Split large-bore piston valve body

Abstract

The utility model relates to piston valve technical field, concretely is a split big aperture piston valve body, solved the problem that the background art has proposed, it includes big valve body and small valve body, and the butt -joint end of big valve body and small valve body is equipped with mutually matched big valve body flange and small valve body flange respectively, and big valve body flange and small valve body flange are fixedly connected through connecting bolt, and the butt -joint port of big valve body and small valve body is equipped with mutually matched positioning stop mouth, and the butt -joint end face of big valve body flange and small valve body flange is provided with sealing groove, and it is provided with O type sealing ring in it, and big valve body includes outer body cylinder and inner body cylinder, and the inner hole of inner body cylinder constitutes the flow passage main body of valve, and the outer body cylinder is fixedly connected with the inner body cylinder through a plurality of circumferentially evenly distributed rib plates. The utility model, through split structure design, divides the nominal diameter DN2400 valve body into big valve body and small valve body, adopts positioning stop mouth to guarantee flow passage size accuracy and coaxiality after assembly, and ensures that the flow surface shape meets the design requirement.

Description

Technical Field

[0001] This utility model relates to the field of piston valve technology, specifically to a valve body for a split-type large-diameter piston valve. Background Technology

[0002] A piston-type flow control valve is a device that changes the pressure difference by adjusting the opening of a throttling element inside the valve, thereby achieving precise control of the flow and pressure in a pipeline system. This type of valve has advantages such as excellent regulating characteristics, high control precision, good dynamic vibration resistance, and effective prevention of cavitation damage. It is widely used in fluid control systems in fields such as water conservancy, water supply and drainage, and power plants.

[0003] As a key pressure-bearing and flow-through component of such valves, the shape and dimensional accuracy of the internal flow channels are crucial indicators for ensuring the valve achieves its expected regulating performance, reducing flow resistance and vibration, and preventing cavitation. Currently, piston valves with large nominal diameters generally adopt an integral casting structure. However, for ultra-large diameter valve bodies (e.g., DN2400 and above), this traditional structure exposes many technical challenges: First, due to its large size and complex structure, especially the complex shape of the flow surface and the small and long gap between the inner and outer cylinders, casting defects such as cracks and shrinkage cavities are easily generated during the casting process. These defects are difficult to treat internally after they occur, ultimately making it difficult to guarantee the design requirement of a smooth transition of the flow surface. Second, the integral valve body is extremely heavy and tall, placing extremely stringent requirements on casting equipment, lifting capacity, and machining equipment (such as large CNC vertical lathes), significantly increasing manufacturing difficulty and cost. Finally, the overall transport dimensions and weight of the assembled valve exceed limits, further restricting its production and application. Utility Model Content

[0004] To solve the above problems, this utility model provides the following technical solution: a split-type large-diameter piston valve body, including a large valve body and a small valve body. The mating ends of the large valve body and the small valve body are respectively provided with mutually cooperating large valve body flanges and small valve body flanges. The large valve body flanges and the small valve body flanges are fixedly connected by connecting bolts. The mating ports of the large valve body and the small valve body are also provided with mutually cooperating positioning stops for achieving radially precise positioning of the large valve body and the small valve body. A sealing groove is opened on the mating end face of the large valve body flange and the small valve body flange. An O-ring is provided in the sealing groove. The large valve body includes an outer body cylinder and an inner body cylinder arranged coaxially. The inner hole of the inner body cylinder forms the main body of the valve flow channel. The outer body cylinder and the inner body cylinder are fixedly connected by multiple circumferentially evenly distributed ribs. The outer body cylinder, the inner body cylinder and the ribs together form a reinforcing cavity surrounding the inner body cylinder.

[0005] The nominal diameter of the valve body of the split-type large-diameter piston valve is DN2400.

[0006] The axial length of the large valve body is less than or equal to 2.8 meters.

[0007] The rib extends along the axial direction of the large valve body, and its radial cross-sectional shape is streamlined or airfoil-shaped.

[0008] The large valve body and the small valve body are integrally cast parts.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] The valve body, with a nominal diameter of DN2400, is divided into a large valve body and a small valve body through a segmented structural design. A locating stop ensures the dimensional accuracy and coaxiality of the flow channel after assembly, guaranteeing that the shape of the flow surface meets design requirements. This structure effectively reduces the size and weight of individual castings, improves casting processability, reduces the probability of casting defects, and simultaneously reduces machining difficulty and equipment requirements, solving the technical challenges of casting, machining, and transporting integral large-diameter valve bodies. Attached Figure Description

[0011] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0012] Fig. 1 This is a schematic cross-sectional view of the overall structure of this utility model;

[0013] Fig. 2 This is a front view structural diagram of the large valve body of this utility model;

[0014] Fig. 3 This is a side view of the large valve body of this utility model.

[0015] In the diagram: 1. Large valve body; 101. Large valve body flange; 102. Outer cylinder; 103. Inner cylinder; 104. Rib plate; 105. Reinforcing cavity; 2. Small valve body; 201. Small valve body flange; 3. Connecting bolts; 4. O-ring seal. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0017] like Figs. 1 to 3As shown in the figure, the valve body of a split-type large-diameter piston valve in this embodiment is mainly composed of a large valve body 1, a small valve body 2, connecting bolts 3 and O-ring seals 4.

[0018] The large valve body 1 and the small valve body 2 are respectively provided with a large valve body flange 101 and a small valve body flange 201 that mate with each other. The large valve body flange 101 and the small valve body flange 201 are fastened together by a number of high-strength alloy steel connecting bolts 3 and nuts, thereby firmly combining the large valve body 1 and the small valve body 2 into a complete valve body structure.

[0019] To achieve rapid and precise alignment when connecting the large valve body 1 and the small valve body 2, and to ensure the continuity and coaxiality of the internal flow channels, mutually matching positioning stops are provided at their mating ports. Specifically, a raised annular male stop can be designed on the end face of the large valve body flange 101, and a corresponding annular female stop with an interference fit can be designed on the small valve body flange 201. During assembly, the male stop is precisely embedded in the female stop, thereby achieving precise radial positioning of the large valve body 1 and the small valve body 2, effectively preventing relative misalignment of the two components after connection.

[0020] To ensure reliable sealing at the split interface and prevent media leakage, an annular sealing groove is machined on the mating end face of the large valve body flange 101 (or the end face of the small valve body flange 201). An O-ring 4 made of nitrile rubber or fluororubber is embedded within the sealing groove. When the connecting bolts 3 are tightened, the two flange end faces press and compress the O-ring 4, causing it to elastically deform, thereby forming a reliable static seal at the split interface.

[0021] The large valve body 1 is the core component of this invention, and its structure includes an outer cylinder 102 and an inner cylinder 103 arranged coaxially. The inner bore of the inner cylinder 103 forms the main part of the valve flow channel. The outer cylinder 102 and the inner cylinder 103 are fixedly connected by welding or integral casting through multiple circumferentially evenly distributed ribs 104. These ribs 104 not only support and connect the inner and outer cylinders, but also, together with the outer cylinder 102 and the inner cylinder 103, form a closed annular reinforcing cavity 105. This reinforcing cavity 105 is not a flow channel, but a structural reinforcement area that enhances the overall rigidity and strength of the valve body, enabling it to withstand extremely high pipeline stress and fluid pressure, and preventing the valve body from deforming under high-pressure conditions.

[0022] In this embodiment, the nominal diameter of the split-type large-diameter piston valve body is DN2400. Through the split design, the valve body, originally exceeding 3.8 meters in overall length, is divided into two parts. The axial length of the large valve body 1 is optimized to 2.8 meters. This dimension reduces the casting and heat treatment difficulty of a single casting, decreases the probability of casting defects (such as cracks and shrinkage cavities), and also reduces the requirements for large machine tools and other processing equipment, making processing more convenient.

[0023] To further optimize fluid performance and reduce flow resistance, the rib 104 extends axially along the large valve body 1, and its radial cross-sectional shape is designed to be streamlined or airfoil-shaped. This shape can effectively guide the fluid to pass smoothly, avoiding the generation of eddies and severe pressure loss.

[0024] Both the large valve body 1 and the small valve body 2 are preferably manufactured using a one-piece casting process, and the material can be cast carbon steel or stainless steel of grades such as WCB and CF8M. One-piece casting ensures the structural integrity and strength of the components, and precision machining after casting ensures the dimensional accuracy and surface finish of each mating surface (such as flange end face, stop, and sealing groove).

[0025] Assembly process:

[0026] First, place the O-ring 4 into the sealing groove of the large valve body flange 101; then, hoist the small valve body 2 and guide it with the positioning stop to precisely align it with the large valve body 1; next, insert the connecting bolts 3 and pre-tighten them; finally, use a torque wrench to tighten all the connecting bolts 3 to the specified torque in a diagonal sequence to ensure that the flange surface is evenly pressed against the O-ring 4, thus completing the assembly.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A split-type large-diameter piston valve body, comprising a large valve body (1) and a small valve body (2), characterized in that, The large valve body (1) and the small valve body (2) are respectively provided with a large valve body flange (101) and a small valve body flange (201) that cooperate with each other. The large valve body flange (101) and the small valve body flange (201) are fixedly connected by connecting bolts (3). The docking ports of the large valve body (1) and the small valve body (2) are also provided with mutually cooperating positioning stops to achieve precise radial positioning of the large valve body (1) and the small valve body (2). The docking end faces of the large valve body flange (101) and the small valve body flange (201) are... A sealing groove is provided, and an O-ring (4) is provided in the sealing groove. The large valve body (1) includes an outer body cylinder (102) and an inner body cylinder (103) arranged coaxially. The inner hole of the inner body cylinder (103) forms the main body of the valve flow channel. The outer body cylinder (102) and the inner body cylinder (103) are fixedly connected by multiple circumferentially evenly distributed ribs (104). The outer body cylinder (102), the inner body cylinder (103) and the ribs (104) together form a reinforcing cavity (105) surrounding the inner body cylinder (103).

2. The valve body of a split-type large-diameter piston valve according to claim 1, characterized in that: The nominal diameter of the valve body of the split-type large-diameter piston valve is DN2400.

3. The valve body of a split-type large-diameter piston valve according to claim 1, characterized in that: The axial length of the large valve body (1) is less than or equal to 2.8 meters.

4. The valve body of a split-type large-diameter piston valve according to claim 1, characterized in that: The rib (104) extends along the axial direction of the large valve body (1), and its radial cross-sectional shape is streamlined or airfoil-shaped.

5. The valve body of a split-type large-diameter piston valve according to claim 1, characterized in that: The large valve body (1) and the small valve body (2) are integrally cast parts.

Images