Bidirectional hard sealing floating titanium alloy ball valve

Abstract

The utility model discloses a bidirectional hard sealing floating titanium alloy ball valve, which belongs to the technical field of titanium alloy ball valves, and comprises a valve body, a left valve body, a valve seat, a ball valve and a right valve body, the valve seat and the ball valve are arranged in a valve cavity defined by the left valve body and the right valve body in a combined mode, and bidirectional hard sealing floating assemblies are arranged in the valve seat, the left valve body and the right valve body. Through mutual cooperation of the groove, the spring, the sealing gasket, the graphite sealing ring and the pressing seat, the valve can keep good sealing performance during bidirectional flowing, and the problem that the elasticity of a traditional titanium alloy ball valve is attenuated due to the fact that the graphite sealing ring is directly pressed through the spring for a long time is solved; and the ball body is pushed to be in close contact with the valve seat through the pressure of a medium, so that the graphite sealing ring is pressed, the pressure load of the spring is effectively dispersed, and the sealing failure risk caused by spring elasticity attenuation is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of titanium alloy ball valves, and more specifically to a bidirectional hard-sealed floating titanium alloy ball valve. Background Art

[0002] Titanium alloy ball valve is a valve equipment made by utilizing the excellent physical and chemical properties of titanium and titanium alloys. Because titanium and titanium alloys have the advantages of high strength, strong corrosion resistance and good heat resistance, titanium alloy ball valve is widely used in special working conditions such as high temperature and high pressure, strong acid and alkali, seawater desalination, aerospace, etc.

[0003] When the titanium alloy ball valve is in use, the staff usually turns the valve stem with the help of a handle, electric or pneumatic actuator. The valve stem drives the ball valve to rotate. When the ball valve rotates to a certain angle (usually 90 degrees), the channel inside the ball valve is aligned with the inlet and outlet of the valve. At this time, the valve is fully open and the fluid can pass through the valve without obstruction. Otherwise, it can be closed, and the graphite sealing ring is compressed by a spring in the valve seat to ensure the sealing performance.

[0004] In actual use of the prior art, traditional titanium alloy ball valves use springs to compress graphite sealing rings during long-term use. Since the springs are under stress for a long time, the elastic force will gradually decay over time, which can easily lead to a decrease in the sealing performance of the valve, thereby causing internal leakage. Therefore, a bidirectional hard-sealed floating titanium alloy ball valve is proposed. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] In view of the problems existing in the prior art, the utility model provides a bidirectional hard-seal floating titanium alloy ball valve, which, through the mutual cooperation of grooves, springs, sealing gaskets, graphite sealing rings and pressure seats, can enable the valve to maintain good sealing performance in bidirectional flow, avoiding the problem of elastic force attenuation caused by long-term direct compression of the graphite sealing ring by the spring in traditional titanium alloy ball valves, and allowing the ball to be pushed into close contact with the valve seat through the medium's own pressure, thereby compressing the graphite sealing ring to effectively disperse the pressure load of the spring, reducing the risk of sealing failure due to spring elastic force attenuation.

[0007] 2. Technical solution

[0008] To solve the above problems, the utility model adopts the following technical solutions.

[0009] A bidirectional hard-sealed floating titanium alloy ball valve comprises a valve body, a left valve body, a valve seat, a ball valve and a right valve body, wherein the valve body is formed by combining the left valve body and the right valve body, the valve seat and the ball valve are arranged in a valve cavity surrounded by the left valve body and the right valve body, a valve stem is arranged inside the ball valve, a bidirectional hard-sealed floating assembly is arranged inside the valve seat, the left valve body and the right valve body, and a valve stem protection assembly is arranged on the outer surface of the valve stem; the bidirectional hard-sealed floating assembly comprises grooves opened inside the valve seat, the left valve body and the right valve body, graphite sealing rings are arranged inside two of the grooves, and pressure seats are movably connected to the outer surfaces of the two graphite sealing rings; the valve stem protection assembly comprises a connecting block arranged on the outer surface of the valve stem, a packing gland is clamped on the outer surface of the connecting block, and a graphite packing is arranged between the valve stem and the valve stem.

[0010] Furthermore, a sealing cover is movably connected to the outer surface of the valve stem, and an anti-slip cover is sleeved and connected to the outer surface of the sealing cover.

[0011] Furthermore, a retaining ring is provided on the outer surface of the valve stem, and the lower surface of the retaining ring is movably connected to the packing gland.

[0012] Furthermore, a plurality of springs are fixedly connected to the outer surface of the pressure seat, and the other ends of the springs are connected to the inside of the groove.

[0013] Furthermore, sealing rings are provided inside the left valve body and the right valve body, and the thickness of the sealing rings is between two centimeters and five centimeters.

[0014] Furthermore, a sealing gasket is provided below the graphite filler and on the outer surface of the valve stem, and the thickness of the sealing gasket is one centimeter.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] (1) This solution achieves good sealing performance in bidirectional flow through the coordination of grooves, springs, gaskets, graphite sealing rings and pressure seats, avoiding the problem of elastic force attenuation caused by long-term direct compression of the graphite sealing ring by the spring in traditional titanium alloy ball valves. The ball is pushed into close contact with the valve seat by the medium's own pressure, thereby compressing the graphite sealing ring to effectively disperse the pressure load of the spring and reduce the risk of sealing failure caused by spring elastic force attenuation. When the valve is closed, the ball fits tightly against the valve seat, and the graphite sealing ring and spring form a strong sealing effect to effectively prevent medium leakage. When the valve cavity pressure rises abnormally, it can also play the role of automatic pressure relief, avoiding damage to the valve due to overpressure, thereby achieving bidirectional efficient sealing and automatic pressure relief protection.

[0018] (2) This solution can effectively prevent leakage of media between the valve stem and the valve body through the mutual cooperation of the graphite packing, packing gland and sealing gasket, so as to enhance its sealing performance. Furthermore, the mutual cooperation of the packing gland and the connecting block will exert pressure on the graphite packing below, so that it is tightly wrapped around the valve stem to form a good seal. At the same time, the mutual cooperation of the sealing cover can prevent external impurities from entering, and the sealing cover plays a certain guiding and supporting role when the valve stem moves, which can ensure that the graphite packing and the packing gland remain stable when the valve stem moves, avoiding the problems of packing deviation and dislocation caused by the movement of the valve stem. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a side view of the overall structure of the utility model;

[0021] Figure 3 It is a partial structural cross-sectional view of the utility model as a whole;

[0022] Figure 4 For this utility model Figure 3 The enlarged view of point A in the middle;

[0023] Figure 5 This utility model Figure 3 The enlarged view of point B in the middle;

[0024] Figure 6 It is a partial structural exploded view of the bidirectional hard seal floating assembly of the utility model.

[0025] Description of the numbers in the figure:

[0026] 1. Valve body; 101. Left valve body; 102. Right valve body; 103. Valve seat; 104. Ball valve; 105. Valve stem;

[0027] 2. Bidirectional hard seal floating assembly; 201. groove; 202. graphite seal ring; 203. pressure seat; 204. spring; 205. seal ring;

[0028] 3. Valve stem protection assembly; 301. Retaining ring; 302. Packing gland; 303. Graphite packing; 304. Sealing gasket; 305. Sealing cover; 306. Connecting block. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] Example 1

[0033] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 , is the first embodiment of the utility model, which provides a bidirectional hard-sealed floating titanium alloy ball valve, including a valve body 1, a left valve body 101, a valve seat 103, a ball valve 104 and a right valve body 102. The valve body 1 is composed of a left valve body 101 and a right valve body 102. The valve seat 103 and the ball valve 104 are arranged in a valve cavity surrounded by the left valve body 101 and the right valve body 102. A valve stem 105 is arranged inside the ball valve 104, and a bidirectional hard-sealed floating assembly 2 is arranged inside the valve seat 103, the left valve body 101 and the right valve body 102.

[0034] Specifically, the bidirectional hard-sealed floating assembly 2 includes grooves 201 opened in the valve seat 103, the left valve body 101 and the right valve body 102, graphite sealing rings 202 are arranged inside the two grooves 201, and the outer surfaces of the two graphite sealing rings 202 are movably connected with pressure seats 203, and the outer surfaces of the pressure seats 203 are fixedly connected with multiple springs 204, and the other ends of the springs 204 are connected to the inside of the grooves 201, and sealing rings 205 are arranged inside the left valve body 101 and the right valve body 102.

[0035] Furthermore, due to the existence of fluid pressure, the contact pressure of the graphite sealing rings 202 on both sides of the ball valve 104 and the valve seat 103 is balanced, so that the valve can maintain good sealing performance during bidirectional flow, avoiding the problem of elastic force attenuation caused by the traditional titanium alloy ball valve directly pressing the graphite sealing ring 202 through the spring 204 for a long time. When closing the valve, the valve stem 105 is rotated again to rotate the ball valve 104 to contact and press the sealing surface on the valve seat 103. Through the medium pressure and the characteristics of the graphite sealing ring 202 itself, a strong sealing effect is formed. Further, through the cooperation of the spring 204, the valve seat 103 and the ball valve 104 maintain initial contact when the valve is not working, which helps the valve seat 103 to quickly and accurately fit the spherical surface when the valve is opened and closed, providing the necessary compensation force, and further enhancing the sealing performance of the valve when it is closed.

[0036] Example 2

[0037] Reference Figure 1 , Figure 2 , Figure 3 and Figure 5 , which is the second embodiment of the utility model. This embodiment is based on the previous embodiment. The valve body 1 is composed of a left valve body 101 and a right valve body 102. The valve seat 103 and the ball valve 104 are arranged in the valve cavity surrounded by the left valve body 101 and the right valve body 102. A valve stem 105 is arranged inside the ball valve 104, and a valve stem protection component 3 is arranged on the outer surface of the valve stem 105.

[0038] Specifically, the valve stem protection assembly 3 includes a connecting block 306 arranged on the outer surface of the valve stem 105, the outer surface of the connecting block 306 is clamped with a stuffing cover 302, a graphite packing 303 is arranged between the valve stem 105 and the valve stem 105, the outer surface of the valve stem 105 is movably connected with a sealing cover 305, the outer surface of the valve stem 105 is provided with a retaining ring 301, the lower surface of the retaining ring 301 is movably connected to the stuffing cover 302, and a sealing gasket 304 is arranged below the graphite packing 303 and on the outer surface of the valve stem 105.

[0039] Furthermore, when the valve stem 105 moves, the sealing cover 305 plays a certain guiding and supporting role, which can ensure that the graphite packing 303 and the packing gland 302 remain stable when the valve stem 105 moves, and avoid the problems of packing deflection and dislocation caused by the movement of the valve stem 105, thereby maintaining the sealing contact between the graphite packing 303 and the packing gland 302 and the valve stem 105, and ensuring the sealing effectiveness of the valve when opening and closing. The mutual cooperation between the retaining ring 301 on the surface of the valve stem 105 and the graphite packing 303 can effectively prevent the leakage of the medium between the valve stem 105 and the valve body 1, and further through the sealing gasket 304, as the second sealing line of defense, the sealing effect is further enhanced.

[0040] Working principle: When in use, when the valve is opened, the staff drives the ball valve 104 to rotate 90 degrees around its axis by operating the valve stem 105. At this time, the through hole in the center of the ball valve is aligned with the flow channels on both sides of the valve seat 103. Then, when the medium flows through the ball valve, at this time, due to the existence of fluid pressure, the contact pressure of the ball valve 104 and the graphite sealing ring 202 on both sides of the valve seat 103 is balanced, so that the valve can maintain good sealing performance during bidirectional flow, avoiding the elastic attenuation problem of the traditional titanium alloy ball valve caused by the long-term direct compression of the graphite sealing ring 202 by the spring 204. When closing the valve, turn the valve stem 105 again to rotate the ball valve 104 until it contacts and presses the sealing surface on the valve seat 103, and the medium pressure The characteristics of the graphite sealing ring 202 itself form a strong sealing effect, and further through the cooperation of the spring 204, the valve seat 103 and the ball valve 104 maintain preliminary contact when the valve is not in operation, which helps the valve seat 103 to quickly and accurately fit the spherical surface when the valve is opened and closed, providing the necessary compensation force, and further enhancing the sealing performance when the valve is closed. The sealing ring 205 arranged inside the left valve body 101 and the right valve body 102 can strengthen the connection seal between the valve bodies 1, prevent the medium from leaking from the joint of the valve bodies 1, and ensure the integrity of the entire valve structure. Therefore, when the pressure in the valve cavity increases abnormally, it can also play the function of automatic pressure relief, avoiding the valve from being damaged due to overpressure, thereby realizing two-way efficient sealing and automatic pressure relief protection.

[0041] When the device is not needed, the sealing cover 305 and the valve stem 105 are covered to prevent external impurities from entering. At the same time, when the valve stem 105 moves, the sealing cover 305 plays a certain guiding and supporting role, which can ensure that the graphite packing 303 and the packing gland 302 remain stable when the valve stem 105 moves, avoiding the problems of packing deflection and dislocation caused by the movement of the valve stem 105, thereby maintaining the sealing contact between the graphite packing 303 and the packing gland 302 and the valve stem 105, and ensuring the sealing effectiveness of the valve when opening and closing. The mutual cooperation of the retaining ring 301 on the surface of the valve stem 105 and the graphite packing 303 can effectively prevent the leakage of the medium between the valve stem 105 and the valve body 1, and further through the sealing gasket 304, as the second sealing line of defense, the sealing effect is further enhanced. Further, through the mutual cooperation of the packing gland 302 and the connecting block 306, pressure is applied to the graphite packing 303 below it, so that it is tightly wrapped around the valve stem 105 to form a good seal.

[0042] The above is only a preferred specific implementation of the utility model; however, the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and improved ideas of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model.

Claims

1. A bidirectional hard-sealed floating titanium alloy ball valve, comprising a valve body (1), a left valve body (101), a valve seat (103), a ball valve (104) and a right valve body (102), wherein the valve body (1) is composed of a left valve body (101) and a right valve body (102), and is characterized in that: The valve seat (103) and the ball valve (104) are arranged in a valve cavity formed by the combination of the left valve body (101) and the right valve body (102); a valve stem (105) is arranged inside the ball valve (104); a bidirectional hard seal floating assembly (2) is arranged inside the valve seat (103), the left valve body (101) and the right valve body (102); and a valve stem protection assembly (3) is arranged on the outer surface of the valve stem (105); The bidirectional hard seal floating assembly (2) comprises grooves (201) provided inside the valve seat (103), the left valve body (101) and the right valve body (102); graphite sealing rings (202) are provided inside the two grooves (201); and pressure seats (203) are movably connected to the outer surfaces of the two graphite sealing rings (202); The valve stem protection assembly (3) comprises a connection block (306) arranged on the outer surface of the valve stem (105), a packing gland (302) is clamped on the outer surface of the connection block (306), and a graphite packing (303) is arranged between the valve stem (105) and the valve stem (105).

2. A bidirectional hard-sealed floating titanium alloy ball valve according to claim 1, characterized in that: The outer surface of the valve stem (105) is movably connected to a sealing cover (305), and the outer surface of the sealing cover (305) is sleeved and connected to an anti-slip sleeve.

3. A bidirectional hard-sealed floating titanium alloy ball valve according to claim 1, characterized in that: A retaining ring (301) is provided on the outer surface of the valve stem (105), and the lower surface of the retaining ring (301) is movably connected to a packing gland (302).

4. A bidirectional hard-sealed floating titanium alloy ball valve according to claim 1, characterized in that: A plurality of springs (204) are fixedly connected to the outer surface of the pressure seat (203), and the other end of the spring (204) is connected to the inside of the groove (201).

5. A bidirectional hard-sealed floating titanium alloy ball valve according to claim 1, characterized in that: A sealing ring (205) is disposed inside the left valve body (101) and the right valve body (102), and the thickness of the sealing ring (205) is between two centimeters and five centimeters.

6. A bidirectional hard-sealed floating titanium alloy ball valve according to claim 1, characterized in that: A sealing gasket (304) is provided below the graphite filler (303) and on the outer surface of the valve stem (105), and the thickness of the sealing gasket (304) is one centimeter.

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