Durable double-eccentric butterfly valve

Abstract

The utility model provides a durable double-eccentric butterfly valve, which comprises a valve body, a valve core, a valve core, a valve core and a valve core, the butterfly valve comprises a valve body, a valve rod, a butterfly plate and a valve seat, the bottom of the valve seat makes contact with the butterfly plate, the valve seat and the butterfly plate form soft sealing, the valve seat is fixed through a pressing ring, and the pressing ring is fixedly connected with the valve body through a screw. A mounting cavity for the valve seat and the pressing ring is formed in one side of the valve body, the section of the valve seat is of a C-shaped structure, the bottom of the valve seat is provided with an inclined face extending outwards in the radial direction, the two ends of the valve seat are provided with cambered surface transitions, and the inclined face makes contact with the outer surface of the butterfly plate when the butterfly plate is in a totally-closed state. The pressing ring is provided with a protrusion matched with the C-shaped cavity of the valve seat, the protrusion is embedded in the cavity of the valve seat, and the upper end of the pressing ring is fixed to the valve body through a screw. The sealing reliability of the valve seat, the butterfly plate and the valve body is ensured by adjusting the deformation of the valve seat in good time.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a double-eccentric butterfly valve that is durable in use. Background Art

[0002] Double eccentric butterfly valve is also called high performance butterfly valve, which is suitable for use in water pipelines as regulating and intercepting equipment.

[0003] The existing double eccentric butterfly valve has the following defects during its use: 1. The sealing valve seat will show different degrees of wear after being used for a period of time, and the valve seat needs to be replaced regularly to solve its sealing problem, resulting in valve failure; 2. During the deformation process of the existing valve seat structure, it is impossible to take into account the sealing between the valve body, which also reduces the life of the valve; technical personnel in this field urgently need to solve the above technical problems. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a double eccentric butterfly valve with durable use.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A double eccentric butterfly valve for durable use, comprising:

[0007] A valve body, wherein a flow channel is provided therein and passes through the valve body;

[0008] A valve stem rotatably mounted in the valve body;

[0009] A disc plate is fixed on the valve stem to rotate with the valve stem, the disc plate is located in the flow channel, and the valve stem drives the disc plate to rotate to control the opening and closing of the flow channel;

[0010] A valve seat is arranged in the valve body and is made of PTFE. The bottom of the valve seat contacts the disc plate and forms a soft seal with the disc plate. The valve seat is fixed by a pressure ring, and the pressure ring is fixedly connected to the valve body by screws.

[0011] A mounting cavity for a valve seat and a pressure ring is provided in one side of the valve body. The cross section of the valve seat is a C-shaped structure. The bottom of the valve seat has an inclined surface extending radially outward, and arc transitions are provided at both ends. The inclined surface contacts the outer surface of the disc plate when the disc plate is in a fully closed state.

[0012] The pressing ring is provided with a protrusion matching the C-shaped cavity of the valve seat, the protrusion is embedded in the valve seat cavity, and the upper end is fixed to the valve body by screws.

[0013] In a preferred embodiment of the present invention, the C-shaped cavity of the valve seat is larger than the protrusion of the pressure ring that matches it.

[0014] In a preferred embodiment of the present invention, the outer circumferential surface of the disc plate is configured as an inclined surface extending downward.

[0015] In a preferred example of the utility model, a packing assembly is provided on the top of the valve body, and the packing assembly includes a packing, a packing pressure plate and a clamping ring. A packing groove is provided on the top of the valve body, and the packing is arranged in the packing groove. A packing pressure plate is provided at the top of the packing, and a clamping ring is provided at the top of the packing pressure plate. The clamping ring is fastened to the valve body by bolts, and the valve stem passes through the packing groove, the packing, the packing pressure plate and the clamping ring in sequence and is connected with a rotating handle.

[0016] In a preferred embodiment of the present invention, the valve stem and the disc plate are connected by a pin.

[0017] In a preferred embodiment of the present invention, the valve stem has a valve stem center line that deviates from the valve body center line, and the disc plate has a disc plate center line that deviates from the valve stem center line.

[0018] Beneficial effects: The double-eccentric butterfly valve of the utility model is durable in use, and the reliability of sealing between the butterfly plate and the valve body is ensured by timely adjusting the deformation of the valve seat;

[0019] The valve seat is positioned by the pressure ring, and the deformation of the valve seat is controlled by adjusting the distance between the pressure ring and the valve body, so as to effectively compensate for the wear of the sealing surface. The specific implementation method can be achieved by adjusting the tightness of the screw or installing a gasket between the valve body and the pressure ring; the bottom of the valve seat has a radially outwardly extending inclined surface, which is more adaptable to the disc plate, increases the sealing surface, reduces friction, and has a better sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A front view of a durable double eccentric butterfly valve provided by the utility model;

[0021] Figure 2 A left side view of a durable double eccentric butterfly valve provided by the utility model;

[0022] Figure 3 It is a partial enlarged view of the installation of the valve seat and the disc plate of the utility model.

[0023] In the figure: 1 valve body;

[0024] 2 valve stem;

[0025] 3 disc plate;

[0026] 4 valve seat;

[0027] 5. Press the circle;

[0028] 6. Filling;

[0029] 7. Packing plate;

[0030] 8 Clamping ring. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] like Figure 1-2 As shown, the utility model provides a durable double eccentric butterfly valve, comprising:

[0033] A valve body 1, wherein a flow channel is provided therein and passes through the valve body 1;

[0034] A valve stem 2 rotatably mounted in the valve body 1;

[0035] The disc plate 3 is fixed on the valve stem 2 to rotate with the valve stem 2. The disc plate 3 is located in the flow channel. The valve stem 2 drives the disc plate 3 to rotate to control the opening and closing of the flow channel.

[0036] The valve seat 4 is arranged in the valve body 1 and is made of PTFE. The bottom of the valve seat 4 contacts the disc plate 3 and forms a soft seal with the disc plate 3. The valve seat 4 is fixed by a pressing ring 5, and the pressing ring 5 is fixedly connected to the valve body 1 by screws.

[0037] A mounting cavity for a valve seat 4 and a pressure ring 5 is provided in one side of the valve body 1. The cross section of the valve seat 4 is a C-shaped structure. The bottom of the valve seat 4 has an inclined surface extending radially outward, and arc transitions are provided at both ends. The inclined surface contacts the outer surface of the disc plate 3 when the disc plate 3 is in a fully closed state.

[0038] The pressing ring 5 has a protrusion matching the C-shaped cavity of the valve seat 4. The protrusion is embedded in the cavity of the valve seat 4, and the upper end is fixed to the valve body 1 by screws;

[0039] In the initial state, the pressure ring 5 presses the valve seat 4. At this time, the valve seat 4 is concave under the force and contacts the outer surface of the disc plate 3 to form a certain sealing surface;

[0040] like Figure 3As shown, after the butterfly valve has been used for a period of time, the contact surface between the valve seat 4 and the disc plate 3 will inevitably produce a certain amount of wear, which affects the sealing performance of the butterfly valve. Therefore, by installing a gasket between the valve body 1 and the pressure ring 5, the disc plate 3 is elastically deformed, the disc plate 3 is expanded outward, the contact surface with the disc plate 3 is increased and changed, and a new sealing surface is formed therewith; according to the degree of wear of the valve seat 4, a gasket of appropriate thickness can be arbitrarily allocated to make the disc plate 3 expand outward to different degrees, further seal the disc plate 3, and increase the durability of the butterfly valve.

[0041] On the basis of the above-mentioned embodiment, the C-shaped cavity of the valve seat 4 is larger than the protrusion of the matching pressing ring 5, so as to provide space for the disc plate 3 to be compressed and deformed.

[0042] On the basis of the above-mentioned embodiment, the outer circumferential surface of the disc plate 3 is configured as an inclined surface extending downward, so as to reduce friction with the valve seat 4 during the opening and closing process.

[0043] On the basis of the above embodiment, a packing assembly is provided on the top of the valve body 1, and the packing assembly includes a packing 6, a packing pressure plate 7 and a clamping ring 8. A packing groove is provided on the top of the valve body 1, and the packing 6 is arranged in the packing groove. A packing pressure plate 7 is provided on the top of the packing 6, and the clamping ring 8 is provided on the top of the packing pressure plate 7. The clamping ring 8 is fastened to the valve body 1 by bolts, and the valve stem 2 passes through the packing groove, the packing 6, the packing pressure plate 7 and the clamping ring 8 in sequence and is connected with a rotating handle;

[0044] Fill the packing 6 into the packing groove, and compact the packing 6 through the clamping ring 8 and the packing pressure plate 7 to seal the connection between the valve stem 2 and the valve body 1.

[0045] On the basis of the above-mentioned embodiment, the valve stem 2 and the disc plate 3 are connected by pins, which are quick to install and easy to replace.

[0046] On the basis of the above embodiment, the valve stem 2 has a valve stem center line deviating from the center line of the valve body 1, and the disc plate 3 has a disc plate center line deviating from the center line of the valve stem 2, thereby reducing wear and improving the service life of the valve seat 4.

[0047] In summary:

[0048] The utility model provides a durable double eccentric butterfly valve, which ensures the reliability of sealing between the valve seat 4, the disc plate 3 and the valve body 1 by timely adjusting the deformation of the valve seat 4.

[0049] The valve seat 4 is positioned by the pressing ring 5. The deformation of the valve seat 4 is controlled by adjusting the distance between the pressing ring 5 and the valve body 1, and the wear of the sealing surface is effectively compensated. In a specific implementation method, the tightness of the screw can be adjusted, or a gasket can be installed between the valve body 1 and the pressing ring 5; the bottom of the valve seat 4 has an inclined surface extending radially outward, which is more compatible with the disc plate 3, increases the sealing surface, reduces friction, and has a better sealing effect.

[0050] The above shows and describes the basic principle, main features and advantages of the utility model. The front, back, left and right used in the text are not specific, mainly for a more intuitive description of the technical solution, and do not have a limiting effect. The technical personnel in this industry should understand that the above implementation is only to illustrate the technical concept and characteristics of the utility model, and its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it, and it cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A double eccentric butterfly valve with durable use, characterized by: include A valve body (1) having a flow passage therein which passes through the valve body (1); A valve stem (2) rotatably mounted in the valve body (1); A disc plate (3) is fixed on the valve stem (2) to rotate with the valve stem (2), the disc plate (3) is located in the flow channel, and the valve stem (2) drives the disc plate (3) to rotate to control the opening and closing of the flow channel; A valve seat (4) is arranged in the valve body (1) and is made of PTFE. The bottom of the valve seat (4) contacts the disc plate (3) and forms a soft seal with the disc plate (3). The valve seat (4) is fixed by a pressure ring (5), and the pressure ring (5) is fixedly connected to the valve body (1) by screws. A mounting cavity for a valve seat (4) and a pressure ring (5) is provided in one side of the valve body (1); the cross section of the valve seat (4) is a C-shaped structure; the bottom of the valve seat (4) has an inclined surface extending radially outward, and arc transitions are provided at both ends; the inclined surface contacts the outer surface of the disc plate (3) when the disc plate (3) is in a fully closed state; The pressure ring (5) has a protrusion matching the C-shaped cavity of the valve seat (4); the protrusion is embedded in the cavity of the valve seat (4), and the upper end is fixed to the valve body (1) by screws.

2. A durable double eccentric butterfly valve according to claim 1, characterized in that: The C-shaped cavity of the valve seat (4) is larger than the protrusion of the matching pressing ring (5).

3. A durable double eccentric butterfly valve according to claim 1, characterized in that: The outer circumferential surface of the disc plate (3) is arranged as an inclined surface extending downward.

4. A durable double eccentric butterfly valve according to claim 1, characterized in that: A packing assembly is provided at the top of the valve body (1), and the packing assembly includes a packing (6), a packing pressure plate (7) and a clamping ring (8). A packing groove is provided at the top of the valve body (1), and the packing (6) is arranged in the packing groove. A packing pressure plate (7) is provided at the top of the packing (6), and a clamping ring (8) is provided at the top of the packing pressure plate (7). The clamping ring (8) is fastened to the valve body (1) by bolts, and the valve stem (2) passes through the packing groove, the packing (6), the packing pressure plate (7) and the clamping ring (8) in sequence and is connected to a rotating handle.

5. A durable double eccentric butterfly valve according to claim 1, characterized in that: The valve stem (2) and the disc plate (3) are connected by a pin.

6. A durable double eccentric butterfly valve according to claim 1, characterized in that: The valve stem (2) has a valve stem center line that deviates from the center line of the valve body (1), and the disc plate (3) has a disc plate center line that deviates from the center line of the valve stem (2).

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