A valve seat anti-detachment structure

Abstract

This utility model relates to a valve seat anti-fall-off structure, including a valve cover and a valve seat installed inside the valve cover. An O-ring and a spring are installed on the valve seat, and a valve seat stop is fixedly installed on the valve cover. To avoid the risk of the valve seat falling off, a valve seat stop is tightened onto the valve cover using an external hexagonal screw. This ensures that during valve assembly, when the valve cover and valve seat assembly are inverted, the valve seat remains stable and will not fall off when the frictional force of the O-ring is greater than the weight of the valve seat; when the frictional force of the O-ring is less than the weight of the valve seat, the valve seat will slide and fall off, and the valve seat stop will prevent the valve seat from falling off, thus preventing damage to the parts.

Description

Technical Field

[0001] This utility model belongs to the field of ball valve technology, specifically relating to a valve seat anti-detachment structure. Background Technology

[0002] In recent years, the market for soft-seal ball valves has flourished, and the application of soft-seal materials has become increasingly widespread, such as O-rings and triangular rings in long-distance natural gas pipelines. Along with this continuous development, valve diameters are also increasing, currently exceeding the 60-inch limit. With the increase in valve diameter, assembly details are becoming more apparent. For example, when assembling the valve cover onto the valve body of a large-diameter valve, the valve cover and valve seat assembly need to be inverted. If the friction of the O-ring is greater than the weight, the valve seat and valve cover assembly can be assembled smoothly. However, if the friction of the O-ring is less than the weight of the valve seat, the valve seat is prone to detachment during assembly, causing damage to parts or even safety accidents. This is especially true during impacts and vibrations, where the valve seat is more likely to detach, leading to the aforementioned accidents.

[0003] Meanwhile, during valve disassembly and maintenance, after the valve cover is lifted, the valve seat is also very likely to fall and hit the ball surface under collision or vibration conditions, causing damage to parts and safety accidents. Utility Model Content

[0004] The purpose of this utility model is to provide a valve seat anti-detachment structure, which adds a step to the valve cover and tightens a stop block on the step with screws. In this way, the valve seat can be prevented from falling off during the assembly and buckling process, thus preventing safety accidents caused by the valve seat falling off.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a valve seat anti-detachment structure, including a valve cover and a valve seat installed inside the valve cover, wherein an O-ring and a spring are installed on the valve seat, and a valve seat stop is fixedly installed on the valve cover.

[0006] Furthermore, the valve seat stop is fixedly mounted on the valve cover by multiple screws.

[0007] Furthermore, the screw is an external hexagonal screw.

[0008] Furthermore, the O-ring includes a main sealing O-ring and an oil-blocking O-ring.

[0009] Furthermore, a fireproof graphite rope is installed on the outside of the valve seat.

[0010] Furthermore, an anti-loosening washer is provided between the valve seat stop and the external hexagonal screw.

[0011] Furthermore, the valve cover is provided with a pin hole, a positioning pin is inserted into the pin hole, and an exhaust hole is provided on the positioning pin.

[0012] Compared with the prior art, this utility model has the following advantages:

[0013] (1) To avoid the risk of the valve seat falling off, a valve seat stop is tightened on the valve cover with an external hexagonal screw. This means that during the valve assembly backing process, the valve cover and valve seat assembly components need to be backed up. In this way, when the friction force of the O-ring is greater than the weight of the valve seat, the valve seat can remain stable and will not fall off. When the friction force of the O-ring is less than the weight of the valve seat, the valve seat will slide down and fall off. The valve seat stop will prevent the valve seat from falling off, thus preventing damage to parts and possible safety accidents.

[0014] (2) During the valve disassembly and maintenance process, after the valve cover is lifted, the valve seat is also very likely to fall and smash under collision or vibration conditions, causing damage to parts and safety accidents. In this application, by setting a step and fixing a valve seat block on the step, the valve seat block can also prevent the valve seat from falling, prevent damage to parts, and even cause safety accidents.

[0015] (3) During the assembly process, due to the high machining accuracy of the pin hole and the locating pin, and the lubricating oil applied to the side, the bottom of the pin hole is prone to air blockage, which may cause the locating pin to fail to be installed. Therefore, in this application, a hole is drilled in the middle of the locating pin to release the residual gas at the bottom and avoid the problem of air blockage in the pin hole. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the cross-sectional structure of the ball valve;

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of the valve seat anti-detachment structure;

[0018] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0019] In the diagram: 1. Valve cover; 2. Oil retaining O-ring; 3. Main sealing O-ring; 4. Fireproof graphite rope; 5. Spring; 6. Valve seat; 7. Anti-loosening washer; 8. Valve seat stop; 9. External hexagonal screw; 10. Locating pin; 11. Step. Detailed Implementation

[0020] 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.

[0021] refer to Figure 1-3As shown, the present invention provides a valve seat anti-detachment structure, including a valve cover 1 and a valve seat 6 installed inside the valve cover 1. An O-ring and a spring 5 are installed inside the valve seat 6. The O-ring includes a main sealing O-ring 3 and an oil-blocking O-ring 2. The main sealing O-ring 3 is directly nested on the valve seat 6. The valve seat 6 has an O-ring groove and a spring groove. The oil-blocking O-ring 2 is embedded in the O-ring groove, and one end of the spring 5 is installed in the spring groove. The main sealing O-ring 3, the oil-blocking O-ring 2, and the spring 5 all abut against the valve cover 1.

[0022] Meanwhile, in order to prevent the valve seat 6 from falling off, a valve seat stop is fixedly installed on the valve cover 1. Specifically, a step 11 is provided on the valve cover 1. The step 11 is located below the valve seat 6, and multiple screw holes are opened around the surface of the step 11. The screw holes are opened at the edge of the step 11 near the valve seat 6, and the screw holes are opened at equal angles and distances.

[0023] Meanwhile, the valve seat block has a through hole, and a screw passes through the through hole and is threaded into the screw hole, thereby fixing the valve seat 6 block on the valve cover 1. Part of the valve seat 6 block exposes the step 11, so that it can abut against the valve seat 6. The screw is an external hexagonal screw 9.

[0024] Furthermore, in order to prevent the external hexagonal screw 9 from damaging the valve seat block and from loosening, an anti-loosening washer 7 is provided between the external hexagonal screw 9 and the valve seat block.

[0025] Meanwhile, in this embodiment, a fireproof graphite rope 4 is installed on the outside of the valve seat 6. Specifically, a graphite rope groove is opened on the surface of the valve seat 6, and the fireproof graphite rope 4 is nested in the graphite rope groove and abuts against the valve cover 1. The fireproof graphite rope 4 improves the heat resistance and extends the service life.

[0026] During installation, fireproof graphite rope 4 is inserted into valve seat 6; main sealing O-ring 3 is inserted into valve seat 6; oil baffle O-ring 2 is inserted into valve seat 6; spring 5 is inserted into valve seat 6; then valve seat 6 is pressed into valve cover 1; valve seat stop 8 and anti-loosening washer 7 are fixed to valve cover 1 with external hexagon screws 9.

[0027] During the ball valve assembly process, the valve cover 1 and valve seat 6 assembly components need to be inverted. This way, when the friction force of the O-ring is greater than the weight of the valve seat 6, the valve seat 6 can remain stable and will not fall off. When the friction force of the O-ring is less than the weight of the valve seat 6, the valve seat 6 will slide down and fall off. The valve seat 6 stop block will prevent the valve seat 6 from falling off, preventing damage to parts or even safety accidents. At the same time, during valve disassembly and maintenance, after the valve cover 1 is lifted, the valve seat 6 is also very likely to fall off under collision or vibration conditions, causing damage to parts and safety accidents. The valve seat 6 stop block can also prevent the valve seat 6 from falling off.

[0028] In this embodiment, the valve cover 1 is provided with a pin hole, and a positioning pin 10 is inserted into the pin hole. The positioning pin 10 is used to connect the valve cover 1 and the support plate (not shown in the figure). The support plate is used to fix the ball (not shown in the figure).

[0029] Meanwhile, the positioning pin 10 is provided with an exhaust hole, which is connected to the pin hole, so as to effectively discharge the residual gas at the bottom of the pin hole and prevent the positioning pin 10 from being pressed and unable to be installed.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A valve seat anti-falling structure characterized by: It includes a valve cover and a valve seat installed inside the valve cover. An O-ring and a spring are installed on the valve seat, and a valve seat stop is fixedly installed on the valve cover.

2. The anti-falling structure of valve seat according to claim 1, characterized in that: The valve seat block is fixedly installed on the valve cover by multiple external hexagonal screws.

3. The anti-separation structure of a valve seat according to claim 1, characterized in that: The O-rings include a main sealing O-ring and an oil-blocking O-ring.

4. The anti-separation structure of a valve seat according to claim 1, characterized in that: Fireproof graphite rope is installed on the outside of the valve seat.

5. The valve seat anti-detachment structure according to claim 2, characterized in that: An anti-loosening washer is provided between the valve seat stop and the external hexagonal screw.

6. The anti-separation structure of a valve seat according to claim 1, characterized in that: The valve cover is provided with a pin hole, a positioning pin is inserted into the pin hole, and an exhaust hole is provided on the positioning pin.

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