Hard sealing valve seat structure

Abstract

The utility model relates to a hard sealing valve seat structure which comprises a ball body (10), a valve seat (9) and a valve body (1) which are connected in sequence, and further comprises a first pre-tightening assembly arranged between the valve seat (9) and the valve body (1), and a second pre-tightening assembly arranged between the valve seat (9) and the valve body (1), the second pre-tightening assembly and the sealing assembly are arranged between the ball body (10) and the valve body (1), and the second pre-tightening assembly is arranged on the side facing the ball body (10); the sealing assembly comprises a sealing pressing ring (4), a first sealing ring (3) and a second sealing ring (2) which are sequentially stacked, and the sealing pressing ring (4) is arranged on the side facing the second pre-tightening assembly. Compared with the prior art, the valve seat and the sealing face of the ball body are pre-tightened through the first pre-tightening assembly, so that low-pressure sealing is achieved; and under the combined action of the second pre-tightening assembly and the sealing assembly, the hard sealing valve seat structure becomes a whole, sealing of the sealing ring can be achieved, and meanwhile effective dustproof sealing can be conducted on powder in the flow channel.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to a hard sealing valve seat structure. Background Art

[0002] A ball valve is a valve that controls the flow of fluid by rotating the ball. A ball valve usually uses a ball as the closing piece inside the valve body, and a circular hole is provided on the ball. When the hole is aligned with the axis of the pipe, the valve is in the open state; when the ball rotates so that the hole is perpendicular to the axis of the pipe, the valve is in the closed state.

[0003] Ball valves can be divided into three categories according to their structure: floating ball valves, fixed ball valves and elastic ball valves. Among them, the ball of the fixed ball valve is fixed and will not move after being pressurized. It can withstand the erosion of the medium well during the opening and closing process, so it is widely used in the field of fixed particles and abrasive media. Existing fixed ball valves all have floating valve seats. After being subjected to medium pressure, the valve seat moves to press the sealing ring tightly against the ball to ensure sealing. However, it is difficult to stably ensure the reliability and effectiveness of the seal by relying solely on medium pressure, especially in a low-pressure working environment, which will directly affect the reliability and stability of the ball valve. Utility Model Content

[0004] The purpose of the utility model is to provide a hard sealing valve seat structure in order to overcome at least one of the defects in the above-mentioned prior art.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A hard-sealed valve seat structure comprises a ball, a valve seat and a valve body connected in sequence, and also comprises: a first pre-tightening assembly arranged between the valve seat and the valve body; a second pre-tightening assembly and a sealing assembly arranged between the ball and the valve body, wherein the second pre-tightening assembly is arranged on the side facing the ball; the sealing assembly comprises a sealing pressure ring, a first sealing ring and a second sealing ring superimposed in sequence, wherein the sealing pressure ring is arranged on the side facing the second pre-tightening assembly.

[0007] Furthermore, the first pre-tightening assembly includes a plurality of pre-stressing parts, and the plurality of pre-stressing parts are evenly distributed along the circumferential direction on the end surface of the valve seat facing the valve body.

[0008] Furthermore, the pre-pressed piece is embedded in the end surface of the valve seat facing the valve body.

[0009] Furthermore, the pre-pressed member is a spring.

[0010] Furthermore, the second pre-tightening assembly includes a compression sleeve sleeved on the valve seat, and a plurality of screws threadedly connected to the compression sleeve.

[0011] Furthermore, four open rings are arranged between the head end of the screw and the valve body.

[0012] Furthermore, a side of the four-open ring facing away from the screw head end is embedded in the valve body.

[0013] Furthermore, the screw is a hexagon socket screw.

[0014] Furthermore, a gasket is provided at the position where the ball and the valve seat abut against each other.

[0015] Furthermore, the valve body comprises an inlet valve body and an outlet valve body, and the inlet valve body and the outlet valve body together form a valve cavity; the hard sealing valve seat structure is respectively arranged at the inlet and outlet of the valve cavity.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] (1) The utility model provides a hard-sealed valve seat structure, which realizes pre-tightening of the valve seat and the ball sealing surface through a first pre-tightening component to achieve low-pressure sealing; and then through the joint action of the second pre-tightening component and the sealing component, the hard-sealed valve seat structure becomes a whole, which can realize the sealing of the sealing ring and effectively seal the powder in the flow channel against dust.

[0018] (2) The utility model provides a hard-sealed valve seat structure, wherein a first sealing ring, a second sealing ring, a spring, a support ring, a valve seat, a sealing pressure ring, four open rings and screws form a sealing assembly, wherein the support ring is compressed by the screws to achieve sealing between the sealing ring and the valve seat and the valve body and the ball, and the spring pushes the valve seat and the ball to achieve low-pressure sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a ball valve having a hard sealing valve seat structure in an embodiment;

[0020] Figure 2 for Figure 1 A partial enlarged view of the middle A area;

[0021] The numbers in the figure are as follows: 1-valve body; 2-second sealing ring; 3-first sealing ring; 4-sealing pressure ring; 5-pressing sleeve; 6-four open rings; 7-screws; 8-pre-pressed piece; 9-valve seat; 10-ball. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0023] Example

[0024] See also Figure 1 , 2 A hard-sealed valve seat structure comprises a ball 10, a valve seat 9 and a valve body 1 connected in sequence, and further comprises: a first pre-tightening assembly arranged between the valve seat 9 and the valve body 1; a second pre-tightening assembly and a sealing assembly arranged between the ball 10 and the valve body 1, wherein the second pre-tightening assembly is arranged on the side facing the ball 10; the sealing assembly comprises a sealing pressure ring 4, a first sealing ring 3 and a second sealing ring 2 stacked in sequence, wherein the sealing pressure ring 4 is arranged on the side facing the second pre-tightening assembly.

[0025] In this embodiment, the first pre-tightening assembly includes a plurality of pre-stressing parts 8, and the plurality of pre-stressing parts 8 are evenly distributed along the circumferential direction on the end surface of the valve seat 9 facing the valve body 1; the pre-stressing parts 8 are embedded in the end surface of the valve seat 9 facing the valve body 1; and the pre-stressing parts 8 are springs.

[0026] In this embodiment, the second pre-tightening assembly includes a pressing sleeve 5 mounted on the valve seat 9, and a plurality of screws 7 threadedly connected to the pressing sleeve 5; a four-open ring 6 is arranged between the head end of the screw 7 and the valve body 1; the side of the four-open ring 6 facing away from the head end of the screw 7 is embedded in the valve body 1; the screw 7 is a hexagon socket screw.

[0027] In this embodiment, a gasket is provided at the abutment position between the ball 10 and the valve seat 9 .

[0028] In this embodiment, the valve body 1 includes an inlet valve body and an outlet valve body, and the inlet valve body and the outlet valve body together form a valve cavity; the hard sealing valve seat structure is respectively arranged at the inlet and outlet of the valve cavity.

[0029] Working principle:

[0030] The hard-sealed valve seat structure of the present embodiment realizes pre-tightening of the valve seat 9 and the sealing surface of the ball 10 through the first pre-tightening component to achieve low-pressure sealing; and then through the joint action of the second pre-tightening component and the sealing component, the hard-sealed valve seat structure becomes a whole, which can realize the sealing of the sealing ring while also effectively dust-proof sealing of the powder in the flow channel; specifically, the hard-sealed valve seat structure of the present embodiment compresses the sealing pressure ring 4 through the screw 7, provides sufficient pre-tightening force to the first sealing ring 3 and the second sealing ring 2, and thus provides sufficient sealing performance after being sleeved on the valve seat 9; and then provides pre-tightening force through the pre-pressing member 8 to push the valve seat and the ball to achieve low-pressure sealing.

[0031] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A hard sealing valve seat structure, comprising a ball (10), a valve seat (9) and a valve body (1) connected in sequence, characterized in that: Also includes: A first pre-tightening component disposed between the valve seat (9) and the valve body (1); A second pre-tightening component and a sealing component are arranged between the ball (10) and the valve body (1), wherein the second pre-tightening component is arranged on a side facing the ball (10); The sealing assembly comprises a sealing pressure ring (4), a first sealing ring (3) and a second sealing ring (2) which are stacked in sequence, and the sealing pressure ring (4) is arranged on a side facing the second pre-tightening assembly.

2. A hard sealing valve seat structure according to claim 1, characterized in that: The first pre-tightening assembly comprises a plurality of pre-stressing parts (8), and the plurality of pre-stressing parts (8) are evenly distributed along the circumferential direction on the end surface of the valve seat (9) facing the valve body (1).

3. A hard sealing valve seat structure according to claim 2, characterized in that: The pre-pressed part (8) is embedded in the end surface of the valve seat (9) facing the valve body (1).

4. A hard sealing valve seat structure according to claim 2, characterized in that: The pre-pressing member (8) is a spring.

5. A hard sealing valve seat structure according to claim 1, characterized in that: The second pre-tightening assembly comprises a compression sleeve (5) sleeved on the valve seat (9), and a plurality of screws (7) threadedly connected to the compression sleeve (5).

6. A hard sealing valve seat structure according to claim 5, characterized in that: Four open rings (6) are arranged between the head end of the screw (7) and the valve body (1).

7. A hard sealing valve seat structure according to claim 6, characterized in that: The side of the four open rings (6) facing away from the head end of the screw (7) is embedded in the valve body (1).

8. A hard sealing valve seat structure according to claim 5, characterized in that: The screw (7) is a hexagon socket screw.

9. A hard sealing valve seat structure according to claim 1, characterized in that: A gasket is provided at the position where the ball (10) abuts against the valve seat (9).

10. A hard sealing valve seat structure according to claim 1, characterized in that: The valve body (1) comprises an inlet valve body and an outlet valve body, wherein the inlet valve body and the outlet valve body together form a valve cavity; the hard sealing valve seat structure is respectively arranged at the inlet and the outlet of the valve cavity.

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