CN203146894U - Ball valve - Google Patents

Abstract

The utility model provides a ball valve, comprising: a valve body including a first fluid passage; a valve seat arranged inside the valve body, and the valve seat has a valve port communicating with the first fluid passage; an opening and closing member is located inside the valve body And set with the valve seat; the valve stem, including the shaft shoulder, the first end of the valve stem passes through the valve body and is connected with the opening and closing piece, and the valve stem controls the opening or closing of the valve port of the valve seat by operating the opening and closing piece; the tray, sleeve It is located on the valve stem, on the side of the shaft shoulder away from the opening and closing parts, and is fixedly connected with the valve body; the ball valve also includes an anti-wear structure, and the anti-wear structure is arranged between the shaft shoulder of the valve stem and the tray. According to the ball valve of the utility model, it can effectively prevent the leakage of the ball valve in the closed state caused by the wear between the valve stem and the shaft shoulder or the separation of the valve stem and the opening and closing member.

Description

ball valve

technical field

The utility model relates to the field of valves, in particular to a ball valve.

Background technique

In the pipelines of thermal power units, petroleum refining, chemical industry, metallurgy and other systems under severe working conditions such as high temperature, high pressure, high cycle, thermal shock and scouring, ball valves are commonly used connection, opening and closing devices. . Because it works under severe conditions such as high temperature, high pressure, high cycle, thermal shock and erosion, and a large amount of hydrogen in the medium, the technical requirements for this type of ball valve are particularly strict. Ball valves used in high temperature and high pressure systems are extremely vulnerable to harsh conditions, and if the structure is improper, it is more likely to cause leakage at the seal of the ball valve. Under some harsh working conditions, accidents such as internal opening and closing parts blowing out and valve stem jumping out may occur, resulting in damage to equipment and personal injury to operators.

In order to prevent the valve stem from escaping, the prior art mostly adopts a tray structure. Due to the frequent opening and closing of the valve during long-term use, the rotation of the valve stem will cause wear between the tray and the shoulder of the valve stem. Compared with the tray, it is easy to move axially, and it is easy to make the opening and closing parts not rotate in place, resulting in poor sealing between the sealing surface of the opening and closing parts and the valve seat, causing leakage when the ball valve is closed, and even causing the valve stem to separate from the opening and closing parts .

Utility model content

The utility model aims to provide a ball valve to reduce the wear between the tray and the shoulder of the valve stem when the valve stem rotates, so as to prevent the leakage caused by the wear when the ball valve is closed or the valve stem and the opening and closing parts are separated.

In order to achieve the above object, the utility model provides a ball valve, comprising: a valve body including a first fluid passage; a valve seat arranged inside the valve body, the valve seat has a valve port communicated with the first fluid passage; an opening and closing member , located inside the valve body and set in cooperation with the valve seat; the valve stem, including the shaft shoulder, the first end of the valve stem passes through the valve body and is connected with the opening and closing piece, and the valve stem controls the opening or closing of the valve port of the valve seat by operating the opening and closing piece Close; the tray is sleeved on the valve stem, located on the side of the shaft shoulder away from the opening and closing parts, and is fixedly connected with the valve body; the ball valve also includes an anti-wear structure, and the anti-wear structure is arranged between the shaft shoulder of the valve stem and the tray.

Further, the anti-wear structure includes a bearing arranged between the tray and the valve stem.

Further, the anti-wear structure includes a thrust ball bearing, the first bearing surface of the thrust ball bearing is supported on the shaft shoulder, and the tray is supported on the second bearing surface of the thrust ball bearing.

Further, the ball valve also includes: sealing packing; packing gland, the packing gland is sleeved on the valve stem and compresses the sealing packing between the valve body and the valve stem; wherein, at least one of the valve stem and the packing gland has Surface treatment wear-resistant layer.

Further, the ball valve also includes: a bonnet, the cover is arranged on the valve body, the bonnet includes the second fluid channel, and the opening and closing member is arranged between the valve port of the valve seat and the second fluid channel; the valve body sealing ring seals the valve The gap between the body and the bonnet, the valve body sealing ring has a surface treatment wear-resistant layer.

Further, the packing gland is connected to the valve body through a stud and the first nut, and the ball valve further includes a disc spring, which is sleeved on the stud and located between the packing gland and the first nut.

Further, the ball valve also includes a handle connected to the valve stem and an anti-friction pad, the anti-friction pad is sleeved on the valve stem and is located in a groove on the surface of the tray near the second end of the valve stem, and the anti-friction pad The tab protrudes from the corresponding surface of the tray and abuts against the handle, and the wear-reducing pad has a surface-treated wear-resistant layer.

Further, the surface treatment wear-resistant layer is a salt bath composite treatment layer.

Applying the technical scheme of the utility model, since the ball valve has an anti-wear structure arranged between the shaft shoulder of the valve stem and the tray, during the opening and closing process of the valve, the anti-wear structure can reduce the friction between the tray and the shaft shoulder of the valve stem. Due to wear and tear, the valve stem is not easy to move axially relative to the tray, so it can effectively prevent the leakage caused by the wear when the ball valve is closed or the valve stem is separated from the opening and closing parts.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide a further understanding of the utility model, and the schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute improper limitations to the utility model. In the attached picture:

Fig. 1 shows a sectional view of a front view of a ball valve according to an embodiment of the present invention;

Fig. 2 shows a top view of a ball valve according to an embodiment of the present invention.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in FIG. 1 , the ball valve of this embodiment includes a valve body 1 , an opening and closing member 2 , a valve seat 3 , a valve stem 4 , a tray 5 , and an anti-wear structure 6 arranged between the valve stem 4 and the tray 5 .

A shaft shoulder 41 is provided on the valve stem 4 , and the tray 5 is sheathed on the valve stem 4 and fixedly connected with the valve body 1 through the screw 15 installed in the column 14 . The anti-wear structure 6 preferably comprises a bearing. In this embodiment, the anti-wear structure 6 is a thrust ball bearing 61 , the first bearing surface of the thrust ball bearing is supported on the shaft shoulder 41 , and the tray 5 is supported on the second bearing surface of the thrust ball bearing. The bearing 61 has good wear resistance and can reduce the wear between the tray 5 and the shoulder 41 of the valve stem 4 .

The valve body 1 is provided with a first fluid channel. The valve seat 3 is disposed inside the valve body 1 and has a valve port communicating with the first fluid passage. The opening and closing member 2 is located inside the valve body 1 and arranged in cooperation with the valve seat 3 . The first end of the valve stem 4 passes through the valve body 1 and is connected to the opening and closing member 2. The valve stem 4 controls the opening or closing of the valve port of the valve seat 3 by operating the opening and closing member 2, thereby controlling the opening and closing of the ball valve. In this embodiment, the opening and closing member is a sphere with a middle fluid channel.

In this embodiment, the ball valve further includes a valve seat spring 20 disposed inside the valve body 1 . The valve seat spring 20 is located between the valve body 1 and the valve seat 3 and includes a through hole communicating with the first fluid channel and the valve port. The effect of the valve seat spring 20 is to make the ball fit closely with the valve seat 3 .

As shown in Figures 1 and 2, the ball valve also includes a sealing packing 9, a packing gland 10, a disc spring 11, a stud 13, a first nut 12, a valve cover 7 that is set on the valve body 1, and is used for sealing. Valve body sealing ring 8 in the gap between valve body 1 and valve cover 7 . Wherein, the valve cover 7 includes a second fluid channel. The opening and closing member 2 is arranged between the valve port of the valve seat and the second fluid passage. In this embodiment, the packing gland 10 is sleeved on the valve stem 4 and compresses the sealing packing 9 between the valve body 1 and the valve stem 4 . The packing gland 10 is fixed on the valve body 1 through cooperation among the disc spring 11 , the stud 13 and the first nut 12 . Since the disc spring 11 itself has elastic force when deformed, it can continuously compress the sealing packing 9 , the above arrangement can better realize the function of sealing the gap between the valve body 1 and the valve stem 4 .

The second end of the valve rod 4 passes through the tray 5 and is fixedly connected to the handle 16 through the washer 18 and the second nut 19 .

As shown in FIG. 1 , in this embodiment, the ball valve also includes a wear-reducing gasket 17 . The wear-reducing gasket 17 is sleeved on the valve stem 4 and located in a groove on the surface of the tray 5 near the second end of the valve stem 4 . The wear-reducing gasket 17 protrudes from the corresponding surface of the tray 5 and abuts against the handle 16 .

As shown in Figure 1, when the middle fluid passage of the ball, the valve port of the valve seat 3 and the first fluid passage of the valve body 1 communicate with the second fluid passage of the valve cover 7 and are in a straight line, the ball valve is in a fully open state; The handle 16 can drive the valve stem 4 to rotate. After rotating the handle 90°, the ball is controlled by the valve stem 4 to rotate 90°. At this time, the sealing surface of the sphere is in contact with the valve seat 3 and the valve cover 7 respectively, and the ball valve is in a closed state.

In this embodiment, the valve stem 4, the packing gland 10, the valve body sealing ring 8 and the wear-reducing gasket 17 have a surface-treated wear-resistant layer. Preferably, the surface-treated wear-resistant layer is a salt-bath composite (Quench-Polish-Quench, QPQ) treatment layer. The valve stem 4, packing gland 10, and valve body sealing ring 8 with salt bath composite treatment layer have enhanced wear resistance and corrosion resistance, and ensure the Zero leakage of the valve. After the anti-friction gasket 17 is added with a salt-bath composite treatment layer, the wear resistance is enhanced, and the wear between the tray 5 and the handle 16 can be further reduced.

It can be seen from the above description that the embodiment of the utility model has achieved the following technical effects: since the thrust ball bearing is arranged between the valve stem 4 and the tray 5, the wear resistance is good, and the valve can be opened and closed during the process of valve opening and closing. Effectively prevent wear between the tray 5 and the shaft shoulder 41 of the valve stem 4, the valve stem 4 is less likely to move axially relative to the tray 5, and when the ball valve is closed, after the handle 16 is rotated, the valve stem 4 rotates to drive the opening and closing member 2 to rotate to Proper position, so that the sealing surface of the opening and closing part 2 and the valve seat are accurately matched, and the seal is tight, thereby preventing the ball valve from leaking.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (8)

1. ball valve comprises:

Valve body (1) comprises the first fluid passage;

Valve seat (3) is arranged at described valve body (1) inside, and described valve seat (3) has the valve port with described first fluid channel connection;

Open-shut device (2), it is inner and be equipped with described valve seat (3) to be positioned at described valve body (1);

Valve rod (4) comprises the shaft shoulder (41), and first end of described valve rod (4) passes described valve body (1) and is connected with described open-shut device (2), and the described valve port that described valve rod (4) is controlled described valve seat (3) by the described open-shut device of operation (2) opens or closes;

Pallet (5) is sheathed on described valve rod (4), is positioned at fixedlying connected away from a side of described open-shut device (2) and with described valve body (1) of the described shaft shoulder (41);

It is characterized in that,

Described ball valve also comprises anti-wear structure (6), and described anti-wear structure (6) is arranged between the shaft shoulder (41) and described pallet (5) of described valve rod (4).

2. ball valve according to claim 1 is characterized in that, described anti-wear structure (6) comprises the bearing that is arranged between described pallet (5) and the described valve rod (4).

3. ball valve according to claim 2, it is characterized in that, described anti-wear structure (6) comprises thrust ball bearing, and first bearing surface of described thrust ball bearing is supported on the described shaft shoulder (41), and described pallet (5) is supported in second bearing surface of described thrust ball bearing.

4. ball valve according to claim 1 is characterized in that, described ball valve also comprises:

Stuffing box packing (9);

Gland (10), described Gland (10) are sheathed on described valve rod (4) and described stuffing box packing (9) are pressed between described valve body (1) and the described valve rod (4);

Wherein, at least one in described valve rod (4) and the described Gland (10) has the surface treatment wearing layer.

5. ball valve according to claim 1 is characterized in that, described ball valve also comprises:

Valve gap (7) is covered on the described valve body (1), and described valve gap comprises second fluid passage, and described open-shut device (2) is arranged between the valve port and described second fluid passage of described valve seat (3);

Valve seal ring (8) seals the gap between described valve body (1) and the described valve gap (7), and described valve seal ring (8) has the surface treatment wearing layer.

6. ball valve according to claim 4, it is characterized in that, described Gland (10) is connected with described valve body (1) with first nut (12) by double-screw bolt (13), described ball valve also comprises belleville spring (11), and described belleville spring (11) is sheathed on described double-screw bolt (13) upward and is positioned between described Gland (10) and described first nut (12).

7. ball valve according to claim 1, it is characterized in that, described ball valve also comprises handle (16) and the anti-attrition pad (17) that is connected with described valve rod (4), described anti-attrition pad (17) is sheathed on the groove of second end, one side surface that the close described valve rod (4) of described pallet (5) was gone up and be positioned to described valve rod (4), the respective surfaces of the outstanding described pallet (5) of described anti-attrition pad (17) and with described handle (16) butt, described anti-attrition pad (17) has the surface treatment wearing layer.

8. according to each described ball valve in the claim 4 to 7, it is characterized in that described surface treatment wearing layer is salt bath compounding layer.

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