A castless flange safety valve

Abstract

The utility model relates to valve technical field especially relates to a flange safety valve without casting. Including valve body, valve clapper, spring and adjusting mechanism, the valve body is the import valve body made by section bar processing, and the import end of this import valve body is equipped with the bottom flange of integrated forming, the outlet side of import valve body is fixed with an independent outlet flange plate through the threaded connection mode. The utility model discloses a purpose to solve the existing flange safety valve must open mould casting to the valve body with flange, and there are the long engineering delivery time of open mould casting, the defect that casting is easy to appear impurity, no certain quantity time cost is high, and the strength of casting valve body is poor compared with section bar valve body etc.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a flange safety valve without castings. Background Technology

[0002] Safety valves are crucial safety devices in industrial piping systems. They are primarily used to automatically open when the system pressure exceeds a set value, releasing overpressured media and preventing safety accidents caused by excessive pressure. Traditional flange safety valves typically consist of components such as a valve body, valve disc, spring, and regulating mechanism. Among these, the valve body is the main pressure-bearing component of the safety valve and needs to possess sufficient strength and sealing performance.

[0003] However, existing flanged safety valves suffer from several significant technical problems during manufacturing: First, traditional flanged safety valves require mold casting of the flanged valve body, which involves long lead times and extends the product production cycle. Second, castings are prone to defects such as porosity, slag inclusions, and shrinkage cavities, affecting product quality and service life. Third, casting processes require a certain production volume to reduce costs; for small-batch or customized production, costs are high. Fourth, the strength of cast valve bodies is generally lower than that of valve bodies machined from profiles, posing safety hazards under high-pressure conditions. These problems severely restrict the production efficiency, quality stability, and application range of flanged safety valves. Utility Model Content

[0004] The purpose of this utility model is to solve the technical problems of existing flange safety valves, which require the valve body with flange to be cast by mold opening. These problems include long lead times for mold opening casting, easy inclusion of impurities in castings, high cost when there is no certain quantity, and lower strength of cast valve bodies compared to profile valve bodies.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] According to one aspect of the present invention, a flange safety valve without castings is provided, comprising a valve body, a valve disc, a spring and an adjusting mechanism, wherein the valve body is an inlet valve body made of profile, and the inlet end of the inlet valve body is provided with an integrally formed bottom flange; the outlet side of the inlet valve body is fixed with an independent outlet flange plate by means of a threaded connection.

[0007] Optionally, the profile may be an aluminum alloy profile or a stainless steel profile.

[0008] Optionally, the adjustment mechanism includes an adjusting nut and an adjusting screw, wherein the preload of the spring is changed by rotating the adjusting nut.

[0009] Optionally, the flange safety valve may further include a guide seat disposed within the valve body, wherein the valve disc is disposed vertically within the guide seat and its movement trajectory is guided by the guide seat.

[0010] Optionally, the guide seat also limits the opening height of the valve disc.

[0011] Optionally, a seal is provided at the connection between the inlet valve body and the outlet flange.

[0012] Optionally, the bottom flange and / or outlet flange plate are provided with bolt holes for connection.

[0013] Optionally, the spring is positioned between the valve disc and the adjusting mechanism to provide a closing force for the safety valve.

[0014] The advantages of this utility model are as follows: Compared with the prior art, the flangeless safety valve of this utility model uses profile processing to make the valve body, the bottom flange is integrally formed, and the side flange is fixed to the valve body by threads, eliminating the need for casting mold opening and greatly shortening the production cycle; the profile valve body has higher strength than the casting valve body, and is less prone to defects such as impurities and cracks, thus improving the reliability of the product; when there are many specifications and small quantities, the production cost is significantly reduced by avoiding the high cost of casting mold opening; the outlet flange plate is fixed by threaded connection, making the flange specification combination more flexible and able to meet the needs of different application scenarios. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a cross-sectional view of the flange safety valve described in this utility model.

[0017] In the diagram: 1. Valve body; 2. Valve disc; 3. Guide seat; 4. Adjusting screw; 5. Spring; 6. Outlet flange; 7. Bottom flange. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example 1

[0020] like Figure 1As shown, a flange safety valve without castings includes a valve body 1, a valve disc 2, a spring 5, and an adjusting mechanism. The valve body 1 is an inlet valve body 1 machined from profiles, and the inlet end of the inlet valve body 1 is provided with an integrally formed bottom flange 7. An independent outlet flange plate 6 is fixed to the outlet side of the inlet valve body 1 by a threaded connection.

[0021] The profiles can be made of aluminum alloy or stainless steel. Aluminum alloy profiles are lightweight and have good corrosion resistance, while stainless steel profiles have higher strength and high temperature resistance. Stainless steel profiles are more suitable for high-temperature and high-pressure working environments; while aluminum alloy profiles are a better choice for applications with high weight and cost requirements.

[0022] This castingless flange safety valve has an internal guide seat 3. The valve disc 2 is movably mounted within the guide seat 3, and its movement is guided by the guide seat 3. The guide seat 3 adopts a precision-machined cylindrical structure with a smooth inner wall, ensuring that the valve disc 2 moves smoothly along a predetermined trajectory during opening and closing, avoiding skewing or jamming, and improving the reliability and service life of the safety valve. The guide seat 3 also limits the opening height of the valve disc 2 to prevent it from over-opening under high pressure, which could cause damage or it flying out. The limiting mechanism is achieved by a stop block on the top of the guide seat 3. When the valve disc 2 rises to the predetermined height, it contacts the stop block and stops rising further.

[0023] Spring 5 is positioned between valve disc 2 and the adjusting mechanism to provide closing force for the safety valve. Spring 5 is made of a high-elasticity alloy material, ensuring stable elasticity during long-term use. When the system pressure exceeds the pressure provided by spring 5, valve disc 2 is pushed open, releasing the system pressure.

[0024] The adjusting mechanism includes an adjusting nut and an adjusting screw 4. Rotating the adjusting nut changes the preload of the spring 5. The adjusting nut engages with the threaded part on the upper part of the valve body 1. Rotating the adjusting nut changes the spring compression, thereby adjusting the opening pressure of the safety valve. Clockwise rotation of the adjusting nut increases the spring compression, raising the opening pressure of the safety valve; counterclockwise rotation decreases the spring compression, lowering the opening pressure of the safety valve.

[0025] A sealing element is provided at the connection between the inlet valve body 1 and the outlet flange 6. The sealing element is made of high-temperature and corrosion-resistant materials, such as polytetrafluoroethylene or metal gaskets, which can maintain good sealing performance under high temperature and high pressure environments. The sealing element is installed in the groove between the inlet valve body 1 and the outlet flange 6. When the outlet flange 6 is connected to the inlet valve body 1 by threads and tightened, the sealing element is compressed to form a reliable seal and prevent media leakage.

[0026] Both the bottom flange 7 and the outlet flange 6 have bolt holes for connection. These bolt holes are evenly distributed in a ring shape to facilitate the connection and fixation of the safety valve to the piping system. The bolt holes on the bottom flange 7 are used to install the safety valve onto the system's inlet pipe, and the bolt holes on the outlet flange 6 are used to connect to the discharge pipe. The number and size of the bolt holes are determined according to the operating pressure and diameter of the safety valve to ensure a firm and reliable connection.

[0027] During the operation of the safety valve, when the system pressure is lower than the set value, the spring pressure keeps the valve disc 2 tightly pressed against the valve seat, and the valve is in the closed state. When the system pressure exceeds the set value, the pressure overcomes the spring pressure, opening the valve disc 2, allowing the medium to flow from the inlet valve body 1 to the outlet flange 6 and be discharged through the connected discharge pipe, thereby reducing the system pressure. When the system pressure drops below the set value, the spring pressure closes the valve disc 2 again, restoring the sealing state.

[0028] This castingless flange safety valve uses profile machining to create the inlet valve body 1 and a threaded connection to fix the outlet flange plate 6. This avoids defects that may arise from traditional casting processes, such as porosity and slag inclusions, thus improving product quality and reliability. At the same time, this structural design facilitates maintenance and component replacement, extending the service life of the safety valve.

[0029] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A flange safety valve without castings, comprising a valve body, a valve disc, a spring, and an adjusting mechanism, characterized in that: The valve body is an inlet valve body made of profile, and the inlet end of the inlet valve body is provided with an integrally formed bottom flange; The outlet side of the inlet valve body is fixed with an independent outlet flange plate by a threaded connection.

2. The flange safety valve without castings according to claim 1, characterized in that: The profile is an aluminum alloy profile or a stainless steel profile.

3. The flange safety valve without castings according to claim 1, characterized in that: The adjustment mechanism includes an adjusting nut and an adjusting screw, and the preload of the spring is changed by rotating the adjusting nut.

4. A flange safety valve without castings according to claim 1, characterized in that: The flange safety valve also includes a guide seat disposed within the valve body, and the valve disc is disposed within the guide seat, which guides its movement trajectory.

5. A flange safety valve without castings according to claim 4, characterized in that: The guide seat also limits the opening height of the valve disc.

6. A flange safety valve without castings according to claim 1, characterized in that: A sealing element is provided at the connection between the inlet valve body and the outlet flange.

7. A flange safety valve without castings according to claim 1, characterized in that: The bottom flange and / or outlet flange plate are provided with bolt holes for connection.

8. A flange safety valve without castings according to claim 1, characterized in that: The spring is positioned between the valve disc and the adjusting mechanism to provide a closing force for the safety valve.

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