CN115388183A - An all-metal high-pressure butterfly valve and its assembly method - Google Patents

Abstract

The present invention provides an all-metal high-pressure butterfly valve, comprising: a valve body, a channel is arranged inside the valve body along the axial direction; a valve stem is inserted into the valve body along the radial direction of the valve body; a valve plate, Sleeved on the valve stem and arranged in the channel; and the valve seat, through the pressing parts sequentially pierced on the valve seat and the valve body, to press one end of the valve seat on the On the valve body, the other end of the valve seat is used to abut against the pipeline flange, so that the other end of the valve seat and the pressing member are compressed by the pipeline flange. The present invention compresses the valve seat on the valve body through the pressing parts sequentially pierced on the valve seat and the valve body, thereby improving the pressing effect of the valve seat on the valve body. At the same time, the other side of the valve seat is in contact with the pipeline flange and is pressed by the pipeline flange to improve the compression effect of the valve seat. One end of the pressing piece is also pressed by the pipe flange, which improves the stability of the pressing piece again and prevents the pressing piece from loosening or even falling off.

Description

An all-metal high-pressure butterfly valve and its assembly method

technical field

The invention relates to the technical field of valves, in particular to an all-metal high-pressure butterfly valve and an assembly method thereof.

Background technique

With the gradual improvement of my country's industrialization level, the demand for valve products in the fields of petroleum, electric power, metallurgy, chemical industry and urban construction has also increased correspondingly, and the requirements are more detailed and specific. Therefore, in order to provide users with better services, the market has gradually formed According to the special process of various special devices, the most practical valve structure is developed.

The high-pressure butterfly valve belongs to the field of triple-eccentric all-metal valves. Its sealing structure adopts an independent all-metal sealing structure. The valve seat and sealing ring are relatively independent, detachable and interchangeable. The sealing principle belongs to line sealing, so the valve seat and sealing ring The relative position of the rings plays a vital role in the sealing performance of the valve. During the opening and closing process of the valve, the independent valve seat needs to be tightened with screws. After a long time, due to the opening of the high-pressure valve plate, the closing impact force is large, and the valve seat pressing screw is easy to loosen, which can easily cause the gap between the sealing pairs. The relative position of the valve changes, causing the valve to leak, and there is a risk of the compression screw falling.

Secondly, the valve seat retaining ring must be cut into three sections before it can be installed normally. During the installation process of the valve seat, the three-section valve seat retaining ring and the valve seat are prone to uneven contact between the sealing pairs due to uneven hands. Deformation, resulting in poor sealing performance. Moreover, in this structure, it is necessary to continuously tighten the lock nuts in a small space until each lock nut on the entire circumference is fully tightened to achieve the best sealing effect. Due to the small space, the operation is very inconvenient. Therefore, the difficulty of assembly is large and the efficiency is slow. Especially during on-site maintenance, it is time-consuming and labor-intensive to dismantle and replace the valve seat and then adjust the valve seat compression screw.

Contents of the invention

In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide an all-metal high-pressure butterfly valve and its assembly method, which is used to solve the problem in the prior art that the valve seat compression screw is easy to loosen and fall, resulting in valve leakage. question.

In order to achieve the above purpose and other related purposes, the present invention provides an all-metal high-pressure butterfly valve, including:

A valve body, the interior of the valve body is provided with a channel along the axial direction;

a valve stem inserted into the valve body along the radial direction of the valve body;

a valve plate sleeved on the valve stem and disposed in the channel; and

The valve seat is used to compress one end of the valve seat on the valve body through the pressing parts sequentially pierced on the valve seat and the valve body, and the other end of the valve seat is used for connecting with the pipeline method. The flange is against each other, so that the other end of the valve seat and the pressing piece are compressed by the pipeline flange.

Optionally, the valve seat is provided with a valve seat pressing hole in the axial direction, and the valve body is provided with a valve body connection hole in the axial direction, and the pressing member penetrates the valve seat pressing hole and the valve body in sequence. The connecting hole of the valve body, and the pressing piece is connected with the pressing hole of the valve seat and the connecting hole of the valve body respectively.

Optionally, the valve seat is provided with a valve seat stepped portion, and the valve body is provided with a valve body stepped portion, and the valve seat and the valve body are positioned and matched with the valve body stepped portion through the valve seat stepped portion.

Optionally, the valve seat stepped portion includes a first valve seat section, a second valve seat section and a third valve seat section connected in sequence, and the first valve seat section, the second valve seat section and the third valve seat section The outer diameter of the seat segment gradually decreases along the direction close to the valve body, the valve body step part includes a first valve body segment, a second valve body segment and a third valve body segment connected in sequence, and the first valve body The inner diameter of the body section, the second valve body section and the third valve body section increases gradually along the direction close to the valve seat, and the first valve seat section, the second valve seat section and the third valve seat section are respectively connected to the The first valve body segment, the second valve body segment and the third valve body segment are matched correspondingly.

Optionally, the pressing pieces are arranged outside the passage to increase the flow of the passage, the number of the pressing pieces is multiple, and the pressing pieces are evenly distributed along the circumference of the valve seat.

Optionally, a first sealing ring and a second sealing ring wound on the pressing member are arranged between the pressing hole of the valve seat and the connecting hole of the valve body.

Optionally, a third sealing ring and a fourth sealing ring are arranged between the valve seat and the valve body.

Optionally, the outer peripheral side of the valve body is provided with threads for connecting with pipeline flanges.

Optionally, a packing assembly for sealing is arranged between the valve body and the valve stem.

The present invention also provides an assembly method for an all-metal high-pressure butterfly valve, which is used for assembling the above-mentioned all-metal high-pressure butterfly valve, including:

Insert the valve stem from the bottom of the shaft hole in the valve body and through the valve plate;

Set a gasket between the end cover and the bottom of the valve body, turn the valve stem and check whether the valve stem can rotate;

Install the packing assembly between the valve body and the valve stem from bottom to top, and fix the packing assembly;

Install the valve seat on the valve body, and press the valve body and the valve seat tightly by installing the compression piece;

On the full metal sealing ring on the valve plate, after adjusting the full metal sealing ring to coincide with the axis of the valve plate, pre-tighten the pressing part;

Adjust the centering of the valve seat and the all-metal sealing ring;

Tighten the compression piece again.

As mentioned above, an all-metal high-pressure butterfly valve of the present invention has the following beneficial effects:

The present invention compresses the valve seat on the valve body through the pressing parts sequentially pierced on the valve seat and the valve body, thereby improving the pressing effect of the valve seat on the valve body. At the same time, the other side of the valve seat is in contact with the pipeline flange and is pressed by the pipeline flange to improve the compression effect of the valve seat. One end of the pressing piece is also pressed by the pipe flange, which improves the stability of the pressing piece again and prevents the pressing piece from loosening or even falling off.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the embodiment of the present invention;

Fig. 2 is the partially enlarged view of place A of the embodiment of the present invention;

Fig. 3 is a schematic diagram of the structure of the stepped portion of the valve seat according to the embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a stepped portion of a valve body according to an embodiment of the present invention;

Fig. 5 is a partially enlarged view of part B of the embodiment of the present invention.

Part number description

1-valve body; 2-valve seat; 3-pressing piece; 4-valve plate; 5-valve stem; 6-end cap; 7-end cap bolt; 8-first sealing ring; 9-second sealing ring ;10-the third seal ring; 11-channel; 12-the fourth seal ring; 13-packing assembly; 14-bearing; 15-push ring; 16-sealing gasket; Circle; 19-valve plate inner hexagon bolt; 21-first valve seat section; 22-second valve seat section; 23-third valve seat section; 121-first valve body section; 122-second valve body section; 123 - the third valve body section.

Detailed ways

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily during actual implementation, and the component layout type may also be more complicated. The structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification for the understanding and reading of those who are familiar with this technology, and are not used to limit the conditions for the implementation of the present invention , so it has no technical substantive meaning, and any modification of structure, change of proportional relationship or adjustment of size shall still fall within the scope of the disclosure disclosed in the present invention without affecting the functions and objectives of the present invention. The technical content must be within the scope covered. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of this specification. The practicable scope of the invention and the change or adjustment of its relative relationship shall also be regarded as the practicable scope of the present invention without any substantial change in the technical content.

Referring to FIGS. 1 to 5 , this embodiment provides an all-metal high-pressure butterfly valve, including a valve body 1 , a valve stem 5 , a valve plate 4 and a valve seat 2 . The inside of the valve body 1 is provided with a channel 11 for medium circulation in the axial direction, and the bottom of the valve body 1 is provided with an end cover 6 . The valve body 5 is provided with a through shaft hole radially, and the valve rod 1 penetrates from the bottom of the shaft hole of the valve body 5 and passes through the valve plate 4 . The valve plate 4 is sheathed on the valve stem 1 , and the valve plate 4 is set in the channel 11 . The valve seat 2 is arranged in the channel 11 of the valve body 1 , and the top and bottom of the valve seat 2 respectively abut against the top inner wall and the bottom inner wall of the channel 11 . The right end of the valve seat 2 is offset against the left end of the valve body 1, the left end of the valve seat 2 is offset against the pipeline flange, and the left end of the valve seat 2 is clamped by the pipeline flange. The pressing part 3 penetrates through the valve seat 2 and the valve body 1 sequentially along the horizontal direction, and presses the valve seat 2 on the valve body 1. The left end of the pressing part 3 is also pressed and fixed by the pipe flange. The valve seat 2 is an integral independent valve seat, including a connecting flange and a valve seat body connected with the connecting flange.

The present invention compresses the valve seat 2 on the valve body 1 by sequentially passing through the pressing member 3 on the valve seat 2 and the valve body 1, thereby improving the pressing effect of the valve seat 2 on the valve body 1 . At the same time, the other end of the valve seat 2 abuts against the pipeline flange and is compressed by the pipeline flange, thereby improving the compression effect of the valve seat 2 . One end of the pressing part 3 is also compressed by the pipeline flange, which improves the stability of the pressing part 3 again and prevents the pressing part 3 from loosening or even falling off.

In one embodiment, the valve seat 2 is provided with a valve seat pressing hole in the axial direction, and the valve body 1 is provided with a valve body connection hole in the axial direction, the valve seat pressing hole is a through hole, and the valve body connection hole is a threaded hole. The valve seat pressing hole and the valve body connecting hole are at the same level, and the diameters of the valve seat pressing hole and the valve body connecting hole are equal, and the pressing piece 3 passes through the valve seat pressing hole and the valve body connecting hole in turn The valve seat 2 is pressed on the valve body 1, and the pressing piece 3 is threadedly connected with the connecting hole of the valve body.

In one embodiment, as shown in FIG. 3 to FIG. 5 , a valve seat step is provided on the valve seat 2 , the valve seat step is provided on the outer peripheral side of the valve seat 2 , and the valve seat step is stepped. A valve body stepped portion is provided on the inner wall of the channel 11 of the valve body 1 , and the valve body stepped portion is in a stepped shape matched with the valve seat stepped portion. The right end and the peripheral side of the valve seat 2 are positioned on the valve body 1 through the cooperation between the valve seat 2 and the valve body 1 through the cooperation between the valve seat step and the valve body step.

In one embodiment, as shown in FIGS. 3 to 5 , the valve seat step portion includes a first valve seat section 21 , a second valve seat section 22 and a third valve seat section 23 connected in sequence. The first valve seat section 21 1. The outer diameters of the second valve seat section 22 and the third valve seat section 23 gradually decrease along the direction approaching the valve body 1 , that is, the outer diameters gradually decrease from left to right. The stepped part of the valve body includes a first valve body segment 121, a second valve body segment 122 and a third valve body segment 123 connected in sequence, and the first valve body segment 121, the second valve body segment 122 and the third valve body segment 123 are along the The inner diameter gradually increases in the direction close to the valve seat 2, that is, the inner diameter gradually increases from right to left. The outer peripheral side of the first valve seat section 21 is in contact with the inner wall of the third valve body section 123, the outer peripheral side of the second valve seat section 22 is in contact with the inner wall of the second valve body section 122, and the outer peripheral side of the third valve seat section 23 is in contact with the inner wall of the second valve body section 122. The inner walls of the first valve body section 121 are in contact with each other, which is convenient for positioning and fixing the valve seat 2 in the radial direction. Each right end surface of the valve seat 2 is respectively opposed to the vertical inner wall of the channel 11 , so as to press the valve seat 2 onto the valve body 1 .

In one embodiment, as shown in FIG. 1, the pressing member 3 is arranged outside the channel 11, that is, the pressing member 3 is arranged outside the standard flow channel. Compared with the prior art, the inner channel 11 is emptied The position of the pressing part 3 can greatly improve the flow capacity of the valve. In the case of the same flow requirements, this solution can choose a smaller caliber, and the cost is greatly reduced. There are multiple pressing pieces 3, and the pressing pieces 3 are evenly distributed along the circumferential direction of the valve seat 2, and the pressing pieces 3 include pressing screws.

In one embodiment, as shown in Figure 2, a first sealing ring 8 and a second sealing ring 9 wound on the pressing member 3 are arranged between the valve seat pressing hole and the valve body connection hole, the first sealing ring 8 and the second sealing ring 9 are both winding sealing rings. The winding sealing ring can prevent the medium from passing through the screw to cause internal leakage. The first sealing ring 8 and the second sealing ring 9 form a double sealing structure, and the sealing effect is better.

In one embodiment, as shown in FIG. 2 , a third sealing ring 10 and a fourth sealing ring 12 are provided between the valve seat 2 and the valve body 1 to increase the sealing performance between the valve seat 2 and the valve body 1 . The third sealing ring 10 is an O-ring, and the fourth sealing ring 12 is a winding sealing ring.

In one embodiment, the outer peripheral side of the valve body 1 is provided with threads for connecting with pipeline flanges, which can shorten the flange distance to the maximum extent according to the standard, and save the manufacturing cost and installation space to the greatest extent from the structural design, and at the same time While satisfying the performance of the valve, it solves the load on the pipeline flange and increases the safety performance of the valve.

In one embodiment, as shown in FIG. 1 , a packing assembly 13 for sealing is provided between the valve body 1 and the valve stem 5 .

As shown in Figure 1, this embodiment also provides an assembly method for an all-metal high-pressure butterfly valve, including:

Check the matching state between the bearing 14 and the valve stem 5, whether it is too loose or too tight, and after checking that there is no problem, assemble the bearing 14 into the valve body 1;

Insert the thrust ring 15 into the ring groove of the valve stem 5 and check whether the thrust ring 15 can rotate in the ring groove of the valve stem 5. Insert the valve stem 5 from the bottom of the shaft hole of the valve body 1 and pass through the valve Plate 4, until the thrust ring 15 is attached to the bottom end surface of the shaft hole of the valve body 1;

A gasket 16 is provided between the end cover 6 and the bottom of the valve body 1, a spring washer is provided between the end cover bolt 7 and the end cover 6, and the end cover 6 is installed to the bottom of the valve body 1 through the end cover bolt 7, and the valve is rotated. Stem 5 and check whether the valve stem 5 can rotate;

Insert the packing assembly 13 between the valve body 1 and the valve stem 5 from bottom to top, and tighten and fix it with the packing pressing bolt 17;

Mark the position of each sealing ring on the contact position between the valve body 1 and the valve seat 2 respectively, and install each sealing ring in sequence, install the valve seat 2 on the valve body 1, and install the pressing piece 3 The valve body 1 is pressed against the valve seat 2;

On the valve plate 1, install the fifth sealing ring 18, all metal sealing ring, pressure ring and valve plate inner hexagonal bolt 19 in sequence, adjust the full metal sealing ring to coincide with the axis of the valve plate 1, and pre-tighten the pressing part 3;

Adjust the centering of the valve seat 1 and the all-metal sealing ring, and use tools to repeatedly open and close the valve plate 4, so that the sealing surface between the valve plate 4 and the all-metal sealing ring fits in the middle, and tighten the valve by diagonal screwing. Plate inner hexagonal bolt 19, press the valve seat 2 and tighten the pressing part 3, and tighten the valve plate inner hexagonal bolt 19 each time the valve seat 2 is aligned with the full metal sealing ring, and the valve plate 4 and the full metal sealing ring With the pressing part 3, and at least centering and tightening 3 times;

Tighten the pressure piece 3 again with an electrical wrench.

The invention provides an assembly method of an all-metal high-pressure butterfly valve, improves the one-time assembly pass rate of the valve, and simultaneously solves the problems of assembly and on-site maintenance of the traditional independent valve seat.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

Claims (10)

1. An all-metal high-pressure butterfly valve, characterized in that it comprises: A valve body, the inside of the valve body is provided with a channel along the axial direction, and the valve body is provided with an end cover; a valve stem inserted into the valve body along the radial direction of the valve body; a valve plate sleeved on the valve stem and disposed in the channel; and The valve seat is used to compress one end of the valve seat on the valve body through the pressing parts sequentially pierced on the valve seat and the valve body, and the other end of the valve seat is used for connecting with the pipeline method. The flange is against each other, so that the other end of the valve seat and the pressing piece are compressed by the pipeline flange. 2. The all-metal high-pressure butterfly valve according to claim 1, characterized in that: the valve seat is provided with a valve seat pressing hole in the axial direction, and the valve body is provided with a valve body connecting hole in the axial direction, and the pressing hole is arranged in the axial direction. The pressing piece penetrates into the pressing hole of the valve seat and the connecting hole of the valve body in sequence, and the pressing piece is respectively connected with the pressing hole of the valve seat and the connecting hole of the valve body. 3. The all-metal high-pressure butterfly valve according to claim 1, characterized in that: the valve seat is provided with a valve seat stepped portion, the valve body is provided with a valve body stepped portion, and the gap between the valve seat and the valve body is The space is matched with the stepped portion of the valve body through the stepped portion of the valve seat. 4. The all-metal high-pressure butterfly valve according to claim 3, characterized in that: the valve seat step portion includes a first valve seat section, a second valve seat section and a third valve seat section connected in sequence, and the first valve seat section The first valve seat section, the second valve seat section and the third valve seat section gradually decrease in outer diameter along the direction close to the valve body, and the valve body step part includes the first valve body section, the second valve body section connected in sequence segment and the third valve body segment, and the inner diameter of the first valve body segment, the second valve body segment and the third valve body segment gradually increases along the direction close to the valve seat, the first valve seat segment, the second valve body segment The second valve seat section and the third valve seat section correspond to the first valve body section, the second valve body section and the third valve body section respectively. 5. The all-metal high-pressure butterfly valve according to claim 1, characterized in that: the pressing member is arranged outside the passage to increase the flow of the passage, the number of the pressing member is multiple, and the The pressing parts are evenly distributed along the circumference of the valve seat. 6. The all-metal high-pressure butterfly valve according to claim 1, characterized in that: a first sealing ring and a second sealing ring wound on the pressing member are arranged between the pressing hole of the valve seat and the connecting hole of the valve body. sealing ring. 7. The all-metal high-pressure butterfly valve according to claim 1, wherein a third sealing ring and a fourth sealing ring are arranged between the valve seat and the valve body. 8. The all-metal high-pressure butterfly valve according to claim 1, characterized in that: the outer peripheral side of the valve body is provided with threads for connecting with pipeline flanges. 9. The all-metal high-pressure butterfly valve according to claim 1, wherein a packing assembly for sealing is provided between the valve body and the valve stem. 10. An assembly method for an all-metal high-pressure butterfly valve, used for assembling the all-metal high-pressure butterfly valve according to any one of claims 1 to 9, characterized in that: Insert the valve stem from the bottom of the shaft hole in the valve body and through the valve plate; Set a gasket between the end cover and the bottom of the valve body, turn the valve stem and check whether the valve stem can rotate; Install the packing assembly between the valve body and the valve stem from bottom to top, and fix the packing assembly; Install the valve seat on the valve body, and press the valve body and the valve seat tightly by installing the compression piece; On the full metal sealing ring on the valve plate, after adjusting the full metal sealing ring to coincide with the axis of the valve plate, pre-tighten the pressing part; Adjust the centering of the valve seat and the all-metal sealing ring; Tighten the compression piece again.

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