CN221824485U - A gland type center line soft seal butterfly valve - Google Patents

Abstract

The utility model provides a pressure-covered center-line soft-sealed butterfly valve, which belongs to the technical field of butterfly valves and overcomes the technical defects of valve shaft leakage of existing clamp-type butterfly valves. It includes a valve body, and a valve stem is provided in the valve body for driving the fluid channel at the bottom of the valve body to open or close. It is characterized in that a graphite ring is also provided between the valve body and the valve stem, and the graphite ring is pressed into the valve body by a pressure cover fastened to the upper part of the valve body, and a U-shaped recessed groove is provided at the upper end of the valve body. The shape of the pressure cover matches the U-shaped recessed groove. The utility model product adopts an additional layer of graphite seal on the basis of the original seal, so as to protect the valve stem from water leakage, so that it has more reliable performance and longer service life; it is convenient to install and match; a retaining spring is provided on the valve stem of the product, and gaskets are provided on the upper and lower sides of the retaining spring, and the gasket on the lower side abuts against the countersunk hole step provided in the valve body, which can effectively prevent the valve stem from moving up and down, and further improve the sealing performance.

Description

A gland type center line soft seal butterfly valve

Technical Field

The utility model belongs to the technical field of butterfly valves, in particular to a gland type center line soft sealing butterfly valve.

Background Art

The existing wafer-type butterfly valve adopts the method of dealing with the valve shaft leakage problem by installing an O-ring or other types of sealing rings between the valve shaft and the valve body. Under normal working conditions, this treatment method can solve most valve shaft leakage problems.

However, under special or extreme working conditions such as high temperature and high pressure, the service life of the existing soft seal will be greatly shortened, and the O-ring needs to be replaced regularly. When replacing the O-ring of the existing assembly method of the wafer-type butterfly valve, it is necessary to remove the drive device and then install the O-ring, or remove the valve and then replace the O-ring. The existing method of replacing the O-ring will obviously greatly increase the cost of using the valve and increase unnecessary labor. Therefore, the existing technology has defects and needs to be further improved and perfected.

In the Chinese patent literature, there is a utility patent for a soft-sealed butterfly valve with a gland, with a publication number of CN207229777U. The utility model provides a soft-sealed butterfly valve with a gland, including a valve body, a valve seat, a valve plate, a valve shaft and an upper flange. The valve shaft is assembled on the valve body through an upper copper sleeve and a lower copper sleeve. A primary sealing ring is installed in the upper copper sleeve. A packing cavity is also provided between the valve shaft and the valve body. The packing cavity is located on the upper side of the upper copper sleeve. A secondary sealing ring and a packing gland for squeezing the secondary sealing ring are provided in the packing cavity. The packing gland is assembled on the valve body through a locking bolt and a locking nut. The valve body is provided with a slot for accommodating the packing gland. The soft-sealed butterfly valve described in the utility model has the advantages of long service life of the sealing ring and convenient replacement of the sealing ring.

However, in the above patent, although a stuffing chamber is provided, a sealing ring is also provided in the stuffing chamber, which not only increases the rotational torque of the valve shaft, but also causes leakage if the sealing ring leaks due to quality problems or aging of the rubber seal. The upper and lower installation environments are the same and leakage will occur, which cannot fundamentally solve the technical problem of valve shaft leakage.

Utility Model Content

The purpose of the utility model is to provide a gland type center line soft sealing butterfly valve to solve the above technical problems existing in the prior art.

According to the above purpose, the basic technical scheme of the utility model is: a gland type center line soft seal butterfly valve, including a valve body, the valve body is provided with a valve stem for driving the fluid channel at the bottom of the valve body to open or close, characterized in that: a graphite ring is also provided between the valve body and the valve stem, and the graphite ring is pressed into the valve body by a gland fastened to the upper part of the valve body.

Furthermore, a U-shaped recessed groove is provided at the upper end of the valve body, and the shape of the gland matches the U-shaped recessed groove.

Furthermore, the gland is fastened to the valve body by bolts or screws.

Furthermore, the graphite ring is in the shape of a cylindrical ring and is made of a soft material.

In the above-mentioned gland-type center-line soft-sealed butterfly valve, an O-ring is further arranged between the valve body and the valve stem, and shaft sleeves are arranged above and below the O-ring.

In the above-mentioned gland-type centerline soft-sealed butterfly valve, a valve plate that rotates and seals the valve body is provided on the fluid passage at the lower part of the valve body, and a valve seat is also provided between the valve plate and the valve body.

Furthermore, the valve seat is made of rubber material, and flanges are provided at both ends thereof to match the concave sinks on both sides of the valve body.

In the above-mentioned gland-type center-line soft-sealed butterfly valve, a retaining spring is provided on the valve stem, gaskets are provided on the upper and lower sides of the retaining spring, and the lower gasket abuts against the countersunk step provided in the valve body.

Compared with the prior art, the advantages and beneficial effects of the utility model are:

1. A graphite ring is provided between the valve body and the valve stem of the utility model product. An additional layer of graphite seal is used on the basis of the original seal to protect the valve stem from water leakage, making it more reliable and longer-lasting;

2. The upper end of the valve body of the utility model is provided with a U-shaped sink groove, and the shape of the gland matches the U-shaped sink groove, which is convenient for installation;

3. A retaining spring is provided on the valve stem of the utility model product, and gaskets are provided on the upper and lower sides of the retaining spring. The lower gasket abuts against the countersunk step provided in the valve body, which can effectively prevent the valve stem from moving up and down and further improve the sealing performance.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the three-dimensional structure of the product of the utility model;

FIG2 is a front view of the structure of the utility model product;

FIG3 is a side view of the structure of the product of the utility model;

FIG4 is a schematic diagram of the exploded structure of the utility model product;

FIG5 is a schematic diagram of a front cross-sectional structure of the product of the utility model;

FIG6 is a schematic side cross-sectional view of the utility model product;

In the figure: 1. valve body; 2. valve seat; 3. valve plate; 4. valve stem; 5. gland; 6. graphite ring; 7. gasket; 8. retaining ring; 9. O-ring; 10. sleeve.

DETAILED DESCRIPTION

In conjunction with Figures 1 to 6, a schematic diagram of the principle structure of an embodiment of a gland-type centerline soft-sealed butterfly valve of the utility model is shown. The gland-type centerline soft-sealed butterfly valve comprises a valve body 1, wherein the valve body 1 is provided with a valve stem 4 for driving the fluid passage at the lower part of the valve body 1 to open or close, and a graphite ring 6 is further provided between the valve body 1 and the valve stem 4. The surface of the graphite ring 6 is very smooth and has a small friction coefficient. The graphite ring 6 is pressed against the valve body 1 by a gland 5 fastened to the upper part of the valve body 1; the upper end of the valve body 1 is provided with a valve stem 4 for driving the fluid passage at the lower part of the valve body 1 to open or close, and a graphite ring 6 is further provided between the valve body 1 and the valve stem 4. The surface of the graphite ring 6 is very smooth and has a small friction coefficient. The graphite ring 6 is pressed against the valve body 1 by a gland 5 fastened to the upper part of the valve body 1; A U-shaped recessed groove is provided, and the shape of the gland 5 matches the U-shaped recessed groove, and the gland 5 is fastened to the valve body 1 by bolts or screws; the graphite ring 6 is cylindrical and made of soft material; an O-ring 9 is also provided between the valve body 1 and the valve stem 4, and a shaft sleeve 10 is provided above and below the O-ring 9; a valve plate 3 is provided on the fluid channel at the lower part of the valve body 1 to seal the valve body 1 by rotation, and the valve plate 3 is connected to the valve stem 4, and the valve stem 4 can be rotated The rotary seal is installed in the valve body 1, and a valve seat 2 is also provided between the valve plate 3 and the valve body 1. The valve seat 2 is made of rubber material. When the valve stem 4 rotates, the valve plate 3 is driven to rotate frictionally on the valve seat 2 in the valve body 1. When its entire center surface coincides with the center surface of the valve seat 2, the valve seat 2 is completely sealed. The valve seat 2 has flanges at both ends that match the concave sinks on both sides of the valve body 1; a retaining spring 8 is provided on the valve stem 4, and gaskets 7 are provided on the upper and lower sides of the retaining spring 8. The gasket 7 on the lower side abuts on the countersunk step provided in the valve body 1 to prevent the valve stem 4 from moving downward, and the upper gasket 7 abuts on the bottom of the graphite ring 6 under the gland 5 to prevent the valve stem 4 from moving upward; three graphite rings 6 are provided to keep the upper and lower parts concentric. This graphite ring 6 is a soft material that allows a certain amount of deformation. Through the pressure of the gland 5, the graphite ring 6 will deform, which can seal the gap between the valve stem 4 and the valve body 1 inside and outside.

When the O-ring 9 between the valve body 1 and the valve stem 4 leaks due to insufficient elasticity due to aging, it means that the first seal established below has failed, and the fluid will pass through the retaining ring 8 and flow to the bottom of the graphite ring 6. Since the graphite ring 6 is soft, under the pressure of the pressure cap 5 at its upper end, the graphite ring 6 maintains its internal and external deformation, keeps a close fit with the valve stem 4 and the valve body 1, and seals the leaking fluid from below.

The specific embodiments described herein are merely examples of the spirit of the present invention. A person skilled in the art of the present invention may make various modifications or additions to the specific embodiments described or replace them in a similar manner, but this will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Although this article uses the following terms more frequently: 1. valve body; 2. valve seat; 3. valve plate; 4. valve stem; 5. gland; 6. graphite ring; 7. gasket; 8. retaining ring; 9. O-ring; 10. sleeve, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

The above is an introduction to the gland-type center-line soft-sealed butterfly valve provided by the utility model. In the introduction, specific preferred embodiments are used to illustrate the principles and implementation methods of the utility model. These embodiments are only used to help understand the principles and core ideas of the utility model. It should be pointed out that for ordinary technicians in this field, without departing from the design ideas of the utility model, the implementation plans in the above embodiments can be further combined or replaced, and the utility model can be improved and modified in a number of ways. These improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims (7)

1. The utility model provides a gland formula central line soft seal butterfly valve, includes valve body (1), be equipped with in valve body (1) and drive valve body (1) lower part fluid passage open or valve rod (4) of closing, its characterized in that: a graphite ring (6) is further arranged between the valve body (1) and the valve rod (4), the graphite ring (6) is pressed in the valve body (1) through a gland (5) fastened on the upper portion of the valve body (1), a U-shaped sinking groove is formed in the upper end of the valve body (1), and the shape of the gland (5) is matched with that of the U-shaped sinking groove.

2. The gland type centerline soft seal butterfly valve according to claim 1, wherein: the gland (5) is fastened on the valve body (1) through bolts or screws.

3. The gland type centerline soft seal butterfly valve according to claim 1, wherein: the graphite ring (6) is in a cylindrical ring shape and is made of soft materials.

4. A gland-type center line soft seal butterfly valve according to any one of claims 1 to 3, wherein: an O-shaped ring (9) is further arranged between the valve body (1) and the valve rod (4), and a shaft sleeve (10) is arranged on the O-shaped ring (9) up and down.

5. A gland-type center line soft seal butterfly valve according to any one of claims 1 to 3, wherein: the rotary sealing valve is characterized in that a valve plate (3) for sealing the valve body (1) through rotation is arranged on a fluid channel at the lower part of the valve body (1), and a valve seat (2) is further arranged between the valve plate (3) and the valve body (1).

6. The gland type centerline soft seal butterfly valve according to claim 5, wherein: the valve seat (2) is made of rubber materials, and flanges matched with sinking tables concaved on two sides of the valve body (1) are arranged at two ends of the valve seat.

7. A gland-type center line soft seal butterfly valve according to any one of claims 1 to 3, wherein: the valve rod (4) on be equipped with jump ring (8), jump ring (8) upside be equipped with gasket (7), gasket (7) of downside butt be in on the counter bore step that is equipped with in valve body (1).