Corrugated pipe stop valve with rotary lifting valve rod

Abstract

A corrugated pipe stop valve with a rotary lifting valve rod relates to the field of valves, and comprises a valve body, a valve rod, a valve rod, a valve rod and a valve rod, a valve cover; the valve clack is arranged corresponding to the valve seat; the upper end of the valve rod penetrates through the valve cover to be connected with the driving part, and the lower end is connected with the valve clack to enable the valve clack to act on the valve seat to open and close the channel; the corrugated pipe assembly sleeves the outer side of the valve rod, the lower end of the corrugated pipe assembly is fixedly connected with the valve clack, and the upper end of the corrugated pipe assembly is fixedly connected with the valve cover; a lifting block extending outwards in the circumferential direction is arranged at the lower end of the valve rod, a lifting hole is formed in the valve clack, the lifting block is arranged in the lifting hole, bearings are arranged at the upper end and the lower end or any end of the lifting block, the upper end of the valve clack is fixedly connected with a lower connecting portion of a corrugated pipe assembly, and the lower connecting portion is partially arranged above the lifting block. The valve rod is in contact with the bearing during rotating and lifting, so that the torque of the valve is reduced, the rotating force of the valve rod cannot be transmitted to the valve clack and the corrugated pipe assembly, and the valve clack and the corrugated pipe assembly are prevented from rotating.

Description

Technical Field

[0001] This utility model relates to the field of valves, specifically to a bellows gate valve with a valve stem that rotates and rises. Background Technology

[0002] Currently, throttling gate valves are widely used in pipelines in petrochemical and other industries, providing both throttling and shut-off functions. The typical structure of a throttling gate valve consists of a drive handwheel, valve stem, valve cover, valve body, valve disc, and valve seat. The valve disc and valve seat are located within the valve body, the valve cover is fixed to the valve body, the valve stem passes through the valve cover, and its inner end extends into the valve body and is fixed to the valve disc. The drive handwheel is mounted on the outer end of the valve stem. After the valve is closed, the valve disc and valve seat form a sealing fit.

[0003] Gate valves using bellows sealing structures at the valve stem require the valve stem to move only in a straight line and not rotate, because the bellows assembly will be damaged if it twists, compromising the valve's sealing performance. In existing technologies, the valve stem anti-rotation is achieved using an external limit block, which is complex in structure and becomes less effective after long-term use, making it difficult to guarantee that the valve stem will not rotate. Consequently, the sealing performance at the bellows cannot be guaranteed, affecting the valve's service life. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a bellows stop valve with a valve stem that can rotate and rise.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A bellows gate valve with a rotating and lifting valve stem includes:

[0007] The valve body has a channel for the liquid medium to enter and exit and a valve seat located in the middle of the channel.

[0008] The valve cover is sealed and mounted on the valve body, forming the valve cavity;

[0009] The valve disc is located inside the valve cavity and is positioned correspondingly to the valve seat.

[0010] The valve stem has its upper end passing through the valve cover and connected to the drive component, and its lower end connected to the valve disc, so that the valve disc acts on the valve seat to open and close the channel.

[0011] A bellows assembly is fitted onto the outside of the valve stem, with its lower end fixedly connected to the valve disc and its upper end fixedly connected to the valve cover.

[0012] The lower end of the valve stem is provided with a lifting block extending outward in a circumferential direction. The valve disc is provided with a lifting hole. The lifting block is placed in the lifting hole. The upper and lower ends or any one end of the lifting block is provided with a bearing. The upper end of the valve disc is fixedly connected to the lower connecting part of the bellows assembly, and the lower connecting part is partially positioned above the lifting block.

[0013] The bellows assembly includes:

[0014] The lower connecting part is fixedly connected to the valve disc;

[0015] The upper connecting part is fixedly connected to the valve cover;

[0016] And the corrugated pipe connecting the upper and lower connecting parts.

[0017] The valve disc has a trapezoidal mating part at the bottom, and the mating part has a first sealing structure in the circumferential direction.

[0018] The valve seat has a through hole for communicating channels, the mating part is placed in the through hole, and a second sealing structure is provided at the position where the valve seat contacts the mating part.

[0019] The valve cover includes a middle valve cover and an upper valve cover. The bottom of the middle valve cover is fixedly connected to the valve body, the upper end of the middle valve cover is fixedly connected to the bottom of the upper valve cover, and the upper connecting part of the bellows assembly is fixedly disposed between the middle valve cover and the upper valve cover.

[0020] The bottom of the upper valve cover is provided with a third sealing structure that forms a limiting fit with the valve stem.

[0021] The valve stem includes a lower section placed inside the valve cavity and an upper section that passes through the valve cover. The diameter of the lower section is larger than that of the upper section, and the connection between the two is provided with an inclined surface for forming a limiting fit with the third sealing structure.

[0022] A packing assembly is provided on the upper side of the upper valve cover.

[0023] The packing assembly includes packing, a packing pressure plate, and a cover plate.

[0024] The beneficial effects of this invention are as follows: When the valve stem rotates and rises, it contacts the bearing, which reduces the valve torque and prevents the rotational force of the valve stem from being transmitted to the valve disc and bellows assembly. This prevents the valve disc and bellows assembly from rotating, which could lead to the bellows twisting and breaking. Because the bearing contains fluorinated grease and is located in a sealed space, its service life is extended. Furthermore, when the bellows is damaged, the medium enters the valve cavity, and the grease is flushed out by the medium, causing the valve torque to increase sharply. On-site operators can pre-tighten the valve according to the torque changes to prevent accidents. Attached Figure Description

[0025] Figure 1This is a cross-sectional schematic diagram of the present invention.

[0026] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.

[0027] Figure 3 for Figure 1 Enlarged diagram of point B in the middle. Detailed Implementation

[0028] 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.

[0029] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0030] like Figure 1 As shown, a bellows gate valve with a rotating and lifting valve stem includes a valve body, a valve cover, a valve stem, a valve disc, and a bellows assembly. The valve cover is sealed to the valve body, forming a valve cavity between them. The valve disc is placed in the valve cavity and is linked with the valve stem. The valve stem passes through the valve cover and is linked with an external driving component. The driving component is an electric mechanism, a pneumatic mechanism, or a rotary wheel. In this embodiment, a rotary wheel is used as the driving component.

[0031] The valve body 100 has a channel for liquid medium to enter and exit and a valve seat 130 located in the middle of the channel. The channel is divided into a first channel 110 and a second channel 120 along the direction of liquid medium flow. The valve seat 130 is provided at the connection between the two channels. The valve seat is provided with a through hole that connects the first channel and the second channel.

[0032] The valve cover 200 is sealed and installed on the valve body 100 to form a valve cavity. The valve cover and the valve body are fixed by bolts. The upper surface of the valve body is provided with a positioning countersunk hole in the circumferential direction. The bottom of the valve cover is provided with a positioning block that matches the positioning countersunk hole. The two cooperate to realize the positioning of the valve cover and the valve body. At the same time, the two are fixedly connected by bolts. Preferably, a sealing component, such as a sealing ring, is provided between the positioning block and the positioning countersunk hole to realize the sealing fit between the valve cover and the valve body.

[0033] The valve disc 300 is disposed in the valve cavity and is correspondingly disposed with the valve seat 130. It has a first state of blocking the through hole of the valve seat and a second state of rising and opening the through hole of the valve seat under the action of an external driving component. That is, the valve disc and the valve stem form a linkage assembly, and the linear movement of the valve stem will drive the valve disc to rise or fall.

[0034] The valve stem 400 has its upper end passing through the valve cover 200 and connected to the drive component, and its lower end connected to the valve disc 300, so that the valve disc 300 acts on the valve seat 130 to open and close the channel. At the same time, the valve stem and the valve cover are threaded together, so that the valve stem will not fall off due to the disappearance of external driving force during the rising process.

[0035] The bellows assembly 500 is sleeved on the outside of the valve stem 400, with its lower end fixedly connected to the valve disc 300 and its upper end fixedly connected to the valve cover 200. The presence of the bellows assembly 500 completely isolates the valve stem, preventing it from contacting the liquid medium.

[0036] The lower end of the valve stem 400 is provided with a lifting block 430 extending outward in a circumferential direction. The valve disc 300 is provided with a lifting hole 330. The lifting block 430 is placed in the lifting hole 330. The upper and lower ends or any one end of the lifting block 430 is provided with a bearing 700. The upper end of the valve disc 300 is fixedly connected to the lower connecting part 510 of the bellows assembly 500, and the lower connecting part 510 is partially positioned above the lifting block 430.

[0037] The lower connecting part is welded and fixed to the valve disc, and the lower connecting part is positioned above the lifting block. The lifting block is integrally formed with the valve stem or is set separately, so that when the valve stem rotates and rises, it contacts or indirectly contacts the lower connecting part through the lifting block, thereby driving the valve disc to move upward. The outer side of the lifting block does not directly contact the valve disc, but contacts the valve disc through a bearing. Therefore, its rotation does not directly act on the valve disc, avoiding the rotation of the valve disc during the lifting process. The presence of the bearing reduces the torque of the valve. The bearing can be a needle roller bearing or a ball bearing. In this embodiment, a needle roller bearing is used. Because the needle roller bearing contains fluorinated grease and is also wrapped inside the bellows assembly, the needle roller bearing is in a closed space, which extends the service life of the bearing. When the bellows is damaged, the medium enters and washes away the grease, and the valve torque will increase sharply. The change in valve torque can be used to identify the fault.

[0038] The bellows assembly 500 includes:

[0039] The lower connecting part 510 is fixedly connected to the valve disc 300, and the lower connecting part 510 is directly welded to the valve disc;

[0040] The upper connecting part 520 is fixedly connected to the valve cover 200. The upper connecting part is restricted and fixed by the upper valve cover and the middle valve cover. The upper valve cover presses the upper connecting part onto the middle valve cover.

[0041] And a bellows 530 connecting the upper connecting part 520 and the lower connecting part 510, the bellows covering the outside of the valve stem, completely isolating the fluid medium.

[0042] like Figure 2 As shown, the valve disc 300 has a trapezoidal mating portion 310 at its bottom, and a first sealing structure 320 is provided circumferentially around the mating portion 310. The valve seat 130 has a through hole with a communicating channel, and the mating portion 310 is partially placed in the through hole. A second sealing structure 140 is provided at the position where the valve seat 130 contacts the mating portion 310. The first sealing structure and the second sealing structure can be hard seals or metal seals.

[0043] The valve cover 200 includes a middle valve cover 220 and an upper valve cover 210. The bottom of the middle valve cover 220 is fixedly connected to the valve body 100, and the upper end of the middle valve cover 220 is fixedly connected to the bottom of the upper valve cover 210. The upper connecting part 520 of the bellows assembly 500 is fixedly disposed between the middle valve cover 220 and the upper valve cover 210.

[0044] The middle valve cover and the upper valve cover are fixedly connected by bolts, and the middle valve cover is fixedly connected to the valve body by bolts. At the same time, a support seat is provided above the upper valve cover, and the valve stem passes through the cover support seat and is linked with the drive component located above the support seat. Preferably, the valve stem and the support seat are designed to be threadedly connected.

[0045] like Figure 3 As shown, the bottom of the upper valve cover 210 is provided with a third sealing structure 211 that forms a limiting fit with the valve stem 400. The valve stem 400 includes a lower section 420 placed in the valve cavity and an upper section 410 passing through the valve cover 200. The diameter of the lower section 420 is larger than the diameter of the upper section 410, and the connection between the two is provided with a bevel 440 for forming a limiting fit with the third sealing structure 211. The third sealing structure 211 is designed to provide a sealing fit when the valve stem is opened, and also to limit the maximum opening amount to prevent over-opening.

[0046] Furthermore, a packing assembly 600 is provided on the upper side of the upper valve cover 210. The packing assembly 600 includes packing 610, a packing pressure plate 620, and a cover plate 630. The upper valve cover has a through hole through which the valve stem passes. The upper section of the hole has a slightly larger diameter to accommodate the packing 610. The packing pressure plate is pressed on top of the packing and is fixed by the cover plate. The cover plate is fixedly connected to the upper valve cover by bolts. The design of the packing assembly allows it to provide a seal even if the bellows assembly is damaged. Furthermore, after the lubricating oil in the needle roller bearing is washed away, on-site personnel can detect unexpected situations in time by observing the increase in torque during operation, and thus pre-tighten the tension to prevent accidents.

[0047] The embodiments should not be regarded as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A valve stem rotating and lifting bellows stop valve, comprising: a valve body (100) having a channel for liquid medium to enter and exit and a valve seat (130) arranged in the middle of the channel; a valve cover (200) sealingly mounted on the valve body (100) and forming a valve cavity; a valve disc (300) arranged in the valve cavity and corresponding to the valve seat (130); a valve stem (400) having an upper end connected with a driving part through the valve cover (200) and a lower end connected with the valve disc (300) to make the valve disc (300) act on the valve seat (130) to open and close the channel; and a bellows assembly (500) sleeved on the outer side of the valve stem (400) and fixedly connected with the valve disc (300) at the lower end and fixedly connected with the valve cover (200) at the upper end; characterized in that the lower end of the valve stem (400) is provided with a lifting block (430) extending outward in the circumferential direction, the valve disc (300) is provided with a lifting hole (330), the lifting block (430) is arranged in the lifting hole (330), and the lifting block (430) is provided with a bearing (700) at the upper end or at the lower end or at any one of the two ends, the upper end of the valve disc (300) is fixedly connected with a lower connecting part (510) of the bellows assembly (500), and the lower connecting part (510) is partially arranged above the lifting block (430). The bellows assembly (500) comprises: a lower connecting part (510) fixedly connected with the valve disc (300); an upper connecting part (520) fixedly connected with the valve cover (200); and a bellows (530) connecting the upper connecting part (520) and the lower connecting part (510). The bottom of the valve disc (300) is provided with a trapezoidal matching part (310), and the matching part (310) is provided with a first sealing structure (320) in the circumferential direction. The valve seat (130) is provided with a through hole communicating with the channel, the matching part (310) is partially arranged in the through hole, and the valve seat (130) is provided with a second sealing structure (140) at the position in contact with the matching part (310). The valve cover (200) comprises a middle valve cover (220) and an upper valve cover (210), the bottom of the middle valve cover (220) is fixedly connected with the valve body (100), the upper end of the middle valve cover (220) is fixedly connected with the bottom of the upper valve cover (210), and the upper connecting part (520) of the bellows assembly (500) is fixedly arranged between the middle valve cover (220) and the upper valve cover (210). The bottom of the upper valve cover (210) is provided with a third sealing structure (211) forming a limiting cooperation with the valve stem (400). The valve stem (400) comprises a lower section (420) arranged in the valve cavity and an upper section (410) arranged through the valve cover (200), the diameter of the lower section (420) is greater than the diameter of the upper section (410), and the connecting part of the two sections is provided with a slope (440) for forming a limiting cooperation with the third sealing structure (211).

2. A valve stem rotary-lift bellows stop valve according to claim 1, characterized in that: The upper side of the upper valve cover (210) is provided with a packing assembly (600). The packing assembly (600) comprises a packing (610), a packing pressing plate (620) and a cover plate (630). ​ ​ 3. A valve stem rotary-lift bellows stop valve as defined in claim 1, wherein: ​ 4. A valve stem rotary-lift bellows stop valve as defined in claim 3, wherein: ​ 5. A valve stem rotary lift bellowed globe valve in accordance with claim 1 wherein: ​ 6. A valve stem rotary-lift bellows stop valve as defined in claim 5, wherein: ​ 7. A valve stem rotary-lift bellows stop valve as defined in claim 6 wherein: ​ 8. A valve stem rotary-lift bellows stop valve as defined in claim 5, wherein: ​ 9. A valve stem rotary-lift bellows stop valve as defined in claim 8, wherein: ​

Images