CN217272059U

CN217272059U - Multi-thread sealing valve seat for ball valve

Info

Publication number: CN217272059U
Application number: CN202220543019.0U
Authority: CN
Inventors: 李中华; 彭秀成; 王锐
Original assignee: Youlixima Marine Equipment Chengdu Co ltd
Current assignee: Youlixima Marine Equipment Chengdu Co ltd
Priority date: 2022-03-14
Filing date: 2022-03-14
Publication date: 2022-08-23
Anticipated expiration: 2032-03-14

Abstract

The utility model relates to a ball valve is with multi-thread sealed disk seat, its characterized in that: the ball valve comprises a valve seat, a valve body and a ball body, wherein the ball body is movably arranged in the valve body, the valve seat is arranged between the ball body and the valve body, the contact surface of the valve seat and the ball body is a valve seat root sealing surface, the cross section of the valve seat root sealing surface is wavy, and the contact point of the valve seat root sealing surface and the surface of the ball body is arc-shaped. The utility model discloses be the wave with the face design of disk seat and spheroid contact, be circular-arc with the spheroid contact line, it is low with spheroid friction loss, and can store more elastic energy of material itself, the disk seat uses the wearing and tearing volume low, effectively improves disk seat life, has reduced the probability that liquid takes place to leak.

Description

Multi-thread sealing valve seat for ball valve

Technical Field

The utility model relates to the technical field of valves, especially, relate to a ball valve is with multi-thread sealed disk seat.

Background

Ball valve, the open-close piece (ball) is driven by the valve rod and rotates around the axis of the ball valve. To prevent leakage between the ball of the ball valve and the valve body, the valve seat is used as a seal to close the gap. The existing valve seat generally adopts a lip-type valve seat sealing structure, which is also called as a lip-seal technology (lip-seal) with flexibility, as shown in fig. 2, the structure of the existing lip-type valve seat is a structure of the existing lip-type valve seat, and the structure has a special shape and has 4 contact points, wherein a point Y is a sealing point contacted with a ball body, a point X is a sealing point contacted with a valve body, a point W is a supporting point contacted with the ball body, and a point Z is a supporting point contacted with the valve body. The change in shape of the lips before and after assembly stores the elastic shape of the material, like a spring. And when the temperature or the pressure is increased, the elastic deformation energy is further absorbed, and when the temperature or the pressure is decreased, the elastic deformation energy is released to obtain the memory characteristic. However, this valve seat has a problem that when it is used in a ball valve having a pressure of more than 10MPa, the two line seals at Y and W are easily worn by the influence of the increase in pressure because the contact between the point Y and the point W and the ball is sharp and curved, and thus the valve seat is worn too quickly. Thereby producing leakage and reducing the useful life of the valve seat.

SUMMERY OF THE UTILITY MODEL

Therefore, the multi-line sealing valve seat for the ball valve needs to be provided aiming at the conditions that the valve seat for the existing ball valve is worn too fast and has short service life.

The utility model provides a ball valve is with multi-thread sealed disk seat, includes disk seat, valve body and spheroid, spheroid movable mounting be in the valve body, the disk seat sets up the spheroid with between the valve body, the disk seat with spheroidal contact surface is the disk seat root sealing face, the cross section of disk seat root sealing face is the wave, the disk seat root sealing face with the contact point on spheroid surface is circular-arc.

Preferably, a first contact point, a second contact point, a third contact point and a fourth contact point are sequentially arranged on the sealing surface of the root of the valve seat, the first contact point and the second contact point are abutted with the ball, and the third contact point and the fourth contact point are movably abutted with the ball.

Preferably, the valve seat and the inner edge corner of the valve body contact are provided with chamfer surfaces.

Preferably, the valve seat is made of polytetrafluoroethylene plastic, reinforced polytetrafluoroethylene, nylon, PEEK, PPL.

The utility model discloses an useful part lies in: the surface of the valve seat, which is in contact with the ball body, is designed into a wave shape, the contact line with the ball body is arc-shaped, the friction loss with the ball body is low, more elastic energy of materials can be stored, the use abrasion loss is low, the service life of the valve seat is effectively prolonged, and the probability of leakage of liquid passing through the ball valve is reduced.

Drawings

FIG. 1 is a schematic structural view of a multi-line sealing valve seat for a ball valve according to an embodiment;

FIG. 2 is a schematic view of a conventional lip-type sealing valve seat;

FIG. 3 is an enlarged view of the portion A of FIG. 1 with the valve seat not fully assembled;

fig. 4 is an enlarged view of a portion a of the valve seat in fig. 1, which is deformed by pressure during assembly.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms different from those described herein and similar modifications may be made by those skilled in the art without departing from the spirit and scope of the invention and, therefore, the invention is not to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, 3 and 4, the multi-thread sealing valve seat for the ball valve comprises a valve seat 1, a valve body 2 and a ball body 3, wherein the ball body 3 is movably installed in the valve body 2, the valve seat 1 is arranged between the ball body 3 and the valve body 2, the contact surface between the valve seat 1 and the ball body 3 is a valve seat root sealing surface 11, the cross section of the valve seat root sealing surface 11 is wavy, and the contact point between the valve seat root sealing surface 11 and the surface of the ball body 3 is arc-shaped. Specifically, it can be understood that the valve seat 1 is annular and is assembled between the ball 3 and the valve body 2 to block the gap between the ball 3 and the valve body 2, so as to prevent the liquid passing through the ball valve from leaking out. In this embodiment, the valve seat 1 is made of teflon plastic, reinforced teflon, nylon, PEEK, or PPL, which have sufficient tensile and compressive strengths and certain elastoplasticity, and are suitable as a sealing material to obtain reliable sealing effect. Further, as shown in fig. 2, in the conventional valve seat 1 for a ball valve, 2 contact points are respectively provided between the valve seat 1 and the valve body 2 and between the valve body 1 and the ball 3, where point B is a sealing point in contact with the ball, point a is a sealing point in contact with the valve body, point C is a supporting point in contact with the ball, and point D is a supporting point in contact with the valve body. It can be understood that the valve seat 1 is circular, therefore, the points B and C are two sealing lines, when the valve seat 1 is used on a ball valve with pressure greater than 10MPa, the sharp corners B and C are easily worn under the influence of increased pressure, because the contact between the points B and C and the ball body is the sharp corner and the cambered surface, the valve seat is worn too fast, and leakage is generated. In order to prolong the service life of the valve seat 1, the applicant designs the valve seat root sealing surface 11 of the valve seat 1 and the ball body 3 into a wave shape, a plurality of contact points which are contacted with the spherical surface of the ball body 3 are arranged on the surface, the cross section of each contact point is arc-shaped, and the parallel line type ring surrounds the spherical surface of the ball body 3 for one circle. The design of the structure enables the contact point on the sealing surface 11 at the root of the valve seat to change in shape before and after assembly, and the elastic shape energy of the material can be stored, and the elastic shape energy is like a spring. And when temperature or pressure rise, further absorb elastic deformation ability, when temperature or pressure fall, the elastic deformation ability of releasing obtains the memory characteristic, is difficult for direct and direct wearing and tearing with spheroid 3 to fall, and then has effectively improved the life of disk seat 1.

As shown in fig. 3 to 4, the valve seat base sealing surface 11 is provided with a first contact point 111, a second contact point 112, a third contact point 113 and a fourth contact point 114 in this order, the first contact point 111 and the second contact point 112 are abutted against the ball 3, and the third contact point 113 and the fourth contact point 114 are movably abutted against the ball 3. Specifically, when the valve seat 1 is not assembled tightly, the first contact point 111 and the second contact point 112 are always in contact with the spherical surface of the ball 3, and are sealing points in contact with the ball 3; after the valve seat 1 is assembled and fastened, the ball 3 extrudes the valve seat 1, the valve seat 1 is subjected to medium thrust generated on one side of the ball 3 and deforms, the third contact point 113 and the fourth contact point 114 are in spherical contact with the ball 3 and exist as supporting points for the ball 3 to contact, the design purpose of supporting and sealing multiple lines is achieved, the wear resistance of the valve seat 1 can be improved, the service life of the valve seat 1 is prolonged, and liquid leakage between the valve seat 1 and the ball 3 is effectively avoided.

As shown in figures 3-4, the inner edge of the valve seat 1 contacting the valve body 2 is provided with a chamfer 12, after the valve seat 1 is extruded and deformed by the ball body 3, the points A and D on the valve seat 1 are extruded by the valve body 2 to form line contact, and the sealing performance is better. And after the valve seat 1 is pressed and deformed, the inclined plane 12 can store the elastic performance of the valve seat 1, and the contact force between the third contact point 113 and the fourth contact point 114 and the ball body 3 is reduced like a spring under the action of force, so that the force for tightly holding the ball body 3 by the valve seat 1 is reduced, the operation moment of the valve is reduced, and the valve is opened and closed more labor-saving.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a ball valve is with multi-thread sealed disk seat which characterized in that: the ball valve comprises a valve seat, a valve body and a ball body, wherein the ball body is movably arranged in the valve body, the valve seat is arranged between the ball body and the valve body, the contact surface of the valve seat and the ball body is a root sealing surface of the valve seat, the cross section of the root sealing surface of the valve seat is wavy, and the contact point of the root sealing surface of the valve seat and the surface of the ball body is arc-shaped.

2. A multi-wire seal seat for a ball valve as defined in claim 1, wherein: the sealing surface of the root of the valve seat is sequentially provided with a first contact point, a second contact point, a third contact point and a fourth contact point, the first contact point and the second contact point are abutted with the ball body, and the third contact point and the fourth contact point are movably abutted with the ball body.

3. A multi-wire seal seat for a ball valve as defined in claim 2, wherein: the valve seat with the interior edge angle department of valve body contact is provided with the scarf.

4. A multi-wire seal seat for a ball valve as defined in claim 1, wherein: the valve seat is made of polytetrafluoroethylene plastic, reinforced polytetrafluoroethylene, nylon, PEEK and PPL.