Valve seat mounting structure and three-eccentric center butterfly valve

Abstract

The utility model provides a valve seat installation structure and a three-eccentric center butterfly valve, the valve seat installation structure comprises a check ring, the check ring is used for being installed in a valve body to limit a valve seat; an installation hole is formed in the check ring in the thickness direction of the check ring in a penetrating mode, a locking screw, an elastic piece and a rotation stopping screw are sequentially arranged in the installation hole in the direction from the valve seat to the outside of the valve body, and the elastic piece is used for providing pre-tightening force between the locking screw and the rotation stopping screw. According to the scheme, the mounting stability of the valve seat can be effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and particularly relates to a valve seat installation structure and a triple-eccentric butterfly valve. Background Art

[0002] Triple-eccentric butterfly valves have been highly favored in various industries due to their excellent sealing performance, long service life, small volume, low cost, etc., and are widely used in various fields such as petroleum, chemical industry, power plants, etc. In particular, triple-eccentric all-metal butterfly valves, because they use all-metal valve seats and sealing rings, have strict cut-off performance, and at the same time have characteristics such as wear resistance, corrosion resistance, and long service life, and can be used under harsh working conditions of high temperature and high pressure, ultra-low temperature, temperature alternation, and strong corrosive and particulate media.

[0003] Since most triple-eccentric all-metal butterfly valves are used in relatively harsh working conditions, for the convenience of maintenance and repair, most triple-eccentric all-metal butterfly valves use both the sealing ring and the valve seat as detachable valve body components, adopting a split-type valve seat and sealing ring, so that the valve seat and the sealing ring can be detached and replaced. However, with the split-type valve seat structure, the valve seat needs to be pressed onto the valve body by screws. If the valve is used in a working condition with large vibrations for a long time, or in a temperature alternation or high-frequency operation condition, the screws for pressing the valve seat are likely to become loose, causing the valve seat to move, thereby causing a relative displacement of the sealing position between the sealing ring and the valve seat, resulting in internal leakage of the valve, and even the screws falling off, affecting the use safety. Summary of the Utility Model

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a valve seat installation structure and a triple-eccentric butterfly valve to solve the above problems.

[0005] To achieve the above purpose and other related purposes, the present utility model provides a valve seat installation structure, including a retaining ring, the retaining ring is used for being installed in the valve body to limit the valve seat; an installation hole is penetrated along the thickness direction of the retaining ring, and from the valve seat towards the outside of the valve body, a locking screw, an elastic member, and a rotation-preventing screw are sequentially arranged in the installation hole, and the elastic member is used to provide a pre-tightening force between the locking screw and the rotation-preventing screw.

[0006] Optionally, one end of the rotation-preventing screw away from the elastic member plugs the installation hole.

[0007] Optionally, the elastic member is a disc spring, and two disc springs are overlapped and arranged.

[0008] Optionally, a slope is arranged on one side of the retaining ring close to the side wall of the valve body, and a limiting member for limiting the retaining ring is arranged between the valve body and the slope, and the retaining ring is limited between the valve seat and the limiting member by the limiting member.

[0009] Optionally, the inclined surface is disposed around the retaining ring in a circle, and the limiting member is a limiting ring disposed on the inclined surface.

[0010] Optionally, a medium flow channel is provided in the middle of the retaining ring.

[0011] To achieve the above and other related purposes, the present utility model provides a triple-eccentric butterfly valve, including a valve body, a valve seat, a valve stem, a valve plate assembly, and a valve seat mounting structure.

[0012] Optionally, the valve seat is installed in the valve body. A first stepped surface is provided on the surface of the valve seat facing the retaining ring, and a second stepped surface matching the first stepped surface is provided on the retaining ring. An adjustment cavity is formed between the first stepped surface and the second stepped surface, and the locking screw extends into the adjustment cavity and abuts against the valve seat.

[0013] As described above, the valve seat mounting structure and the triple-eccentric butterfly valve of the present utility model have the following beneficial effects:

[0014] In this solution, the valve seat and the valve body are two independent components, which is convenient for operations such as replacement. The setting of the retaining ring is to achieve the preliminary limit of the valve seat, and the setting of the locking screw is to tightly press the valve seat. The setting of the anti-rotation screw is to prevent the locking screw from rotating, ensuring that there is no relative position between the valve seat and the valve plate assembly to cause internal leakage. The elastic member is installed between the locking screw and the anti-rotation screw, so that during the long-term use of the triple-eccentric butterfly valve and in working conditions such as temperature alternation, a pre-tightening force is continuously provided for the locking screw and the anti-rotation screw, keeping the relative positions of the anti-rotation screw and the locking screw unchanged, thereby reducing the possibility of the valve seat loosening and the locking screw and the anti-rotation screw falling off, and improving the sealing performance and use safety. Description of the Drawings

[0015] Figure 1 It is an internal schematic diagram of the triple-eccentric butterfly valve in the embodiment of the present utility model.

[0016] Figure 2 For Figure 1 the enlarged view at A in Detailed Embodiment

[0017] The reference numerals in the accompanying drawings of the specification include: valve body 1, valve stem 2, valve plate assembly 3, valve seat 4, retaining ring 5, limiting ring 6, anti-rotation screw 7, disc spring 8, locking screw 9, adjustment cavity 10.

[0018] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0019] The present utility model provides a triple-eccentric butterfly valve, as Figure 1 shown inFigure 2 as shown

[0020] In an exemplary embodiment of the present application, a valve seat mounting structure is provided, including a retaining ring 5 for mounting inside a valve body 1 to limit a valve seat 4; a mounting hole is penetrated along the thickness direction of the retaining ring 5, and a locking screw 9, an elastic member, and a rotation-preventing screw 7 are sequentially arranged in the mounting hole from the valve seat 4 towards the outside of the valve body 1, and the elastic member is used to provide a pre-tightening force between the locking screw 9 and the rotation-preventing screw 7.

[0021] In this embodiment, the valve seat 4 and the valve body 1 are two independent components, facilitating operations such as replacement. The retaining ring 5 is provided to achieve the preliminary limitation of the valve seat 4, the locking screw 9 is provided to tightly press the valve seat 4, and the rotation-preventing screw 7 is provided to prevent the locking screw 9 from rotating, ensuring that there is no relative position between the valve seat 4 and the valve plate assembly 3 to cause internal leakage. The elastic member is installed between the locking screw 9 and the rotation-preventing screw 7, so that during the long-term use of the triple-eccentric butterfly valve and in working conditions such as temperature alternation, a pre-tightening force is continuously provided for the locking screw 9 and the rotation-preventing screw 7, keeping the relative positions between the rotation-preventing screw 7 and the locking screw 9 unchanged, thereby reducing the possibility of the valve seat 4 loosening and the locking screw 9 and the rotation-preventing screw 7 falling off, and improving the sealing performance and use safety.

[0022] Exemplarily, a flat surface for abutting against the valve seat 4 is provided on the locking screw 9.

[0023] In an exemplary embodiment, one end of the rotation-preventing screw 7 away from the elastic member plugs the mounting hole.

[0024] In this embodiment, the rotation-preventing screw 7 plugs the mounting hole, and when used in working conditions with particles, easy crystallization or coking, it can effectively prevent impurities from entering the inside of the locking screw 9, resulting in the situation where the valve seat 4 cannot be disassembled during maintenance or servicing.

[0025] In an exemplary embodiment, the elastic member is a disc spring 8, and two disc springs 8 are arranged in an overlapping manner.

[0026] In this embodiment, the elastic member is a disc spring 8. The elastic member can also be other springs.

[0027] In an exemplary embodiment, a slope is provided on one side of the retaining ring 5 close to the side wall of the valve body 1, and a limiting member for limiting the retaining ring 5 is arranged between the valve body 1 and the slope, and the retaining ring 5 is limited between the valve seat 4 and the limiting member by the limiting member.

[0028] It should be noted that the slope is provided to facilitate the installation of the limiting member, and the limiting member is provided to limit the retaining ring 5.

[0029] In an exemplary embodiment, the slope surrounds the retaining ring 5 in a circle, and the limiting member is a limiting ring 6 arranged on the slope.

[0030] In this embodiment, the limiting member is a limiting ring 6. To install the limiting ring 6, an installation position is provided on the valve body 1, and a bevel is provided on the retaining ring 5.

[0031] In an exemplary embodiment, a medium flow channel is provided in the middle of the retaining ring 5.

[0032] It should be noted that the medium flow channel is provided to facilitate the passage of the medium.

[0033] In an exemplary embodiment of the present application, a triple-eccentric butterfly valve is provided, which includes a valve body 1, a valve seat 4, a valve stem 2, a valve plate assembly 3, and a valve seat installation structure.

[0034] In this embodiment, through the setting of the valve seat installation structure, the sealing performance of the triple-eccentric butterfly valve and the installation stability of the valve seat 4 are effectively improved.

[0035] Exemplarily, the valve plate assembly 3 includes a valve plate, a sealing ring, a pressing ring, etc.

[0036] In an exemplary embodiment, the valve seat 4 is installed in the valve body 1. A first stepped surface is provided on the surface of the valve seat 4 facing the retaining ring 5, and a second stepped surface matching the first stepped surface is provided on the retaining ring 5. An adjustment cavity 10 is formed between the first stepped surface and the second stepped surface, and the locking screw 9 extends into the adjustment cavity 10 and abuts against the valve seat 4.

[0037] In this embodiment, the setting of the first stepped surface and the second stepped surface makes the contact surfaces between the retaining ring 5 and the valve seat 4 present a concave-convex match. Compared with the contact surface being set as a plane, it reduces the possibility of particulate matter and impurities in the medium entering the gap between the retaining ring 5 and the valve seat 4, and effectively prevents the locking screw 9 from being corroded and damaged.

[0038] The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A valve seat mounting structure, characterized in that, It includes a retaining ring which is used to be installed in the valve body to limit the valve seat; an installation hole is penetratingly opened along the thickness direction of the retaining ring, and from the valve seat towards the outside of the valve body, a locking screw, an elastic member and an anti-rotation screw are sequentially arranged in the installation hole, and the elastic member is used to provide a pre-tightening force between the locking screw and the anti-rotation screw.

2. The valve seat mounting structure according to claim 1, characterized in that, One end of the anti-rotation screw away from the elastic member plugs the installation hole.

3. The valve seat mounting structure according to claim 1, characterized in that, The elastic member is a disc spring, and two disc springs are arranged in an overlapping manner.

4. The valve seat mounting structure according to claim 1, characterized in that, One side of the retaining ring close to the side wall of the valve body is provided with an inclined surface, and a limiting member for limiting the retaining ring is arranged between the valve body and the inclined surface, and the retaining ring is limited between the valve seat and the limiting member by the limiting member.

5. The valve seat mounting structure according to claim 4, characterized in that, The inclined surface is arranged in a circle around the retaining ring, and the limiting member is a limiting ring arranged on the inclined surface.

6. The valve seat mounting structure according to claim 1, characterized in that, A medium flow channel is opened in the middle of the retaining ring.

7. A triple eccentric butterfly valve, characterized in that, It includes a valve body, a valve seat, a valve rod, a valve plate assembly and the valve seat installation structure according to any one of claims 1 to 6.

8. The triple eccentric butterfly valve according to claim 7, wherein, The valve seat is installed in the valve body, a first step surface is arranged on the surface of the valve seat facing the retaining ring, a second step surface matching the first step surface is arranged on the retaining ring, an adjustment cavity is formed between the first step surface and the second step surface, and the locking screw extends into the adjustment cavity and abuts against the valve seat.

Images