Elastic sealing ball valve

Abstract

The utility model provides an elastic sealing ball valve which comprises a valve cover, a valve seat and a valve element, a positioning piece is arranged between the valve cover and the valve element, a first static electricity removing elastic piece is arranged between the valve cover and the positioning piece, a second static electricity removing elastic piece is arranged between the valve element and the positioning piece, and a compensation elastic piece is arranged between the valve cover and the valve seat. The compensation elastic piece drives the valve seat to abut against the valve element, a first sealing piece is arranged on the side, close to the valve element, of the valve seat, an installation space used for installing the first sealing piece is formed in the valve seat, and a second sealing part is further arranged on the valve seat. Two seals are arranged, flexible sealing is achieved, meanwhile, when a fire occurs, under the action of the compensation elastic piece, metal sealing is immediately switched, and leakage of the valve is prevented; meanwhile, different parts of the valve are connected to be in a conducting state through the first static electricity removing elastic piece and the second static electricity removing elastic piece, and the situation that different parts carry different charges to generate static electricity is avoided.

Description

Technical Field

[0001] This utility model relates to the field of valve technology for chemical applications, and in particular to a resilient sealing ball valve. Background Technology

[0002] A ball valve is a type of valve in which the opening and closing element, namely a ball, is driven by the valve stem and rotates around the valve axis. It has advantages such as excellent flow performance and wide range of applications. In the chemical industry, ball valves are often used to control the opening and closing of pipelines. In the chemical industry, there are high requirements for sealing and static electricity control. In order to enhance the sealing performance, some parts of the ball valve structure will use elastic sealing materials such as rubber. This makes some areas soft seals. Soft seals can lead to the generation of static electricity. In severe cases, static electricity can cause fires or even explosions in the plant or raw materials.

[0003] Chinese utility model patent application CN202122756984.4 discloses a cryogenic floating ball valve, comprising a valve body, a valve cover, a rear valve seat, a ball, an upper sleeve, and a valve stem. The valve cover is mounted on both ends of the valve body via fully threaded studs, and a ball is installed inside the valve body. An anti-static spring connected to the rear valve seat is located below the ball. The left side of the ball contacts the front valve seat mounted on the valve cover, and the right side of the ball contacts the rear valve seat mounted on the valve cover. An upper sleeve is bolted to the middle of the upper end of the valve body. A packing assembly is installed at the connection between the upper end of the upper sleeve and the valve stem, and a packing pressure sleeve is fitted onto the valve stem above the packing assembly. In this cryogenic floating ball valve, an energy storage ring is used to achieve a seal between the valve body and the back of the rear valve seat. The pre-tightening compensation force of the spring assembly inside the energy storage ring ensures a reliable seal between the valve body and the back of the rear valve seat. A helical spring provides support for the ball and a low-pressure pre-tightening sealing force for the rear valve seat.

[0004] While this technology enhances sealing and prevents static electricity, it is less effective at protecting against fires caused by internal static electricity than against fires spreading from the outside. Therefore, a new technical approach is needed to address this issue. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by providing a resilient sealing ball valve. By setting two seals, it achieves flexible sealing while immediately switching to metal sealing in the event of a fire under the action of the compensating elastic element to prevent valve leakage. At the same time, by using two antistatic elastic elements, the different components of the valve are connected in a conductive state, avoiding the generation of static electricity due to different components carrying different charges.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] The utility model provides a kind of elastic sealing ball valve, including bonnet, valve seat and valve core, the positioning member is provided between the bonnet and the valve core, the static electricity removing elastic member one is provided between the bonnet and the positioning member, the static electricity removing elastic member two is provided between the valve core and the positioning member, the compensation elastic member is provided between the bonnet and the valve seat, the compensation elastic member drives the valve seat to abut against the valve core, the valve seat is equipped with first sealing element on the side close to the valve core, installation space for installing first sealing element is opened in the valve seat, second sealing portion is also equipped on the valve seat;When fire occurs, first sealing element burns and loses, compensation elastic member drives valve seat to abut against valve core, so that second sealing portion is in contact with valve core sealing.

[0008] According to one embodiment of the utility model, the first sealing element is flexible.

[0009] According to one embodiment of the utility model, the first sealing element is in contact with the valve core, and the second sealing portion is not in contact with the valve core.

[0010] According to one embodiment of the utility model, the valve seat comprises at least one step portion one in a direction away from the valve core, the compensation elastic member comprises at least one step portion two, the step portion one and the step portion two are complementary in shape and cooperate with each other to realize sealing of the valve seat and the compensation elastic member during compensation movement.

[0011] According to one embodiment of the utility model, the compensation elastic member comprises at least one step portion three in a direction away from the step portion two, the bonnet comprises at least one step portion four, the step portion three and the step portion four are complementary in shape and cooperate with each other to realize sealing of the compensation elastic member and the bonnet during compensation movement.

[0012] According to one embodiment of the utility model, a sealing ring is arranged between the compensation elastic member and the valve seat.

[0013] According to one embodiment of the utility model, the elastic movement direction of the compensation elastic member is the same as the opening and closing direction controlled by the valve core.

[0014] According to one embodiment of the utility model, an auxiliary sealing element is further arranged between the bonnet and the valve seat.

[0015] According to one embodiment of the utility model, the auxiliary sealing element is arranged away from the compensation elastic member, and the elastic direction of the auxiliary sealing element is opposite to the elastic direction of the compensation elastic member.

[0016] According to one embodiment of the utility model, the auxiliary sealing element is an O-ring.

[0017] The utility model discloses a beneficial effect lies in:

[0018] (1) the utility model discloses a setting two seals realizes flexible sealing, and when the fire occurs, under the action of compensation elastic part, immediately switch to metal seal, prevent the valve from leaking.

[0019] (2) the utility model discloses a setting compensation elastic part further improves the sealing performance in the valve use process, avoids the leakage when valve seat moves.

[0020] (3) the utility model discloses a metal curved surface plays the close contact effect, further strengthens the effect of isolating the fire transmission in pipeline.

[0021] (4) the utility model discloses a setting static electricity removal elastic part one 11 and static electricity removal elastic part two 31 connect the parts of valve as the whole structure, avoid the different charge between different structures, cause static electricity, influence safety production.

[0022] Summarized above, the utility model has the advantages such as antistatic, multiple fireproofing. DRAWINGS

[0023] Figure 1 It is structure schematic diagram for the utility model;

[0024] Figure 2 It is Figure 1 Enlarged structure schematic diagram of A place in;

[0025] Figure 3 It is Figure 1 Enlarged structure schematic diagram of B place in; SPECIFIC EMBODIMENT

[0026] The technical scheme in the utility model embodiment will be described clearly and completely below in conjunction with the drawings in the utility model embodiment, and obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the range of the utility model protection.

[0027] In the description of the utility model, it is understood that the directions or positional relations indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" are based on the directions or positional relations shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model in that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0028] Embodiment one

[0029] As Figure 1 shown, the embodiment provides a flexible sealing ball valve, which comprises a valve cover 1, a valve seat 2 and a valve core 3, a positioning piece 4 is arranged between the valve cover 1 and the valve core 3, an electrostatic elimination elastic piece one 11 is arranged between the valve cover 1 and the positioning piece 4, an electrostatic elimination elastic piece two 31 is arranged between the valve core 3 and the positioning piece 4,

[0030] A compensation elastic piece 5 is arranged between the valve cover 1 and the valve seat 2, a plurality of springs are uniformly distributed between the valve cover 1 and the compensation elastic piece 5 in the circumferential direction, so that the compensation elastic piece 5 drives the valve seat 2 to abut against the valve core 3, the valve seat 2 is provided with a first sealing piece 22 on the side close to the valve core 3, the valve seat 2 is provided with a mounting space 23 for mounting the first sealing piece, and the valve seat 2 is further provided with a second sealing part 221.

[0031] When a fire occurs, the first sealing piece 22 is burned out, the compensation elastic piece 5 drives the valve seat 2 to abut against the valve core 3, so that the second sealing part 221 is in contact with the valve core for sealing.

[0032] It should be noted that the electrostatic elimination elastic piece one 11 and the electrostatic elimination elastic piece two 31 connect the components of the valve as a whole structure, avoid different structures to form different charges, cause static electricity, affect the safety production.

[0033] In the embodiment, the first sealing piece 22 is a flexible sealing, preferably a plastic sealing with self-compensation function.

[0034] The first sealing element 22 contacts and seals the valve core 3, while the second sealing part 221 does not contact the valve core. It should be noted that during normal use, the first sealing element serves as the primary sealing method. In the event of a fire, the first sealing element 22, made of plastic, is easily burned. Under the push of the compensating elastic element 5, the valve seat 2 abuts against the valve core, causing the second sealing part 221 on the valve seat to contact the valve core, achieving a metal seal and preventing valve failure due to fire.

[0035] It should be noted that, in this embodiment, a valve stem is fixedly connected to one side of the valve core 3, and the valve stem controls the rotation of the valve core 3 to control the overall opening and closing state.

[0036] Furthermore, the valve seat 2 includes at least one stepped portion 24 in the direction away from the valve core 3, and the compensating elastic member 5 includes at least one stepped portion 51. The stepped portions 24 and 51 are complementary in shape and thus cooperate with each other to achieve sealing between the valve seat 2 and the compensating elastic member 5 during the compensating movement. In this embodiment, the stepped portion 24 and the stepped portion 51 are interlocked.

[0037] A sealing ring 6 is provided between the compensating elastic element 5 and the valve seat 2. It should be noted that the sealing ring 6 is a flexible graphite seal, which improves the fire resistance rating.

[0038] The compensating elastic member 5 includes at least one stepped portion 3 52 in the direction away from the stepped portion 2 51, and the valve cover 1 includes at least one stepped portion 4 12. The stepped portions 3 52 and 4 12 are complementary in shape and thus cooperate with each other to achieve sealing of the compensating elastic member 5 and the valve cover 1 during the compensating movement. In this embodiment, the stepped portion 3 52 and the stepped portion 4 12 are interlocked.

[0039] It should be noted that step part 1 24 and step part 2 51 form the first compensation area, and step part 3 52 and step part 4 12 form the second compensation area. The two compensation areas work together to ensure that the curved surface 221 of the compensation part 22 fits with the valve core 3, thereby keeping the installation space 23 in an isolated state.

[0040] It should be noted that the two compensation zones work together to prevent the medium from bypassing the valve core 3 from the gaps between the multiple stepped sections.

[0041] Example 2

[0042] like Figure 2 As shown, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 2 and Embodiment 1 is as follows:

[0043] The elastic movement direction of the compensating elastic element 5 is the same as the opening and closing direction controlled by the valve core 3.

[0044] An auxiliary sealing member 7 is further arranged between the valve cover 1 and the valve seat 2.

[0045] The auxiliary sealing member 7 is arranged away from the compensation elastic member 5, and the elastic direction of the auxiliary sealing member 7 is opposite to the elastic direction of the compensation elastic member 5. In this embodiment, the auxiliary sealing member 7 is an O-shaped ring, which is suitable for a dynamic sealing environment, and can easily convert the stress into elastic force in various directions, effectively absorbing vibration and impact.

[0046] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An elastomeric seal ball valve comprising a bonnet, a valve seat and a valve plug, characterized in that, The valve cover and the valve core are provided with a positioning member, the valve cover and the positioning member are provided with an electrostatic elimination elastic member one, the valve core and the positioning member are provided with an electrostatic elimination elastic member two, The valve cover and the valve seat are provided with a compensation elastic member, the compensation elastic member drives the valve seat to abut against the valve core, the valve seat is provided with a first sealing member on the side close to the valve core, the valve seat is provided with a mounting space for mounting the first sealing member, and the valve seat is further provided with a second sealing part; When a fire occurs, the first sealing member is burned out, the compensation elastic member drives the valve seat to abut against the valve core, and the second sealing part is in contact with the valve core.

2. A resilient seated ball valve according to claim 1, wherein, The first sealing member is a flexible sealing member.

3. A resilient seated ball valve according to claim 1, wherein, The first sealing member is in contact with the valve core, and the second sealing part is not in contact with the valve core.

4. A resilient seated ball valve according to claim 1, wherein, The valve seat comprises at least one step part one in the direction away from the valve core, the compensation elastic member comprises at least one step part two, and the step part one and the step part two are complementary in shape and matched with each other to realize sealing of the valve seat and the compensation elastic member during compensation movement.

5. A resilient seated ball valve according to claim 4, wherein, The compensation elastic member comprises at least one step part three in the direction away from the step part two, the valve cover comprises at least one step part four, and the step part three and the step part four are complementary in shape and matched with each other to realize sealing of the compensation elastic member and the valve cover during compensation movement.

6. A resilient seated ball valve according to claim 1, wherein, The compensation elastic member and the valve seat are provided with a sealing ring.

7. A resilient seated ball valve according to claim 1, wherein, The elastic movement direction of the compensation elastic member is the same as the opening and closing direction controlled by the valve core.

8. A resilient seated ball valve according to claim 7, wherein, The valve cover and the valve seat are further provided with an auxiliary sealing member.

9. A resilient seated ball valve according to claim 8, wherein, The auxiliary sealing member is arranged away from the compensation elastic member, and the elastic direction of the auxiliary sealing member is opposite to the elastic direction of the compensation elastic member.

10. A resilient seated ball valve according to claim 8, wherein, The auxiliary sealing member is an O-shaped ring.

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