Top-mounted hard sealing ultralow-temperature butterfly valve

Abstract

The utility model discloses a top-mounted hard seal ultra-low temperature butterfly valve, which comprises a valve body, a valve cover, a butterfly plate and a valve shaft, the valve cover is fixed on the valve body through a bolt, the valve body is provided with a mounting port opposite to the valve cover, the valve cover is further provided with a secondary cover fixed through a bolt, and the valve shaft is provided with a split snap ring penetrating through the secondary cover and the valve cover. The valve shaft and the butterfly plate are in circumferential linkage through a flat key structure, and a valve seat is further arranged in the valve body. According to the top-mounted butterfly valve, due to the fact that the upper side valve cover mounting opening is formed, a worker can dismount the upper valve cover and then stretch into the valve body to dismount, mount and maintain sealing structures such as an internal butterfly plate, and the top-mounted butterfly valve is simple in structure and convenient to dismount and mount.

Description

TECHNICAL FIELD

[0001] The utility model relates to butterfly valve technical field, concretely relates to an upper hard sealing ultra low temperature butterfly valve of mounting type. BACKGROUND

[0002] The butterfly valve is also called flap valve, and it is a simple structure regulating valve, and the butterfly valve is used for the on-off control of low-pressure pipeline medium, and the butterfly valve is a valve with a disc-shaped closing element (valve disc or butterfly plate) rotating around a valve shaft to achieve opening and closing, and the butterfly valve mainly plays a role of cutting off and throttling in the pipeline. The sealing of the existing butterfly valve is basically realized by cooperation of the butterfly plate and the valve body, especially in the hard sealing structure, since the wear of the butterfly plate and the valve body is large during rotation, the butterfly plate is prone to failure in the use environment with large fluid pressure, so the butterfly plate needs to be replaced frequently, thereby increasing the maintenance frequency and maintenance cost.

[0003] The existing low temperature butterfly valve needs to disassemble the flange part and the valve cover to maintain the inside of the valve body, and the inside butterfly plate assembly is disassembled from the medium inlet and outlet, when the valve inner part is damaged seriously or the valve diameter is small, the maintenance work is not easy to carry out, and the maintenance cycle is long, which causes waste of user cost. The sealing valve seat is mostly of integral type, which is not conducive to processing and later maintenance work, thereby reducing the reliability and maintainability of the valve operation. UTILITY MODEL CONTENTS

[0004] In view of the prior art, the utility model aims at providing an upper hard sealing ultra low temperature butterfly valve of mounting type, which has simple structure, and the valve body inside butterfly plate assembly and valve seat can be disassembled from the valve cover during maintenance, thereby facilitating maintenance.

[0005] In order to achieve the above purpose, the utility model adopts the technical scheme that an upper hard sealing ultra low temperature butterfly valve of mounting type, comprising a valve body, a valve cover, a butterfly plate and a valve shaft, the valve cover is bolted on the valve body, the valve body is provided with a mounting port relative to the valve cover, and a secondary cover bolted on the valve cover is further provided, the valve shaft penetrates the secondary cover and the valve cover and is provided with a split clasp, the valve shaft and the butterfly plate are circumferentially linked by a flat key structure, and a valve seat is further arranged in the valve body.

[0006] As a further setting of the above scheme, an upper shaft sleeve and a lower shaft sleeve are arranged between the valve shaft and the valve body, and a limiting sleeve is arranged between the end of the upper shaft sleeve and the lower shaft sleeve and the butterfly plate.

[0007] As a further setting of the above scheme, a bracket with a worm gear actuator fixed thereon is further arranged on the secondary cover.

[0008] As a further setting of the above scheme, a packing, a packing ring, a pressing sleeve and a pressing cover are arranged on the secondary cover and are sleeved on the valve shaft, and the pressing cover is further provided with a fixing bolt for installation and fixation.

[0009] As a further arrangement of the above-mentioned scheme, the valve seat is fixedly installed in the valve body by bolts, the sealing surface of the valve seat is oppositely arranged with the sealing surface of the butterfly plate, and the end of the fixing bolt of the valve seat is arranged towards the valve shaft direction.

[0010] As a further arrangement of the above-mentioned scheme, the valve body is provided with a mounting portion, the valve seat is fixedly installed in the mounting portion by bolts, and the fixing bolt of the valve seat penetrates through the mounting portion away from the butterfly plate and is connected to the valve seat by bolts.

[0011] As a further arrangement of the above-mentioned scheme, the butterfly plate is provided with a sealing ring and a pressing ring, the pressing ring is fixed to the butterfly plate by screws, and the sealing ring is clamped by the body of the butterfly plate.

[0012] As a further arrangement of the above-mentioned scheme, the bottom of the valve body is provided with a bottom cover, and the lower end of the valve shaft is arranged to extend into the bottom cover.

[0013] Beneficial effects: the upper-mounted butterfly valve of the utility model, through the arrangement of the upper valve cover installation port, the staff can disassemble the upper valve cover, and then disassemble and maintain the internal butterfly plate and other sealing structures in the valve body, which is simple in structure and convenient to disassemble and assemble. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic diagram of the butterfly valve structure of the utility model.

[0015] Figure 2 It is a vertical sectional view of the butterfly valve of embodiment 1 of the utility model.

[0016] Figure 3 It is a horizontal sectional view of the butterfly valve of embodiment 1 of the utility model.

[0017] Figure 4 It is a schematic diagram of the structure of embodiment 2 of the utility model.

[0018] Mark: 2, bottom cover; 3, lower shaft sleeve; 4, valve body; 5, sealing ring; 6, pressing ring; 7, butterfly plate; 8, valve shaft; 9, flat key structure; 10, limiting sleeve; 11, valve seat; 13, upper shaft sleeve; 14, valve cover; 15, valve cover bolt; 16, split clasp; 17, secondary cover; 18, mounting port; 19, packing ring; 20, packing; 21, pressing sleeve; 22, gland; 23, fixing bolt; 24, support; 25, worm gear actuator; 41, mounting portion. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned purposes, features and advantages of the utility model, the utility model will be further described in detail below in combination with the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0020] As Figures 1-3 The upper hard sealing ultra-low temperature butterfly valve shown in the figure, including valve body 4, valve cover 14, butterfly plate 7 and valve shaft 8, the valve cover 14 is bolted on the valve body 4, the valve body 4 is provided with a mounting port 18 opposite the valve cover 14, the valve cover 14 is further provided with a bolted secondary cover 17, the valve shaft 8 penetrates the secondary cover 17 and is provided with a split clasp ring 16 at the valve cover 14, the valve shaft 8 and the butterfly plate 7 are connected in the circumferential direction by means of a flat key structure 9, and the valve body 4 is further provided with a valve seat 11.

[0021] As the above structure is provided, based on the secondary cover 17, when installed, the split clasp ring 16 in the middle of the valve shaft 8 is clamped between the secondary cover 17 and the valve cover 14, so that when the valve cover 14 is disassembled relative to the valve body 4, the valve cover 14 with the secondary cover 17 and the worm gear actuator 25 above and the valve shaft 8 are separated from the valve body 4, and when installed, the butterfly plate 7 is inserted and connected in the circumferential direction by means of the flat key structure 9.

[0022] As a further arrangement of the above scheme, the upper shaft sleeve 13 and the lower shaft sleeve 3 are provided between the valve shaft 8 and the valve body 4, and the limit sleeve 10 is provided between the end of the upper shaft sleeve 13 and the lower shaft sleeve 3 and the butterfly plate 7.

[0023] As a further arrangement of the above scheme, the secondary cover 17 is further provided with a bracket 24 fixed with a worm gear actuator 25.

[0024] As a further arrangement of the above scheme, the secondary cover 17 is provided with a packing 20, a packing ring 19, a pressing sleeve 21 and a gland 22 sleeved on the valve shaft 8, and the gland 22 is further provided with a fixing bolt 23 for installation and fixation.

[0025] As a further arrangement of the above scheme, the butterfly plate 7 is provided with a sealing ring 5 and a pressing ring 6, the pressing ring 6 is fixed on the butterfly plate 7 by means of screws, and the sealing ring 5 is clamped between the body of the butterfly plate 7 and the pressing ring 6.

[0026] As a further arrangement of the above scheme, the bottom of the valve body 4 is provided with a bottom cover 2, and the lower end of the valve shaft 8 extends into the bottom cover 2.

[0027] As a further arrangement of the above scheme, the valve seat 11 is bolted and installed in the valve body 4, and the sealing surface 111 of the valve seat 11 is arranged opposite the sealing surface 111 of the butterfly plate 7.

[0028] As a further arrangement of the above scheme, the valve body 4 is provided with a mounting portion 41, the valve seat 11 is bolted to the mounting portion 41, and the fixing bolt of the valve seat 11 penetrates the mounting portion 41 away from the butterfly plate 7 and is bolted to the valve seat 11.

[0029] Embodiment 1

[0030] Reference Figures 1-3 The upper-mounted butterfly valve illustrated in the utility model, when being maintained and disassembled, can be disassembled from the valve cover 14 of the valve, facilitating maintenance and repair, and only the valve cover bolt 15 on the valve cover 14 needs to be removed, and then the valve cover 14 can be pulled out with the valve shaft 8, and the flat key structure 9 on the valve shaft 8 is pulled out at the same time, and the butterfly plate 7 is released from the restraint after the valve shaft 8 is pulled out, and the staff can reach into the inner cavity of the valve body 4 from the mounting port 18 of the valve body 4, and then the butterfly plate 7, the upper shaft sleeve 13 and the limiting sleeve 10 in the inner cavity are removed, and then the sealing ring 5 is disassembled by removing the screw on the butterfly plate 7, and then the fixing bolt is disassembled by reaching into the medium flow channel side of the valve end, and then the valve seat 11 assembly is disassembled and taken out from the mounting port 18, and then the bottom cover 2 is disassembled, and then the lower shaft sleeve 3 is disassembled, and after being cleaned and maintained, the staff can install it in reverse, and the installation process includes that the valve seat 11 is installed relative to the mounting portion 41, then the valve shaft 8 is connected with the butterfly plate 7 through the flat key structure 9, and then the valve shaft 8 is inserted into the mounting port 18 and is installed relative to the valve seat 11, and in this process, the upper shaft sleeve 13, the lower shaft sleeve 3 and the limiting sleeve 10 need to be assembled, and finally the bottom cover 2 and the valve cover 14 are fixed.

[0031] Embodiment 2

[0032] As a further arrangement of the above-mentioned scheme, the utility model also sets another fixing mode of the valve seat 11, and the difference between the embodiment 2 and the embodiment 1 is that the fixing bolt end of the valve seat 11 of the embodiment 2 is arranged towards the valve shaft 8 direction, and as shown in the drawing, the arrangement scheme can realize that the maintenance personnel does not need to disassemble the connecting flange end of the pipeline and the valve, and the worker can disassemble and maintain the valve seat 11 through the special tool from the mounting port 18. Figure 4

[0033] Obviously, those skilled in the art can make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model belong to the scope of the utility model scheme and equivalent technologies, the utility model also intends to include these modifications and variations.​

Claims

1. An upper-mounted hard-seal ultra-low temperature butterfly valve comprising a valve body (4), a valve cover (14), a butterfly plate (7) and a valve shaft (8), characterized in that: The valve cover (14) is bolted on the valve body (4), the valve body (4) is provided with a mounting port (18) relative to the valve cover (14), the valve cover (14) is further provided with a bolted secondary cover (17), the valve shaft (8) penetrates the secondary cover (17) and is provided with a split clasp (16) relative to the valve cover (14), the valve shaft (8) and the butterfly plate (7) are circumferentially linked by a key structure (9), and the valve body (4) is further provided with a valve seat (11).

2. A hard-sealed, ultra-low temperature butterfly valve according to claim 1, wherein: The upper shaft sleeve (13) and the lower shaft sleeve (3) are arranged between the valve shaft (8) and the valve body (4), and the limit sleeve (10) is arranged between the end of the upper shaft sleeve (13) and the lower shaft sleeve (3) and the butterfly plate (7).

3. The top-mounted hard-seal ultra-low temperature butterfly valve according to claim 1, characterized in that: The secondary cover (17) is further provided with a bracket (24) fixed with a worm gear actuator (25).

4. The top-mounted hard-seal ultra-low temperature butterfly valve of claim 1, wherein: The secondary cover (17) is provided with a packing (20), a packing ring (19), a pressing sleeve (21) and a gland (22) sleeved on the valve shaft (8), and the gland (22) is further provided with a fixing bolt (23) for installation and fixation.

5. A top entry hard seal ultra-low temperature butterfly valve as claimed in claim 1, wherein: The valve seat (11) is bolted and installed in the valve body (4), the sealing surface (111) of the valve seat (11) is arranged opposite to the sealing surface (111) of the butterfly plate (7), and the end of the fixing bolt of the valve seat (11) is arranged towards the valve shaft (8).

6. A top entry hard-sealed ultra-low temperature butterfly valve as claimed in claim 1, wherein: The valve body (4) is provided with a mounting portion (41), the valve seat (11) is bolted on the mounting portion (41), and the fixing bolt of the valve seat (11) penetrates the mounting portion (41) away from the butterfly plate (7) and is bolted on the valve seat (11).

7. A top entry hard seal ultra-low temperature butterfly valve as claimed in claim 1, wherein: The butterfly plate (7) is provided with a sealing ring (5) and a pressing ring (6), the pressing ring (6) is fixed on the butterfly plate (7) by a screw, and the sealing ring (5) is clamped and arranged between the butterfly plate (7) and the body.

8. The top-mounted hard-seal ultra-low temperature butterfly valve of claim 1, wherein: The bottom of the valve body (4) is provided with a bottom cover (2), and the lower end of the valve shaft (8) extends into the bottom cover (2).

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