Steam stop valve

Abstract

The utility model provides a steam stop valve, and belongs to the technical field of stop valves. The problem that in the prior art, a sealing face is prone to abrasion and deformation, and consequently the leakage risk is high is solved. The stop valve comprises a stop valve body, a stop valve rod and a stop valve element, a sealing end cover is fixedly installed at the upper end of the stop valve body, a valve cavity is formed in the stop valve body, an installation base is formed in the valve cavity, a through hole is formed in the installation base, and the stop valve rod penetrates through the sealing end cover and extends into the valve cavity in the stop valve body. The stop valve element is connected with the lower end of the stop valve rod, a connecting convex body is formed at the upper end of the stop valve element, a limiting open groove is formed in the connecting convex body, a connecting groove is formed in the end of the stop valve rod, the connecting groove is fixedly connected with the limiting open groove, the stop valve element is of an integrally-formed structure, and the upper end face of the stop valve element is a thickened sealing arc ring. A flow guide cambered surface is formed on the lower end edge of the stop valve element. The utility model has the advantages of good sealing performance, stable connection of the valve core and the valve rod, diversion and self-cleaning functions.

Description

Technical Field

[0001] This utility model belongs to the field of gate valve technology and relates to a steam gate valve. Background Technology

[0002] Steam shut-off valves open and close by moving the valve disc linearly along the centerline of the fluid. They use the pressure of the valve stem to seal the valve disc against the valve seat, cutting off or regulating steam flow. They are widely used in steam systems in industries such as petroleum, chemical, and power, and have functions of shut-off, connection, and flow regulation.

[0003] Chinese patent publication number CN217003098U discloses a shut-off valve for steam pipelines, including a valve body, a cover, a rod, a valve core, and a bellows. The cover is disposed on the valve body, and the two cooperate to form a valve cavity. The inner wall of the valve cavity is provided with an arc-shaped surface. The valve body is provided with a first flow channel and a second flow channel, both of which are connected to the valve cavity. Both have a communication port formed on the arc-shaped surface. The valve core is movably disposed in the valve cavity, and the bottom is provided with a mating surface that can seal with the arc-shaped surface. The rod is threadedly connected to the cover, and the first end extends into the valve cavity and is rotatably connected to the valve core.

[0004] The patent provides a shut-off valve for steam pipelines, in which the dual-flow-channel seal is achieved only through the mating surface at the bottom of the valve core and the arc-shaped surface of the valve cavity. Relying solely on mechanical contact, the sealing surface is prone to wear and deformation under high-pressure steam or high-frequency opening and closing, resulting in a high risk of leakage. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a steam shut-off valve.

[0006] The objective of this utility model can be achieved through the following technical solution: A steam shut-off valve includes a shut-off valve body, a shut-off valve stem, and a shut-off valve core. The shut-off valve body is generally spherical, and flanged pipe interfaces extend from both ends of the shut-off valve body. A sealing end cap is fixedly installed on the upper end of the shut-off valve body. A valve cavity is formed inside the shut-off valve body, and a mounting seat is formed in the valve cavity. A through hole is opened in the mounting seat. The shut-off valve stem passes through the sealing end cap and extends into the valve cavity inside the shut-off valve body. The shut-off valve core is connected to the lower end of the shut-off valve stem. A connecting protrusion is formed on the upper end of the shut-off valve core. A limiting groove is opened in the connecting protrusion. A connecting groove is opened at the end of the shut-off valve stem. The end of the shut-off valve stem extends into the limiting groove, and the connecting groove is fixedly connected to the limiting groove. The shut-off valve core is an integrally formed structure, and the upper end face of the shut-off valve core is a thickened sealing arc ring. A flow guiding arc surface is formed on the lower edge of the shut-off valve core.

[0007] In the aforementioned steam shut-off valve, a packing gland is fixedly installed in the sealing end cover. The packing gland is sleeved on the outside of the shut-off valve stem and connected to the shut-off valve stem.

[0008] In the aforementioned steam shut-off valve, a valve stem nut is externally connected to the shut-off valve stem above the sealing end cover, and connecting rods are connected to both sides of the valve stem nut. The connecting rods are fixedly connected to the upper end face of the sealing end cover, and a handwheel is connected to the top of the shut-off valve stem.

[0009] In the aforementioned steam shut-off valve, the shut-off valve core is covered with a wear-resistant bushing. A sealing bevel is formed on the inner side of the wear-resistant bushing near its upper end. A sealing convex ring is formed at the upper end of the wear-resistant bushing. The lower end face of the thickened sealing arc ring is in contact with the upper end face of the sealing convex ring.

[0010] In the steam shut-off valve described above, the upper end of the thickened sealing arc ring on the front side of the connecting protrusion is provided with a flattened structure.

[0011] Compared with the prior art, the steam shut-off valve provided by this utility model has the following beneficial effects: 1. The connecting protrusion of the valve core and the connecting groove of the valve stem are nested through limiting slots to form axial and radial double constraints. This structure can resist the pulsating impact and high-frequency vibration of high-pressure steam, prevent the valve core from loosening or shifting, and ensure long-term operational stability; 2. The thickened sealing arc ring of the valve core and the sealing protrusion of the wear-resistant bushing are precisely fitted, increasing the contact area and improving the sealing performance, making the pressure evenly distributed, and resistant to the scouring of high-pressure steam. The sealing slope of the wear-resistant bushing forms a secondary sealing line when closed; 3. The guide arc surface at the lower end of the valve core makes the steam flow smoother, reduces turbulence and pressure drop, and prevents impurities from depositing near the valve seat, making it suitable for steam containing a small amount of particles. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the exploded structure of this utility model;

[0013] Figure 2 This is a schematic cross-sectional view of the present invention;

[0014] Figure 3 This is a schematic diagram of the valve core structure of a stop valve.

[0015] In the diagram: 1. Gate valve body; 11. Pipe interface; 12. Valve cavity; 13. Mounting seat; 14. Through hole; 2. Gate valve stem; 21. Connecting groove; 3. Gate valve core; 31. Connecting protrusion; 32. Limiting groove; 33. Thickened sealing arc ring; 34. Flow guiding arc surface; 35. Flattened structure; 4. Sealing end cap; 5. Packing gland; 6. Valve stem nut; 61. Connecting rod; 7. Handwheel; 8. Wear-resistant bushing; 81. Sealing bevel; 82. Sealing protrusion ring. Detailed Implementation

[0016] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0017] like Figures 1 to 3 As shown, this embodiment includes a stop valve body 1, a stop valve stem 2, and a stop valve core 3. The stop valve body 1 is generally spherical, with flanged pipe interfaces 11 extending from both ends for connection to external steam pipes. A sealing end cap 4 is fixedly installed on the upper end of the stop valve body 1 by bolts or welding. A valve cavity 12 is formed inside, and a mounting seat 13 is integrally formed in the valve cavity 12. A through hole 14 is opened in the center of the mounting seat 13 as a passage for steam flow. The stop valve stem 2 passes through the sealing end cap 4 and extends into the valve cavity 12 inside the stop valve body 1. The lower end is connected to the shut-off valve core 3. The upper end of the shut-off valve core 3 has a connecting protrusion 31. A limiting slot 32 is opened in the connecting protrusion 31. A connecting slot 21 is opened at the end of the shut-off valve stem 2. The end of the shut-off valve stem 2 extends into the limiting slot 32. The connecting slot 21 and the limiting slot 32 are fixedly connected to ensure a stable connection between the shut-off valve stem 2 and the shut-off valve core 3, preventing loosening under frequent operation or vibration environment. Moreover, the fit tolerance between the limiting slot 32 and the connecting slot 21 is very small, so that the shut-off valve core 3 is strictly coaxial with the through hole 14 of the mounting base 13 when it rises and falls.

[0018] like Figures 1 to 3 As shown, the shut-off valve core 3 is an integrally molded structure. The upper end face of the shut-off valve core 3 is a thickened sealing arc ring 33. The thickened design enhances the strength and wear resistance of the sealing surface, and can withstand the scouring of high temperature and high pressure steam. The lower edge of the shut-off valve core 3 forms a flow guiding arc surface 34. This flow guiding arc surface 34 plays a guiding role when steam flows, reducing fluid resistance and turbulence. The shut-off valve core 3 is covered with a wear-resistant bushing 8. The wear-resistant bushing 8 is made of wear-resistant materials such as hard alloy or stainless steel. It is fixed to the outside of the shut-off valve core 3 by an interference fit connection. The inner side of the wear-resistant bushing 8 near the upper end forms a sealing slope 81. The upper end of the wear-resistant bushing 8 forms a sealing convex ring 82. When the shut-off valve is closed, the lower end face of the thickened sealing arc ring 33 fits against the upper end face of the sealing convex ring 82. At the same time, the sealing slope 81 cooperates with the corresponding sealing surface in the shut-off valve body 1 to form a double sealing structure, which effectively improves the sealing performance.

[0019] To elaborate further, such as Figures 1 to 2As shown, a packing gland 5 is fixedly installed in the sealing end cover 4 by means of threads or snaps. The packing gland 5 is sleeved on the outside of the stop valve stem 2 and connected to the stop valve stem 2. The packing gland 5 is filled with sealing packing. The sealing between the stop valve stem 2 and the sealing end cover 4 is achieved by compressing the packing to prevent steam leakage. A valve stem nut 6 is connected to the outside of the stop valve stem 2 above the sealing end cover 4. Connecting rods 61 are connected to both sides of the valve stem nut 6 by welding or bolts. The other end of the connecting rod 61 is fixedly connected to the upper end face of the sealing end cover 4 to form a stable support structure. A handwheel 7 is connected to the top of the stop valve stem 2 by a key or thread. The operator drives the valve stem nut 6 to rotate by rotating the handwheel 7, thereby making the stop valve stem 2 move linearly up and down, realizing the opening and closing operation of the stop valve core 3.

[0020] To elaborate further, such as Figures 1 to 3 As shown, the upper end of the thickened sealing arc ring 33 on the front side of the connecting protrusion 31 is provided with a flattening structure 35. The flattening structure 35 makes the upper end of the shut-off valve core 3 a flat surface, making the connection between the shut-off valve stem 2 and the shut-off valve core 3 more stable.

[0021] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0022] Although this document uses a variety of terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A steam shut-off valve, comprising a shut-off valve body (1), a shut-off valve stem (2), and a shut-off valve core (3), wherein the shut-off valve body (1) is generally spherical and flanged pipe interfaces (11) extend from both ends of the shut-off valve body (1), characterized in that: A sealing end cap (4) is fixedly installed on the upper end of the shut-off valve body (1). A valve cavity (12) is formed inside the shut-off valve body (1), and a mounting seat (13) is formed in the valve cavity (12). A through hole (14) is opened in the mounting seat (13). The shut-off valve stem (2) passes through the sealing end cap (4) and extends into the valve cavity (12) inside the shut-off valve body (1). The shut-off valve core (3) is connected to the lower end of the shut-off valve stem (2). A sealing end cap (4) is formed on the upper end of the shut-off valve core (3). A connecting protrusion (31) is provided, a limiting slot (32) is provided in the connecting protrusion (31), a connecting groove (21) is provided at the end of the stop valve stem (2), the end of the stop valve stem (2) extends into the limiting slot (32) and the connecting groove (21) is fixedly connected to the limiting slot (32), the stop valve core (3) is an integrally formed structure and the upper end surface of the stop valve core (3) is a thickened sealing arc ring (33), and the lower edge of the stop valve core (3) forms a flow guiding arc surface (34).

2. A steam shut-off valve according to claim 1, characterized in that: A packing gland (5) is fixedly installed in the sealing end cap (4). The packing gland (5) is sleeved on the outside of the stop valve stem (2) and connected to the stop valve stem (2).

3. A steam shut-off valve according to claim 1, characterized in that: A valve stem nut (6) is externally connected to the shut-off valve stem (2) above the sealing end cap (4). Connecting rods (61) are connected to both sides of the valve stem nut (6). The connecting rods (61) are fixedly connected to the upper end face of the sealing end cap (4). A handwheel (7) is connected to the top of the shut-off valve stem (2).

4. A steam shut-off valve according to claim 1, characterized in that: The shut-off valve core (3) is covered with a wear-resistant bushing (8). A sealing slope (81) is formed on the inner side of the wear-resistant bushing (8) near the upper end. A sealing convex ring (82) is formed at the upper end of the wear-resistant bushing (8). The lower end face of the thickened sealing arc ring (33) is in contact with the upper end face of the sealing convex ring (82).

5. A steam shut-off valve according to claim 1, characterized in that: The thickened sealing arc ring (33) on the front side of the connecting protrusion (31) has a flattening structure (35) at its upper end.

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