Pressure relief type butterfly valve

Abstract

The pressure relief type butterfly valve comprises a valve seat, a top support and a bottom support, the valve seat is in a circular ring shape, the top support is arranged in the center of the top of the valve seat, the bottom support is arranged at the bottom of the valve seat, a valve shaft is arranged in the top support, the valve seat and the bottom support, and the top of the valve shaft is connected with a rotating handle. A sealing ring is arranged on the inner diameter surface of the valve seat, and a butterfly plate is arranged on the inner diameter surface of the sealing ring and located on the surface of the valve shaft. On the basis of a butterfly valve in the prior art, the U-shaped pipe is arranged at the position of the butterfly valve, when the butterfly valve needs to be opened and the difference value of water pressure on the two sides of the butterfly valve is large, the rotating handle is rotated firstly, the sealing performance between the sealing piece and the second through hole is slightly broken, then water at the high-pressure position flows to the low-pressure position through the U-shaped pipe, and therefore the butterfly valve is opened. According to the pressure relief butterfly valve, pressure relief is achieved through the U-shaped pipe, and the pressure relief butterfly valve has certain practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, in particular to a pressure relief butterfly valve. Background Art

[0002] The butterfly valve, also known as the flap valve, is a simple regulating valve that can be used for the on-off control of low-pressure pipeline media. The butterfly valve refers to a valve whose closing part (valve disc or butterfly plate) is a disc that rotates around the valve axis to achieve opening and closing. It can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. It mainly plays a role of cutting off and throttling on the pipeline. The opening and closing part of the butterfly valve is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening, closing or regulating.

[0003] However, the structure of the butterfly valve in the prior art is relatively easy to close the valve, but when the valve needs to be opened, if the pressure difference before and after the valve is large, it is easy to cause a more complicated opening situation, or even a situation where the valve cannot be opened, which has certain limitations. Utility Model Content

[0004] The utility model aims to provide a pressure relief butterfly valve to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pressure relief butterfly valve, comprising a valve seat, a top bracket, and a bottom bracket, the valve seat is annular, a top bracket is arranged at the top center of the valve seat, a bottom bracket is arranged at the bottom of the valve seat, a valve shaft is arranged inside the top bracket, the valve seat, and the bottom bracket, the top of the valve shaft is connected to a rotating handle, a sealing ring is arranged on the inner diameter surface of the valve seat, a butterfly plate is arranged on the inner diameter surface of the sealing ring, the butterfly plate is located on the surface of the valve shaft, a U-shaped tube is arranged at the center of the outer surface of the valve seat, the two ends of the U-shaped tube are respectively located on both sides of the outer surface of the valve seat, a first through hole is opened at the connection between the two ports of the valve seat and the U-shaped tube, a second through hole is opened at the corresponding position of the sealing ring and the first through hole, a sealing member is arranged on the front side of the two second through holes, a connecting rod is arranged at the back center of the sealing member, and the other end of the connecting rod is connected to the butterfly plate.

[0006] Preferably, the connecting rod is made of rubber.

[0007] Preferably, the diameter of the sealing member is larger than the diameter of the second through hole.

[0008] Compared with the prior art, the beneficial effects of the utility model are:

[0009] The utility model discloses a pressure relief butterfly valve, based on the butterfly valve of the prior art, in which a U-shaped tube is arranged at the butterfly valve. When the water pressure difference on both sides of the butterfly valve is large when the butterfly valve needs to be opened, the rotary handle is firstly rotated to slightly break the sealing between the sealing member and the second through hole, and then the water at the high pressure point flows to the low pressure point through the U-shaped tube, so that the water pressure on both sides of the butterfly valve is balanced, and then the rotary handle can be rotated again to fully open the butterfly plate. The utility model realizes pressure relief through the U-shaped tube, and has certain practicality.

[0010] When the butterfly plate of the pressure relief butterfly valve of the utility model is closed, the vertical surface of the butterfly plate will be at 90 degrees, and at this time the sealing element will seal the second through hole to prevent water from flowing from the U-shaped tube to the other side of the butterfly plate.

[0011] The utility model provides a pressure relief butterfly valve. When the butterfly plate is rotated by rotating the handle, the connecting rod connecting the sealing member and the butterfly plate is elastic, so the position of the sealing member can be changed better, which has certain practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] In the figure: 1. valve seat; 2. top bracket; 3. rotating handle; 4. bottom bracket; 5. butterfly plate; 6. sealing ring; 7. sealing element; 8. connecting rod; 9. U-shaped tube. DETAILED DESCRIPTION

[0014] 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 in 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.

[0015] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0016] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] See also Figure 1 The utility model provides a technical solution: a pressure relief butterfly valve, including a valve seat 1, a top bracket 2, and a bottom bracket 4. The valve seat 1 is annular, and a top bracket 2 is arranged at the top center of the valve seat 1, and a bottom bracket 4 is arranged at the bottom of the valve seat 1. A valve shaft is arranged inside the top bracket 2, the valve seat 1, and the bottom bracket 4, and the top of the valve shaft is connected to a rotating handle 3. It should be noted that the utility model uses the prior art to rotate the valve shaft by rotating the handle 3, which will not be described in detail here. The inside of the valve seat 1 A sealing ring 6 is provided on the diameter surface, a butterfly plate 5 is provided on the inner diameter surface of the sealing ring 6, the butterfly plate 5 is located on the surface of the valve shaft, a U-shaped tube 9 is provided at the center of the outer surface of the valve seat 1, and the two ends of the U-shaped tube 9 are respectively located on both sides of the outer surface of the valve seat 1, a first through hole is opened at the connection between the two ports of the valve seat 1 and the U-shaped tube 9, a second through hole is opened at the corresponding position of the sealing ring 6 and the first through hole, a sealing member 7 is provided on the front side of the two second through holes, a connecting rod 8 is provided at the center of the back side of the sealing member 7, and the other end of the connecting rod 8 is connected to the butterfly plate 5.

[0018] Furthermore, the connecting rod 8 is made of rubber. When the butterfly plate 5 is rotated by rotating the handle 3, the connecting rod 8 connecting the seal 7 and the butterfly plate 5 is elastic, so the position of the seal can be changed better, which has certain practicality.

[0019] Furthermore, the diameter of the seal 7 is larger than the diameter of the second through hole. Because the diameter of the seal 7 is larger than the diameter of the second through hole, the second through hole can be sealed by the seal 7 to prevent water from flowing from the U-shaped tube 9 to the other side of the butterfly plate 5 when the butterfly plate 5 is closed.

[0020] Working principle: A pressure relief butterfly valve of the utility model is based on the butterfly valve of the prior art, and a U-shaped tube 9 is arranged at the butterfly valve. When the water pressure difference on both sides of the butterfly valve is large when the butterfly valve needs to be opened, the rotating handle 3 is first rotated to slightly break the sealing between the seal 7 and the second through hole, and then the water at the high pressure will flow to the low pressure through the U-shaped tube 9, so that the water pressure on both sides of the butterfly valve is balanced, and then the rotating handle 3 is rotated again to fully open the butterfly plate 5. The utility model realizes pressure relief through the U-shaped tube, which has certain practicality.

[0021] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure relief butterfly valve, comprising a valve seat (1), a top bracket (2), and a bottom bracket (4), characterized in that: The valve seat (1) is in the shape of a circular ring. A top bracket (2) is arranged at the top center of the valve seat (1). A bottom bracket (4) is arranged at the bottom of the valve seat (1). A valve shaft is arranged inside the top bracket (2), the valve seat (1) and the bottom bracket (4). The top of the valve shaft is connected to the rotating handle (3). A sealing ring (6) is arranged on the inner diameter surface of the valve seat (1). A butterfly plate (5) is arranged on the inner diameter surface of the sealing ring (6). The butterfly plate (5) is located on the surface of the valve shaft. A U-shaped tube (9) is arranged at the center of the outer surface of the valve seat (1), and the two ends of the U-shaped tube (9) are respectively located on both sides of the outer surface of the valve seat (1). A first through hole is provided at the connection between the valve seat (1) and the two ends of the U-shaped tube (9), and a second through hole is provided at the corresponding position of the sealing ring (6) and the first through hole. The front sides of the two second through holes are provided with sealing members (7), and the center of the back side of the sealing member (7) is provided with a connecting rod (8), and the other end of the connecting rod (8) is connected to the butterfly plate (5).

2. A pressure relief butterfly valve according to claim 1, characterized in that: The connecting rod (8) is made of rubber.

3. A pressure relief butterfly valve according to claim 1, characterized in that: The diameter of the sealing member (7) is greater than the diameter of the second through hole.

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