CN205047893U - Fixed ball valve of integral type facial make -up low temperature - Google Patents

Abstract

The utility model provides an integrated top-mounted low-temperature fixed ball valve, which includes a valve body, a ball placed in the valve body and a lower valve stem, a valve seat is arranged between the ball and the valve body, and an upper cover is fixedly connected to the upper end of the valve body , the upper cover is provided with a valve stem, the sealing surface of the valve body and the valve seat is wedge-shaped, the ball drives the valve seat and the valve body to form a wedge-shaped fit, the upper end of the ball is provided with an elastic member, and the elastic member provides Downward preload of the ball, the stem and lower stem provide a fixed axis for the ball. The utility model changes the structure design of the traditional valve seat, solves the drawbacks of the traditional valve seat assembly, such as numerous parts, low-temperature deformation and unstable seal, and more convenient online maintenance. Compared with the threaded rotary structure, it avoids multiple times The thread is damaged due to installation, which can realize multiple on-site disassembly and assembly; the wedge sealing surface structure of the valve body, the valve seat is wedged between the wedge surface and the spherical surface of the valve body, and the wedge surface principle makes the pre-tightening force larger and the sealing performance better .

Description

One-piece body mounted cryogenic trunnion ball valve

technical field

The utility model belongs to the field of valves, in particular to an integrated top-mounted low-temperature fixed ball valve.

Background technique

With the world's new energy being widely used, the country is also constantly developing and applying it, such as liquefied natural gas, liquid ethylene, liquid oxygen and other low-temperature media. With the increasing demand for these new energy sources, ball valves are used as pipelines in petroleum, chemical, natural gas and other industries. The main equipment of the medium, the ultra-low temperature ball valve is also in great demand immediately.

The ultra-low temperature ball valves used in domestic projects are basically imported, almost monopolized by foreign countries, and the country is also constantly developing. However, the seat structure of the top-mounted ultra-low temperature fixed ball valves seen so far is complicated, difficult to maintain online, and unstable in performance.

The one-piece top-mounted low-temperature fixed ball valve ball currently seen, design positioning holes on the top and bottom of the ball, place bearings in the holes, and then place the upper and lower shafts in the bearing holes to keep the ball stable during rotation, but the actual ball is up and down. The shaft hole has tolerances, and the upper and lower shafts have tolerances; the accumulated tolerances can easily make the center line of the ball's opening and closing rotation not perpendicular to the horizontal line, resulting in easy deformation of the sealing surface and increased torque; There are many parts in the fixed ball valve seat assembly. The seat and the seat hole of the valve body are sealed with graphite or lip seals. Because the outer circle of the valve seat and the size of the seat hole of the valve body change at low temperature and the change of the non-metallic seal is inconsistent , It is easy to cause leakage, which will lead to internal leakage of the valve; the installation method of the ultra-low temperature top-entry fixed ball valve seat seen so far is a threaded rotating structure, which is difficult to rotate and disassembled many times, and the thread is easy to be damaged.

Utility model content

In order to solve the above deficiencies, the utility model provides an integrated top-mounted low-temperature fixed ball valve.

The utility model provides: an integrated top mounted low temperature fixed ball valve, which includes a valve body, a ball and a lower valve stem are placed in the valve body, a valve seat is arranged between the ball and the valve body, and the upper end of the valve body is fixedly connected with an upper Cover, the upper cover is provided with a valve stem, the sealing surface of the valve body and the valve seat is wedge-shaped, the ball drives the valve seat and the valve body to form a wedge-shaped fit, the upper end of the ball is provided with an elastic member, and the elastic member provides The preload that keeps the ball down.

The elastic member is a spring plate, and the spring plate is sheathed on the sphere. The outer upper part of the spring plate is press-fitted with the upper cover, and the inner side of the spring plate is press-fitted with the sphere to form a lever.

The valve seat includes a valve seat support ring arranged on the outer ring and a valve seat lip ring arranged on the inner ring of the valve seat. There is a groove on the inner side of the valve seat, and the valve seat lip ring is arranged in the groove, and is connected with The sealing surface of the valve body is in contact.

The sphere is positioned through the valve stem and the lower valve stem, the valve stem is matched with the upper cover hole, and the lower valve stem is matched with the valve body hole.

The utility model changes the structure design of the traditional valve seat, solves the disadvantages of the traditional valve seat assembly, such as many parts, low-temperature deformation and unstable seal, and more convenient online maintenance. Compared with the threaded rotary structure, it avoids multiple The thread is damaged due to installation, which can be disassembled and assembled multiple times on site; the wedge sealing surface structure of the valve body, the valve seat is wedged tightly between the wedge surface and the spherical surface of the valve body, and the wedge surface principle makes the pre-tightening force larger and the sealing performance better .

Description of drawings

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

FIG. 2 is an enlarged schematic diagram of A in FIG. 1 .

detailed description

Below in conjunction with accompanying drawing, the utility model embodiment is further described:

As shown in Figure 1, the utility model provides an integrated top-mounted low-temperature fixed ball valve, which includes a valve body and a ball placed in the valve body, a valve seat is provided between the ball and the valve body, and the upper end of the valve body is fixedly connected There is an upper cover, the sealing surface 8 in the valve body that matches the valve seat is wedge-shaped, and the ball drives the valve seat to form a wedge-shaped fit with the valve body. The upper end of the ball is provided with an elastic member, and the elastic member provides the downward force of the ball. preload.

The valve body 1 adopts a wedge-shaped sealing surface structure, and the load is provided to the ball 2 through the elastic member, so that the valve seat 3 is wedged between the wedge surface and the spherical surface of the valve body. The principle of the wedge surface makes the pre-tightening force larger and the sealing performance better.

And described elastic member is spring plate 4, and described spring plate 4 is sleeved on the spheroid, and spring plate 4 outside upper part presses fit with loam cake, and described spring plate inner side lower side presses fit with spheroid, constitutes a lever.

The valve seat includes a valve seat support ring arranged on the outer ring and a valve seat lip ring arranged on the inner ring of the valve seat. There is a groove on the inner side of the valve seat, and the valve seat lip ring is arranged in the groove, and is connected with The sealing surface of the valve body is in contact.

As shown in Figure 2, the valve seat support ring 3a is installed on the outer ring of the valve seat 3; the groove is processed on the back end of the valve seat 3, and the valve seat lip ring 3b is installed. The valve seat 3 is placed on the ball 2, and the ball 2 passes through the plate The spring 4 is loaded, and the valve seat 3 is loaded into the valve body 1 under the action of friction with the ball 2, and the load of the leaf spring 4 is also between the groove of the valve seat 3 and the lip ring 3b of the valve seat, and between the valve seat 3 and the ball 2. Provides initial sealing force between. Under the action of the medium at the upstream end, the lip of the valve seat lip ring 3b is pushed, one side of the lip presses the wedge-shaped sealing surface of the valve body 1, and the other side presses the groove end surface of the valve seat 3, thereby forming a seal on the back end surface of the valve seat, After sealing, the valve seat 3 is pressed to the sphere 2, so that the sealing between the valve seat 3 and the sphere 2 is more reliable. When the pressure in the cavity of the valve body 1 exceeds the rated value of the product, the pressure in the cavity makes the lip ring 3b of the valve seat 3 in the groove on the end face of the valve seat 3 close, so that the pressure in the cavity is also released, making the valve safe and reliable.

The sphere is positioned through the valve stem 7 and the lower valve stem 6, the valve stem is matched with the upper cover hole, and the lower valve stem 6 is matched with the valve body hole. The lower end of the ball 2 is placed in the valve body hole of the valve body 1 through the lower valve stem 6, and the upper end of the ball 2 is placed in the upper cover 5 through the valve stem, which can effectively ensure that the center line of the opening and closing rotation of the ball is perpendicular to the horizontal line of the flow channel. The switch is stable, and the force on the valve seat 3 is uniform, so that the valve seal is reliable and the service life is long.

During installation, the traditional threaded rotary structure is changed to a wedge surface insertion structure, which avoids thread damage caused by multiple installations, can realize multiple on-site disassembly and assembly, and is easy to maintain. The specific main scheme is the drive of the ball 2. When the ball 2 is lifted up by the tooling, the valve seat 3 is disassembled together under the action of friction. are installed together under the action of force.

The embodiment should not be regarded as limiting the utility model, but any improvement based on the spirit of the utility model should be within the protection scope of the utility model.

Claims (4)

1. A one-piece top-mounted low-temperature fixed ball valve, which includes a valve body, a sphere and a lower valve stem are placed in the valve body, a valve seat is arranged between the sphere and the valve body, and an upper cover is fixedly connected to the upper end of the valve body. There is a valve stem inside the cover, and it is characterized in that: the sealing surface of the valve body and the valve seat is wedge-shaped, the ball drives the valve seat and the valve body to form a wedge-shaped fit, and the upper end of the ball is provided with an elastic member, and the elastic member Provides preload to keep the ball down. 2. The one-piece top-mounted low-temperature fixed ball valve according to claim 1, wherein the elastic member is a spring plate, and the spring plate is sleeved on the sphere, and the outer upper part of the spring plate is press-fitted with the upper cover. Described spring plate inboard lower side and spheroid press fit, constitute a lever. 3. The one-piece top-mounted low-temperature trunnion ball valve according to claim 1, wherein the valve seat includes a valve seat support ring arranged on the outer ring and a valve seat lip ring arranged on the inner ring of the valve seat, and the inner side of the valve seat There is a groove, and the valve seat lip ring is arranged in the groove and contacts with the sealing surface of the valve body. 4. The one-piece top-mounted low-temperature fixed ball valve according to claim 1, characterized in that, the ball is positioned through the valve stem and the lower valve stem, the valve stem is matched with the upper cover hole, and the lower valve stem and the valve body holes to match.