Three-eccentric center butterfly valve with floating valve seat

Abstract

A three-eccentric center butterfly valve with a floating valve seat relates to the technical field of fluid control and comprises a valve body and a butterfly plate, a Z-shaped valve seat is arranged in an inner cavity of the valve body, a plurality of spring holes are formed in the inner side face of the valve seat at equal intervals along the circumference of the valve seat, springs are arranged in the spring holes, one ends of the springs abut against the spring holes, and the other ends of the springs abut against the butterfly plate. The other end of the spring abuts against the step surface in the valve body; a top ring is arranged on the outer side face of the valve seat, and a three-piece ring is arranged on the outer side of the top ring. A sealing ring is arranged in a groove in the bottom of the butterfly plate; when the valve is closed, the sealing ring is in contact with the valve seat to realize sealing; according to the three-eccentric center butterfly valve, the sealing of the three-eccentric center butterfly valve is changed from torque sealing to medium pressure and torque sealing, the torque of the valve is effectively reduced, and therefore the requirement for a higher sealing grade is met.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control, in particular to a triple-eccentric butterfly valve with a floating valve seat. Background Art

[0002] Since its introduction, triple-eccentric butterfly valves have undergone a process of self-improvement and continuous development to meet increasingly stringent operating conditions. Currently, triple-eccentric butterfly valves on the market rely on the valve's actuator to provide torque to achieve sealing, known as "torque sealing." However, the sealing pressure ratio required for triple-eccentric butterfly valves is very high, requiring a sufficiently high closing torque (especially to overcome unbalanced torque during reverse operation) to achieve a seal. To provide this high torque, the valve actuator must be large, rigid, and powerful, requiring significant energy consumption. Furthermore, the valve seats of current triple-eccentric butterfly valves are fixed, while the sealing pressure ratio between the sealing pairs is very high. This can easily cause the sealing pairs to bind together, preventing the valve from opening, especially during temperature fluctuations. Utility Model Content

[0003] In view of the above deficiencies in the prior art, the purpose of the present invention is to provide a triple-eccentric butterfly valve with a floating valve seat, which can solve the technical problems of the prior art triple-eccentric butterfly valve seal being a torque seal with high energy consumption and easy biting.

[0004] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0005] A triple-eccentric butterfly valve with a floating valve seat comprises a valve body and a butterfly plate, a Z-shaped valve seat is provided in the inner cavity of the valve body, a plurality of spring holes are equidistantly provided on the inner side surface of the valve seat along its circumference, a spring is provided in the spring hole, one end of the spring abuts against the spring hole, and the other end abuts against the step surface in the valve body; a top ring is provided on the outer surface of the valve seat, and three open rings are provided on the outer side of the top ring; a sealing ring is provided in the groove at the bottom of the butterfly plate; when the valve is closed, the sealing ring contacts the valve seat to achieve sealing.

[0006] Preferably, a plurality of pressure-passing holes are equidistantly provided on the surface of the top ring in contact with the valve seat.

[0007] Preferably, spring energy storage sealing rings are provided on the upper and lower sides of the top ring.

[0008] Preferably, the three-open-ring boss is embedded in the groove of the valve body.

[0009] Preferably, the three-open ring is locked in the valve body groove by means of set screws.

[0010] Preferably, the contact surfaces between the sealing ring and the valve seat are both inclined surfaces.

[0011] Preferably, the valve seat is fixed in the inner cavity of the valve body by means of three open rings and set screws.

[0012] Compared with existing technologies, the present invention offers the following advantages: It transforms the sealing of a triple-eccentric butterfly valve from a torque-based seal to a medium pressure plus torque-based seal, effectively reducing valve torque and achieving higher sealing requirements. Once the butterfly valve establishes an initial seal, no additional torque is required. The unbalanced force generated by the medium pressure on the valve seat pushes the valve seat against the sealing ring, achieving a bidirectional seal. The floating valve seat prevents the seals from seizing. Position, torque, and the medium's own pressure provide a dual sealing force, significantly reducing the valve's drive torque and making it easier to open and close the valve. This also reduces the procurement cost of the valve drive device, saving both capital and energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0014] Figure 1 This is a schematic diagram of the sealing effect of the forward flow of the medium of the present invention;

[0015] Figure 2 This is a schematic diagram of the medium reverse flow sealing effect of the utility model;

[0016] Figure 3 This is a schematic diagram of the top ring structure of the present utility model.

[0017] Description of reference numerals:

[0018] 1-valve body, 2-butterfly plate, 3-valve seat, 4-spring hole, 5-spring, 6-top ring, 7-three-open ring, 8-sealing ring, 9-pressure hole, 10-spring energy storage sealing ring, 11-set screw. DETAILED DESCRIPTION

[0019] The following describes the invention of the present invention in detail by way of examples in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0020] Example

[0021] like Figures 1 to 3As shown, the utility model discloses a triple-eccentric butterfly valve with a floating valve seat, comprising a valve body 1 and a butterfly plate 2. A Z-shaped valve seat 3 is provided in the inner cavity of the valve body 1. A plurality of spring holes 4 are equidistantly provided on the inner side surface of the valve seat 3 along its circumference. A spring 5 is provided in the spring hole 4. One end of the spring 5 abuts against the spring hole 4, and the other end abuts against the step surface in the valve body 1. The valve seat 3 is connected to the valve body 1 via the spring 5, so that the valve seat 3 can float on the valve body 1. A top ring 6 is provided on the outer surface of the valve seat 3. Several spring holes 4 are equidistantly provided on the surface of the top ring 6 in contact with the valve seat 3. Dry pressure hole 9; spring energy storage sealing rings 10 are provided on the upper and lower sides of the top ring 6 for sealing the valve seat 3 and the valve body 1; a three-open ring 7 is provided on the outside of the top ring 6, and the boss of the three-open ring 7 is embedded in the groove of the valve body 1, and the three-open ring 7 is locked in the groove of the valve body 1 by a set screw 11; the valve seat 3 is fixed in the inner cavity of the valve body 1 by the three-open ring 7 and the set screw 11; a sealing ring 8 is provided in the groove at the bottom of the butterfly plate 2; when the valve is closed, the sealing ring 8 contacts the valve seat 3 to achieve sealing, and the contact surfaces of the sealing ring 8 and the valve seat 3 are both inclined surfaces.

[0022] Working principle: When the valve is closed, the sealing ring 8 contacts the valve seat 3, and the torque is continued to increase to increase the sealing pressure between the sealing surfaces. When the minimum pressure required for pre-tightening is reached, the butterfly valve establishes the initial seal and no further torque needs to be increased.

[0023] When the medium flows in the Figure 1 In the positive direction, the pressure area B at the front end of the valve seat 3 is smaller than the pressure area A at the rear end. The medium pressure generates an unbalanced force on the valve seat 3, pushing the valve seat 3 toward the sealing ring 8. As the medium pressure increases, the sealing specific pressure generated also increases, causing the valve seat 3 to press the sealing ring 8 and maintain the seal.

[0024] When the medium flows in the Figure 2 In the reverse direction, the pressure area D at the front end of the valve seat 3 is smaller than the pressure area C at the rear end. The medium pressure generates an unbalanced force on the valve seat 3, pushing the valve seat 3 toward the sealing ring 8. As the medium pressure increases, the sealing specific pressure generated also increases, causing the valve seat 3 to press the sealing ring 8 and maintain the seal.

[0025] In summary, regardless of whether the medium is flowing in the forward or reverse direction, once the butterfly valve is fully closed and the initial seal is established, no additional torque is required. The unbalanced force generated by the medium pressure on the valve seat 3 pushes the valve seat 3 against the sealing ring 8, achieving a bidirectional seal. The floating valve seat 3 prevents the seals from seizing. Position, torque, and the medium's own pressure provide a dual sealing force, significantly reducing the valve's actuation torque, making the valve easier to open and close. This also reduces the procurement cost of the valve actuator, saving both capital and energy.

[0026] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and application concept of the present invention, should be covered by the protection scope of the present invention.

Claims

1. A triple-eccentric butterfly valve with a floating valve seat, comprising a valve body (1) and a butterfly plate (2), characterized in that: A Z-shaped valve seat (3) is provided in the inner cavity of the valve body (1), and a plurality of spring holes (4) are equidistantly provided on the inner side surface of the valve seat (3) along its circumference, and a spring (5) is provided in the spring hole (4), and one end of the spring (5) abuts against the spring hole (4), and the other end abuts against the step surface in the valve body (1); a top ring (6) is provided on the outer surface of the valve seat (3), and a three-open ring (7) is provided on the outer side of the top ring (6); a sealing ring (8) is provided in the groove at the bottom of the butterfly plate (2); when the valve is closed, the sealing ring (8) contacts the valve seat (3) to achieve sealing.

2. A triple-eccentric butterfly valve with a floating valve seat as claimed in claim 1, characterized in that: A plurality of pressure-releasing holes (9) are provided at equal intervals on the surface of the top ring (6) in contact with the valve seat (3).

3. A triple-eccentric butterfly valve with a floating valve seat as claimed in claim 1, characterized in that: Spring energy storage sealing rings (10) are provided on both the upper and lower sides of the top ring (6).

4. A triple-eccentric butterfly valve with a floating valve seat as claimed in claim 1, characterized in that: The boss of the three-open ring (7) is embedded in the groove of the valve body (1).

5. A triple-eccentric butterfly valve with a floating valve seat as claimed in claim 4, characterized in that: The three-open ring (7) is locked in the slot of the valve body (1) by means of a set screw (11).

6. A triple-eccentric butterfly valve with a floating valve seat as claimed in claim 1, characterized in that: The contact surfaces between the sealing ring (8) and the valve seat (3) are both inclined surfaces.

7. A triple-eccentric butterfly valve with a floating valve seat as claimed in claim 5, characterized in that: The valve seat (3) is fixed in the inner cavity of the valve body (1) via three open rings (7) and set screws (11).

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