Ultralow-temperature top-mounted floating butterfly valve

Abstract

The utility model provides an ultralow-temperature top-mounted floating butterfly valve which comprises a valve body, a valve rod, a butterfly plate, a valve cavity and a valve seat, the valve cavity and the valve seat are arranged in the valve body, the valve rod drives the butterfly plate to rotate in the valve cavity and is matched with the valve seat to conduct or block fluid in the valve cavity, and an elastic supporting piece is arranged between the butterfly plate and the valve body. A detachable sealing ring matched with the valve seat is arranged on the periphery of the butterfly plate in a protruding mode. According to the butterfly valve, the butterfly plate is supported and positioned through the elastic supporting piece, the butterfly plate and the valve seat are matched in a floating mode, the position of the butterfly plate can be adjusted according to the closing position, the sealing matching position and the medium acting force, and the optimal sealing effect is achieved; the sealing ring is of a replaceable structure, the sealing face is the arc face, high universality is achieved, when the sealing structure is subjected to the cold shrinkage phenomenon under the ultralow-temperature working condition, sealing can be achieved by adjusting the position where linear sealing is formed, and sealing is more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to an ultra-low temperature top-loading floating butterfly valve. Background Art

[0002] A butterfly valve usually refers to a valve that uses a disc-type opening and closing member to rotate back and forth about 90° to open, close or regulate the flow of a medium. The butterfly valve is not only simple in structure, small in size, light in weight, saves material consumption, has a small installation size, small driving torque, is easy and quick to operate, but also has good flow regulation function and closing sealing characteristics. Therefore, the butterfly valve is widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower, etc.

[0003] With the rapid development of clean energy industries such as LNG, the demand for butterfly valves used in ultra-low temperature conditions is growing. Existing top-entry butterfly valves consist of a valve body, bonnet, stem, butterfly plate, and drive unit. The bonnet is fixed to the valve body via fasteners, and a metal spiral wound gasket seal is installed between the valve body and bonnet. The valve stem is perpendicular to the flow direction of the medium in the valve body and is fixed to the valve and bonnet. The outer end of the valve stem extends out of the bonnet and connects to the drive unit. The butterfly plate is fixed to the valve stem by a pin. Because the valve seat and valve body are integrated, the relative position of the butterfly plate sealing ring and the valve seat cannot be adjusted after the butterfly plate is fixed. This places high demands on machining accuracy and increases the difficulty of assembly and machining. The butterfly plate can be removed from the bonnet after removing the pin and then the valve stem to replace and repair the sealing ring. However, due to the universality of parts, there are significant limitations on equipment and machining difficulty.

[0004] In order to solve the above technical problems, the applicant has designed an ultra-low temperature top-loading floating butterfly valve. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings and deficiencies of the existing technology and to provide an ultra-low temperature top-loading floating butterfly valve. The technical solutions adopted by this utility model are as follows:

[0006] A super-low temperature top-mounted floating butterfly valve includes a valve body, a valve stem, a butterfly plate, and a valve cavity and valve seat arranged inside the valve body. The valve stem drives the butterfly plate to rotate in the valve cavity and cooperate with the valve seat to conduct or block the fluid in the valve cavity. An elastic support is arranged between the butterfly plate and the valve body, and a detachable sealing ring is provided on the circumference of the butterfly plate to cooperate with the valve seat.

[0007] Preferably, the side of the sealing ring close to the valve seat is an arc surface, so that the arc surface and the valve seat form a line seal; the sealing surface of the sealing ring adopts an arc surface design, and when the sealing ring shrinks under ultra-low temperature conditions, sealing can be achieved by adjusting the position of the line seal, making the seal more reliable.

[0008] Specifically, the sealing ring includes a mounting portion embedded in the butterfly plate and an arc surface protruding from the butterfly plate; the sealing surface of the valve seat is a cross-section of an oblique cone, and the arc surface faces the cross-section so that the arc surface and the valve seat form a linear seal.

[0009] Preferably, the valve stem passes through the valve cavity and rotates with the valve body, and the valve body is provided with a first notch near the valve stem for positioning and installing a positioning bearing; the outer periphery of the butterfly plate is provided with a second notch near the valve body for positioning and cooperating with the elastic support member.

[0010] Specifically, the elastic support member is an elastic sealing support ring located at the bottom of the valve body and sleeved on the lower end of the valve stem, so that the butterfly plate can self-adjust its position according to the closing position, sealing matching position and medium force to achieve the best sealing effect.

[0011] Preferably, a butterfly plate pressure ring is connected to the butterfly plate by bolts, and the sealing ring is axially limited between the butterfly plate and the butterfly plate pressure ring. The sealing ring is radially movable but does not fall out of between the butterfly plate and the butterfly plate pressure ring; the above-mentioned sealing member adopts a metal surfacing carbide structure, and the bolts are used to tighten the pressure ring to provide pre-tightening force and sealing ring movement space to ensure sealing.

[0012] Preferably, the valve stem and the butterfly plate are connected via a flat key.

[0013] The beneficial effects of the utility model are as follows: the butterfly valve supports and positions the butterfly plate through the elastic support member, so that the butterfly plate and the valve seat are matched in a floating manner. The butterfly plate can adjust its own position according to the closing position, the sealing matching position and the force of the medium to achieve the best sealing effect; the sealing ring is a replaceable structure with high compatibility;

[0014] The sealing surface of the sealing ring is an arc surface and forms a line seal with the valve seat. When the sealing structure shrinks under ultra-low temperature conditions, the sealing can be achieved by adjusting the position of the line seal to make the seal more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0016] Figure 1 Schematic diagram of the overall structure of the embodiment;

[0017] Figure 2 A schematic diagram of the structure for forming a floating seal fit;

[0018] Figure 3 Schematic diagram of the sealing ring structure;

[0019] In the figure, 1-valve body, 11-valve seat, 2-valve stem, 21-flat key, 3-valve chamber, 4-butterfly plate, 41-butterfly plate pressure ring, 42-sealing ring, 421-mounting part, 422-arc surface, 5-elastic support member, 6-positioning bearing. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the embodiments and the accompanying drawings.

[0021] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two non-identical entities or non-identical parameters with the same name. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. Subsequent embodiments will not explain this one by one.

[0022] The directional and positional terms used in this invention, such as "upper," "lower," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are used solely to refer to the directions or positions in the accompanying drawings. Therefore, the directional and positional terms used are intended to illustrate and facilitate understanding of this invention and are not intended to limit the scope of protection of this invention.

[0023] Example

[0024] like Figure 1-2 As shown, an ultra-low temperature top-mounted floating butterfly valve includes a driving handwheel, a valve body 1, a valve stem 2, a butterfly plate 4, and a valve cavity 3 and a valve seat 11 arranged inside the valve body 1. The valve stem 2 and the butterfly plate 4 are connected by a flat key 21. The driving handwheel drives the butterfly plate 4 to rotate in the valve cavity 3 through the valve stem 2 and cooperate with the valve seat 11 to conduct or block the fluid in the valve cavity 3. An elastic support member 5 is provided between the butterfly plate 4 and the valve body 1, and a detachable sealing ring 42 is provided on the circumference of the butterfly plate 4 to cooperate with the valve seat 11; the elastic support member 5 supports and positions the butterfly plate 4 so that the butterfly plate 4 and the valve seat are floatingly matched. The butterfly plate can adjust its own position according to the closing position, sealing matching position and medium force to achieve the best sealing effect; the sealing ring is a replaceable structure with high compatibility.

[0025] like Figure 3 As shown, the side of the sealing ring 42 close to the valve seat 11 is an arc surface 422, so that the arc surface 422 and the valve seat 11 form a line seal. When the sealing ring shrinks under ultra-low temperature conditions, the sealing can be achieved by adjusting the position of the line seal, making the seal more reliable.

[0026] In this embodiment, refer to the attached Figure 2 、 3 The sealing ring 42 includes a mounting portion 421 embedded in the butterfly plate and a circular arc surface 422 protruding from the butterfly plate; the sealing surface of the valve seat 11 is a cross-section of an oblique cone, and the circular arc surface 422 faces the sealing surface so that the circular arc surface 422 and the valve seat 11 form a linear seal.

[0027] Furthermore, the valve body 1 is provided with a first notch near the valve stem 2 for positioning and installing the positioning bearing 6; the outer periphery of the butterfly plate 4 is provided with a second notch near the valve body 1 for positioning and cooperating with the elastic support member 5, and the elastic support member 5 is an elastic sealing support ring located at the bottom of the valve body 1 and sleeved on the lower end of the valve stem 2, so that the butterfly plate can self-adjust its own position according to the closing position, sealing cooperation position and medium force to achieve the best sealing effect.

[0028] Refer to the attached Figure 2 The butterfly plate 4 is connected to the butterfly plate pressure ring 41 by bolts, and the sealing ring 42 is axially limited between the butterfly plate 4 and the butterfly plate pressure ring 41. The sealing ring 42 is radially movable but does not fall out of the space between the butterfly plate 4 and the butterfly plate pressure ring 41; the above-mentioned sealing member adopts a metal surfacing carbide structure, and the bolts are used to tighten the pressure ring to provide pre-tightening force and sealing ring activity space to ensure sealing.

[0029] In summary, the ultra-low temperature top-entry floating butterfly valve is optimized in structural design, which solves a series of problems of conventional top-entry butterfly valves such as poor low temperature performance and poor reverse sealing effect, ensuring the safe operation of valves and equipment facilities.

[0030] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A cryogenic top-loading floating butterfly valve, comprising a valve body (1), a valve stem (2), a butterfly plate (4), and a valve cavity (3) and a valve seat (11) disposed within the valve body (1), wherein the valve stem (2) drives the butterfly plate (4) to rotate within the valve cavity (3) and cooperates with the valve seat (11) to conduct or block the fluid in the valve cavity (3), and is characterized in that: An elastic support member (5) is provided between the butterfly plate (4) and the valve body (1), and a detachable sealing ring (42) is provided protruding around the butterfly plate (4) and matched with the valve seat (11).

2. The ultra-low temperature top-loading floating butterfly valve according to claim 1, characterized in that: The side of the sealing ring (42) close to the valve seat (11) is a circular arc surface (422), so that the circular arc surface (422) and the valve seat (11) form a linear seal.

3. The ultra-low temperature top-entry floating butterfly valve according to claim 1, characterized in that: The sealing ring (42) comprises a mounting portion (421) embedded in the butterfly plate and an arc surface (422) protruding from the butterfly plate.

4. The ultra-low temperature top-entry floating butterfly valve according to claim 3, characterized in that: The sealing surface of the valve seat (11) is a cross-section of an oblique cone, and the arc surface (422) faces the sealing surface of the valve seat (11) so that the arc surface (422) and the valve seat (11) form a line seal.

5. The ultra-low temperature top entry floating butterfly valve according to claim 1, characterized in that: The valve stem (2) passes through the valve cavity (3) and is rotatably engaged with the valve body (1); a first notch for positioning and installing a positioning bearing (6) is provided on the valve body (1) near the valve stem (2).

6. The ultra-low temperature top entry floating butterfly valve according to claim 5, characterized in that: A second notch is provided on the outer periphery of the butterfly plate (4) near the valve body (1) for positioning and matching with the elastic support member (5).

7. The ultra-low temperature top entry floating butterfly valve according to claim 6, characterized in that: The elastic support member (5) is an elastic sealing support ring located at the bottom of the valve body (1) and sleeved on the lower end of the valve stem (2).

8. The ultra-low temperature top entry floating butterfly valve according to claim 1, characterized in that: A butterfly plate pressing ring (41) is connected to the butterfly plate (4) via bolts, and the sealing ring (42) is axially limited between the butterfly plate (4) and the butterfly plate pressing ring (41).

9. The ultra-low temperature top entry floating butterfly valve according to claim 1, characterized in that: The valve stem (2) and the butterfly plate (4) are connected via a flat key (21).

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