Double-gate-plate gate valve casting

Abstract

The double-gate-plate gate valve casting comprises a gate bin, a rotating rod and a connecting disc, a front flange and a rear flange are arranged at the two ends of the gate bin, a main gate plate is arranged in the gate bin, and gate plate wear-resisting pieces are arranged on the sealing faces of the front end of the main gate plate and the front flange and the rear flange. Cast steel linings are arranged in the front flange and the rear flange at the two ends, and one end of the flashboard wear-resisting piece makes contact with the cast steel linings. Through the arrangement of the flashboard wear-resisting pieces and the cast steel lining structure, in the rotating process of the internal rotating rod, the main flashboard at the bottom end of the flashboard rotates in the gate bin, the flashboard wear-resisting pieces on the two sides make contact with the cast steel lining, and compared with an existing direct hard contact mode, the flashboard wear-resisting pieces make contact with the cast steel lining, and the flashboard wear-resisting pieces make contact with the cast steel lining. The influence of abrasion caused by an original contact mode can be reduced, and the service time is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of gate valve castings, in particular to a double-disc gate valve casting. Background Art

[0002] The gate valve is a gate that opens and closes. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate valve is sealed by the contact between the valve seat and the gate, and large-diameter gate valves are usually cast in one piece to improve strength. The parallel double-disc gate valve has good wear resistance.

[0003] The existing wear-resistant slag discharge gate valve includes a valve body, a valve cover, a valve stem, a bracket and a gate plate. The valve body includes a main valve body and a left valve body connected to the left port of the main valve body. The gate plate is connected to the lower end of the valve stem and matches the valve seat on the main valve body. The valve cover is connected to the upper part of the main valve body. The valve stem passes through the center of the valve cover and is located in the bracket. The valve stem and the valve cover are sealed by packing. A connecting plate is provided at the upper end of the valve stem. The disadvantages are that the valve body adopts an integral structure. If the valve body adopts wear-resistant materials, the pressure bearing capacity is poor; if low-carbon steel castings are used, the pressure bearing capacity is good, but it is not wear-resistant. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the utility model provides a double-gate gate valve casting. Through the gate wear-resistant sheet and cast steel lining structure, during the rotation of the internal rotating rod, the main gate at its bottom end rotates in the gate chamber, and the gate wear-resistant sheets on both sides are in contact with the cast steel lining. Compared with the existing direct hard contact method, the influence of wear caused by the original contact method can be reduced and the service life can be extended.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a double-gate gate valve casting, including a gate chamber, a rotary rod and a connecting plate, a front flange and a rear flange are arranged at both ends of the gate chamber, a main gate plate is arranged inside the gate chamber, a gate plate wear-resistant sheet is arranged at the sealing surface between the front end of the main gate plate and the front flange and the rear flange, cast steel liners are arranged in the front flange and the rear flange at both ends, one end of the gate plate wear-resistant sheet is in contact with the cast steel liners, the inner sides of the front flange and the rear flange are both provided with outer grooves inwardly, and a positioning hole is opened in the middle of each group of the outer grooves.

[0006] As a preferred technical solution of the utility model, a gate bolt is arranged in the middle of the main gate.

[0007] As a preferred technical solution of the utility model, the cast steel liner is a hollow tubular structure, and an outer ring is arranged on the outer side of one end thereof, and the outer ring is arranged on the contact surface between the gate chamber and the front flange (2) and the rear flange.

[0008] As a preferred technical solution of the utility model, a flange is provided on the outer side of the rotary rod, and the upper and lower ends of the flange are fixedly connected to the gate chamber.

[0009] As a preferred technical solution of the utility model, a connecting hole is opened in the middle of the outer ring of the cast steel liner, a locking bolt is arranged in the connecting hole, and the cast steel liner is fixedly connected to the front flange and the rear flange on both sides by the locking bolt passing through the connecting hole and the positioning hole.

[0010] As a preferred technical solution of the utility model, a high-chromium steel lining is provided on the inner side of the gate chamber.

[0011] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0012] 1. In this device, by setting the gate wear-resistant sheet and cast steel lining structure, during the rotation of the internal rotary rod, the main gate at its bottom end rotates in the gate chamber, and the gate wear-resistant sheets on both sides are in contact with the cast steel lining, which can reduce the impact of wear caused by the original contact method and extend the service life compared with the existing direct hard contact method.

[0013] 2. In this device, by opening connection holes and positioning hole structures in the cast steel liner and the front flange and the rear flange, and connecting and fixing the two by locking bolts, the connection effect between the two is improved. In addition, the cast steel liner can also be quickly disassembled and assembled, and the multiple sets of locking bolts on the outside can realize the tightening function. When disassembling, they are located on the outside, which is also convenient for on-site disassembly. Users can also install the cast steel liner with specified functions through this structure according to specific use requirements, so as to meet the requirements of convenient actual use on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a half-side cross-sectional view of the utility model;

[0016] Figure 3 This is a schematic diagram of the cast steel lining structure of the utility model;

[0017] Figure 4 It is a structural schematic diagram of the rear flange of the utility model.

[0018] Among them: 1. Gate chamber; 2. Front flange; 21. Outer groove; 22. Positioning hole; 3. Rear flange; 4. Flange; 5. Handwheel; 6. Rotary rod; 7. Main gate; 8. Gate bolt; 9. Gate wear plate; 10. Cast steel lining; 101. Outer ring; 102. Connecting hole; 103. Locking bolt. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, purpose and efficacy of the utility model easy to understand, the utility model is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the utility model, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the utility model. The experimental methods in the following embodiments are conventional methods unless otherwise specified, and the materials, reagents, etc. used in the following embodiments are all commercially available unless otherwise specified.

[0020] Embodiment:

[0021] like Figure 1-4 As shown, the utility model provides a double-disc gate valve casting, including a gate chamber 1, a rotary rod 5 and a connecting plate 6, a front flange 2 and a rear flange 3 are arranged at both ends of the gate chamber 1, a main gate plate 7 is arranged inside the gate chamber 1, a gate plate wear sheet 9 is arranged at the sealing surface between the front end of the main gate plate 7 and the front flange 2 and the rear flange 3, cast steel liners 10 are arranged in the front flanges 2 and the rear flanges 3 at both ends, one end of the gate plate wear sheet 9 is in contact with the cast steel liners 10, outer grooves 21 are opened inwardly on the inner sides of the front flange 2 and the rear flange 3, and a positioning hole 22 is opened in the middle of each group of outer grooves 21.

[0022] In other embodiments, a gate bolt 8 is provided in the middle of the main gate 7 .

[0023] In other embodiments, the cast steel liner 10 is a WCB low-carbon steel casting, the gate wear sheet 9 is Cr20 cast steel, a flange 4 is provided on the outer side of the rotary rod 5, and the upper and lower ends of the flange 4 are fixedly connected to the gate chamber 1, a connecting hole 102 is opened in the middle of the outer ring 101 of the cast steel liner 1, a locking bolt 103 is provided in the connecting hole 102, and the cast steel liner 10 is fixedly connected to the front flange 2 and the rear flange 3 on both sides through the locking bolt 103 penetrating the connecting hole 102 and the positioning hole 22; through the gate wear sheet 9 and the cast steel liner 10 structure, during the rotation of the internal rotary rod 6, the main gate 7 at its bottom end rotates in the gate chamber 1, and the gate wear sheets 9 on both sides and the cast steel liner The contact between the inner liner 10 and the front flange 2 and the rear flange 3 can reduce the wear caused by the original contact mode and extend the service life. By providing a connecting hole 102 and a positioning hole 22 structure in the cast steel inner liner 10 and the front flange 2 and the rear flange 3, and connecting and fixing the two with locking bolts 103, the connection effect between the two is improved. In addition, the quick disassembly and assembly effect of the cast steel inner liner 10 can also be met, and the multiple sets of locking bolts 103 on the outside can realize the fastening function. When disassembling, they are located on the outside, which is also convenient for on-site disassembly. The user can also install the cast steel liner 10 with specified functions through this structure according to specific use requirements, so as to meet the requirements of convenient actual use on site.

[0024] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A double-disc gate valve casting, comprising a gate chamber (1), a rotary rod (5) and a connecting plate (6), characterized in that: A front flange (2) and a rear flange (3) are provided at both ends of the gate chamber (1); a main gate plate (7) is provided inside the gate chamber (1); a gate plate wear plate (9) is provided at the front end of the main gate plate (7) and the sealing surface between the front flange (2) and the rear flange (3); cast steel liners (10) are provided in the front flange (2) and the rear flange (3) at both ends; one end of the gate plate wear plate (9) contacts the cast steel liners (10); outer grooves (21) are provided inwardly on the inner sides of the front flange (2) and the rear flange (3), and a positioning hole (22) is provided in the middle of each group of the outer grooves (21).

2. A double-disc gate valve casting according to claim 1, characterized in that: A gate bolt (8) is arranged in the middle of the main gate (7).

3. A double-disc gate valve casting according to claim 1, characterized in that: The cast steel liner (10) is a hollow tubular structure, and an outer ring (101) is arranged on the outside of one end thereof. The outer ring (101) is arranged on the contact surfaces between the gate chamber (1) and the front flange (2) and the rear flange (3).

4. A double-disc gate valve casting according to claim 1, characterized in that: A flange (4) is provided on the outer side of the rotary rod (5), and the upper and lower ends of the flange (4) are fixedly connected to the gate chamber (1).

5. A double-disc gate valve casting according to claim 1, characterized in that: A connecting hole (102) is provided in the middle of the outer ring (101) of the cast steel liner (10), a locking bolt (103) is arranged in the connecting hole (102), and the cast steel liner (10) is fixedly connected to the front flange (2) and the rear flange (3) on both sides by the locking bolt (103) penetrating the connecting hole (102) and the positioning hole (22).

6. A double-disc gate valve casting according to claim 1, characterized in that: A high-chromium steel lining is provided on the inner side of the gate chamber (1).

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