CN205504053U - Sealed valve holder structure of elasticity of fixed ball valve - Google Patents

Abstract

The utility model relates to an elastic sealing valve seat structure of a fixed ball valve. An inner step is arranged in the valve body near the valve ball side, and the inner step is arranged coaxially with the flow channel of the valve body. An elastic Support body, support ring, packing and valve seat, one end of the elastic support body is against the bottom surface of the inner step, the other end of the elastic support body is against the support ring, the other end of the support ring is against the packing, and the packing is against the valve seat. A spherical groove is provided on the valve seat facing the side of the valve ball, and the O-ring is embedded in the spherical groove, and the O-ring is in contact with the valve ball. The utility model is driven by the elastic compensation force provided by the elastic support body and the medium pressure, and the elastic deformation of the O-ring and the valve ball is forced to form a reliable seal; because one end of the filler adopts an inner conical surface structure, it can The elastic compensation force and medium pressure acting on the support ring by the elastic support body are decomposed laterally, which increases the specific pressure of the seal and makes the seal stable and efficient.

Description

Elastic sealing seat structure of fixed ball valve

technical field

The utility model relates to a valve seat structure of a valve body, in particular to an elastic sealing valve seat structure of a fixed ball valve.

Background technique

The metal seal of the fixed ball valve is commonly known as the hard seal. One side of the sealing pair is a fixed ball made of metal material, and the other side is also a valve seat made of metal material. The elastic force provided by the small compression spring or disc spring arranged between the valve seat and the valve body is applied to the valve seat to realize the tight fit between the valve seat and the valve ball to achieve forced sealing. This kind of metal sealing structure has long service life, good temperature resistance, corrosion resistance and wear resistance, and superior mechanical properties.

In the design and production process of metal-sealed trunnion ball valves, different hardening treatments will be adopted for the sealing surface of the valve ball and seat according to different working conditions. Alloy, spray welding Ni60 nickel-based alloy, spray tungsten carbide, etc. After such hardening treatment on the sealing surface, the service life of the valve sealing pair can be greatly improved, but the process is complicated and the manufacturing cost is high. . Moreover, limited by the accuracy of processing equipment and the customer's requirements for leakage levels, metal-sealed trunnion ball valves usually require paired grinding of the sealing surfaces of the valve ball and valve seat, which requires a lot of manpower and material resources; once the valve reaches a certain service life , It is often necessary to replace the valve ball and the valve seat as a whole during inspection and maintenance, which costs a lot and takes a long period.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies in the prior art and provide an elastic sealing valve seat structure of a fixed ball valve with a simple structure, which can greatly reduce costs and improve production efficiency under the premise of ensuring stable and reliable valve action.

According to the technical solution provided by the utility model, the elastic sealing valve seat structure of the fixed ball valve includes a valve seat, an O-ring, an elastic support body, a support ring, a packing, a valve body and a valve ball; There is an inner step in the valve body, and the inner step is coaxial with the flow channel of the valve body. In the inner step, there are elastic support body, support ring, packing and valve seat. One end of the elastic support body is against the bottom surface of the inner step. , the other end of the elastic support is against the support ring, the other end of the support ring is against the packing, and the packing is against the valve seat. A spherical groove is opened on the valve seat facing the valve ball, and a spherical groove is embedded in the spherical groove. The O-ring is in contact with the valve ball.

The O-ring is made of metal, and the O-ring is a hollow structure.

The filler has an inner conical surface facing the valve seat, and the valve seat has an outer conical surface facing the filler, and the valve seat and the filler are in contact through the inner and outer conical surfaces.

The elastic supporting body 3 is a disc spring.

Compared with the prior art, the utility model has the following advantages:

1. The utility model is driven by the elastic compensation force provided by the elastic support body and the medium pressure, and the elastic deformation of the O-ring is forced to fit the valve ball to form a seal;

2. Since one end of the filler adopts an inner conical surface structure, the utility model can laterally decompose the elastic compensation force and medium pressure of the elastic support acting on the support ring, which improves the sealing specific pressure and makes the sealing stable and efficient.

Description of drawings

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

FIG. 2 is a partially enlarged view of part A in FIG. 1 .

Figure 3 is a schematic structural view of the filler in the present invention.

Fig. 4 is a schematic structural view of the valve seat in the present invention.

detailed description

Below in conjunction with specific embodiment the utility model is further described.

The elastic sealing valve seat structure of the fixed ball valve includes a valve seat 1, an O-ring 2, an elastic support body 3, a support ring 4, a packing 5, a valve body 6 and a valve ball 7; 6 is provided with an inner step, and the inner step is coaxial with the flow channel of the valve body 6. In the inner step, an elastic support body 3, a support ring 4, a packing 5 and a valve seat 1, and one end of the elastic support body 3 are arranged. It is against the bottom surface of the inner step, the other end of the elastic support body 3 is against the support ring 4, the other end of the support ring 4 is against the packing 5, the packing 5 is against the valve seat 1, and the valve seat 1 on the side facing the valve ball 7 A spherical groove is opened on the top, and the O-ring 2 is embedded in the spherical groove, and the O-ring 2 is in contact with the valve ball 7 .

The O-ring 2 is made of metal, and the O-ring 2 is a hollow structure.

The filler 5 has an inner conical surface at the end facing the valve seat 1, and the end of the valve seat 1 facing the filler 5 has an outer conical surface, and the valve seat 1 and the filler 5 are in contact with the inner and outer conical surfaces with equal taper.

The elastic supporting body 3 is a disc spring.

In the present invention, the support ring 4 is arranged between the filler 5 and the elastic support body 3, and converts the elastic compensation force provided by the elastic support body 3 from line contact to surface contact. The elastic supporting body 3 is arranged between the supporting ring 4 and the valve body 6 .

As shown in FIG. 4 , the spherical groove on the outside of the valve seat 1 is provided with a semicircular lip, and the corners are all rounded to facilitate the introduction of the O-ring 2 .

As shown in Figures 1 to 2, the O-ring 2 is embedded in the spherical groove of the valve seat 1 by means of the expansion and compression process and the lip extrusion process.

In the present utility model, the O-ring 2 can be non-self-tightening, inflatable or self-tightening as required. The non-self-tightening O-ring 2 is a hollow closed ring, which is generally suitable for medium and low pressure working conditions; the closed ring of the inflatable O-ring 2 is filled with inert gas, and is generally suitable for high-temperature and high-pressure working conditions; There is a balance hole drilled on one side of the pipe wall of the O-ring 2, and the balance hole faces the direction of the pressure source during installation, which is generally suitable for medium and high pressure working conditions.

The working principle of the utility model is as follows:

When the O-ring 2 is of the non-self-tightening type, it will generate resilience after being compressed, and at the same time, the medium will exert force on the side of the metal hollow O-ring 2 to make it open. Under the action of these two forces, the O-ring The ring 2 is close to the sealing surface of the valve ball 7 to achieve the sealing effect; when the O-ring 2 is inflatable, the pressure inside the ring will increase with the temperature of the medium, and the resilience will also increase continuously. The medium still exerts force on its side, which is helpful for the bonding of the O-ring 2 and the sealing surface of the valve ball 7, and the sealing effect is good; when the O-ring 2 is self-tightening, the medium enters through the balance hole on the pipe wall. In the ring, the internal and external pressure of the O-ring 2 is balanced, and combined with its own resilience and the force of the medium on its side, the sealing effect is the best. In addition, the sealing between the valve seat 1 and the valve body 6 is realized by compressing the packing 5, the packing 5 adopts a multi-piece stacked structure, the packing 5 has an inner conical surface at the end facing the valve seat 1, and the end of the valve seat 1 facing the packing 5 It has an outer conical surface, and the valve seat 1 and the packing 5 are in contact with the inner and outer conical surfaces with equal taper, so that the elastic compensation force and medium pressure of the disc spring 3 acting on the support ring 4 can be decomposed laterally to increase the sealing specific pressure, so that Stable and efficient sealing.

Claims (4)

1. an elastic packing valve seat construction for fixing ball valve, including valve seat (1), O (2), elastic support (3), support ring (4), filler (5), valve body (6) and valve ball (7)；It is characterized in that: in the valve body (6) of close valve ball (7) side, offer interior step, the runner of interior step and valve body (6) is in being coaxially disposed, elastic support (3) it is provided with in this interior step, support ring (4), filler (5) and valve seat (1), one end of elastic support (3) offsets with the bottom surface of interior step, the other end of elastic support (3) offsets with support ring (4), the other end of support ring (4) offsets with filler (5), filler (5) offsets with valve seat (1), spherical groove is being offered on the valve seat (1) of valve ball (7) side, it is embedded with described O (2) at spherical groove, O (2) contacts with described valve ball (7).

2. the elastic packing valve seat construction of fixing ball valve as claimed in claim 1, is characterized in that: described O (2) is metal material, and O (2) is hollow-core construction.

3. the elastic packing valve seat construction of fixing ball valve as claimed in claim 1, is characterized in that: described filler (5) has internal conical surface towards one end of valve seat (1), and valve seat (1) is towards filler (5)

One end there is outer conical surface, valve seat (1) is contacted by the inside and outside circle conical surface that tapering is equal with filler (5).

4. the elastic packing valve seat construction of fixing ball valve as claimed in claim 1, is characterized in that: described elastic support (3) is disk spring.