Valve capable of preventing frost crack

Abstract

The utility model discloses a frost crack prevention valve which comprises a valve body, the left end and the right end of the valve body are each provided with a flange plate, a valve element assembly is installed in the valve body, a boss is arranged on the outer curved surface of the valve body, a circulation hole communicated with the interior of the valve body is formed in the table top of the boss, and a pressure relief assembly is installed on the boss. The pressure relief assembly comprises a shell arranged outside the valve body, an abutting ring is arranged on the outer curved surface of the shell, when the interior of the valve body is frozen to enable a medium in the valve body to expand, the pressure relief assembly can conduct pressure relief work to a certain degree so as to prevent the valve body from being damaged, in addition, an indicating rod is further arranged in the pressure relief assembly, and the indicating rod is used for indicating the pressure of the valve body. A worker can conveniently know whether a medium in the valve body is frozen or not; the pressure relief assembly is obliquely arranged, so that the damage to the valve body caused by a water hammer phenomenon when the valve is closed or opened can be relieved.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a valve for preventing freezing and cracking. Background Technology

[0002] A valve is a device used to control the flow of fluid in pipes or equipment.

[0003] When the valve core is closed, if the ambient temperature is low enough to cause the medium in the pipeline to freeze, the medium will expand in volume. This expansion will exert enormous pressure on the internal cavity of the valve, the pipeline, and the connected parts, which may cause the valve body to deform, bulge, or even rupture, affecting the normal structure and sealing performance of the valve.

[0004] To address the above issues, existing valves need to be improved to prevent them from being damaged at low temperatures. Utility Model Content

[0005] In view of the shortcomings of the prior art, the present invention provides a valve to prevent freezing and cracking, thereby solving the problems mentioned in the background art.

[0006] This utility model provides the following technical solution: a valve for preventing freezing and cracking, including a valve body, a flange at each of the left and right ends of the valve body, a valve core assembly installed inside the valve body, a boss on the outer curved surface of the valve body, a flow hole communicating with the valve body inside the platform of the boss, and a pressure relief assembly installed on the boss.

[0007] The pressure relief assembly includes a housing disposed outside the valve body. The outer curved surface of the housing is provided with an abutment ring. The housing is threadedly connected to the flow hole, such that the abutment ring is attached to the platform of the boss. A sealing ring is provided between the abutment ring and the boss. A piston is slidably connected inside the housing. A spring is provided between the piston and the top wall inside the housing. An abutment platform is also provided on the inner wall of the housing, and the abutment platform is attached to the lower side of the piston.

[0008] Preferably, the upper side of the outer casing is provided with a through hole, and the upper side of the piston is provided with an indicator rod that passes through the through hole.

[0009] Preferably, the platform of the boss and the housing are angled so that the axis of the housing intersects the valve core assembly.

[0010] Preferably, the flow hole has a rounded corner between the side near the valve core assembly and the upper curved surface of the flow channel inside the valve body.

[0011] Preferably, there are two bosses and pressure relief components, located on the left and right sides of the valve core assembly, respectively.

[0012] Preferably, the outer shell includes a hollow barrel and a lid, the lid being threadedly connected to the upper end of the hollow barrel.

[0013] Preferably, the hollow barrel is provided with a threaded hole, and a plug is installed in the threaded hole. The plug is located on the upper side of the abutment platform, and the distance between the plug and the abutment platform is not less than the width of the piston.

[0014] Preferably, a rubber pad is provided on the upper side of the abutment platform.

[0015] This utility model provides a valve to prevent freezing and cracking, which has the following beneficial effects:

[0016] This utility model has a pressure relief component on the valve body. When the medium inside the valve body freezes and expands, the pressure relief component can perform a certain degree of pressure relief to avoid damage to the valve body. In addition, an indicator rod is also provided in the pressure relief component so that the operator can know whether the medium inside the valve body is frozen.

[0017] The pressure relief component in this invention is angled to mitigate the damage to the valve body caused by water hammer when the valve is closed or opened. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the appearance of this utility model;

[0019] Figure 2 This is the front view of this utility model;

[0020] Figure 3 yes Figure 2 Enlarged diagram of point A in the middle.

[0021] In the picture:

[0022] 11. Valve body; 12. Flange; 13. Boss; 21. Housing; 22. Abutment ring; 23. Piston; 24. Spring; 25. Abutment platform; 26. Indicator rod; 31. Hollow barrel; 32. Cover; 33. Plug. Detailed Implementation

[0023] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Reference Figures 1-3 According to an embodiment of the present invention, a valve for preventing freezing and cracking includes a valve body 11, with a flange 12 at each of the left and right ends of the valve body 11, and a flow channel is provided inside the valve body 11. The valve body 11 is also equipped with a valve core assembly, which is prior art and can be either a ball valve or a gate valve, and will not be described in detail here.

[0028] A boss 13 is provided on the outer curved surface of the valve body 11. A flow hole communicating with the valve body 11 is provided in the platform of the boss 13. A pressure relief assembly is installed on the boss 13. The pressure relief assembly includes a housing 21 located outside the valve body 11. An abutment ring 22 is provided on the outer curved surface of the housing 21. The housing 21 is threaded into the flow hole, and the abutment ring 22 is attached to the platform of the boss 13. A sealing ring (not shown in the figure) is provided between the abutment ring 22 and the boss 13 to maintain a sealing relationship between the housing 21 and the boss 13 to prevent water leakage. Furthermore, a piston 23 is slidably connected inside the housing 21. A spring 24 is provided between the piston 23 and the top wall inside the housing 21. An abutment platform 25 is also provided on the inner wall of the housing 21. The abutment platform 25 is attached to the lower side of the piston 23 to prevent the piston 23 from moving into the flow hole.

[0029] When the valve core assembly is closed and the medium in the flow channel freezes to increase its volume, it will push the piston 23 upward, thereby preventing the valve body 11 from being under excessive pressure and causing the valve body 11 to rupture.

[0030] In addition, to facilitate the observation of the location of the piston 23 by the staff and to avoid obstruction of the up-and-down movement of the piston 23 under air pressure, a through hole is provided on the upper side of the outer shell 21, and an indicator rod 26 is provided on the upper side of the piston 23 through the through hole. The staff can observe the extension length of the indicator rod 26 to know the location of the piston 23 and whether the medium in the valve body 11 has frozen.

[0031] In a second embodiment of the valve designed to prevent freezing and cracking, in order to mitigate the damage to the valve body 11 caused by water hammer, the platform of the boss 13 and the outer shell 21 are angled so that the axis of the outer shell 21 intersects the valve core assembly. The flow hole has a rounded corner between the side near the valve core assembly and the upper curved surface of the inner flow channel of the valve body 11. With this configuration, the piston 23 can provide a greater buffering effect when water hammer occurs. The upper side of the abutment platform 25 is provided with a rubber pad, which, together with the friction between the piston 23 and the inner wall of the outer shell 21, can reduce the rebound of the piston 23 and reduce noise.

[0032] To facilitate the replacement of the spring 24 and enable the housing 21 to be used in valves with different working pressures, the housing 21 includes a hollow barrel 31 and a cover 32. The cover 32 is threaded to the upper end of the hollow barrel 31. A second sealing ring (not shown in the figure) is provided between the hollow barrel 31 and the cover 32 to ensure a sealing effect.

[0033] In addition, the hollow barrel 31 is provided with a threaded hole, and a plug 33 is provided in the threaded hole. The plug 33 is located on the upper side of the abutment platform 25, and the distance between the plug 33 and the abutment platform 25 is not less than the width of the piston 23. Before the cover 32 needs to be unscrewed to replace the spring 24, the operator first removes the plug 33, then inserts the rod into the threaded hole, so that the piston 23 is clamped between the abutment platform 25 and the rod, to ensure that the piston 23 will not be pushed out due to pressure after the cover 32 is unscrewed, which facilitates the replacement of the spring 24.

[0034] In a third embodiment of the valve designed to prevent freezing and cracking, two bosses 13 and two pressure relief components are provided, located on the left and right sides of the valve core assembly, respectively, so that the valve body 11 is suitable for use in dual-phase control scenarios.

[0035] The above description is only a specific embodiment of the present utility model, but the technical features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A valve for preventing freezing and cracking, comprising a valve body (11), wherein a flange (12) is provided at each of the left and right ends of the valve body (11), and a valve core assembly is installed inside the valve body (11), characterized in that: A boss (13) is provided on the outer curved surface of the valve body (11). A flow hole communicating with the valve body (11) is provided in the platform of the boss (13). A pressure relief component is installed on the boss (13). The pressure relief assembly includes a housing (21) disposed outside the valve body (11). The outer curved surface of the housing (21) is provided with an abutment ring (22). The housing (21) is threaded into the flow hole, and the abutment ring (22) is attached to the platform of the boss (13). A sealing ring is provided between the abutment ring (22) and the boss (13). A piston (23) is slidably connected inside the housing (21). A spring (24) is provided between the piston (23) and the top wall inside the housing (21). An abutment platform (25) is also provided on the inner wall of the housing (21). The abutment platform (25) is attached to the lower side of the piston (23).

2. The valve for preventing freezing and cracking according to claim 1, characterized in that: The upper side of the outer casing (21) is provided with a through hole, and the upper side of the piston (23) is provided with an indicator rod (26) that passes through the through hole.

3. The valve for preventing freezing and cracking according to claim 1, characterized in that: The platform of the boss (13) and the housing (21) are arranged obliquely so that the axis of the housing (21) can intersect the valve core assembly.

4. The valve for preventing freezing and cracking according to claim 3, characterized in that: The flow hole has a rounded corner between the side near the valve core assembly and the upper curved surface of the flow channel inside the valve body (11).

5. The valve for preventing freezing and cracking according to claim 1, characterized in that: There are two bosses (13) and pressure relief components, which are located on the left and right sides of the valve core assembly, respectively.

6. The valve for preventing freezing and cracking according to claim 1, characterized in that: The outer shell (21) includes a hollow barrel (31) and a cover (32), the cover (32) being threaded to the upper end of the hollow barrel (31).

7. A valve for preventing freezing and cracking according to claim 6, characterized in that: The hollow barrel (31) is provided with a threaded hole, and a plug (33) is installed in the threaded hole. The plug (33) is located on the upper side of the abutment platform (25), and the distance between the plug (33) and the abutment platform (25) is not less than the width of the piston (23).

8. The valve for preventing freezing and cracking according to claim 1, characterized in that: A rubber pad is provided on the upper side of the abutment platform (25).

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