CN205064864U - Eccentric metal of two -way four -dimension butterfly valve sealed firmly - Google Patents

Abstract

The utility model is specifically a two-way four-dimensional eccentric metal hard-sealed butterfly valve, which solves the problem that the existing eccentric butterfly valve has poor reverse pressure bearing effect and is prone to seal leakage due to unreasonable structural design. The valve body, valve seat sealing ring, composite sealing ring, butterfly plate, valve stem and pressure plate are all inclined. The inner surface of the valve seat sealing ring is a conical structure at an angle of α, and the outer surface of the composite sealing ring is sealed with the valve seat. The inner surface of the ring is closely matched, there is an eccentricity between the center of the valve stem and the radial direction of the valve body passage, the eccentricity between the centerline of the valve stem and the seat seal ring in the direction of the centerline of the valve body, and the centerline of the seat seal ring and the valve body There is an eccentric angle between the center lines, and there is an eccentric angle between the center line of the valve seat sealing ring and the radial direction of the valve body. The utility model ensures that whether the valve is subjected to forward pressure test or reverse pressure test, the butterfly plate has the function of closing tighter and tighter, ensures the sealing specific pressure required by the valve, and makes the sealing performance good.

Description

Two-way four-dimensional eccentric metal hard seal butterfly valve

technical field

The utility model relates to a butterfly valve, in particular to a two-way four-dimensional eccentric metal hard seal butterfly valve.

Background technique

Butterfly valves are widely used in various working conditions because of their simple structure and flexible opening and closing. As a device to cut off and regulate the flow of media, especially in the transformation of pipe networks in water conservancy, electric power, petroleum and other industries, it is required that the valve must be able to withstand two-way pressure. Ensure the normal operation of pipeline equipment.

Whether the existing butterfly valve is a double eccentric butterfly valve or a triple eccentric butterfly valve, the one-way pressure bearing effect is good, but the reverse pressure bearing effect is poor. However, due to the influence of the manufacturing process and processing accuracy, the sealing of the valve is completely realized by over-closing. When the valve is pressed forward, the side with a larger angle has the function of closing and tightening. The sealing effect is good. During the reverse pressure test, the side with a smaller angle has the function of closing and loosening, and the side with a smaller angle will have a seal leakage.

Contents of the invention

The utility model provides a two-way four-dimensional eccentric metal hard-sealed butterfly valve in order to solve the problem that the existing eccentric butterfly valve has a poor reverse pressure bearing effect and is prone to seal leakage due to unreasonable structural design.

The utility model is realized by adopting the following technical scheme: a two-way four-dimensional eccentric metal hard seal butterfly valve, including a valve body, a valve seat seal ring, a composite seal ring, a butterfly plate, a valve stem and a pressure plate, a valve body, a valve seat seal ring, a composite seal The valve ring, butterfly plate, valve stem and pressure plate are all inclined. The inner surface of the valve seat sealing ring is a conical surface structure at an angle of α, and the outer surface of the composite sealing ring is closely matched with the inner surface of the valve seat sealing ring. The center of the valve stem There is an eccentricity in the radial direction of the valve body channel, and there is an eccentricity between the centerline of the valve stem and the sealing ring of the valve seat in the direction of the centerline of the valve body. There is an eccentric angle between the centerline of the seat sealing ring and the centerline of the valve body. There is an eccentric angle between the center line of the sealing ring and the radial direction of the valve body.

When the valve is closed, when the medium pressure is added from the positive direction, the butterfly plate and the composite sealing ring will be pressed in the direction of the small angle of the valve seat sealing ring to make the valve tighter and tighter to prevent leakage of the sealing surface; when the medium pressure is added from the reverse direction At the same time, the butterfly plate and the composite sealing ring are pressed in the direction of the small angle of the valve seat sealing ring, so that the valve is closed tighter and tighter, preventing leakage of the sealing surface, achieving a two-way pressure-bearing seal without leakage, and overcoming the unreasonable structural design of the existing eccentric butterfly valve. There is a problem that the reverse pressure bearing effect is poor and the seal leakage phenomenon is easy to occur.

The α angle of the valve seat sealing ring is 15-30 degrees, and the eccentricity angle between the center line of the valve seat sealing ring and the radial direction of the valve body channel is less than 10 degrees, which further improves the sealing effect of the valve.

The structure design of the utility model is reasonable and reliable. On the basis of the three-dimensional eccentric structure, an eccentric angle between the valve seat and the diameter of the valve body is added to ensure that the butterfly plate has the function of over-closing no matter whether the valve is tested in the forward direction or in the reverse direction. The tighter the function, the higher the sealing specific pressure required by the valve is guaranteed, so that the sealing performance is good.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1-valve body, 2-seat sealing ring, 3-composite sealing ring, 4-butterfly plate, 5-valve stem, 6-press plate.

detailed description

Two-way four-dimensional eccentric metal hard seal butterfly valve, including valve body 1, valve seat sealing ring 2, composite sealing ring 3, butterfly plate 4, valve stem 5 and pressure plate 6, valve body 1, valve seat sealing ring 2, composite sealing ring 3, The butterfly plate 4, the valve stem 5 and the pressure plate 6 are all inclined. The inner surface of the valve seat seal ring 2 is a conical surface structure at an angle of α, and the outer surface of the composite seal ring 3 is closely matched with the inner surface of the valve seat seal ring 2. , there is an eccentricity between the center of the valve stem 5 and the channel of the valve body 1 in the radial direction. There is an eccentric angle between the centerlines, and there is an eccentric angle between the centerline of the valve seat sealing ring 2 and the radial direction of the valve body 1 .

The α angle of the valve seat sealing ring 2 is 15-30 degrees, and the eccentricity angle between the center line of the valve seat sealing ring 2 and the radial direction of the valve body 1 channel is less than 10 degrees.

Claims (2)

1. A two-way four-dimensional eccentric metal hard-sealed butterfly valve, including a valve body (1), a valve seat sealing ring (2), a composite sealing ring (3), a butterfly plate (4), a valve stem (5) and a pressure plate (6) , characterized in that: the valve body (1), valve seat sealing ring (2), compound sealing ring (3), butterfly plate (4), valve stem (5) and pressure plate (6) are all inclined, and the valve seat sealing ring The inner surface of (2) is a conical structure at an angle of α, and the outer surface of the composite sealing ring (3) is closely matched with the inner surface of the valve seat sealing ring (2), and the center of the valve stem (5) is in contact with the valve body (1 ) The channel has an eccentricity in the radial direction, and the centerline of the valve stem (5) and the seat sealing ring (2) has an eccentricity in the direction of the centerline of the valve body, and the centerline of the valve seat sealing ring (2) and the valve body (1) There is an eccentric angle between the center lines, and there is an eccentric angle between the center line of the valve seat sealing ring (2) and the valve body (1) through the radial direction. 2. The two-way four-dimensional eccentric metal hard-sealed butterfly valve according to claim 1, characterized in that: the α angle of the valve seat sealing ring (2) is 15-30 degrees, and the centerline of the valve seat sealing ring (2) is in line with the valve body ( 1) There is an eccentric angle of less than 10 degrees in the radial direction of the channel.