A high temperature, high pressure and high wear resistance bidirectional hard seal floating ball valve

Abstract

The present invention discloses a high-temperature, high-pressure and high-wear-resistant bidirectional hard-sealed floating ball valve, comprising a valve body, a valve cover, a ball, a fixed valve seat and a floating valve seat; the valve body and the valve cover are threadedly connected by bolts and nuts; a fixed valve seat is arranged at one end of the valve cover; a floating valve seat is arranged at one side of the valve body, and a ball is arranged between the floating valve seat and the fixed valve seat; a limiting gap is arranged between the floating valve seat and the valve body; the technical effect of the present invention lies in that a limiting gap is arranged between the floating valve seat and the valve body, and a limiting step is arranged on the valve body, which solves the problem of damage to the sealing ring during the movement of the floating valve seat and effectively solves the technical problem of reverse sealing at the inlet end, which is often caused by the sealing ring being damaged by the floating valve seat, resulting in poor effect and often causing leakage.

Description

Technical Field

[0001] The invention relates to a floating ball valve, in particular to a high-temperature, high-pressure and high-wear-resistant bidirectional hard-sealed floating ball valve. Background Art

[0002] In the prior art, generally, high-temperature, high-pressure, and high-wear-resistant hard-sealed floating ball valves are all one-way (outlet end) sealed, as shown in the flow direction indicated by the arrow in the attached figure, and the inlet end is not sealed in the reverse direction or cannot be effectively sealed for a long time; however, under most working conditions, the inlet end needs to be effectively sealed in the reverse direction for a long time, that is, bidirectional sealing; however, in the prior art, the reverse sealing at the inlet end is generally poor in effect because the sealing ring is damaged by the floating valve seat, which often causes leakage. Summary of the invention

[0003] In view of the deficiencies of the above-mentioned prior art, the present invention realizes a high-temperature, high-pressure and high-wear-resistant bidirectional hard-sealed floating ball valve, which is characterized in that it includes a valve body, a valve cover, a ball, a fixed valve seat and a floating valve seat; the valve body and the valve cover are threadedly connected by bolts and nuts; the fixed valve seat is arranged at one end of the valve cover; the floating valve seat is arranged on one side of the valve body, and the ball is arranged between the floating valve seat and the fixed valve seat; a limiting gap is arranged between the floating valve seat and the valve body.

[0004] Furthermore, the limiting gap is between 2.1 mm and 5.2 mm.

[0005] Furthermore, a limiting step is provided between the floating valve seat and the valve body; a first sealing ring is provided on the outer side of the floating valve seat, a pressure ring is provided on the outer side of the first sealing ring, and a first disc spring is provided between the pressure ring and the floating valve seat.

[0006] Furthermore, a longitudinal groove is provided above the sphere, one end of the valve stem is inserted into the longitudinal groove, a wear-resistant pad is provided between the valve stem and the valve body, a groove is provided on the valve stem above the wear-resistant pad, an O-ring is embedded in the groove; a packing is provided between the valve stem above the O-ring and the valve body, a packing sleeve is provided above the packing, a second disc spring is provided above the packing sleeve; a packing pressure plate is provided above the second disc spring; the packing pressure plate and the valve body are fixed by bolts and nuts; a square block is provided on the other end of the valve stem, and a handle is installed on the square block by clamping with a hexagon socket bolt.

[0007] Furthermore, a second sealing ring is arranged between the valve body and the fixed valve seat.

[0008] Furthermore, the material of the second sealing ring is flexible graphite.

[0009] Furthermore, the material of the first sealing ring is flexible graphite.

[0010] The technical effect of the present invention is that a limit gap is set between the floating valve seat and the valve body, and a limit step is set on the valve body, so as to solve the problem of damage to the sealing ring during the movement of the floating valve seat and effectively solve the technical problem of reverse sealing at the inlet end, which is often caused by the sealing ring being damaged by the floating valve seat, resulting in poor effect and often causing leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a full cutaway schematic diagram of the present invention.

[0012] Figure 2 It is a top view of the packing press plate and handle of the present invention.

[0013] Figure 3 It is an enlarged view of point A of the present invention. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] Combined with Figure 1 As shown, the present invention provides a high-temperature, high-pressure, high-wear-resistant, bidirectional hard-sealed floating ball valve, including a valve body 4, a valve cover 5, a ball 6, a fixed valve seat 7, and a floating valve seat 8; the valve body 4 and the valve cover 5 are threadedly connected by bolts 1 and nuts 2; a fixed valve seat 7 is arranged at one end of the valve cover 5; a floating valve seat 8 is arranged at one side of the valve body 4, and a ball 6 is arranged between the floating valve seat 8 and the fixed valve seat 7; a limiting gap is arranged between the floating valve seat 8 and the valve body 4. In the working process of the present invention, a limiting gap is arranged between the floating valve seat 8 and the valve body 4, and a limiting step is arranged on the valve body 4, which solves the problem of damage to the sealing ring during the movement of the floating valve seat 8, and effectively solves the technical problem of reverse sealing at the inlet end, which is often caused by the sealing ring being damaged by the floating valve seat, resulting in poor effect and leakage.

[0016] Combined with Figure 1 and attached Figure 2As shown, a limiting step 41 is provided between the floating valve seat 8 and the valve body 4; a first sealing ring 23 is provided on the outside of the floating valve seat 8, a pressure ring 24 is provided on the outside of the first sealing ring 23, and a first disc spring 25 is provided between the pressure ring 24 and the floating valve seat 8. In this embodiment, when the medium flows in the direction of the arrow (from the inlet end to the outlet end), when the valve is closed, the ball 6 pushes the fixed valve seat 7 (at the outlet end) under the action of the medium force and the pre-tightening force of the disc spring 25, and presses the second sealing ring 22, so that the ball 6 and the fixed valve seat 7 are sealed, and the fixed valve seat 7 and the valve body 4 are sealed, the medium is cut off, and the valve is closed. When the medium flows in the opposite direction of the arrow (from the outlet to the inlet), and the valve is closed, the ball 6 pushes the floating valve seat 8 (at the inlet end) under the action of the medium force and the preload force of the disc spring 25, pushes the first disc spring 25, pushes the pressure ring 24, and pushes the first sealing ring 23, so that the ball 6 and the floating valve seat 8 are sealed, and the floating valve seat 8 and the valve body 4 are sealed, and the medium is cut off, and the valve is closed; but under high pressure greater than or equal to CLASS600 pounds, the first sealing ring 23 is squeezed out or loses its elasticity and cannot be sealed, and the medium cannot be cut off, and the valve cannot be closed. Therefore, a limiting step 41 is designed on the valve body 4, and a given limiting gap is designed between the valve body 4 and the floating valve seat 8. When the floating valve seat 8 moves a given gap stroke, it will no longer move, and the first sealing ring 23 will not be squeezed out, thereby ensuring that the inlet end can be effectively sealed for a long time under high pressure. This limiting gap is the key, and it must be within an appropriate range, neither too large nor too small, otherwise, it will not be (or long-term effective) sealed. After repeated tests, it was found that when the limit gap is between 2.1 mm and 5.2 mm, the sealing effect is optimal and the probability of damage to the first sealing ring 23 is minimal.

[0017] In order to achieve the sealing of the entire valve and the application of the valve, combined with the attached Figure 1 , Attachment Figure 3 As shown, a longitudinal groove is provided above the sphere 6, one end of the valve stem 11 is inserted into the longitudinal groove, a wear-resistant pad 9 is provided between the valve stem 11 and the valve body 4, a groove is provided on the valve stem 11 above the wear-resistant pad 9, and an O-ring 10 is embedded in the groove; a packing 12 is provided between the valve stem 11 and the valve body 4 above the O-ring 10, a packing gland 13 is provided above the packing 12, and a second disc spring 14 is provided above the packing gland 13; a packing pressure plate 15 is provided above the second disc spring 14; the packing pressure plate 15 and the valve body 4 are fixed by bolts 1 and nuts 2; a square block is provided on the other end of the valve stem 11, and a handle 19 is clamped and installed on the square block by a hexagon socket bolt 18, and in order to achieve sealing between the valve body 4 and the fixed valve seat 7, a second sealing ring 22 is provided between the valve body 4 and the fixed valve seat 7. In order to ensure the sealing effect and the sealing of the floating valve seat 8 during movement, the first sealing ring 23 and the second sealing ring 22 are made of flexible graphite.

[0018] As a preferred embodiment of the present invention, it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention, which is also the protection scope of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0019] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high temperature, high pressure and high wear resistance bidirectional hard seal floating ball valve, characterized in that: It includes a valve body, a valve cover, a ball, a fixed valve seat and a floating valve seat; the valve body and the valve cover are threadedly connected by bolts and nuts; the fixed valve seat is arranged at one end of the valve cover; the floating valve seat is arranged at one side of the valve body, and the ball is arranged between the floating valve seat and the fixed valve seat; a limiting gap is arranged between the floating valve seat and the valve body; A limiting step is provided between the floating valve seat and the valve body; a first sealing ring is provided on the outer side of the floating valve seat, a pressure ring is provided on the outer side of the first sealing ring, and a first disc spring is provided between the pressure ring and the floating valve seat; A longitudinal groove is provided above the sphere, one end of the valve stem is inserted into the longitudinal groove, a wear-resistant pad is provided between the valve stem and the valve body, a groove is provided on the valve stem above the wear-resistant pad, an O-ring is embedded in the groove; a packing is provided between the valve stem above the O-ring and the valve body, a packing gland is provided above the packing, a second disc spring is provided above the packing gland; a packing pressure plate is provided above the second disc spring; the packing pressure plate and the valve body are fixed by bolts and nuts; a square block is provided on the other end of the valve stem, and a handle is installed on the square block by clamping with a hexagon socket bolt; The limiting gap is between 2.1 mm and 5.2 mm.

2. A high-temperature, high-pressure, high-wear-resistant, bidirectional hard-sealed floating ball valve as claimed in claim 1, characterized in that: A second sealing ring is arranged between the valve body and the fixed valve seat.

3. A high-temperature, high-pressure, high-wear-resistant, bidirectional hard-sealed floating ball valve as claimed in claim 2, characterized in that: The material of the second sealing ring is flexible graphite.

4. A high-temperature, high-pressure, high-wear-resistant, bidirectional hard-sealed floating ball valve as claimed in claim 1, characterized in that: The material of the first sealing ring is flexible graphite.

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