Gas ball valve

Abstract

The utility model relates to ball valve technical field especially relates to a kind of gas ball valve, including valve body and valve cover, the valve body and valve cover are connected to form the passageway for fluid flow, the passageway center is equipped with the valve chamber of swelling, ball is provided in the valve chamber, valve rod is equipped with in the valve chamber lateral wall, the valve rod is connected with ball to drive its rotation, the valve chamber is respectively equipped with annular sealing seat on the inner wall of passageway upstream and downstream, ball is clamped between the sealing seat of upstream and downstream;Each sealing seat includes copper fireproof protective sleeve, flexible sealing ring, fireproof protective sleeve is exposed in passageway, sealing ring is separated by fireproof protective sleeve between passageway;Fireproof protective sleeve inside is equipped with clamping groove, and sealing ring is clamped in the clamping groove.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, and in particular to a gas ball valve. Background Technology

[0002] In gas control systems, ball valves are crucial opening and closing control devices. Currently, known gas ball valves typically consist of a steel valve body, steel valve cover, valve seat seal ring, ball, and valve stem, with the seal ring and ball placed together in the cavity formed by the valve body and valve cover. However, this traditional structure has several problems:

[0003] (1) Insufficient fire resistance and antistatic safety: The sealing ring is completely exposed in the fluid passage of the valve body. When there is a fire source outside the pipeline or when static sparks are generated in the valve cavity due to friction of the medium, the flammable sealing ring material is easily ignited or permanently deformed due to high temperature, causing a safety accident.

[0004] (2) Poor long-term reliability: The ball of the ball valve is a large solid structure with a large weight. During long-term use, the continuous gravity can easily cause the sealing ring below to deform, which directly affects the sealing performance of the valve, resulting in incomplete closure. It may also increase the friction torque when the ball rotates, reduce the flexibility of opening and closing operations, and even cause jamming, ultimately affecting the reliable operation of the entire control system. Utility Model Content

[0005] This utility model provides a gas ball valve with fire resistance and high reliability.

[0006] This utility model relates to a gas ball valve, comprising a valve body and a valve cover. The valve body and valve cover are connected to form a channel for fluid flow. An enlarged valve chamber is provided at the center of the channel. A ball is disposed in the valve chamber, and a valve stem is inserted through the side wall of the valve chamber. The valve stem is connected to the ball to drive its rotation. The valve chamber has annular sealing seats on the inner walls of the upstream and downstream sides of the channel, and the ball is clamped between the upstream and downstream sealing seats. Each sealing seat includes a copper fireproof protective sleeve and a flexible sealing ring. The fireproof protective sleeve is exposed inside the channel, and the sealing ring is separated from the channel by the fireproof protective sleeve. A groove is provided on the inner side of the fireproof protective sleeve, and the sealing ring is clamped in the groove.

[0007] Beneficial effects: (1) Safety, fire prevention and anti-static: The copper fireproof protective sleeve acts as a barrier to the fluid channel, physically separating the flammable flexible sealing ring from the gas and potential fire sources and static sparks in the flow channel. When exposed to open flame or high temperature, the protective sleeve can prevent the sealing ring from directly contacting and igniting. Even if the sealing ring fails due to abnormal high temperature, the ball and the copper sleeve can still form a metal-to-metal hard seal, effectively preventing media leakage and achieving safety redundancy; (2) Rigid support and deformation resistance: The copper protective sleeve provides stable support for the ball, maintaining the alignment of the ball and the sealing pair for a long time, ensuring the long-term stability of the valve's sealing performance and the flexibility of opening and closing operations; (3) The structure achieves a dual sealing effect of "rigidity and flexibility". Under normal working conditions, the ball and the flexible sealing ring form a tight elastic seal, ensuring zero leakage when cutting off; under abnormal working conditions, the transition fit between the ball and the fireproof protective sleeve serves as a reliable hard seal. The two work together to significantly improve the sealing reliability of the valve under different working conditions.

[0008] Furthermore, the sphere and the fireproof protective sleeve are fitted together to form an elastic seal with the sealing ring. Under normal operation, the flexible sealing ring provides excellent elastic sealing, ensuring zero leakage during disconnection; under abnormally high temperatures such as fire, even if the flexible sealing ring deforms at high temperatures, the sphere and the fireproof protective sleeve can still form an effective hard seal through the fit, preventing media leakage.

[0009] Furthermore, a stepped sealing groove is formed on the inner wall of the valve chamber, within which the sealing seat is installed. The stepped sealing groove provides precise installation positioning and stable support for the composite sealing seat, preventing displacement or loosening under medium pressure or long-term use, thus ensuring the long-term stability and consistency of the sealing pair.

[0010] Furthermore, the valve body has a valve stem hole for inserting the valve stem. A packing groove is formed on the inner wall of the valve stem hole, and an O-ring, V-packing, and a spacer gasket are sequentially installed in this groove. This multi-stage sealing structure constitutes a dynamic sealing system at the valve stem: the O-ring serves as the primary seal, the V-packing provides a self-tightening seal, and the spacer gasket reduces valve stem rotational friction and assists in sealing. This combination effectively copes with the rotational movement and fretting of the valve stem, significantly improving the sealing reliability of the valve stem area and preventing external leakage.

[0011] Furthermore, the number of O-rings is two sets. Beneficial effect: The double sets of O-rings form a dual sealing barrier, greatly enhancing the redundancy and safety of the seal. Even if one seal deteriorates due to wear or aging, the other seal can still function effectively, thus significantly extending the service life and overall reliability of the valve stem sealing system.

[0012] Furthermore, the isolation gasket is a plastic isolation gasket. Using plastic material for the isolation gasket provides excellent wear resistance and a low coefficient of friction, effectively isolating the packing below from the valve stem, reducing operating torque, providing auxiliary sealing, and minimizing damage to the valve stem surface.

[0013] Furthermore, both the valve body and valve cover are integrally cast aluminum alloy parts. This integral casting not only ensures the structural strength and integrity of the valve body and valve cover, avoiding defects that may result from welding, but also significantly reduces the overall weight of the valve, facilitating transportation and installation, thus achieving a balance between strength and lightweight design. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the gas ball valve. Detailed Implementation

[0015] The following detailed description illustrates the specific implementation method:

[0016] The reference numerals in the accompanying drawings include: valve body 1, valve cover 2, fireproof protective sleeve 3, valve seat sealing ring 4, valve stem 5, ball 6, stop sealing gasket 7, screw 8, V-type packing 9, isolation flat gasket 10, O-ring 11, sealing nut 12, and lock nut 13.

[0017] Example

[0018] like Figure 1 As shown, the gas ball valve in this embodiment is a shut-off device specifically designed for gas and other fluid media conveying systems.

[0019] The valve body 1 and valve cover 2 constitute the main pressure-bearing structure of the gas ball valve. They are connected by a middle flange and fastened with screws 8. A stop sealing gasket 7 is provided on the mating surface to ensure static sealing. Both the valve body 1 and valve cover 2 are integral castings of aluminum alloy, which achieves lightweight while ensuring structural strength. The connection between the two forms a channel for fluid to pass through, and an enlarged valve chamber is located in the center of the channel.

[0020] The valve body 1 has a valve stem hole for inserting the valve stem 5. After the valve stem 5 is inserted into the valve stem hole, it is fixedly connected to the ball 6. The valve stem 5 employs a multi-layer sealing design: a packing groove is provided inside the valve stem hole, in which two sets of O-rings 11, several V-type packings 9, and a spacer gasket 10 are installed sequentially from top to bottom. The O-rings 11 provide the main seal, the V-type packings 9 enhance the self-tightening sealing effect, and the spacer gasket 10 reduces friction and assists in sealing. The sealing nut 12 compresses the packings and is fixed by the locking nut 13. The sealing effect can be optimized by adjusting the torque of the sealing nut 12.

[0021] The ball 6 has a circular through hole and is fixedly connected to the valve stem 5. When the valve stem 5 is rotated, the ball 6 is rotated, thereby controlling the opening or closing of the gas ball valve. When the circular through hole of the ball 6 is connected to the channel, the gas ball valve is open; when the valve stem 5 is rotated to 90°, the circular through hole of the ball 6 is perpendicular to the channel of the valve body 1, and the ball 6 is pressed tightly against the sealing working surface of the sealing seat, thus closing the gas ball valve.

[0022] An annular sealing seat is installed on the inner wall of the valve chamber at both the upstream and downstream ends of the channel. Specifically, a stepped sealing groove is cut into the inner wall of the valve chamber, and the sealing seat is installed within the sealing groove. Each sealing seat is a composite structure consisting of a fireproof protective sleeve 3 and a sealing ring 4.

[0023] (1) Fireproof protective sleeve 3: Located on the outside of the stepped sealing groove, directly exposed in the channel, the fireproof protective sleeve 3 is made of pure copper. The inside of the fireproof protective sleeve 3 is provided with a groove, and the sealing ring 4 is fastened between the groove and the stepped sealing groove.

[0024] The main functions of the fireproof protective sleeve 3 are: first, to provide fire protection and prevent the sealing ring 4 from being exposed and coming into contact with the gas in the channel. When there is a source of fire, static electricity or high temperature, it can prevent the sealing ring 4 from catching fire; second, the ball 6 is very heavy, and the fireproof protective sleeve 3 made of pure copper will not deform after long-term use, which can maintain the sealing and opening and closing flexibility of the ball valve.

[0025] (2) Sealing ring 4: Usually made of polytetrafluoroethylene (PTFE) or other high-performance elastic materials. The sealing ring 4 is separated from the gas passage by a fireproof protective sleeve 3.

[0026] The sphere 6 and the fireproof protective sleeve 3 are in a transitional fit, providing stable support and guidance; at the same time, the sphere 6 and the flexible sealing ring 4 form an elastic seal.

[0027] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A gas ball valve, comprising a valve body and a valve cover, wherein the valve body and the valve cover are connected to form a channel for fluid flow, an enlarged valve chamber is provided at the center of the channel, a ball is disposed in the valve chamber, and a valve stem is provided through the side wall of the valve chamber, the valve stem being connected to the ball to drive its rotation, characterized in that: The valve chamber has annular sealing seats on the inner walls of the upstream and downstream channels, and the ball is clamped between the upstream and downstream sealing seats. Each sealing seat includes a copper fireproof protective sleeve and a flexible sealing ring. The fireproof protective sleeve is exposed inside the channel, and the sealing ring is separated from the channel by the fireproof protective sleeve. The inner side of the fireproof protective sleeve has a groove, and the sealing ring is clamped in the groove.

2. The gas ball valve according to claim 1, characterized in that: The sphere transitions into the fireproof protective sleeve and forms an elastic seal with the sealing ring.

3. The gas ball valve according to claim 2, characterized in that: A stepped sealing groove is formed on the inner wall of the valve chamber, and the sealing seat is installed in the sealing groove.

4. The gas ball valve according to claim 3, characterized in that: The valve body has a valve stem hole for inserting the valve stem, and a packing groove is formed on the inner wall of the valve stem hole. An O-ring, a V-type packing and a spacer gasket are installed in sequence in the packing groove.

5. The gas ball valve according to claim 4, characterized in that: The number of O-rings is two sets.

6. The gas ball valve according to claim 5, characterized in that: The isolation pad is a plastic isolation pad.

7. The gas ball valve according to claim 6, characterized in that: Both the valve body and valve cover are integral castings of aluminum alloy.

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