Stop valve with guide valve clack

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a stop valve with a guide valve clack. The stop valve comprises a valve body, a valve cover and a valve rod, an opening is formed in the top of the valve body, and the lower end of the valve rod extends into the valve body from the opening and is connected with a valve clack. The valve cover is sealed at the opening so as to seal the valve rod; a valve seat opening is formed in the valve body and communicated with an inlet flow channel and an outlet flow channel at the two ends of the valve body. A guide rod is installed on the upper surface of the valve seat opening, a limiting guide ring is connected to the top of the guide rod, a movable block is installed on the outer surface of the valve clack, and the movable block is in sliding connection with the limiting guide ring. According to the stop valve, the limiting guide ring and the movable block are matched with each other, the lifting motion of the valve clack is guided, the oblique impact of high-pressure fluid on the valve clack can be reduced, the valve clack is prevented from inclining when the valve seat opening is sealed, and the sealing performance of the stop valve with the guided valve clack is stable.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a stop valve with a guide valve disc. Background Technology

[0002] The opening and closing element of a gate valve is a plug-shaped valve disc, with a sealing surface that is either flat or conical. The valve disc moves linearly along the centerline of the fluid. The valve stem can move in two ways: a rising stem type (the valve stem rises and falls, but the handwheel does not) or a rising and rotating stem type (the handwheel and valve stem rotate and rise together, with the nut located on the valve body). Gate valves are only suitable for fully open and fully closed applications and are not permitted for regulation or throttling.

[0003] However, during pipeline operation, the fluid under high pressure has greater energy and flow velocity, which will impact the valve disc when it flows through the gate valve. If the valve disc is not guided and positioned, it is easy to tilt, which will affect the sealing performance when the valve disc is closed. Further improvements are necessary. Utility Model Content

[0004] The purpose of this invention is to provide a gate valve with a guided valve disc to solve the problem that gate valves in the prior art are prone to tilting due to media impact, which leads to a decrease in the valve's sealing performance.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A gate valve with a guide valve disc includes a valve body, a valve cover, and a valve stem. The valve body has an opening at its top, and the lower end of the valve stem extends into the valve body through the opening and is connected to a valve disc. The valve cover seals the valve stem at the opening. A valve seat is provided within the valve body, connecting an inlet flow channel and an outlet flow channel at both ends of the valve body. A guide rod is mounted on the upper surface of the valve seat, and a limiting guide ring is connected to the top of the guide rod. The center of the limiting guide ring coincides with the center of the valve stem. A movable block is mounted on the outer surface of the valve disc, and the movable block is slidably connected to the limiting guide ring. When the valve stem rises or falls, the limiting guide ring guides and limits the movement of the movable block.

[0007] In this invention, when the valve disc with guide is in operation, the medium enters from the inlet channel, passes through the valve seat, and then flows out from the outlet channel. When shut-off is required, the valve stem is driven to lower the valve disc. The valve disc is rotatable, and under the guidance of the movable block and the limiting guide ring, it maintains a vertical movement until it contacts the valve seat and is further pressed down to seal the valve seat tightly. During this process, the limiting guide ring prevents the fluid from obliquely impacting the valve disc, ensuring reliable sealing performance. When the valve needs to be opened, the fluid pressure in the inlet channel is high, which can easily cause oblique impacts on the valve disc and valve stem, preventing the valve disc from being centered on the valve seat during sealing, resulting in reduced sealing performance. The limiting guide ring reduces the oblique impact force of the high-pressure fluid on the valve disc, protecting it and ensuring stable sealing performance of the valve disc with guide.

[0008] Furthermore, a rotating wheel is installed at the upper end of the valve stem, which drives the valve stem to rotate. By rotating the valve stem with the rotating wheel, the valve stem causes the valve disc to descend or rise, sealing or releasing the valve seat.

[0009] Furthermore, a lower guide sleeve is installed on the lower surface of the valve seat, a connecting strip is sleeved on the lower guide sleeve, a rotating pin is rotatably installed in the middle of the connecting strip, a blade is installed in the middle of the outer surface of the rotating pin, and the rotation center of the rotating pin coincides with the center of the valve stem.

[0010] When the valve seat is open, the fluid entering from the inlet channel tends to flow towards the valve seat. The driving blade rotates, which in turn causes the rotating pin to rise, pushing the valve disc out of the valve seat. This, along with the upward movement of the valve disc by the auxiliary valve stem, helps to open the valve seat. Furthermore, the rotating pin causes the fluid to swirl around it, following the rotation direction of the valve disc, thus reducing the forward scouring of the valve disc, protecting it, and extending the valve's service life.

[0011] Furthermore, limit blocks are installed at the top end of the guide rod and the bottom end of the lower guide sleeve.

[0012] Furthermore, the blade array is provided with through holes penetrating its upper and lower surfaces.

[0013] Furthermore, a filter plate is installed at the bottom end of the lower guide sleeve.

[0014] Furthermore, an upper guide sleeve is installed on the upper surface of the valve seat port, the guide rod is sleeved inside the upper guide sleeve, and the upper guide sleeve is connected to the lower guide sleeve.

[0015] Furthermore, a valve stem nut is provided on the top of the valve cover, and the valve stem nut is threadedly connected to the valve stem.

[0016] Furthermore, a sealing assembly is provided between the inner wall of the valve cover and the valve stem; the sealing assembly includes a packing gasket, a sealing packing and a pressure sleeve arranged sequentially from bottom to top, and the top of the pressure sleeve is pressed and fixed by a tightening sleeving threadedly connected to the valve cover.

[0017] Compared with the prior art, the utility model adopting the above technical solution has the following advantages:

[0018] This utility model provides a gate valve with a guided valve disc. Through the cooperation of the limiting guide ring and the movable block, the lifting and lowering movement of the valve disc is guided, which can reduce the oblique impact of high pressure fluid on the valve disc and prevent the valve disc from tilting when sealing the valve seat. This makes the sealing performance of the gate valve with a guided valve disc stable and optimizes the unstable operation of traditional valves. Attached Figure Description

[0019] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0020] Figure 1 This is a schematic diagram of the structure of a stop valve with a guide valve according to the present invention;

[0021] Figure 2 This is a side view of a stop valve with a guide valve leaflet according to the present invention.

[0022] Figure 3 This is a cross-sectional view of a valve with a guide valve leaflet according to the present invention.

[0023] Figure 4 This is a cross-sectional view of another type of valve of the present invention: a stop valve with a guide valve.

[0024] Figure 5 This is a front view schematic diagram of the connecting strip, rotating ejector pin, and blade in this utility model;

[0025] Figure 6 This is a schematic diagram of the connecting strip, rotating pin, and blade in this utility model;

[0026] Figure 7 This is a schematic diagram of the limiting guide ring and guide rod in this utility model;

[0027] Figure 8 This is a schematic diagram of the structure of the limiting guide ring, guide rod, rotating pin and filter plate in this utility model;

[0028] The symbols for the main components are explained below:

[0029] 101. Fluid inlet; 102. Valve body; 103. Valve cover; 104. Valve stem; 105. Rotor; 106. Outlet flange; 107. Valve seat; 108. Fluid outlet; 109. Valve seat port; 110. Valve disc; 111. Connecting bolt; 112. Valve stem nut; 113. Compression sleeve; 114. Compression sleeve; 115. Sealing packing; 116. Limiting guide ring; 117. Guide rod; 118. Moving block; 119. Lower guide sleeve; 120. Connecting strip; 121. Filter plate; 122. Rotary pin; 123. Blade. Detailed Implementation

[0030] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that similar or identical parts are referred to by the same reference numerals in the drawings or description. Implementations not shown or described in the drawings are forms known to those skilled in the art. Furthermore, directional terms mentioned in the embodiments, such as "up," "down," "top," "bottom," "left," "right," "front," and "back," are only for reference to the directions in the drawings and are not intended to limit the scope of protection of the present invention.

[0031] like Figures 1 to 8As shown, an embodiment of the present invention provides a valve disc guided shut-off valve, comprising a valve body 102, a valve cover 103, and a valve stem 104. The valve body 102 includes a valve seat 107 with a valve seat port 109. Inlet and outlet channels are provided at the left and right ends of the valve seat port 109. An inlet flange is provided at the end of the inlet channel, forming a fluid inlet 101. An outlet flange 106 is provided at the end of the outlet channel, forming a fluid outlet 108. The shut-off valve can be connected to a fluid pipeline requiring shut-off control via the inlet flange and outlet flange 106. An opening is provided at the top of the valve body 102. A rotating wheel 105 is mounted on the upper end of the valve stem 104. The lower end of the valve stem 104 extends into the valve body 102 through the opening and is connected to a valve disc 110. Rotating the valve stem 104 via the rotating wheel 105 causes the valve disc 110 to descend or rise. The valve cover 103 is sealed at the opening and fixed by connecting bolts 111 to seal the valve stem 104. A sealing assembly is provided between the inner wall of the valve cover 103 and the valve stem 104. The sealing assembly includes, from bottom to top, a packing gasket, a sealing packing 115, and a pressure sleeve 114. The top of the pressure sleeve 114 is pressed and fixed by a tightening sleeving 113 inside the valve cover 103 through a thread. The sealing packing 115 can seal the valve stem 104 and allow the valve stem 104 to rotate. A valve seat port 109 is provided inside the valve body 102, which connects the inlet flow channel and the outlet flow channel at both ends of the valve body 102. A guide rod 117 is installed on the upper surface of the valve seat port 109, and a limit guide ring 116 is connected to the top of the guide rod 117. The center of the limit guide ring 116 coincides with the center of the valve stem 104. Three movable blocks 118 arranged in a circular array are installed on the top outer surface of the valve disc 110. The movable blocks 118 are slidably connected to the limit guide ring 116. When the valve stem 104 rises and falls, the limit guide ring 116 limits and guides the movable blocks 118. When the shut-off valve is in operation, the medium enters from the inlet channel, passes through the valve seat port 109, and then flows out from the outlet channel. When shut-off is required, the valve stem 104 is driven by the rotary wheel 105 to lower the valve disc 110. Under the guidance of the movable block 118 and the limiting guide ring 116, the valve disc 110 maintains its vertical movement until it contacts the valve seat port 109 and is further pressed down to seal the valve seat port 109 tightly. During this process, the limiting guide ring 116 can prevent the fluid from obliquely impacting the valve disc 110, ensuring reliable sealing performance and high practicality.

[0032] In addition, the valve disc 110, which is equipped with a limit guide ring 116 and a movable block 118, is subject to high fluid pressure in the inlet flow channel when the shut-off valve needs to be opened. This pressure can easily cause oblique impacts on the valve disc 110 and valve stem 104, making it impossible for the valve disc 110 to be centered on the valve seat port 109 during sealing, resulting in reduced sealing performance. The limit guide ring 116 can reduce the oblique impact force of the high-pressure fluid on the valve disc 110, protect the valve disc 110, and thus ensure the stable sealing performance of the shut-off valve.

[0033] For example, the bottom of the guide rod 117 can be fixedly installed on the upper surface of the valve seat port 109, and the top section of the guide rod 117 is slidably connected to the limiting guide ring 116, which can rise and fall under the guidance of the guide rod 117.

[0034] For example, an upper guide sleeve is installed on the upper surface of the valve seat port 109, and the guide rod 117 is sleeved in the upper guide sleeve, that is, the bottom of the guide rod 117 is installed on the upper surface of the valve seat port 109 through the upper guide sleeve; the guide rod 117 can extend and retract in the upper guide sleeve; the top section of the guide rod 117 is fixedly connected to the limiting guide ring 116.

[0035] When the limiting guide ring 116 is slidably connected to the guide rod 117, a limiting block can be installed at the top of the guide rod 117 to constrain the movement of the limiting guide ring 116, which is highly practical.

[0036] In this embodiment, a valve stem nut 112 is provided on the top of the valve cover 103. The valve stem nut 112 is threadedly connected to the valve stem 104. When the valve stem 104 is rotated, the valve stem 104 can be driven to rise and fall by the action of the valve stem nut 112, thereby driving the valve disc 110 to rise and fall.

[0037] In fact, in addition to installing the valve stem nut 112 on the top of the valve cover 103, a thread can also be provided on the top of the valve cover 103, and the thread can be used to replace the valve stem nut 112 to engage with the valve stem 104.

[0038] In this embodiment, a lower guide sleeve 119 is installed on the lower surface of the valve seat port 109, and a connecting strip 120 is sleeved on the lower guide sleeve 119. A rotating pin 122 is rotatably installed in the middle of the connecting strip 120, and a blade 123 is installed in the middle of the outer surface of the rotating pin 122. The rotation center of the rotating pin 122 coincides with the center of the valve stem 104. The blade 123 can be configured as a turbine-shaped structure, which can drive the rotating pin 122 to rise under the drive of the fluid. After the pressure difference of the fluid above and below the valve seat port 109 decreases, it falls back to its original position under the action of gravity, which is highly practical.

[0039] The working process of the rotating pin 122 is as follows: When the valve seat port 109 is open, the fluid entering from the inlet channel has a potential energy to flow towards the valve seat port 109, which drives the vane 123 to rotate. The rotation of the vane 123 will drive the rotating pin 122 to rise, pushing the valve disc 110 of the valve seat port 109 out. The upward movement of the valve disc 110 by the auxiliary valve stem 104 helps to open the valve seat port 109. In addition, the rotating pin 122 can make the fluid form a swirling flow in its vicinity, in the direction of rotation of the valve disc 110, thereby reducing the positive scouring of the valve disc 110, protecting the valve disc 110, and extending the service life of the shut-off valve.

[0040] Among them, such as Figure 6 As shown, the connecting bar 120 can adopt a crisscrossing double parallel arrangement with rings at both ends in a strip-shaped scissor structure. The rings slide with the lower guide sleeve 119. The middle of the strip-shaped scissor structure is provided with a mounting hole, in which a bearing is installed. The bearing is sleeved with the lower section of the rotating ejector pin 122.

[0041] For example, a limiting block is installed at the bottom end of the lower guide sleeve 119; the limiting block restricts the movement stroke of the connecting strip 120 to prevent the connecting strip 120 from coming off the lower guide sleeve 119.

[0042] For example, the sliding connection between the movable block 118 and the limiting guide ring 116 can be achieved by snap-fit ​​or by magnetic attraction, thus ensuring the limiting and guiding function.

[0043] In this embodiment, in order to reduce the obstruction of the fluid by the blades 123, through holes penetrating the upper and lower surfaces of the blade array can be provided.

[0044] In fact, the through hole can be set at an angle, so that when the fluid passes through the through hole, a component force relative to the vertical direction can be generated, which will drive the blade to rotate and rise.

[0045] In this embodiment, a filter plate 121 is directly installed at the bottom end of the lower guide sleeve 119. The filter plate 121 is made of rubber and has a certain elastic deformation, which can reduce or eliminate the water hammer phenomenon generated by the fluid and reduce the scouring of the valve disc 110 by the fluid.

[0046] In practice, during installation, this embodiment can also install a filter plate 121 at the bottom of the lower guide sleeve 119 via a lower guide rod as needed.

[0047] In this embodiment, the upper guide sleeve and the lower guide sleeve 119 are connected. In this way, the negative pressure can be used to drive the rotating ejector pin 122 to descend synchronously when the limiting guide ring 116 descends; and drive the rotating ejector pin 122 to rise when the limiting guide ring 116 rises.

[0048] In fact, mounting through holes can be opened on the four corner walls of the valve seat port 109, and the upper guide sleeve, mounting through holes and lower guide sleeve 119 are integrated.

[0049] In this embodiment, as Figure 3 , Figure 4 As shown, in order to ensure the sealing performance of the valve stem 104, a hollow threaded section can be provided at the top of the valve cover 103. The valve stem 104 passes through the middle of the threaded section. From bottom to top, a packing gasket, a sealing packing 115, and a pressure sleeve 114 are arranged between the threaded section and the valve stem 104. The top of the pressure sleeve 114 is tightened and fixed by a tightening sleeving 113 on the threaded section through a threaded connection. The pressure on the pressure sleeve 114 can be adjusted by tightening the tightening sleeving 113, thereby adjusting the density of the sealing packing 115 and ensuring its sealing performance.

[0050] This embodiment provides a gate valve with a guided valve disc. Through the setting of the limiting guide ring 116 and the movable block 118, during the process of the valve disc 110 being driven to rise and fall by the valve stem 104, the valve disc 110 can be limited and guided without affecting the rotation of the valve disc 110. This avoids the impact of high-pressure fluid on the valve disc 110, which could cause the valve disc 110 to deviate when sealing, thus ensuring the stable sealing performance of the gate valve with the guided valve disc 110.

[0051] The above provides a detailed description of a valve disc with a guide, stop valve provided by this utility model. The specific embodiments are described only to aid in understanding the method and core concept of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A valve disc with guide, comprising a valve body, a valve cover, and a valve stem, wherein the top of the valve body has an opening, and the lower end of the valve stem extends into the valve body through the opening and is connected to a valve disc; the valve cover is sealed at the opening to seal the valve stem; a valve seat is provided within the valve body, the valve seat communicating with an inlet flow channel and an outlet flow channel at both ends of the valve body; characterized in that, A guide rod is installed on the upper surface of the valve seat, and a limiting guide ring is connected to the top of the guide rod. The center of the limiting guide ring coincides with the center of the valve stem. A movable block is installed on the outer surface of the valve disc, and the movable block is slidably connected to the limiting guide ring. When the valve stem rises and falls, the limiting guide ring limits and guides the movable block.

2. The valve disc with guide according to claim 1, characterized in that, A lower guide sleeve is installed on the lower surface of the valve seat, and a connecting strip is sleeved on the lower guide sleeve. A rotating pin is rotatably installed in the middle of the connecting strip, and a blade is installed in the middle of the outer surface of the rotating pin. The rotation center of the rotating pin coincides with the center of the valve stem.

3. The valve disc with guide according to claim 2, characterized in that, Limiting blocks are installed at the top of the guide rod and the bottom of the lower guide sleeve.

4. The valve disc with guide according to claim 2, characterized in that, The blade array is provided with through holes that penetrate its upper and lower surfaces.

5. The valve disc with guide according to claim 2, characterized in that, A filter plate is installed at the bottom end of the lower guide sleeve.

6. The valve disc with guide according to claim 2, wherein an upper guide sleeve is installed on the upper surface of the valve seat, the guide rod is sleeved in the upper guide sleeve, and the upper guide sleeve is connected to the lower guide sleeve.

7. The valve disc with guide according to claim 1, characterized in that, A valve stem nut is provided on the top of the valve cover, and the valve stem nut is threadedly connected to the valve stem.

8. The valve disc with guide according to claim 1, characterized in that, A sealing assembly is provided between the inner wall of the valve cover and the valve stem; the sealing assembly includes a packing gasket, a sealing packing and a pressure sleeve arranged sequentially from bottom to top, and the top of the pressure sleeve is tightened and fixed by a tightening sleeving threaded into the valve cover.

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