Valve body of natural gas pipeline valve

Abstract

The utility model discloses a natural gas pipeline valve body, and relates to the technical field of natural gas valves. The check valve comprises a valve body, a valve seat is fixedly arranged in the valve body, the valve seat divides the interior of the valve body into a first cavity and a second cavity, a valve hole is formed in the valve seat, and the first cavity and the second cavity are communicated through the valve hole; the valve cover is in threaded connection with the valve body; the first valve rod is in threaded connection with the valve cover and extends into the first cavity, and a valve clack is fixed to the end, located in the first cavity, of the valve rod; the second valve rod is in threaded connection with the first valve rod and extends into the second cavity along the valve hole, and an upper pressing block is fixedly installed at the end, located in the second cavity, of the second valve rod; hand wheels are fixedly mounted on the first valve rod and the second valve rod. According to the natural gas pipeline valve, the upper pressing block can play a role in supporting the valve seat, when the valve clack is pressed downwards, pressure borne by the valve seat can be effectively dispersed, and compared with a traditional natural gas pipeline valve, the natural gas pipeline valve is not prone to deformation due to downward pressure exerted by the valve clack.

Description

TECHNICAL FIELD

[0001] The utility model belongs to natural gas valve field, concretely relates to a natural gas pipeline valve valve body. BACKGROUND

[0002] Natural gas pipeline valve is the key component in natural gas conveying system, is used for controlling the flow, pressure and flow direction of natural gas, the type of common valve has gate valve, stop valve, ball valve and butterfly valve etc., wherein, stop valve is good because of sealing performance, is applicable to the pipeline that needs to adjust flow, such as in some small natural gas distribution branch line, effectively control natural gas flow by adjusting the opening of stop valve.

[0003] However, stop valve is relied on the lift of valve clack to control the opening and closing of valve, and the valve clack moves up and down along the center line of valve seat under the drive of valve rod, when the valve clack is attached to the valve seat, the valve is closed, when the valve clack leaves the valve seat, the valve is opened, but because the working principle of stop valve is that the higher pressure between valve clack and valve seat makes the sealing between them, which leads to that with the increase of use time, the valve clack exerts downward pressure under the drive of valve rod, the valve seat is stressed and is easy to deform downward, the opening between valve seats is increased, or the gap between valve clack and valve seat is generated, causing gas leakage.

[0004] Therefore, the utility model is provided. CONTENT

[0005] The utility model solves the problems in the background art.

[0006] To solve the above technical problems, the basic idea of the technical scheme of the utility model is as follows:

[0007] A natural gas pipeline valve valve body, comprising: valve body, the valve seat is fixedly arranged in the valve body, the valve seat divides the valve body into first cavity and second cavity, the valve seat is provided with valve hole, the valve hole is connected with the first cavity and the second cavity;Valve cover, which is threadedly connected with the valve body;First valve rod, which is threadedly connected with the valve cover and extends into the first cavity, and one end of the valve rod in the first cavity is fixed with a valve clack;Second valve rod, which is threadedly connected with the first valve rod and extends into the second cavity along the valve hole, and one end of the second valve rod in the second cavity is fixedly installed with an upper pressing block;Hand wheel is fixedly installed on the first valve rod and the second valve rod.

[0008] Optionally, the first valve rod is provided with an extension ring, and the extension ring is fixed with the valve clack and the first valve rod.

[0009] Optionally, the extension ring is provided with a sealing ring, and the valve seat is provided with a sealing groove matched with the sealing ring.

[0010] Optionally, the first valve rod is fixed with an upper abutting ring, the upper abutting ring abuts against the valve cover, and the first valve rod is limited from moving upward.

[0011] Optionally, the upper abutting ring abuts against the valve cover, and the upper abutting ring is attached to the inner wall of the valve body and seals the valve body.

[0012] Optionally, the valve seat is provided with a charging hole at one end of the valve seat, a plurality of fillers are fixed in the charging hole, and the first valve rod is in sliding connection with the fillers.

[0013] Optionally, the second valve rod is provided with a through hole on the part of the second valve rod protruding from the valve disc.

[0014] After the technical scheme is adopted, the utility model has the following beneficial effects compared with the prior art.

[0015] 1. The upper pressing block on the second valve rod is driven to move upward in the second cavity of the valve body, the upper pressing block abuts against the valve seat to close the valve hole, the upper pressing block can support the valve seat and close the valve hole, then the first valve rod is rotated, the valve disc on the first valve rod moves downward, the valve disc abuts against the valve hole to close the valve hole, the valve seat is less likely to be deformed under pressure compared with the conventional natural gas pipeline valve, the valve disc and the upper pressing block can both seal, and the sealing performance is improved.

[0016] 2. The extension ring is arranged on the first valve rod, the extension ring is fixed with the valve disc and the first valve rod, the sealing ring is arranged on the extension ring, the sealing groove is arranged on the valve seat, the sealing ring moves with the extension ring and the valve disc to the valve seat during the closing of the valve, the sealing ring is embedded in the sealing groove of the valve seat when the valve disc contacts the valve seat to achieve primary sealing, the sealing ring is extruded in the sealing groove, and the small gap between the sealing groove and the sealing ring is filled, so that the natural gas is prevented from leaking from the side between the valve disc and the valve seat, and secondary sealing is achieved.

[0017] The specific implementation of the utility model will be described in further detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings in the following description are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings,

[0019] In the drawings:

[0020] Figure 1 It is a schematic view of the three-dimensional structure of the valve;

[0021] Figure 2It is a sectional view of the valve;

[0022] Figure 3 It is an enlarged view of A in Figure 3

[0023] Figure 4 It is a connection structure diagram of the first valve rod and the second valve rod.

[0024] In the drawings, the components represented by each reference numeral are listed as follows:

[0025] 1, valve body; 2, valve seat; 3, first cavity; 4, second cavity; 5, valve hole; 6, valve cover; 7, first valve rod; 8, valve flap; 9, second valve rod; 10, upper pressing block; 11, hand wheel; 12, extension ring; 13, sealing ring; 14, sealing groove; 15, upper abutting ring; 16, charging hole; 17, packing; 18, through hole.

[0026] It should be noted that these drawings and written descriptions are not intended to limit the scope of the concept of the utility model in any way, but to illustrate the concept of the utility model to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0027] The utility model will be further described in detail in combination with the drawings.

[0028] The natural gas pipeline stop valve is a valve widely used in natural gas conveying and distribution systems, which is mainly used to cut off or connect the flow of natural gas, and can adjust the flow to a certain extent.

[0029] The traditional stop valve is usually composed of a valve body, a valve flap, a valve rod, a hand wheel and the like. The valve body is the shell of the valve, which provides support and accommodation space for other components, and is connected with the pipeline. The valve flap is the key sealing component of the stop valve, which is generally disc-shaped, and the sealing surface can be flat or conical. The valve rod is used to connect the valve flap and the hand wheel, and the valve flap is lifted or lowered by rotating the hand wheel to drive the valve rod up and down.

[0030] ​The process before the installation of the stop valve will be introduced in detail below. Before installation, the model and specification of the stop valve should be carefully checked to see if they match the requirements of the natural gas pipeline system. The nominal pressure, nominal diameter, and connection method of the valve should also be checked to ensure their correctness. For example, the nominal pressure of the valve should not be lower than the maximum working pressure of the pipeline system. The appearance of the valve should be checked for any damage, such as cracks in the valve body, bending of the valve stem, and scratches on the sealing surface of the valve disc. If any damage is found, the valve should be replaced or repaired in a timely manner. At the same time, the stop valve has a clear flow direction requirement. Natural gas should enter from the "inlet" side (usually above the valve disc) and flow out from the "outlet" side (usually below the valve disc). The valve must be installed strictly according to this flow direction, otherwise it will affect the sealing performance of the valve. Secondly, the valve and the pipeline can be connected by flange connection, threaded connection, or welding connection. For flange connection, the flatness of the flange face and the quality of the gasket should be ensured. During installation, the gasket is placed between the two flanges, and then the flanges are tightened evenly with bolts to compress the gasket and achieve a sealing effect. For threaded connection, a suitable amount of sealant should be applied to the threads before screwing the valve into the threaded interface of the pipeline. Note that the tightening degree should be appropriate to avoid damaging the threads. Welding connection requires professional welders to follow the welding process to ensure the quality of the weld and prevent defects such as porosity and cracks. After welding, the weld should also be subjected to non-destructive testing.

[0031] Please refer to Figures 1-4 In the present embodiment, a natural gas pipeline valve body is provided, which comprises: a valve body 1, a valve seat 2 is fixedly arranged in the valve body 1, the valve seat 2 divides the valve body 1 into a first cavity 3 and a second cavity 4, a valve hole 5 is formed in the valve seat 2, and the valve hole 5 communicates the first cavity 3 and the second cavity 4; a valve cover 6 is threadedly connected with the valve body 1; a first valve stem 7 is threadedly connected with the valve cover 6 and extends into the first cavity 3, and a valve disc 8 is fixedly arranged at one end of the first valve stem 7 in the first cavity 3; a second valve stem 9 is threadedly connected with the first valve stem 7 and extends into the second cavity 4 along the valve hole 5, and an upper pressing block 10 is fixedly arranged at one end of the second valve stem 9 in the second cavity 4; a hand wheel 11 is fixedly arranged on the first valve stem 7 and the second valve stem 9.

[0032] Please refer to Figures 2-4When the valve body 1 of the natural gas pipeline valve needs to be closed, first rotate the second valve rod 9 to drive the upper pressing block 10 on the second valve rod 9 to move upward in the second cavity 4 of the valve body 1, and the upper pressing block 10 is tightly closed with the valve seat 2 to close the valve hole 5. At this time, the upper pressing block 10 can support the valve seat 2 and close the valve hole 5. Then rotate the first valve rod 7 to make the valve flap 8 on the first valve rod 7 move downward, and the valve flap 8 tightly closes the valve hole 5. Because the upper pressing block 10 can support the valve seat 2, the valve seat 2 is less likely to be deformed under pressure compared with the traditional natural gas pipeline valve when the valve flap 8 is pressed downward. At the same time, the valve flap 8 and the upper pressing block 10 can both play a sealing role, which can effectively improve the sealing performance and solve the problem that the traditional natural gas pipeline valve is prone to deformation under pressure as the use time increases, the valve flap 8 exerts downward pressure under the drive of the valve rod, the valve seat 2 is stressed and is prone to downward deformation, the opening between the valve seats 2 increases, or a gap is formed between the valve flap 8 and the valve seat 2, causing gas leakage.

[0033] Please refer to Figure 3 By providing an extension ring 12 on the first valve rod 7, the extension ring 12 is fixed with the valve flap 8 and the first valve rod 7, and a sealing ring 13 is provided on the extension ring 12, and a sealing groove 14 matching the sealing ring 13 is provided on the valve seat 2. During the closing process of the valve, the sealing ring 13 moves with the extension ring 12 and the valve flap 8 towards the valve seat 2. When the valve flap 8 contacts the valve seat 2 to achieve primary sealing, the sealing ring 13 is also embedded in the sealing groove 14 of the valve seat 2. The sealing ring 13 is usually made of materials with good elasticity and sealing performance, such as rubber, polytetrafluoroethylene, etc. The sealing ring 13 is squeezed in the sealing groove 14, filling the small gap between the sealing groove 14 and the sealing ring 13, thereby preventing natural gas from leaking from the side between the valve flap 8 and the valve seat 2, and playing a secondary sealing role.

[0034] Please refer to Figure 3 By fixing an upper abutting ring 15 on the first valve rod 7, the upper abutting ring 15 abuts against the valve cover 6, and at the same time, when the first valve rod 7 is limited to move upwards and abut against the valve cover 6, the upper abutting ring 15 is attached to the inner wall of the valve body 1 and seals the valve body 1. During the opening process of the valve, the valve rod pulls up the valve flap 8. When the valve rod moves to a certain extent, the upper abutting ring 15 contacts the valve cover 6, which can limit the upward movement of the first valve rod 7. In addition, the upper abutting ring 15 is attached to the inner wall of the valve body 1. During the closing or opening process of the valve, natural gas is prone to flowing upwards through the gap between the valve rod and the valve body 1, and the upper abutting ring 15 effectively blocks the leakage path.

[0035] Please refer to Figure 2The loading hole 16 opened on the valve seat 2 is a space for placing the packing 17, the loading hole 16 faces the valve body 1, and the packing 17 can surround the valve rod and play a sealing and supporting role, the size and shape of the loading hole 16 are designed according to the shape and number of the packing 17, and the loading hole 16 is usually a cylindrical hole to adapt to the cylindrical packing 17, the packing 17 plays a crucial role in the valve, and the main function is to prevent natural gas from leaking from the gap between the valve rod and the valve seat 2, and the packing 17 is usually made of a material with good sealing performance, corrosion resistance and a certain elasticity. For example, the commonly used packing 17 materials are polytetrafluoroethylene (PTFE) and graphite. The PTFE packing 17 has excellent chemical stability and can resist the corrosion of various chemical substances in natural gas, and the friction coefficient is low, which is beneficial to the smooth sliding of the valve rod. The graphite packing 17 has good high-temperature resistance and self-lubricating performance and is widely used in some valves in high-temperature environments.

[0036] Please refer to Figures 3-4 A through hole 18 is opened on the part of the second valve rod 9 protruding from the valve disc 8, which can assist the flow of natural gas.

[0037] The utility model is not limited to the above-mentioned embodiment, any person should know the structural change made under the inspiration of the utility model, and any technical scheme with the same or similar utility model falls into the protection scope of the utility model. The utility model does not describe the technology, shape and structure part in detail, which is the known technology.

Claims

1. A natural gas pipeline valve body, characterized by, The utility model relates to a valve, which comprises: a valve body (1) in which a valve seat (2) is fixedly arranged, the valve seat (2) divides the valve body (1) into a first cavity (3) and a second cavity (4), and a valve hole (5) is formed in the valve seat (2) and communicates the first cavity (3) and the second cavity (4); a valve cover (6) which is threadedly connected with the valve body (1); a first valve rod (7) which is threadedly connected with the valve cover (6) and extends into the first cavity (3), and a valve disc (8) is fixedly arranged at one end of the first valve rod (7) in the first cavity (3); a second valve rod (9) which is threadedly connected with the first valve rod (7) and extends into the second cavity (4) along the valve hole (5), and an upper pressing block (10) is fixedly arranged at one end of the second valve rod (9) in the second cavity (4); a hand wheel (11) is fixedly arranged on the first valve rod (7) and the second valve rod (9).

2. A valve body for a natural gas pipeline valve according to claim 1, wherein An extension ring (12) is arranged on the first valve rod (7) and fixedly connected with the valve disc (8) and the first valve rod (7).

3. A valve body for a natural gas pipeline valve according to claim 2, wherein A sealing ring (13) is arranged on the extension ring (12), and a sealing groove (14) which is matched with the sealing ring (13) is arranged on the valve seat (2).

4. A valve body for a natural gas pipeline valve according to claim 1, wherein An upper abutting ring (15) is fixedly arranged on the first valve rod (7) and abuts against the valve cover (6) to limit the upward movement of the first valve rod (7).

5. A valve body for a natural gas pipeline valve according to claim 4, wherein The upper abutting ring (15) abuts against the valve cover (6) and is tightly attached to the inner wall of the valve body (1) to seal the valve body (1).

6. A valve body for a natural gas pipeline valve according to claim 1, wherein A loading hole (16) is formed at one end of the valve seat (2) towards the valve body (1), and a plurality of packing rings (17) are fixedly arranged in the loading hole (16), and the first valve rod (7) is slidably connected with the packing rings (17).

7. A valve body for a natural gas pipeline valve according to claim 1, wherein A through hole (18) is formed in the part of the second valve rod (9) which protrudes from the valve disc (8).

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