CN211288770U - Float ball type stop valve - Google Patents

Abstract

The utility model provides a floating ball type globe valve, which belongs to the field of valves, and comprises a valve body, a valve seat, a valve shaft, a floating ball and a valve cover. The valve cover is fixed on the upper end of the valve body and the two are sealed. The valve seat and the valve body are integrally formed, the floating ball is arranged at the inlet end of the valve body and at the lower end of the valve seat, a spacer is fixed on the inner wall of the valve body close to the inlet end, and the The lower end of the floating ball is provided with a guide column, the guide column is arranged perpendicular to the positioning frame and is slidably connected up and down relative to the positioning frame. At the upper limit position of the floating ball, the guide column is located in the positioning frame, so The valve shaft is disposed above the floating ball after passing downward through the valve cover, and the outer surface of the floating ball is covered with a deformation layer. The utility model utilizes the water pressure to push the floating ball into close contact with the valve seat to achieve the function of sealing.

Description

Float Globe Valve

technical field

The utility model belongs to the field of valves and relates to a floating ball type cut-off valve.

Background technique

The globe valve, also known as the gate valve, is a forced-sealing valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force the sealing surface to not leak. When the medium enters the valve from below the valve disc, the operating force needs to overcome the resistance. , is the friction force between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the diameter of the valve stem should be larger, otherwise the valve stem top bending failure will occur.

The closing principle of the traditional globe valve is to rely on the pressure of the valve stem to make the sealing surface of the valve disc and the sealing surface of the valve seat closely fit to prevent the flow of the medium. This leads to the problem that the sealing surface of the disc and the sealing surface of the valve seat are not tightly fitted under the condition of high pressure.

Utility model content

The problem to be solved by the utility model is to provide a floating ball type globe valve, which utilizes water pressure to push the floating ball into close contact with the valve seat to achieve the sealing effect. the better.

In order to solve the above technical problems, the technical scheme adopted by the present invention is: a floating ball globe valve, including a valve body, a valve seat, a valve shaft, a floating ball and a valve cover, and the valve cover is fixed on the upper end of the valve body The valve seat and the valve body are integrally formed, the floating ball is arranged at the inlet end of the valve body and is arranged at the lower end of the valve seat, and the valve body is fixed on the inner wall near the inlet end. There is a positioning frame, and the lower end of the floating ball is provided with a guide column, the guide column is arranged perpendicular to the positioning frame and is slidably connected up and down relative to the positioning frame. At the upper limit position of the floating ball, the guide column is located at the In the positioning frame, the valve shaft passes downward through the valve cover and is disposed above the floating ball, and the outer surface of the floating ball is covered with a deformation layer.

Further, the lower end of the valve shaft is arc-shaped and the arc is the same as the diameter of the floating ball, and a rubber pad is provided between the lower end of the valve shaft and the floating ball.

Further, a copper sleeve is arranged between the guide column and the positioning frame, and the copper sleeve is embedded in the positioning frame.

Further, the deformation layer is made of rubber, polytetrafluoroethylene or silica gel, and the thickness of the deformation layer is 1.5-5 mm.

Further, the valve shaft is provided with a limiting protrusion in the middle and lower part, and the valve shaft is located at the upper end of the limiting protrusion and passes upward through the valve cover and is connected to the handwheel.

Further, a sealing ring is arranged between the valve cover and the valve body, the upper end of the valve cover is provided with a packing for sealing, and the upper end of the packing is provided with a gland for its positioning, and the gland is Fixed connection with the valve cover.

Further, the upper end of the valve cover is provided with a fixed seat integrally formed therewith, and the valve shaft is threadedly connected with the fixed seat.

Further, the matching position of the valve seat and the floating ball is rounded and the roughness is 0.8.

Compared with the prior art, the advantages and positive effects of the present invention are as follows.

1. The utility model realizes sealing through the cooperation between the two parts of the floating ball and the valve seat. The structure is simple, and the maintenance only needs to replace the floating ball, which saves costs, and realizes self-sealing by the pressure of the medium. The tighter the contact between the float ball and the valve seat, the better the sealing performance;

2. There is a rubber pad between the lower end of the valve shaft and the floating ball, so that when the valve stem applies pressure to the floating ball, the floating ball is evenly stressed, which effectively protects the floating ball from being deformed and improves the stability of the structure;

3. There is a copper sleeve between the guide column and the positioning frame, which can improve the wear resistance between the guide column and the positioning frame and prolong the service life of the guide column.

Description of drawings

The accompanying drawings that constitute a part of the present invention are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

Fig. 1 is the structural representation of the floating ball type globe valve of the present invention;

Fig. 2 is a detailed view of part A of Fig. 1 of the present invention.

Reference number:

1. Valve body; 2. Positioning frame; 21. Copper sleeve; 3. Floating ball; 31. Deformation layer; 32. Guide column; 4. Valve seat; 41. Fillet; 5. Valve shaft; 51. Rubber pad; 52, limit protrusion; 6, valve cover; 61, fixed seat; 7, gland; 71, packing; 8, hand wheel; 9, sealing ring.

Detailed ways

It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "horizontal", "upper", "lower", "front", "rear", "left", "right", The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility. The novel and simplified description does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second", etc., may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; may be mechanical connection or electrical connection; may be direct connection, or indirect connection through an intermediate medium, or internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

The specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 and FIG. 2 , the present utility model is a floating ball globe valve, including a valve body 1 , a valve seat 4 , a valve shaft 5 , a floating ball 3 and a valve cover 6 , and the valve cover 6 is fixed on the valve body 1 . The upper end and the two are sealed, the valve seat 4 and the valve body 1 are integrally formed, the floating ball 3 is arranged at the inlet end of the valve body 1 and is arranged at the lower end of the valve seat 4, and a spacer is fixed on the inner wall of the valve body 1 near the inlet end. 2. The lower end of the float ball 3 is provided with a guide post 32. The guide post 32 is arranged perpendicular to the positioning frame 2 and is slidably connected up and down relative to the positioning frame 2. At the upper limit position of the float ball 3, the guide post 32 is located in the positioning frame 2, and the valve The shaft 5 passes downward through the valve cover 6 and is arranged above the float ball 3. The outer surface of the float ball 3 is covered with a deformation layer 31. Move up and down along the hole of the positioning frame 2 to improve the accuracy of the up and down movement of the floating ball 3.

Preferably, the lower end of the valve shaft 5 is arc-shaped and the radian is the same as the diameter of the float ball 3 , and a rubber pad 51 is provided between the lower end of the valve shaft 5 and the float ball 3 , so that when the valve stem applies pressure to the float ball 3 , the float The force of the ball 3 is uniform, which effectively protects the floating ball 3 from being deformed and improves the stability of the structure.

Preferably, a copper sleeve 21 is provided between the guide post 32 and the positioning frame 2 , the copper sleeve 21 is embedded in the positioning frame 2 , and the thickness of the copper sleeve 21 is set to improve the wear resistance between the guide post 32 and the positioning frame 2 , prolonging the service life of the guide column 32 .

Preferably, the deformation layer 31 is made of rubber, polytetrafluoroethylene or silica gel, and the thickness of the deformation layer 31 is 1.5-5 mm, preferably a rubber material, with a thickness of 2 mm. If the thickness is too large, it is inconvenient to manufacture, and the floating performance is reduced. The specific thickness can be adjusted appropriately according to the specification and the size of the medium flow, so as to ensure a certain pre-compression deformation and ensure the sealing performance.

Preferably, the valve shaft 5 is provided with a limit protrusion 52 in the middle and lower part. The valve shaft 5 is located at the upper end of the limit protrusion 52 and passes upward through the valve cover 6 and is connected to the handwheel 8. After the limit protrusion 52 is provided, it can be The valve shaft 5 is prevented from falling off directly from the valve body 1 during the upward rotation of the valve shaft 5, thereby improving the convenience and safety of the structural operation.

Preferably, a sealing ring 9 is arranged between the valve cover 6 and the valve body 1 , a packing 71 for sealing is arranged on the upper end of the valve cover 6 , and a gland 7 for positioning is arranged on the upper end of the packing 71 . The cover 6 is fixedly connected, and the sealing between the valve shaft 5 and the valve body 1 can be improved after the packing 71 and the gland 7 are provided.

Preferably, the upper end of the valve cover 6 is provided with a fixed seat 61 integrally formed with it, which can be directly formed by casting, low cost in mass production, and easy to manufacture. operate.

Preferably, the matching position of the valve seat 4 and the floating ball 3 is the rounded corner 41 and the roughness is 0.8. The higher the machining accuracy, the higher the contact sealing performance and the higher the sealing effect. 3 causes damage, which is beneficial to improve the service life of the float 3.

In the actual working process, the valve seat 4 and the valve body 1 are made of the same material, and the valve seat 4 and the valve body 1 are integrally cast, which has a simple process and low cost. The valve seat 4 is finely processed in the later stage to ensure that the fillet 41 is ground. After the roughness reaches 0.8 or more, the floating ball 3 adopts the overall rubber coating, and the outer deformation layer 31 is covered.

When the valve is opened, the valve stem is used to apply pressure to the floating ball 3, so that the sealing surface of the floating ball 3 and the valve seat 4 is separated, and the medium in the pipeline flows; when the valve is closed, the handwheel 8 is used to drive the valve stem, so that the valve stem rises to At a certain height, the valve can rely on the pressure of the medium to achieve self-sealing, that is, under the action of the medium pressure, the floating ball 3 floats up and closely contacts the sealing surface of the valve seat 4 to achieve sealing and prevent the flow of the medium. This structure passes the floating ball 3 and the valve seat 4. The previous cooperation of the two components realizes sealing, the structure is simple, and the maintenance only needs to replace the float 3, which saves costs, and realizes self-sealing by the pressure of the medium, with good sealing performance. The higher the pressure, the tighter the contact between the float 3 and the valve seat 4. , the better the sealing performance.

An embodiment of the present invention has been described in detail above, but the content is only a preferred embodiment of the present invention, and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present utility model should still belong to the scope of the patent of the present utility model.

Claims (8)

1. Float ball formula stop valve, its characterized in that: including valve body, disk seat, valve shaft, floater and valve gap, the valve gap sets firmly the upper end and the two sealed setting of valve body, the disk seat with valve body integrated into one piece, the floater sets up at the entrance point of valve body and establishes the lower extreme of disk seat, the valve body has set firmly the locating rack on being close to the inner wall of entrance point, the lower extreme of floater is equipped with the guide post, the guide post perpendicular to the locating rack sets up and is relative sliding connection about the locating rack the last extreme position of floater, the guide post is located in the locating rack, the valve shaft passes downwards set up behind the valve gap the floater top, the surface cladding of floater has the deformation layer.

2. The float-type stop valve of claim 1, wherein: the lower end of the valve shaft is arc-shaped, the radian of the lower end of the valve shaft is the same as the diameter of the floating ball, and a rubber pad is arranged between the lower end of the valve shaft and the floating ball.

3. The float-type stop valve of claim 1, wherein: the guide post with be equipped with the copper sheathing between the locating rack, the copper sheathing inlays to be established in the locating rack.

4. The float-type stop valve of claim 1, wherein: the deformation layer is made of rubber, polytetrafluoroethylene or silica gel, and the thickness of the deformation layer is 1.5-5 mm.

5. The float-type stop valve of claim 1, wherein: the middle lower part of the valve shaft is provided with a limiting bulge, and the valve shaft is positioned at the upper end of the limiting bulge and penetrates through the valve cover upwards to be connected with the hand wheel.

6. The float-type stop valve of claim 1, wherein: the valve comprises a valve body, a valve cover, a valve rod, a valve cover and a sealing ring, wherein the valve rod is arranged between the valve cover.

7. The float-type stop valve of claim 6, wherein: the upper end of the valve cover is provided with a fixed seat which is integrally formed with the valve cover, and the valve shaft is in threaded connection with the fixed seat.

8. The float-type stop valve of claim 1, wherein: the valve seat and the position matched with the floating ball are round corners, and the roughness is 0.8.

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