A detachable high-pressure valve for sealing and locking

Abstract

The present invention relates to a detachable high-pressure valve for sealing and locking, comprising a valve body; an opening and closing structure, the opening and closing structure comprising a valve cover placed in the valve body and a valve stem penetrating the valve cover from top to bottom; when the valve stem descends, the valve disc is driven to seal with the valve seat and multiple flow windows on the valve cage are covered, thereby closing the flow channel and the medium inlet and medium outlet; when the valve stem rises, the valve disc is driven to separate from the valve seat and the multiple flow windows on the valve cage are removed, thereby opening the flow channel and the medium inlet and medium outlet; a driving structure, the driving structure comprising an actuator placed on the upper end of the valve stem and driving the valve stem to rise and fall; a sealing and locking structure, the sealing and locking structure comprising a clamping plate, a bolt pressure plate, a packing and a packing gland. The present invention has the following advantages: it is easy to realize the rapid disassembly and replacement of valve internals, and effectively ensures the sealing and locking performance.

Description

Technical field:

[0002] The invention belongs to the field of valves, and in particular relates to a detachable high-pressure valve capable of achieving sealing and locking. Background technology:

[0004] High-pressure valves have been widely used in the fields of power industry, superhard material manufacturing, chemical industry, petrochemical industry, processing technology, isostatic processing, ultra-high static pressure extrusion, powder metallurgy, metal forming, geophysics, geophysics research, etc. They can be used to control the flow of various types of fluids such as air, water, saturated steam, steam, various corrosive media, mud, oil, liquid metal and radioactive media. High-pressure valves mainly play the role of cutting off, regulating and throttling on pipelines. Due to the widespread use of high-pressure technology, the performance of ultra-high pressure valves in ultra-high pressure systems directly affects the reliability, safety, work efficiency and service life of the entire system. It is particularly important in systems that require frequent pressure increase and pressure relief.

[0005] Existing high-pressure valves have the following defects: 1. When used for a long time or impurities are stuck on the sealing surface, the seal is blown and damaged, resulting in internal leakage. At this time, the valve needs to be cut and replaced with a new valve, beveled, welded, carbon damaged, stress relieved, etc. The valve needs to be replaced many times, which increases the cost and is time-consuming and labor-intensive; 2. The sealing of the medium in the high-pressure valve is mainly achieved through sealing gaskets, self-sealing gaskets and packing. At present, the sealing gaskets and self-sealing gaskets are tightened by tightening the threads of the clamping plate, the valve cover and the valve body. However, the pressure in the valve body generates an upward thrust on the sealing gasket and the self-sealing gasket. Once the threads between the clamping plate, the valve cover and the valve body are loose, the sealing performance of the high-pressure valve is affected; 3. Figure 3 As shown, the packing 73 between the valve cover 51 and the valve stem 52 is compressed by the packing gland 74, and the valve cover 51 is threadedly connected with a bolt pressure plate 72. Both sides of the bolt pressure plate 72 have inwardly recessed grooves 10, and the lower end of the swing bolt 30 is embedded in the corresponding groove 10 and fixedly connected to the bolt pressure plate 72 through the pin 20, and the upper end of the swing bolt 30 passes through the packing gland 74 and is locked by a nut to achieve the compression of the packing gland 74 on the packing 73, and the swing bolt 30 serves to connect the bolt pressure plate 72 and the packing gland 74 on the valve cover 51, but the swing bolt 30 is subjected to upper and lower shear forces during use and is prone to breakage. Once a swing bolt is damaged, the balanced compression force of the packing gland on the packing is affected, causing the packing to leak and affecting the sealing of the high-pressure valve. Summary of the invention:

[0007] The purpose of the present invention is to overcome the above-mentioned deficiencies and provide a detachable high-pressure valve that realizes sealing and locking, so as to facilitate the rapid disassembly and replacement of valve internals and effectively ensure the sealing and locking performance.

[0008] The purpose of the invention is achieved through the following technical solutions: a detachable high-pressure valve that realizes sealing and locking, comprising

[0009] A valve body, wherein the valve body has a flow passage for medium flow, and the valve body also has a medium inlet and a medium outlet for flow with the flow passage;

[0010] An opening and closing structure, the opening and closing structure comprises a valve cover and a valve stem which penetrates the valve cover from top to bottom, the lower end of the valve stem is placed in the flow channel, the flow channel is provided with a valve cage, a valve seat and a spiral wound gasket from top to bottom, the spiral wound gasket is placed between the valve seat and the valve body, the lower end of the valve stem is connected with a valve disc, the valve disc is placed in the valve cage, the lower end of the valve disc is sealed and matched with the valve seat, the outer wall of the valve disc and the inner wall of the valve cage are fitted with each other, and the valve cage is provided with a plurality of flow windows; when the valve stem descends, the valve disc is driven to seal and match with the valve seat and the plurality of flow windows on the valve cage are covered, thereby closing the flow channel and the medium inlet and the medium outlet, and when the valve stem ascends, the valve disc is driven to separate from the valve seat and the plurality of flow windows on the valve cage are removed from being covered, thereby opening the flow channel and the medium inlet and the medium outlet;

[0011] A driving structure, the driving structure includes an actuator disposed at the upper end of the valve stem and driving the valve stem to move up and down;

[0012] A sealing locking structure, which includes a compression plate, a bolt pressure plate, packing and a packing gland. A chamber for embedding packing is provided between the valve cover and the valve stem. The packing gland presses the packing into the chamber and is fixedly connected to the bolt pressure plate by a plurality of stud bolts distributed equicircularly. A chamber for embedding the lower end of the compression plate is provided between the valve cover and the valve body, and the inner side of the valve body is fixedly connected to the outer side of the lower end of the compression plate by a threaded connection. A sealing gasket ring and a self-sealing gasket are also provided between the valve cover and the valve body. The sealing gasket ring and the self-sealing gasket are sleeved on the outside of the valve cover and the sealing gasket ring is tightened against the self-sealing gasket, the valve cover, the valve cage and the spiral wound gasket by a plurality of fastening screws penetrating the compression plate.

[0013] A further improvement of the present invention is that a plurality of anti-loosening screws are passed through the clamping plate, and a limiting groove for the lower ends of the anti-loosening screws to be embedded in the valve body. The anti-loosening screws pass through the clamping plate into the corresponding limiting grooves to achieve fastening of the clamping plate and the valve body.

[0014] A further improvement of the present invention is that the bolt pressure plate is sleeved at the upper end of the valve cover, the bolt pressure plate is a disc-type structure, and the stud bolts penetrate the packing gland and are placed in the bolt pressure plate.

[0015] A further improvement of the present invention is that the upper end of the stud bolt is placed above the packing gland and is threadedly connected with a nut, and the nut is rotated to achieve the packing gland to press the packing, and the stud bolt is placed on the outer circumference between the nut and the packing gland with a tension compensation device.

[0016] A further improvement of the present invention is that the tension compensation device includes an upper elastic body and a lower elastic body, both of which are hollow structures and are fixedly connected to the lower elastic body, the upper elastic body includes an upper cone portion and an upper horizontal portion, the lower elastic body includes a lower cone portion and a lower horizontal portion, the upper horizontal portion and the lower horizontal portion are fixedly connected as a whole, the upper cone portion contacts the lower end surface of the nut, and the lower cone portion contacts the upper end surface of the packing gland.

[0017] A further improvement of the present invention is that a packing pad is provided at the lower end of the packing.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. The present invention uses a T-shaped compression plate detachably connected to a cavity between the valve body and the valve cover through a thread to achieve pre-tightening of the self-sealing gasket and the sealing gasket ring, and uses a plurality of vertically penetrating fastening screws on the compression plate to achieve re-tightening of the self-sealing gasket and the sealing gasket ring between the valve body and the valve cover, thereby ensuring the sealing performance in the valve body; the packing gland is connected and fixed to the bolt pressure plate by a plurality of stud bolts, and a disc-type bolt pressure plate and a stud bolt structure are used to replace the traditional bolt pressure plate and live bolt connection form, thereby ensuring the connection stability between the stud bolt and the bolt pressure plate, ensuring the stable force balance during connection, and avoiding the packing gland from tilting sideways to cause packing leakage.

[0020] 2. The clamping plate is pre-tightened in the cavity of the valve body and the valve cover by means of threaded connection. After the self-sealing gasket and the sealing gasket ring are positioned and tightened by the tightening screws, the clamping plate is penetrated into the limiting groove of the valve body by the anti-loosening screws, which further ensures the connection stability between the clamping plate and the valve body, avoids the loosening of the clamping plate and ensures the internal sealing. This connection form is convenient for quick disassembly. When the seal in the valve body is blown out, it is convenient to quickly replace the valve internal parts.

[0021] 3. A tension compensation device is arranged between the nut of the stud bolt and the packing gland. The tension compensation device bears the load deformation under the tightening action of the nut and reserves a certain potential energy. When the packing is subjected to the pressure fluctuation in the valve, the packing gland will float to a certain extent. At this time, the tension compensation device releases part of the potential energy to keep the packing gland pressed tightly, which plays a better tension compensation role, thereby ensuring the stable pressing force of the packing gland on the packing. Description of the drawings:

[0023] Figure 1 The present invention is a structural schematic diagram of a detachable high-pressure valve that realizes sealing and locking.

[0024] Figure 2 for Figure 1 Schematic diagram of the structure of the tension compensation device.

[0025] Figure 3 It is a schematic diagram of the connection between the existing packing gland and the bolt pressure plate in the background technology and a schematic diagram of the structure of the bolt pressure plate.

[0026] Numbers in the figure:

[0027] 1-valve body, 2-flow channel, 3-medium inlet, 4-medium outlet, 5-opening and closing structure, 6-driving structure, 7-sealing and locking structure;

[0028] 51-valve cover, 52-valve stem, 53-valve cage, 54-valve seat, 55-valve disc, 56-flow window, 57-wound gasket;

[0029] 61-actuator;

[0030] 71-pressure plate, 72-bolt pressure plate, 73-packing, 74-packing gland, 75-chamber, 76-stud bolt, 78-chamber, 79-sealing ring, 710-self-sealing pad, 711-fastening screw, 713-anti-loosening screw, 714-limiting groove, 715-packing pad; 716-tension compensation device, 717-nut;

[0031] 7161 - upper elastic body, 7162 - lower elastic body, 7163 - upper cone portion, 7164 - upper horizontal portion, 7165 - lower cone portion, 7166 - lower horizontal portion. Specific implementation method:

[0033] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0034] In the description of the present invention, it is necessary to understand that terms indicating orientation or positional relationships, such as orientation or positional relationships based on the drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure or unit referred to must have a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0035] In the present invention, unless otherwise clearly stipulated and limited, terms such as "connected", "provided with", "having" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be said to be a mechanical connection, or it can be directly connected, or it can be connected through an intermediate medium. For those skilled in the art, the basic meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0036] like Figure 1 An embodiment of the present invention for realizing a sealed and locked detachable high-pressure valve is shown, comprising:

[0037] A valve body 1, wherein the valve body 1 has a flow channel 2 for medium flow, and the valve body 1 also has a medium inlet 3 and a medium outlet 4 for flow with the flow channel 2;

[0038] An opening and closing structure 5, the opening and closing structure 5 includes a valve cover 51 and a valve stem 52 that penetrates the valve cover 51 from top to bottom, the lower end of the valve stem 52 is placed in the flow channel 2, and the flow channel 2 has a valve cage 53, a valve seat 54 and a spiral wound gasket 57 from top to bottom, the spiral wound gasket 57 is placed between the valve seat 54 and the valve body 1, the lower end of the valve stem 52 is connected to a valve flap 55, the valve flap 55 is placed in the valve cage 53, and the lower end of the valve flap 55 is sealed and matched with the valve seat 54, and the outer wall of the valve flap 55 is connected to the valve cage The inner walls of the valve cage 53 fit each other, and the valve cage 53 has a plurality of flow windows 56; when the valve stem 52 descends, the valve flap 55 is driven to seal and match the valve seat 54, and the plurality of flow windows 56 on the valve cage 53 are covered, thereby closing the flow channel 2 and the medium inlet 3 and the medium outlet 4; when the valve stem 52 ascends, the valve flap 55 is driven to separate from the valve seat 54, and the plurality of flow windows 56 on the valve cage 53 are removed from being covered, thereby opening the flow channel 2 and the medium inlet 3 and the medium outlet 4;

[0039] A driving structure 6, the driving structure 6 includes an actuator 61 disposed at the upper end of the valve stem 52 and driving the valve stem 52 to move up and down;

[0040] A sealing locking structure 7, which includes a clamping plate 71, a bolt pressure plate 72, a packing 73 and a packing gland 74. A chamber 75 for embedding the packing 73 is provided between the valve cover 51 and the valve stem 52. The packing gland 74 presses the packing 73 into the chamber 75 and is fixedly connected to the bolt pressure plate 72 through a plurality of stud bolts 76 distributed equicircularly. A cavity 78 for embedding the lower end of the clamping plate 71 is provided between the valve cover 51 and the valve body 1, and the inner side of the valve body 1 is fixedly connected to the outer side of the lower end of the clamping plate 71 in a threaded manner. A sealing gasket ring 79 and a self-sealing gasket 710 distributed up and down are also provided between the valve cover 51 and the valve body 1. The sealing gasket ring 79 and the self-sealing gasket 710 are sleeved on the outside of the valve cover 51 and the sealing gasket ring 79 is tightened against the self-sealing gasket 710, the valve cover 51, the valve cage 53 and the spiral wound gasket 57 through a plurality of fastening screws 711 penetrating the clamping plate 71.

[0041] Furthermore, a plurality of anti-loosening screws 713 are provided through the clamping plate 71, and a limiting groove 714 is provided on the valve body 1 for the lower end of the anti-loosening screw 713 to be embedded. The anti-loosening screw 713 passes through the clamping plate 71 to the corresponding limiting groove 714 to fix the position of the clamping plate 71 and the valve body 1.

[0042] The present invention has a T-shaped clamping plate 71 detachably connected by thread in the cavity 78 between the valve body 1 and the valve cover 51 to achieve pre-tightening of the self-sealing gasket 710 and the sealing gasket ring 79, and the clamping plate 71 is provided with a plurality of vertically penetrating fastening screws 711 to achieve re-tightening of the self-sealing gasket 710 and the sealing gasket ring 79 between the valve body 1 and the valve cover 51, thereby ensuring the sealing performance in the valve body 1; the packing gland 74 is connected and fixed to the bolt pressure plate 72 by a plurality of stud bolts 76, and the structure of the disc-type bolt pressure plate 72 and the stud bolts 76 are adopted to replace the traditional connection form of the bolt pressure plate and the movable bolt, thereby ensuring the connection stability between the stud bolts 76 and the bolt pressure plate 72, ensuring the stable force balance during connection, and avoiding the phenomenon of the side warping of the packing gland 74 causing packing leakage.

[0043] Moreover, the clamping plate 71 is pre-tightened in the cavity 78 of the valve body 1 and the valve cover 51 by means of a threaded connection. After the self-sealing gasket 710 and the sealing gasket ring 79 are positioned and tightened by the tightening screws 711, the anti-loosening screws 713 are passed through the clamping plate 71 to the limiting groove 714 of the valve body 1, thereby further ensuring the connection stability between the clamping plate 71 and the valve body 1, avoiding the loosening of the clamping plate 71 and ensuring the internal sealing. This form of connection facilitates quick disassembly, and when the seals in the valve body are blown out, it is convenient to quickly replace the valve internals.

[0044] Furthermore, the bolt pressure plate 72 is sleeved on the upper end of the valve cover 51 . The bolt pressure plate 72 is a disc-shaped structure. The stud bolts 76 penetrate the packing gland 74 and are placed in the bolt pressure plate 72 .

[0045] Furthermore, the upper end of the stud bolt 76 is placed above the packing gland 74 and is threadedly connected with a nut 717. The nut 717 is rotated to achieve the compression of the packing gland 74 on the packing 73. The stud bolt 76 is placed on the outer circumference between the nut 717 and the packing gland 74 and has a tension compensation device 716.

[0046] In this application, if Figure 2 As shown, the specific structure of the tension compensation device 716 is: the tension compensation device 716 includes an upper elastic body 7161 and a lower elastic body 7162, the upper elastic body 7161 and the lower elastic body 7162 are both hollow structures and the upper elastic body 7161 and the lower elastic body 7162 are fixedly connected, the upper elastic body 7161 includes an upper cone portion 7163 and an upper horizontal portion 7164, the lower elastic body 7162 includes a lower cone portion 7165 and a lower horizontal portion 7166, the upper horizontal portion 7165 and the lower horizontal portion 7166 are fixedly connected as a whole, the upper cone portion 7163 contacts the lower end surface of the nut 717, and the lower cone portion 7165 contacts the upper end surface of the packing gland 74.

[0047] A tension compensation device 716 is arranged between the nut 717 of the stud bolt 76 and the packing gland 74. The tension compensation device 716 is deformed under the load under the tightening action of the nut 717 and reserves a certain potential energy. When the packing 73 is subjected to the pressure fluctuation in the valve and the packing gland 74 produces a certain floating, the tension compensation device 716 releases part of the potential energy to keep the packing gland 74 pressed tightly, thereby playing a better tension compensation role, thereby ensuring the stable pressing force of the packing gland 74 on the packing 73.

[0048] Furthermore, a packing pad 715 is provided at the lower end of the packing 73 .

[0049] The contents not fully disclosed in the present invention are common knowledge known to those skilled in the art. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A detachable high-pressure valve for sealing and locking, characterized in that: include A valve body, wherein the valve body has a flow channel for medium flow, and the valve body also has a medium inlet and a medium outlet communicating with the flow channel; An opening and closing structure, the opening and closing structure comprises a valve cover and a valve stem penetrating the valve cover from top to bottom, the lower end of the valve stem is placed in a flow channel, the flow channel is provided with a valve cage, a valve seat and a spiral wound gasket from top to bottom, the spiral wound gasket is placed between the valve seat and the valve body, the lower end of the valve stem is connected with a valve disc, the valve disc is placed in the valve cage, and the lower end of the valve disc is sealed and matched with the valve seat, the outer wall of the valve disc and the inner wall of the valve cage are fitted with each other, and the valve cage is provided with a plurality of flow windows; when the valve stem descends, the valve disc is driven to seal and match with the valve seat and the plurality of flow windows on the valve cage are covered, thereby closing the flow channel and the medium inlet and the medium outlet; when the valve stem ascends, the valve disc is driven to separate from the valve seat and the plurality of flow windows on the valve cage are removed, thereby opening the flow channel and the medium inlet and the medium outlet; A driving structure, the driving structure comprising an actuator disposed at the upper end of the valve stem and driving the valve stem to move up and down; A sealing locking structure, the sealing locking structure comprises a clamping plate, a bolt pressure plate, a packing and a packing gland, a cavity for packing to be embedded is provided between the valve cover and the valve stem, the packing gland presses the packing into the cavity and is fixedly connected to the bolt pressure plate through a plurality of stud bolts distributed equicircumferentially, a cavity for the lower end of the clamping plate to be embedded is provided between the valve cover and the valve body, and the inner side of the valve body is fixedly connected to the outer side of the lower end of the clamping plate in a threaded manner, and a sealing gasket ring and a self-sealing gasket distributed up and down are also provided between the valve cover and the valve body, the sealing gasket ring and the self-sealing gasket are sleeved on the outside of the valve cover, and the sealing gasket ring is tightened against the self-sealing gasket, the valve cover, the valve cage and the spiral wound gasket by a plurality of fastening screws penetrating the clamping plate; A plurality of anti-loosening screws are passed through the clamping plate, and the valve body is provided with a limiting groove in which the lower end of the anti-loosening screw is embedded, and the anti-loosening screw passes through the clamping plate to the corresponding limiting groove to fix the position of the clamping plate and the valve body; the bolt pressure plate is sleeved on the upper end of the valve cover, and the bolt pressure plate is a disc-type structure, and the stud bolt passes through the packing gland and is placed in the bolt pressure plate; the upper end of the stud bolt is placed above the packing gland and is threadedly connected with a nut, and the nut is rotated to realize the packing gland to press the packing, and the stud bolt is placed between the nut and the packing gland and has a tension compensation device on its outer circumference; The tension compensation device includes an upper elastic body and a lower elastic body, both of which are hollow structures and are fixedly connected to each other. The upper elastic body includes an upper cone portion and an upper horizontal portion, and the lower elastic body includes a lower cone portion and a lower horizontal portion. The upper horizontal portion and the lower horizontal portion are fixedly connected as a whole, the upper cone portion contacts the lower end surface of the nut, and the lower cone portion contacts the upper end surface of the packing gland.

2. A detachable high-pressure valve for sealing and locking according to claim 1, characterized in that: The lower end of the packing is provided with a packing pad.

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