plate to rotate to open or close the valve body, and the outer peripheral surface of the butterfly plate is the first oblique frustum of conical surface;

The sealing assembly is used to seal the gap between the butterfly plate and the inner wall of the valve body. The sealing assembly includes a fixed valve seat and a movable valve seat. The inner wall of the fixed valve seat is provided with a The second oblique frustum of conical surface, the inner wall surface of the valve body is provided with an annular sinking groove, the outer peripheral surface of the movable valve seat is in sliding cooperation with the groove bottom guide provided with the annular sinking groove, and the outer peripheral surface of the movable valve seat is fitted with the In cooperation with the groove bottom of the annular sinking groove, the inner wall of the movable valve seat is provided with a third oblique frustum of conical surface adapted to the first oblique frustum of conical surface, and the third oblique frustum of conical surface can Sliding, the area of the first plate on the side of the butterfly plate away from the valve shaft is larger than the area of the second plate, and the area of the end face of the movable valve seat on the side away from the valve shaft is larger than the area of the first plate on the side of the butterfly plate away from the valve shaft. The difference between the area of the first plate and the second plate, the fixed valve seat is provided with a plurality of communication through holes, the communication through holes are used for liquid to enter the gap between the movable valve seat and the fixed valve seat;

The control assembly is used to drive the valve shaft to rotate.

Further, the fixed valve seat includes a fixed valve casing and a movable sealing ring arranged in the fixed valve casing, an annular groove is arranged in the fixed valve casing, the movable sealing ring is arranged in the annular groove, and the diameter of the movable sealing ring is smaller than the diameter of the annular groove , so that the movable sealing ring can move in the annular groove, and the inner wall surface of the movable sealing ring and the inner wall surface of the fixed valve casing are used to form the second oblique frusto-conical surface.

Further, a shaft sleeve is fixed on the end surface of the butterfly plate away from the movable valve seat, and the projection of the shaft sleeve on the butterfly plate divides the butterfly plate into a first plate and a second plate, and the valve shaft is coaxially mounted in the sleeve and Cooperate with the shaft sleeve to stop rotation.

Further, a bracket is fixed on the end surface of the butterfly plate away from the valve seat, and the shaft sleeve is fixed on the bracket.

Further, the sealing assembly also includes a rotation stop structure, which is used to prevent the movable valve seat from rotating in the circumferential direction. Fixed on the movable valve seat, the anti-rotation column is provided with a notch extending along the axial direction of the anti-rotation column, and the gap between the inner wall surface of the notch and the inner wall surface of the communication through hole is for liquid to pass through.

Further, the control assembly includes a handwheel assembly and a transmission assembly, the transmission assembly is connected to the valve shaft in transmission, and the handwheel assembly is used to drive the transmission assembly to act.

Further, the transmission assembly includes a first bevel gear and a second bevel gear meshing with each other, the hand wheel assembly includes a hand wheel and a drive shaft fixedly connected to the hand wheel, the first bevel gear is fixed on the drive shaft, and the second bevel gear is fixed on the valve shaft.

The beneficial effects of the present invention are: when the bidirectionally sealed triple eccentric butterfly valve of the present invention is in use, the valve body is divided into two chambers by the butterfly plate, and when the liquid fills the chamber of the valve body away from the valve shaft, the liquid pressure acts on the On the surface of the butterfly plate, since the area of the first plate on the side of the butterfly plate away from the valve shaft is larger than the area of the second plate, the liquid pressure on the first plate is greater than that on the second plate, and the butterfly plate will A small angle of deflection occurs. During this process, the liquid will enter between the movable valve seat and the fixed valve seat through the communication through hole, so that the movable valve seat will also be subjected to liquid pressure. The difference between the area of the first plate and the second plate on the side of the plate away from the valve shaft, so the liquid pressure on the movable valve seat is greater than the difference between the liquid pressure on the first plate and the liquid pressure on the second plate, and Because the outer peripheral surface of the movable valve seat is slidingly matched with the groove bottom of the annular sinking groove, the movable valve seat will slide axially in the annular sinking groove and stick to the side wall of the annular sinking groove, during which the push occurs The butterfly plate deflected at a small angle makes the butterfly plate reset, and then the butterfly plate keeps sealing with the movable sealing ring on the fixed valve seat and the inner wall of the movable valve seat, so that the liquid leakage is not easy to occur.

Description of drawings

Fig. 1 is the structural representation of the embodiment 1 of the three-eccentric butterfly valve that can be bidirectionally sealed of the present invention;

Fig. 2 is an exploded view of the parts of the triple-eccentric butterfly valve capable of bidirectional sealing in Fig. 1;

Fig. 3 is a partial enlarged view of A place in Fig. 2;

Fig. 4 is the schematic diagram of the partial structure of Fig. 1;

Figure 5 is a top sectional view of Figure 4;

Figure 6 is a front sectional view of Figure 4;

Fig. 7 is a partial enlarged view at B of Fig. 6;

Fig. 8 is a structural schematic diagram of the butterfly plate in Fig. 1;

Fig. 9 is a structural schematic diagram of the first viewing angle of the butterfly plate in Fig. 8;

Fig. 10 is a structural schematic diagram of a second viewing angle of the butterfly plate in Fig. 8;

in:

100. Valve body; 110. Flange; 120. Connecting cylinder; 130. Packing seal; 132. Packing piece; 140. Raised section; 142. Annular sink;

200, valve shaft;

300. Butterfly plate; 310. The first oblique frustum of conical surface; 320. Bracket; 330. Shaft sleeve;

410, fixed valve seat; 412, fixed valve casing; 414, movable sealing ring; 416, contact through hole; 420, movable valve seat; 422, stop column; 424, gap;

510, transmission housing; 520, hand wheel.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail through the following embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The serial numbers assigned to the components in this document, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequence or technical meaning. The "connection" and "connection" mentioned in this application include direct and indirect connection (connection) unless otherwise specified. In describing the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description , rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature indirectly through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

The triple eccentric butterfly valve capable of bidirectional sealing of the present invention will be described below in conjunction with the accompanying drawings and specific implementation methods.

Embodiment 1 of the triple eccentric butterfly valve capable of bidirectional sealing of the present invention:

As shown in Figures 1 to 10, the triple eccentric butterfly valve capable of bidirectional sealing in this embodiment includes a valve body 100, a valve shaft 200, a butterfly plate 300, a sealing assembly and a control assembly, and the sealing assembly includes a fixed valve seat 410 and a movable valve seat 420 , the valve body 100 is cylindrical and has a channel inside, and the sealing assembly and the butterfly plate 300 are both arranged in the channel of the valve body 100 . A flange 110 is disposed on the outer peripheral surface of the valve body 100 , and the flange 110 is provided with a shaft hole penetrating through the wall of the valve body 100 , and the valve shaft 200 penetrates into the valve body 100 through the shaft hole. The connecting cylinder 120 is fixed on the flange 110, the control assembly includes a handwheel 520 assembly and a transmission assembly, the transmission assembly is connected to the valve shaft 200 in transmission, and the handwheel 520 assembly is used to drive the transmission assembly to move. In order to prevent liquid leakage, a packing seal 130 is fixed in the connecting cylinder 120 , the valve shaft 200 passes through the packing seal 130 , and a compressive force is generated between the packing member 132 and the valve shaft 200 to form a dynamic seal.

The transmission assembly includes a transmission housing 510, a first bevel gear and a second bevel gear meshing with each other, the first bevel gear and the second bevel gear are located in the transmission housing 510, and the transmission housing 510 is fixedly connected to the other end of the connecting cylinder 120 , the valve shaft 200 passes through the connecting cylinder 120 and extends into the transmission housing 510. The hand wheel 520 assembly includes the hand wheel 520 and the drive shaft fixedly connected with the hand wheel 520. The first bevel gear is fixed on the drive shaft, and the second bevel gear is fixed on the drive shaft. The gear is fixed on the valve shaft 200 .

The shape of the butterfly plate 300 is a right-angle oblique conical truncated cone. The outer peripheral surface of the butterfly plate 300 is a first oblique frustoconical surface 310. The area of the first end surface of the butterfly plate 300 is larger than the area of the second end surface, and the first end surface faces away from the fixed valve. The seat 410, the bracket 320 is fixed on the first end surface of the butterfly plate 300, the bushing 330 is fixed on the bracket 320, the projection of the axis of the bushing 330 on the butterfly plate 300 is located at the longest busbar and the shortest busbar of the butterfly plate 300 Between, and the butterfly plate 300 is divided into a first plate and a second plate, the axis of the valve shaft 200 and the channel axis of the valve body 100 have an eccentric dimension, so that the second plate on the side of the butterfly plate 300 away from the valve shaft 200 The area of one plate is greater than the area of the second plate. The valve shaft 200 is installed in the shaft sleeve 330 and matched with the valve sleeve for non-rotation. Specifically, the inner wall of the shaft sleeve 330 is provided with a keyway, and the valve shaft 200 is provided with a key adapted to the keyway. Through the key and the keyway, the valve shaft 200 and the valve sleeve realize anti-rotation fit.

The sealing assembly is used to seal the gap between the butterfly plate 300 and the inner wall of the valve body 100. In order to achieve this requirement, the fixed valve seat 410 and the movable valve seat 420 are arranged between the butterfly plate 300 and the inner wall of the valve body 100, specifically , the fixed valve seat 410 is fixed on the inner wall of the valve body 100, the fixed valve seat 410 is ring-shaped, and the inner wall surface of the fixed valve seat 410 is a third oblique frustoconical surface that matches the first oblique frustoconical surface 310. When the liquid flows from When the first end face of the butterfly plate 300 is facing the cavity, the butterfly plate 300 is pushed by the liquid, and the first oblique frustoconical surface 310 of the butterfly plate 300 is attached to the third oblique frustoconical surface of the fixed valve seat 410, so that The seal between the butterfly plate 300 and the sealing assembly is tighter, so as to prevent liquid from leaking into the chamber to which the second end surface of the butterfly plate 300 faces. The fixed valve seat 410 includes a fixed valve casing 412 and a movable sealing ring 414 arranged in the fixed valve casing 412. An annular groove is arranged in the fixed valve casing 412, and the movable sealing ring 414 is arranged in the annular groove. The diameter of the movable sealing ring 414 is less than The diameter of the annular groove enables the movable seal ring 414 to move in the annular groove. When the movable seal ring 414 is attached to the butterfly plate 300, the inner wall surface of the movable seal ring 414 and the inner wall surface of the fixed valve housing 412 participate in forming the second Oblique frustoconical surface.

The outer peripheral surface of the valve body 100 is provided with a raised section 140, the inner wall surface of the valve body 100 is provided with an annular sinking groove 142, the annular sinking groove 142 sinks into the raised section 140, and the outer peripheral surface of the movable valve seat 420 is provided with A cylindrical surface that is guided and slidably matched with the groove bottom of the annular sinker 142 , the cylindrical surface is sealingly matched with the groove bottom of the annular sinker 142 , and the inner wall surface of the movable valve seat 420 is provided with a surface that is adapted to the first oblique frustum of conical surface 310 The third oblique truncated conical surface, wherein the diameter of the movable valve seat 420 is greater than that of the fixed valve seat 410 , and the movable valve seat 420 is located between the valve shaft 200 and the fixed valve seat 410 . When the movable valve seat 420 is pushed by the liquid, the third oblique frustoconical surface slides along the first oblique frustoconical surface. It should be noted that the valve body 100 adopts an assembled structure and is assembled by two barrel sections. During assembly, the movable valve seat 420 is first put into the annular sinker 142, and then the two barrel sections are fixedly connected together. , the movable valve seat 420 will not escape from the annular sinker 142 .

In order to enable the movable valve seat 420 to correct the rotation of the butterfly plate 300 to improve the sealing effect, the area of the end face of the movable valve seat 420 on the side away from the valve shaft 200 is larger than that of the side of the butterfly plate 300 away from the valve shaft 200 The difference between the area of the first plate and the second plate, the fixed valve seat 410 is provided with a plurality of communication through holes 416, the communication through holes 416 are used for liquid to enter the gap between the movable valve seat 420 and the fixed valve seat 410, when When the liquid enters the chamber facing the second end surface of the butterfly plate 300 , the liquid can enter the gap between the movable valve seat 420 and the fixed valve seat 410 through the communication through hole 416 , and push the movable valve seat 420 to move.

In order to prevent the movable valve seat 420 from rotating in the annular sinker 142 in the circumferential direction, the sealing assembly in this embodiment also includes a rotation stop structure. Together with the anti-rotation column 422, the anti-rotation column 422 is fixed on the movable valve seat 420, the notch 424 extending along the axial direction of the anti-rotation column 422 is arranged on the anti-rotation column 422, the inner wall surface of the notch 424 is connected with the through hole 416 The gap between the inner walls allows the passage of liquid.

The usage process of the triple eccentric butterfly valve capable of bidirectional sealing in this embodiment is as follows:

When the liquid is full of the cavity facing the second end surface of the butterfly plate 300, the liquid pressure acts on the plate surface of the butterfly plate 300, because the area of the first plate on the side of the butterfly plate 300 away from the valve shaft 200 is larger than that of the second plate. Therefore, the liquid pressure on the first plate is greater than the liquid pressure on the second plate. Considering factors such as processing errors and assembly errors, the butterfly plate 300 will deflect at a small angle. During this process, the liquid will enter between the movable valve seat 420 and the fixed valve seat 410 through the gap between the notch 424 on the anti-rotation column 422 and the inner wall of the communication through hole 416, so that the movable valve seat 420 will also be subjected to liquid pressure. Since the area of the end surface of the movable valve seat 420 away from the valve shaft 200 is larger than the difference between the area of the first plate and the second plate on the side of the butterfly plate 300 away from the valve shaft 200, the movable valve seat 420 is subjected to The liquid pressure is greater than the difference between the liquid pressure on the first plate and the liquid pressure on the second plate, and because the outer peripheral surface of the movable valve seat 420 is slidably matched with the groove bottom guide of the annular sinker 142, the movable valve seat 420 will be in the ring Slide in the axial direction in the sinking groove 142, and stick to the side wall of the annular sinking groove 142, push the butterfly plate 300 deflected at a small angle in the process, reset the butterfly plate 300, and then the butterfly plate 300 and the fixed The movable sealing ring 414 on the valve seat 410 keeps sealing and keeps sealing with the inner wall surface of the movable valve seat 420, so that the situation of liquid leakage is not easy to occur.

When it is necessary to connect the two chambers, turn the hand wheel 520, the valve shaft 200 rotates, and then the butterfly plate 300 rotates around the valve shaft 200. During the rotation of the butterfly plate 300, when a part of the outer peripheral surface of the butterfly plate 300 is no longer squeezed When the corresponding part of the movable sealing ring 414 is used, another part of the outer peripheral surface of the butterfly plate 300 will push a part of the movable sealing ring 414. Since the movable sealing ring 414 is movable in the annular sinker 142, the other part of the movable sealing ring 414 The ring segment will be exposed from the annular sinking groove 142. When it is necessary to isolate the two chambers, turn the hand wheel 520 in the opposite direction, and the butterfly plate 300 will return and return the movable sealing ring 414 to its original position. The movable sealing ring 414 and butterfly Seals are formed between the plates 300. During this process, the butterfly plate 300 will not rub against the movable sealing ring 414 with a large extrusion force, and the movable sealing ring 414 is not easily damaged. Compared with the traditional three-eccentric butterfly valve Fixed sealing structures such as U-shaped sealing rings, semi-O-shaped sealing rings, and lip-shaped sealing rings, the service life of the movable sealing ring 414 is relatively high. malfunction and seal failure.

The technical features of the above embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be It is considered to be within the range described in this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (7)

1. A triple eccentric butterfly valve capable of bidirectional sealing, characterized in that it comprises: The valve body is equipped with a valve shaft and a butterfly plate. The valve shaft is eccentrically arranged on the bottom surface of the butterfly plate. The projection of the axis of the valve shaft on the butterfly plate divides the butterfly plate into a first plate and a second plate. The valve shaft The rotation can drive the butterfly plate to rotate to open or close the valve body, and the outer peripheral surface of the butterfly plate is the first oblique frustum of conical surface; The sealing assembly is used to seal the gap between the butterfly plate and the inner wall of the valve body. The sealing assembly includes a fixed valve seat and a movable valve seat. The inner wall of the fixed valve seat is provided with a The second oblique frustum of conical surface, the inner wall surface of the valve body is provided with an annular sinking groove, the outer peripheral surface of the movable valve seat is in sliding cooperation with the groove bottom guide provided with the annular sinking groove, and the outer peripheral surface of the movable valve seat is fitted with the In cooperation with the groove bottom of the annular sinking groove, the inner wall of the movable valve seat is provided with a third oblique frustum of conical surface adapted to the first oblique frustum of conical surface, and the third oblique frustum of conical surface can Sliding, the area of the first plate on the side of the butterfly plate away from the valve shaft is larger than the area of the second plate, and the area of the end face of the movable valve seat on the side away from the valve shaft is larger than the area of the first plate on the side of the butterfly plate away from the valve shaft. The difference between the area of the first plate and the second plate, the fixed valve seat is provided with a plurality of communication through holes, the communication through holes are used for liquid to enter the gap between the movable valve seat and the fixed valve seat; The control assembly is used to drive the valve shaft to rotate. 2. The triple eccentric butterfly valve capable of bidirectional sealing according to claim 1, wherein the fixed valve seat includes a fixed valve housing and a movable sealing ring arranged in the fixed valve housing, and an annular groove is arranged in the fixed valve housing, and the movable The sealing ring is set in the annular groove, the diameter of the movable sealing ring is smaller than the diameter of the annular groove, so that the movable sealing ring can move in the annular groove, and the inner wall surface of the movable sealing ring and the inner wall surface of the fixed valve housing are used to form the second oblique cone table surface. 3. The triple eccentric butterfly valve capable of bidirectional sealing according to claim 2, characterized in that, the end surface of the butterfly plate away from the movable valve seat is fixed with a bushing, and the projection of the bushing on the butterfly plate divides the butterfly plate into the first The first plate and the second plate, the valve shaft is coaxially installed in the shaft sleeve and matched with the shaft sleeve to prevent rotation. 4. The bi-directionally sealed triple-eccentric butterfly valve according to claim 3, wherein a bracket is fixed on the end surface of the butterfly plate away from the valve seat, and the shaft sleeve is fixed on the bracket. 5. The triple eccentric butterfly valve capable of bidirectional sealing according to claim 4, wherein the sealing assembly further includes a rotation stop structure, which is used to prevent the movable valve seat from rotating in the circumferential direction, and the stop rotation structure includes a plurality of The contact through holes correspond to the anti-rotation columns plugged together one by one. The anti-rotation columns are fixed on the movable valve seat. The anti-rotation columns are provided with a gap extending along the axial direction of the anti-rotation column. The gap between the inner wall surfaces allows liquid to pass through. 6. The bi-directional sealing triple eccentric butterfly valve according to any one of claims 1-5, characterized in that the control assembly includes a handwheel assembly and a transmission assembly, the transmission assembly is connected to the valve shaft in transmission, and the handwheel assembly is used for Drive transmission components action. 7. The triple eccentric butterfly valve capable of bidirectional sealing according to claim 6, wherein the transmission assembly includes a first bevel gear and a second bevel gear that mesh with each other, and the handwheel assembly includes a handwheel and a handwheel fixedly connected to the handwheel. The drive shaft, the first bevel gear is fixed on the drive shaft, and the second bevel gear is fixed on the valve shaft.

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