A two-piece straight-through stop valve

Abstract

This utility model discloses a two-piece straight-through stop valve, relating to the field of stop valve technology. It includes a main valve body, a secondary valve body, a valve stem, a valve cover, and a valve disc. The main valve body and the secondary valve body are locked together by threaded fittings to form the valve body. The valve cover is sealed to the top of the valve body. The bottom of the valve stem penetrates the valve cover and extends into the inner cavity of the valve body. The bottom of the valve stem is coaxially inserted into the valve disc. A cap is used to seal the valve stem and valve disc together. The valve body's structure, consisting of a main valve body and a secondary valve body locked together by threaded fittings, simplifies the fabrication of the fluid flow channels for both the main and secondary valve bodies, thus solving the problem of manufacturing the flow channel for a straight-through stop valve.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, and in particular to a two-piece straight-through gate valve. Background Technology

[0002] A gate valve controls the flow of fluid by rotating a handwheel or drive mechanism, which moves the valve stem up and down, altering the gap between the valve disc and the valve body. When the conical sealing surfaces of the valve disc and valve body are tightly fitted, the gate valve is closed, preventing fluid from passing through. As the valve disc moves upward, the gap between the valve disc and valve body gradually increases, allowing fluid to pass through the gate valve.

[0003] A so-called straight-through shut-off valve is characterized by a valve body structure in which fluid enters from one end of the valve body, passes through the gap between the valve disc and the valve seat, and then flows out from the other end of the valve body. The inlet and outlet of the flow channel are on the same straight line, and the flow channel inside the valve body is S-shaped.

[0004] Currently, most straight-through gate valves on the market are single-piece designs, meaning the valve body is a single, independent unit. Because the fluid flow path within the valve body is S-shaped, this S-shaped flow path can only be manufactured using casting processes. However, when the straight-through gate valve operates under high temperature and high pressure conditions, the valve body must be made of metal forgings, as this S-shaped flow path cannot be manufactured using machining. Therefore, a new type of straight-through gate valve needs to be designed. Utility Model Content

[0005] The purpose of this utility model is to provide a two-piece straight-through shut-off valve to solve the problems existing in the prior art. The valve body adopts a structure in which the main valve body and the auxiliary valve body are locked together by threaded parts. It becomes simple and feasible to process the fluid flow channels of the main valve body and the auxiliary valve body separately, thereby solving the problem of manufacturing the flow channel of the straight-through shut-off valve.

[0006] To achieve the above objectives, this utility model provides the following solution: This utility model provides a two-piece straight-through shut-off valve, including a main valve body, a secondary valve body, a valve stem, a valve cover, and a valve disc. The main valve body and the secondary valve body are locked together to form a valve body by threaded fittings. The valve cover is sealed and installed on the top of the valve body. The bottom of the valve stem passes through the valve cover and extends into the inner cavity of the valve body. The bottom of the valve stem is coaxially inserted into the valve disc. The valve disc is capped to seal the valve stem and valve disc together.

[0007] In one embodiment, an inlet cylindrical hole is machined on the left side of the main valve body, and upper and lower cylindrical holes of different sizes are machined on the main body of the main valve body from top to bottom, and an outlet cylindrical hole is machined on the upper right side of the main valve body.

[0008] In one embodiment, the diameters of the inlet cylindrical hole, the lower cylindrical hole, and the outlet cylindrical hole are similar or equal, and the diameter of the upper cylindrical hole is greater than the diameters of the inlet cylindrical hole, the lower cylindrical hole, and the outlet cylindrical hole.

[0009] In one embodiment, the upper flange of the main valve body is provided with a sealing ring groove, a sealing ring is placed in the sealing ring groove, and the valve cover is fastened to the main valve body with a threaded fitting.

[0010] In one embodiment, a straight slot is machined on the left side of the secondary valve body, and a cylindrical hole is machined on the lower right side of the secondary valve body. The cross-sectional area of ​​the straight slot is similar to or equal to that of the cylindrical hole. The straight slot is connected to the outlet cylindrical hole of the main valve body, and the straight slot is connected to the cylindrical hole.

[0011] In one embodiment, the left end face of the secondary valve body is provided with a sealing ring groove and a threaded hole that is fixedly connected to the main valve body, and a sealing ring is placed in the sealing ring groove.

[0012] In one embodiment, the valve stem is stepped, and the diameter of the lower cylinder of the valve stem is larger than the diameter of the upper cylinder.

[0013] In one embodiment, the lower end of the valve disc cap abuts against the stepped surface at the lower end of the valve stem.

[0014] In one embodiment, a sealing packing is placed in the cylindrical hole in the middle of the valve cover, and the sealing packing is pressed tightly by a packing gland.

[0015] In one embodiment, the upper cylindrical hole of the valve cover is threaded, and a valve stem nut is screwed into the upper cylindrical hole of the valve cover. The valve stem nut is fixed with a set screw and cannot be rotated. The inner hole of the valve stem nut is threaded with a trapezoidal internal thread, which meshes with the trapezoidal external thread of the valve stem. A handwheel is installed on the top outer periphery of the valve stem, and the handwheel is used to drive the valve stem to rotate.

[0016] The present invention achieves the following beneficial technical effects compared to the prior art:

[0017] The two-piece straight-through shut-off valve of this utility model includes a main valve body, a secondary valve body, a valve stem, a valve cover, and a valve disc. The main valve body and the secondary valve body are locked together by threaded fittings to form the valve body. The valve cover is sealed and installed on the top of the valve body. The bottom of the valve stem passes through the valve cover and extends into the inner cavity of the valve body. The bottom of the valve stem is coaxially inserted into the valve disc. The valve disc is capped to seal the valve stem and valve disc together. The valve body adopts a structure in which the main valve body and the secondary valve body are locked together by threaded fittings, making it simple and feasible to process the fluid flow channels of the main valve body and the secondary valve body separately, thus solving the problem of manufacturing the flow channel of the straight-through shut-off valve. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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.

[0019] Figure 1 This is a schematic diagram of the overall structure of a two-piece straight-through shut-off valve.

[0020] Figure 2 A 3D view of the main valve body;

[0021] Figure 3 A sectional view of the main valve body;

[0022] Figure 4 A 3D view of the secondary valve body;

[0023] Figure 5 This is a sectional view of the secondary valve body;

[0024] Figure 6 This is a left view of the secondary valve body;

[0025] The components are as follows: 1. Main valve body; 2. Secondary valve body; 3. Valve disc; 4. Valve disc cap; 5. Valve stem; 6. Valve cover; 7. Sealing packing; 8. Packing gland; 9. Valve stem nut; 10. Handwheel; 11. Set screw; 12. Sealing ring; 13. Sealing ring; 14. Threaded parts; 15. Threaded hole; 16. Straight groove hole; 17. Sealing ring groove. Detailed Implementation

[0026] 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.

[0027] The purpose of this utility model is to provide a two-piece straight-through shut-off valve to solve the problems existing in the prior art. The valve body adopts a structure in which the main valve body and the auxiliary valve body are locked together by threaded parts. It becomes simple and feasible to process the fluid flow channels of the main valve body and the auxiliary valve body separately, thereby solving the problem of manufacturing the flow channel of the straight-through shut-off valve.

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figures 1-6As shown, this utility model provides a two-piece straight-through shut-off valve, including a main valve body 1, a secondary valve body 2, a valve stem 5, a valve cover 6, and a valve disc 3. The main valve body 1 and the secondary valve body 2 are locked together to form a valve body by a threaded component 14. The valve cover 6 is sealed and installed on the top of the valve body. The bottom of the valve stem 5 passes through the valve cover 6 and extends into the inner cavity of the valve body. The bottom of the valve stem 5 is coaxially inserted into the valve disc 3. The valve disc cap 4 is used to seal and connect the valve stem 5 and the valve disc 3.

[0030] The valve body adopts a structure in which the main valve body 1 and the auxiliary valve body 2 are locked together by the threaded part 14. It becomes simple and feasible to process the fluid flow channels of the main valve body 1 and the auxiliary valve body 2 respectively, thus solving the problem of manufacturing the flow channel of the straight-through shut-off valve.

[0031] Specifically, both the main valve body 1 and the auxiliary valve body 2 are metal forgings with good mechanical properties, reasonable fiber structure, and high strength, high toughness, and high temperature resistance.

[0032] like Figures 2-3 As shown, the left side of the main valve body 1 has a cylindrical inlet hole for the fluid. From top to bottom, two cylindrical holes of different sizes are machined, with the upper cylindrical hole being the larger one. The upper right side has an outlet cylindrical hole. The machining of these four cylindrical holes is the most common machining process for metal parts, with the diameter of the upper cylindrical hole being larger than the diameter of the other three cylindrical holes.

[0033] The fluid flows in from the horizontally positioned inlet cylindrical hole on the left, then flows vertically upward through the lower cylindrical hole to the upper vertical cylindrical hole, and then flows from the outlet cylindrical hole on the right to the flow channel corresponding to the auxiliary valve body 2 on the right.

[0034] The main valve body 1 has an inlet cylindrical hole horizontally arranged on the left side, a lower cylindrical hole vertically arranged on the right side, and an outlet cylindrical hole horizontally arranged on the right side. The diameters of these three cylindrical holes are approximately equal to facilitate smooth flow and reduce flow resistance.

[0035] The main valve body 1 has a flange with a sealing ring groove 17, and a sealing ring 12 is placed in the sealing ring groove 17. The valve cover 6 is fastened to the main valve body 1 with a threaded part 14 to compress the sealing ring 12 and prevent fluid from leaking from the valve cavity.

[0036] like Figures 4-6 As shown, a straight slot hole 16 is machined on the left side of the secondary valve body 2, and a cylindrical hole is machined on the lower right side. The cross-sectional area of ​​the straight slot hole 16 is approximately equal to the cross-sectional area of ​​the cylindrical hole on the right side of the secondary valve body 2. The machining of the straight slot hole 16 and the cylindrical hole on the right side is the most common machining process for metal parts.

[0037] The straight slot 16 communicates with the cylindrical hole on the right side of the auxiliary valve body 2. Fluid flows through this straight slot 16 and exits from the cylindrical hole on the right side. A sealing ring groove 17 is provided on the left end face of the auxiliary valve body 2, and a threaded hole 15 is provided to be fixed to the main valve body 1. The sealing ring groove 17 holds the sealing ring 12. When the main valve body 1 and the auxiliary valve body 2 are tightened with the threaded part 14, the sealing ring 12 prevents fluid from leaking from the valve cavity. In order to ensure the sealing effect of the main valve body 1 and the auxiliary valve body 2, a sealing ring 13 is also provided in the sealing surface of the main valve body 1 and the auxiliary valve body 2.

[0038] like Figure 1 As shown, the valve stem 5 is stepped, with the diameter of the lower cylindrical part being larger than the diameter of the upper part. The valve stem 5 is coaxially inserted into the valve disc 3, and the valve disc cap 4 is tightened. The lower end of the valve disc cap 4 abuts against the lower stepped surface of the valve stem 5, preventing the valve stem 5 from separating from the valve disc 3. The valve disc 3 and the valve stem 5 move synchronously in the vertical direction.

[0039] A sealing packing 7 is placed in the cylindrical hole in the middle of the valve cover 6. The sealing packing 7 is pressed tightly by the packing gland 8 to prevent fluid from leaking from the valve cavity.

[0040] The upper cylindrical hole of the valve cover 6 is threaded, and the valve stem nut 9 is screwed in. The valve stem nut 9 is fixed in place by the set screw 11 and cannot rotate. The inner hole of the valve stem nut 9 is machined with a trapezoidal internal thread, which meshes with the trapezoidal external thread of the valve stem 5. The trapezoidal thread has a self-locking characteristic and low rotational friction torque. When the handwheel 10 drives the valve stem 5 to rotate, the valve stem 5 and the valve disc 3 move in a vertical direction.

[0041] When valve disc 3 moves downward and the conical sealing surface between valve disc 3 and valve body is tightly fitted, the shut-off valve is in the closed state, preventing fluid from passing through; when valve disc 3 moves upward, the gap between valve disc 3 and valve body gradually increases, and fluid can flow through the shut-off valve.

[0042] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0043] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A two-piece straight-through shut-off valve, characterized in that: The valve includes a main valve body, a secondary valve body, a valve stem, a valve cover, and a valve disc. The main valve body and the secondary valve body are locked together to form a valve body by threaded fittings. The valve cover is sealed and installed on the top of the valve body. The bottom of the valve stem passes through the valve cover and extends into the inner cavity of the valve body. The bottom of the valve stem is coaxially inserted into the valve disc. The valve disc is capped to seal the valve stem and the valve disc together.

2. The two-piece straight-through shut-off valve according to claim 1, characterized in that: The main valve body has an inlet cylindrical hole machined on the left side. The main valve body has upper and lower cylindrical holes of different sizes machined from top to bottom. The main valve body has an outlet cylindrical hole machined on the upper right side.

3. The two-piece straight-through shut-off valve according to claim 2, characterized in that: The diameters of the inlet cylindrical hole, the lower cylindrical hole, and the outlet cylindrical hole are similar or equal, while the diameter of the upper cylindrical hole is greater than the diameters of the inlet cylindrical hole, the lower cylindrical hole, and the outlet cylindrical hole.

4. The two-piece straight-through shut-off valve according to claim 1, characterized in that: The upper flange of the main valve body is provided with a sealing ring groove, and a sealing ring is placed in the sealing ring groove. The valve cover is fastened to the main valve body with threaded parts.

5. The two-piece straight-through shut-off valve according to claim 1, characterized in that: A straight groove is machined on the left side of the secondary valve body, and a cylindrical hole is machined on the lower right side of the secondary valve body. The cross-sectional area of ​​the straight groove is similar to or equal to that of the cylindrical hole. The straight groove is connected to the outlet cylindrical hole of the main valve body, and the straight groove is connected to the cylindrical hole.

6. The two-piece straight-through shut-off valve according to claim 1, characterized in that: The left end face of the secondary valve body is provided with a sealing ring groove and a threaded hole that is fixed to the main valve body, and a sealing ring is placed in the sealing ring groove.

7. The two-piece straight-through shut-off valve according to claim 1, characterized in that: The valve stem is stepped, and the diameter of the lower cylinder of the valve stem is larger than the diameter of the upper cylinder.

8. The two-piece straight-through shut-off valve according to claim 7, characterized in that: The lower end of the valve disc and cap abuts against the stepped surface at the lower end of the valve stem.

9. The two-piece straight-through shut-off valve according to claim 1, characterized in that: A sealing packing is placed in the cylindrical hole in the middle of the valve cover, and the sealing packing is pressed tightly by a packing gland.

10. The two-piece straight-through shut-off valve according to claim 1, characterized in that: The upper cylindrical hole of the valve cover is threaded, and a valve stem nut is screwed into the upper cylindrical hole of the valve cover. The valve stem nut is fixed with a set screw and cannot be rotated. The inner hole of the valve stem nut is machined with a trapezoidal internal thread, which meshes with the trapezoidal external thread of the valve stem. A handwheel is installed on the top outer periphery of the valve stem, and the handwheel is used to drive the valve stem to rotate.

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