A valve

Abstract

The application discloses a valve, which comprises a valve body, a valve core, a compression nut, a hand wheel, a first sealing ring, a second sealing ring and a third sealing structure; the compression nut is threadedly connected with the valve body, the first sealing ring is compressed on the valve body, and sealing between the valve body and the compression nut is realized; the second sealing ring is arranged at the lower end of the valve core and cooperates with the valve port of the valve body, so that sealing of the valve is realized; the third sealing structure realizes sealing between the valve core and the compression nut; the valve core can move along the axial direction of the valve core relative to the compression nut; the hand wheel is threadedly connected with the upper end of the compression nut; and the hand wheel is rotatably and axially limitedly connected with the upper end of the valve core. The application greatly prolongs the service life of the valve, and the operation of replacing the easily-damaged parts is simple and the replacement cost is low, so that the manufacturing cost of the valve can be remarkably reduced.

Description

Technical Field

[0001] This invention relates to a valve for use in flammable and explosive environments.

[0002] Background Technology Valves used in flammable and explosive environments, such as urban gas stations, underground coal mines, chemical workshops, paint booths, and metal powder processing workshops, have strict explosion-proof requirements. Regarding the specific structure of the valve, it is required that structural components undergoing relative frictional movement cannot simultaneously be made of stainless steel. This is to prevent the generation of high-temperature friction debris between stainless steel-stainless steel friction pairs during valve operation, which could lead to explosions, fires, or other safety accidents. Therefore, valve structural components undergoing relative frictional movement are typically paired with stainless steel-copper alloys or copper alloy-copper alloys. This necessitates the use of more expensive copper alloy materials in valves used in flammable and explosive environments, increasing the valve's manufacturing cost.

[0003] like Figure 1 As shown, Chinese patent number 202120790140.9, entitled "A Valve," discloses a valve structure for use in the field of liquefied petroleum gas. A bellows 109 is welded to the valve core 102 and flange for sealing. A clamping nut 103 is threadedly connected to the valve body 101. A clamping ring 107 presses the flange, which is welded to the sealing ring 108 and the bellows 109, into the valve body 101. The bellows 109 and sealing ring 108 seal the valve's external leakage path. A valve port sealing ring 110 is provided at the lower end of the valve core 102, which cooperates with the valve port 111 to achieve valve closure sealing. The valve stem 104 is threadedly engaged with the clamping nut 103. Its lower end adopts a T-shaped head structure that cooperates with the corresponding groove structure at the upper end of the valve core 102. The upper end is connected to the handwheel 105 by a screw 106. Rotating the handwheel 105 drives the valve stem 104 to rotate. Through the threaded engagement between the valve stem 104 and the clamping nut 103, the valve stem 104 moves up and down along the axial direction. The valve stem 104, through its T-shaped head engaging with the end face of the groove structure of the valve core 102, pulls up or pushes down the valve core 102, thereby realizing the opening and closing operation of the valve.

[0004] In this valve structure, the valve stem 104 and the clamping nut 103 undergo relative helical frictional motion, and the valve core 102 groove end face undergoes moving frictional motion. Therefore, in order to meet the explosion-proof requirements for use in flammable and explosive environments, the valve stem 104 must be made of copper alloy to meet the copper alloy-stainless steel material matching requirements between the valve stem 104 and the clamping nut 103 (stainless steel), and between the valve stem 104 and the valve core 102 (stainless steel).

[0005] This valve has the following defects:

[0006] First, because copper alloy is softer than stainless steel, the T-shaped head structure at the bottom of the valve stem 104 rubs against the corresponding groove structure of the valve core over a long period of time, which can easily damage the T-shaped head structure of the valve stem 104 and greatly shorten the service life of the valve.

[0007] Secondly, when the valve stem 104 is replaced as a wear part, the entire valve core structure needs to be removed, causing the valve to lose its opening and closing function. The pipeline operation using the valve must be stopped, and the replacement cost is high.

[0008] Third, the valve stem 104 is large in size and consumes a lot of copper alloy material, resulting in high overall valve manufacturing costs.

[0009] Summary of the Invention The technical problem to be solved by the present invention is to provide a valve that overcomes one or a combination of the following defects of existing valves used in flammable and explosive environments: short service life, high cost of replacing vulnerable parts, and high manufacturing cost.

[0010] The technical solution adopted by this invention to solve its technical problem is as follows: A valve is constructed, comprising a valve body, a valve core, a clamping nut, a handwheel, a first sealing ring, a second sealing ring, a third sealing structure, and a valve core limiting mechanism; the clamping nut is threadedly connected to the valve body, pressing the first sealing ring onto the valve body to achieve a seal between the valve body and the clamping nut; the second sealing ring is disposed at the lower end of the valve core and cooperates with the valve port of the valve body to achieve a valve closure seal; the third sealing structure achieves a seal between the valve core and the clamping nut; the valve core limiting mechanism ensures that the valve core can move axially relative to the clamping nut; characterized in that the handwheel is threadedly connected to the upper end of the clamping nut; the handwheel is rotatable relative to the upper end of the valve core and is limited along the valve core axial direction.

[0011] The valve of the invention also includes an isolation sleeve, which is fitted on the upper part of the valve core and cooperates with the clamping nut; the isolation sleeve and the clamping nut and / or the isolation sleeve and the valve core move and cooperate along the valve core axis; the materials of the isolation sleeve and the clamping nut are matched to meet the safety requirements of anti-static and anti-ignition of environmental explosion.

[0012] In the valve of the invention, the clamping nut is made of stainless steel and the isolation sleeve is made of copper alloy.

[0013] In the valve of the invention, the third sealing structure and the valve core limiting mechanism include a bellows, which is fitted on the valve core, with its lower end fixedly and sealed to the lower end of the valve core, and its upper end fixedly and sealed to the clamping nut.

[0014] In the valve of the invention, the clamping nut is made of copper alloy; the valve core limiting mechanism includes a radial limiting surface that cooperates between the valve core and the clamping nut.

[0015] In the valve of the invention, the third sealing structure includes at least one third sealing ring. The portion of the valve core located in the valve cavity of the valve body is provided with a corresponding sealing ring groove. The third sealing ring is fitted into the sealing ring groove and fits tightly with the valve cavity of the valve body to achieve a seal between the valve core and the valve cavity of the valve body.

[0016] In the valve of the invention, the third sealing structure includes at least one third sealing ring. The portion of the valve core located within the valve cavity of the valve body is provided with a corresponding sealing ring groove. The third sealing ring is fitted into the sealing ring groove and seals with the valve cavity of the valve body, thereby achieving a seal between the valve core and the valve cavity of the valve body. The valve core limiting mechanism includes a radial limiting surface that cooperates between the valve core and the clamping nut; or the valve core limiting mechanism includes a radial limiting surface that cooperates between the isolation sleeve and the clamping nut, and a radial limiting surface that cooperates between the isolation sleeve and the valve core.

[0017] In the valve of the invention, the structure in which the handwheel and the upper end of the valve core are rotatable relative to each other and connected in a limiting manner along the axial direction of the valve core is as follows: The handwheel is provided with a transverse pin hole, and the pin is inserted into the transverse pin hole; the upper end of the valve core includes a T-shaped head, and the pin is engaged with the groove of the T-shaped head, thereby realizing the relative rotatability and axial limiting connection between the handwheel and the upper end of the valve core; the materials of the pin and the valve core are matched to meet the safety requirements of anti-static and prevention of environmental combustion and explosion.

[0018] In the valve of the invention, the pin is made of copper alloy and is a U-shaped pin or a straight pin.

[0019] In the valve of the invention, the structure in which the handwheel is rotatable relative to the upper end of the valve core and is axially limited and connected is as follows: it includes a limiting screw, a threaded hole is provided on the top of the valve core, and a mounting hole is provided in the middle of the handwheel corresponding to the threaded hole. The limiting screw passes through the mounting hole and engages with the threaded hole. The lower surface of the limiting screw and the upper surface of the valve core engage with each other with the handwheel, thereby realizing that the handwheel and the upper end of the valve core are rotatable relative to each other and axially limited and connected. The thread direction of the limiting screw is opposite to that of the handwheel, or the limiting screw is provided with an anti-loosening mechanism.

[0020] Compared with the prior art, the valve implementing the present invention has the following advantages:

[0021] 1. The valve stem and valve core of the existing valve are designed as a whole, and the top of the valve core is detachably connected to the handwheel. The vulnerable parts of the valve are transformed into easily replaceable and inexpensive limit screws or pins, which greatly improves the service life of the valve.

[0022] 2. The replacement of vulnerable parts is simple and the replacement cost is extremely low; the valve can be kept closed during replacement without interrupting the operation of the equipment or pipeline using the valve.

[0023] 3. In the technical solution for saving valve manufacturing costs, only the isolation sleeve and the pin of the entire valve are made of copper alloy. Except for the handwheel, which is made of aluminum alloy, all other valve parts can be made of stainless steel. Since the volume of the isolation sleeve and the pin is much smaller than the volume of the copper valve stem of the existing valve, the amount of copper alloy used in the valve is greatly reduced, and the valve manufacturing cost is significantly reduced. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of a valve currently used in flammable and explosive environments.

[0025] Figure 2 This is a cross-sectional view of Embodiment 1 of the valve of the present invention.

[0026] Figure 3 This is a three-dimensional sectional view of the pin engagement structure in Embodiment 1 of the valve of the present invention.

[0027] Figure 4 This is a cross-sectional view of Embodiment 2 of the valve of the present invention.

[0028] Figure 5 yes Figure 4 BB section view.

[0029] Figure 6 This is a cross-sectional view of Embodiment 3 of the valve of the present invention.

[0030] Figure 7 This is a three-dimensional sectional view of the limiting screw mating structure in Embodiment 3 of the valve of the present invention. Detailed Implementation

[0031] The present invention will now be described in detail with reference to typical embodiments and accompanying drawings. The same reference numerals in each view indicate the same or similar parts. Although the specification discloses typical embodiments, other embodiments may exist that modify the embodiments described herein without departing from the spirit and scope of the invention. The following detailed description does not limit the invention; the scope of protection of the invention is defined by the claims and their equivalents.

[0032] Example 1:

[0033] like Figure 2 As shown, the valve of the present invention includes a valve body 1, a valve core 2, an isolation sleeve 3, a clamping nut 4, a first sealing ring 5, a handwheel 7, a second sealing ring 9, a third sealing structure, and a valve core limiting mechanism.

[0034] The clamping nut 4 is threadedly connected to the valve body 1, pressing the first sealing ring 5 onto the valve body 1 to achieve a seal between the valve body 1 and the clamping nut 4.

[0035] The second sealing ring 9 is located at the lower end of the valve core 2 and cooperates with the valve port of the valve body 1 to achieve valve closure and sealing.

[0036] The third sealing structure achieves a seal between the valve core 2 and the clamping nut 5. In this embodiment, the third sealing structure adopts the following structure: the third sealing structure includes a bellows 6, which is fitted onto the valve core 2. The lower end of the bellows 6 is fixedly and sealingly connected to the lower end of the valve core 2, and the upper end is fixedly and sealingly connected to the clamping nut 5. The aforementioned fixed and sealing connection means that the connection is achieved in a non-removable manner and in a sealed manner, including but not limited to the connection achieved by welding, bonding, etc.

[0037] In this embodiment, the valve core limiting mechanism adopts a bellows 6 that is fixedly connected to the valve core 2 and the clamping nut 4. The rigidity of the bellows 6 is used to ensure that the valve core 2 moves relative to the clamping nut 4 along the axial direction of the valve core 2.

[0038] like Figure 2 As shown, an isolation sleeve 3 is provided, which is fitted onto the upper part of the valve core 2 and engages with the clamping nut 4. The objective of this invention can be achieved by ensuring that the isolation sleeve 3 and the clamping nut 4 are in a movable engagement along the valve core axial direction (when the isolation sleeve 3 and the valve core 2 are in an interference fit), or that the isolation sleeve 3 and the valve core 2 are in a movable engagement along the valve core axial direction (when both the isolation sleeve 3 and the valve core 2 and the clamping nut 4 are in a dynamic fit).

[0039] When there is friction between the valve isolation sleeve 3 and the clamping nut 4, their materials must meet the safety requirements for anti-static and anti-ignition / explosive properties. For example, both the isolation sleeve 3 and the clamping nut 4 may be made of copper alloy; however, to reduce valve manufacturing costs, the isolation sleeve 3 may be made of copper alloy, while the clamping nut 4 may be made of stainless steel.

[0040] Similarly, when there is friction between the valve isolation sleeve 3 and the valve core 2, their material pairing must meet the safety requirements for anti-static and prevention of environmental combustion and explosion. For example, both the isolation sleeve 3 and the valve core 2 are made of copper alloy; to reduce valve manufacturing costs, the isolation sleeve 3 is made of copper alloy, while the valve core 2 is made of stainless steel.

[0041] The handwheel 7 is usually made of aluminum alloy. The isolation sleeve 3 can be made of copper alloy or other materials that meet the safety requirements of antistatic and anti-ignition of the environment, such as aluminum alloy.

[0042] The handwheel 7 is rotatable relative to the upper end of the valve core 2 and is axially limited along the valve core. In this embodiment, a U-shaped pin structure is used for connection, specifically as follows: Figure 2 , Figure 3 As shown, the connection structure includes a U-shaped pin 8, and a handwheel 7 with a transverse pin hole, the U-shaped pin 8 being inserted into the transverse pin hole. The upper end of the valve core 2 is provided with a T-shaped head, and the pin 8 is engaged with the groove of the T-shaped head of the valve core, so that the handwheel 7 and the upper end of the valve core 2 can rotate relative to each other and be limited along the valve core axial direction.

[0043] The outer width of the pin head is greater than the width of the pin hole. The pin head has a bevel. The pin is inserted into the pin hole by the elasticity of its two pin legs. After the pin head passes through the pin hole, the two pin legs return to their original deformed state by elasticity. The pin head is constrained by the pin hole, preventing the pin from coming out. When replacing the pin, pressing the sides of the pin head will push the pin legs back into the pin hole, allowing the pin to be pulled out. The replacement operation is simple and convenient.

[0044] In other embodiments, the pin can be a straight pin. After installation, the two ends of the straight pin are bent appropriately to prevent it from coming out, thus achieving the purpose of the present invention.

[0045] When operating the valve, friction exists between the pin and the valve core 2. The materials used for the pin and valve core 2 must meet safety requirements for anti-static properties and prevention of environmental combustion and explosion. For example, both the valve core 2 and the pin can be made of copper alloy. To reduce manufacturing costs, the valve core 2 is made of stainless steel, and the pin is made of copper alloy. In this embodiment, the U-shaped pin 8 is a vulnerable part.

[0046] Handwheel 7 is threadedly connected to the upper end of clamping nut 4. When handwheel 7 moves upward along clamping nut 4, it drives valve core 2 upward through U-shaped pin 8, opening the valve. When handwheel 7 moves downward along clamping nut 4, it drives valve core 2 downward through U-shaped pin 8, closing the valve.

[0047] In this embodiment, since the third sealing structure is implemented using a bellows 6, the valve core 2 is fixedly connected to the clamping nut 4 through the bellows 6. With the help of the rigidity of the bellows 6, the valve core 2 will not rotate due to the friction of the pin when the valve handwheel 7 is operated.

[0048] Example 2

[0049] like Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that the third sealing structure adopts the following structure; the third sealing structure includes at least one third sealing ring 10 (e.g. Figure 4As shown, two third sealing rings are used. In other embodiments, one or three sealing rings can be used as needed, all of which can achieve the purpose of the present invention. The portion of the valve core 2 located in the valve cavity of the valve body 1 is provided with a corresponding sealing ring groove. The third sealing ring 10 is fitted in the sealing ring groove and is sealed to the valve cavity of the valve body 1, thereby achieving a seal between the valve core 2 and the valve cavity of the valve body 1, and at the same time achieving a seal between the valve core 2 and the clamping nut 4.

[0050] In this embodiment, to ensure that the valve core 2 always moves along the valve core axis during valve operation, and to prevent the valve core 2 from rotating due to friction between the U-shaped pin 8 and the valve core 2, as follows: Figure 5 As shown, the valve core limiting mechanism adopts the following structure: A mutually cooperating radial limiting surface is provided at the position where the valve core 2 and the clamping nut 4 mate. Thus, the valve core 2 is constrained by the stationary clamping nut 4 through the radial limiting surface, preventing the valve core 2 from rotating due to friction between the pin 8 and the valve core 2. The radial limiting surface refers to the limiting surface that restricts rotational movement (the same applies below). In this embodiment, the radial limiting surface is the tangential surface where the valve core 2 and the clamping nut 4 mate and restrict the rotation of the valve core 2. In other embodiments, the radial limiting surface can be: a protrusion on the cylindrical surface of the valve core 2 and a corresponding groove on the cylindrical surface of the clamping nut 4 that mates with the protrusion; or it can be: a mutually cooperating keyway on the cylindrical surface of the valve core 2 and the clamping nut 4, into which a mating key is inserted, where the radial limiting surface is the surface of the keyway and the surface of the key inserted into the keyway.

[0051] In other embodiments, the valve core limiting mechanism may also adopt the following structure: a mutually cooperating radial limiting surface is provided between the isolation sleeve 3 and the clamping nut 4, and a mutually cooperating radial limiting surface is provided between the isolation sleeve 3 and the valve core 2. In this way, the valve core 2 can be constrained by the stationary clamping nut 4 through the isolation sleeve 3, avoiding rotation due to friction between the pin 8 and the valve core 2, and also achieving the purpose of the present invention.

[0052] In this embodiment, the materials of valve core 2, isolation sleeve 3, and clamping nut 4 are the same as in embodiment 1.

[0053] In other embodiments, when the clamping nut 4 is made of copper alloy, there is no need to set the isolation sleeve 3. The valve core limiting mechanism can directly adopt the following structure: a mutually cooperating radial limiting surface is set between the valve core 2 and the clamping nut 4, which can also achieve the purpose of the present invention.

[0054] Example 3

[0055] like Figure 6 , Figure 7As shown, the difference between this embodiment and Embodiment 1 is that a limiting screw 11 is used instead of a pin structure to achieve a relative rotatable connection between the handwheel 7 and the upper end of the valve core 2, and a axially limited connection along the valve core. Specifically, a limiting screw 11 is provided, a threaded hole is provided on the top of the valve core 2, and a mounting hole is provided in the middle of the handwheel 7 corresponding to the threaded hole. The limiting screw 11 passes through the mounting hole and engages with the threaded hole. The lower surface of the limiting screw 11 and the upper surface of the valve core 2 engage with the handwheel 7, achieving a relative rotatable connection between the handwheel 7 and the upper end of the valve core 2, and a axially limited connection along the valve core. To ensure that the friction between rotating the handwheel 7 and the limiting screw 11 does not cause the limiting screw to rotate and loosen, the thread direction of the limiting screw 11 is opposite to that of the handwheel 7. Alternatively, an anti-loosening mechanism can be provided for the limiting screw, such as an anti-loosening washer, to achieve the purpose of this invention.

[0056] The limit screw 11 can be made of stainless steel, copper alloy, or aluminum alloy. In this embodiment, the limit screw 11 is a consumable part.

[0057] Various embodiments have been described in conjunction with the accompanying drawings. However, it is obvious that various modifications and changes can be made without departing from the scope of the claims to obtain other embodiments, which can also achieve the objectives of the present invention. Other embodiments that achieve the objectives of the present invention in conjunction with the embodiments disclosed in this specification will be apparent to those skilled in the art.

Claims

1. A valve, comprising a valve body, a valve core, a clamping nut, a handwheel, a first sealing ring, a second sealing ring, a third sealing structure, and a valve core limiting mechanism; the clamping nut is threadedly connected to the valve body, and clamps the first sealing ring onto the valve body to achieve a seal between the valve body and the clamping nut; the second sealing ring is disposed at the lower end of the valve core and cooperates with the valve port of the valve body to achieve a valve closure seal; the third sealing structure achieves a seal between the valve core and the clamping nut; the valve core limiting mechanism ensures that the valve core can move axially relative to the clamping nut. Its features are, The handwheel is threaded to the upper end of the clamping nut; the handwheel is rotatable relative to the upper end of the valve core and is axially limited along the valve core.

2. The valve as described in claim 1, characterized in that, It also includes an isolation sleeve, which is fitted onto the upper part of the valve core and engages with the clamping nut; the isolation sleeve and the clamping nut and / or the isolation sleeve and the valve core are in axial movement engagement along the valve core. The materials of the isolation sleeve and the clamping nut are matched to meet the safety requirements for anti-static properties and prevention of environmental combustion and explosion.

3. The valve as described in claim 2, characterized in that, The clamping nut is made of stainless steel, and the isolation sleeve is made of copper alloy.

4. The valve as described in claim 2, characterized in that, The third sealing structure and the valve core limiting mechanism include a bellows, which is fitted onto the valve core. Its lower end is fixedly and sealed to the lower end of the valve core, and its upper end is fixedly and sealed to the clamping nut.

5. The valve as described in claim 1, characterized in that, The clamping nut is made of copper alloy; the valve core limiting mechanism includes a radial limiting surface that cooperates between the valve core and the clamping nut.

6. The valve as described in claim 5, characterized in that, The third sealing structure includes at least one third sealing ring. The portion of the valve core located within the valve cavity of the valve body is provided with a corresponding sealing ring groove. The third sealing ring is fitted into the sealing ring groove and fits tightly with the valve cavity of the valve body to achieve a seal between the valve core and the valve cavity of the valve body.

7. The valve as described in claim 2, characterized in that, The third sealing structure includes at least one third sealing ring. The portion of the valve core located in the valve cavity of the valve body is provided with a corresponding sealing ring groove. The third sealing ring is fitted into the sealing ring groove and fits tightly with the valve cavity of the valve body to achieve a seal between the valve core and the valve cavity of the valve body. The valve core limiting mechanism includes a radial limiting surface that cooperates between the valve core and the clamping nut; Alternatively, the valve core limiting mechanism may include a radial limiting surface that cooperates between the isolation sleeve and the clamping nut, and a radial limiting surface that cooperates between the isolation sleeve and the valve core.

8. The valve as described in any one of claims 1 to 7, characterized in that, The structure of the handwheel being rotatable relative to the upper end of the valve core and axially limited and connected along the valve core is as follows: it includes a pin, the handwheel is provided with a transverse pin hole, and the pin is inserted into the transverse pin hole; the upper end of the valve core includes a T-shaped head, and the pin is fitted into the groove of the T-shaped head, so as to realize that the handwheel and the upper end of the valve core are rotatable relative to each other and axially limited and connected along the valve core; the materials of the pin and the valve core are matched to meet the safety requirements of anti-static and anti-ignition of environmental combustion and explosion.

9. The valve as claimed in claim 8, characterized in that, The pin is made of copper alloy and is either a U-shaped pin or a straight pin.

10. The valve as claimed in any one of claims 1 to 7, characterized in that, The structure of the handwheel being rotatable relative to the upper end of the valve core and axially limited to be connected along the valve core is as follows: it includes a limiting screw, a threaded hole is provided on the top of the valve core, and a mounting hole is provided in the middle of the handwheel corresponding to the threaded hole. The limiting screw passes through the mounting hole and engages with the threaded hole. The lower surface of the limiting screw and the upper surface of the valve core engage with each other with the handwheel, so as to realize that the handwheel and the upper end of the valve core are rotatable relative to each other and axially limited to be connected along the valve core. The thread direction of the limiting screw is opposite to that of the handwheel, or the limiting screw is provided with an anti-loosening mechanism.

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