A hard-seal valve seat structure with grease injection function

Abstract

This utility model relates to a hard-seal valve seat structure with grease injection function, including a valve cover, a valve seat, and a ball. A valve seat pressure ring is installed inside the valve cover. The valve cover has a valve cover oil injection hole, and the valve seat has a valve seat oil injection hole. The valve seat pressure ring has a packing ring oil injection hole, one end of which communicates with the valve cover oil injection hole, and the other end of which communicates with the valve seat oil injection hole. The valve cover also has a grease injector insertion hole communicating with the valve cover oil injection hole. The other end of the valve seat oil injection hole communicates with the ball-seat sealing surface between the ball and the valve seat. The valve seat structure described in this application injects grease through the grease injector on the valve cover. The grease passes through the valve cover, valve seat pressure ring, and valve seat via a specially designed internal oil guide channel. Guided and blocked by the graphite seal, it is precisely delivered to the friction sealing surface between the ball and the valve seat, achieving lubrication. It can directly lubricate the sealing surfaces of the ball and the valve seat, greatly reducing the valve operating torque, making switching smoother, protecting the ball seat sealing surface, and improving the valve's service life.

Description

Technical Field

[0001] This utility model belongs to the field of ball valve technology, specifically relating to a hard-seal valve seat structure with grease injection function. Background Technology

[0002] For pipelines containing solid particles, we mostly choose hard-seal ball valves because solid particles can erode and damage soft valve seats, resulting in a short lifespan. However, hard-seal valves have a dry metal-metal friction seal between the ball and the metal valve seat, which leads to high torque, and the sealing surface is also prone to damage after long-term use.

[0003] To address the dry friction between the ball and seat, besides replacing the seat with a softer material like plastic or rubber, grease can be injected into the sealing surfaces of the ball and seat during valve operation. This reduces the switching torque and protects the sealing surfaces from dry friction damage. However, hard-seal valve seats rely on graphite packing for sealing, which requires an external pressure ring for pre-tightening. External grease injection is difficult to apply directly to the ball and seat sealing surfaces. Utility Model Content

[0004] The purpose of this utility model is to provide a hard-seal valve seat structure with grease injection function, which realizes the grease injection function of the ball seat by opening an oil injection hole.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hard-seal valve seat structure with grease injection function, including a valve cover, a valve seat, and a ball. A valve seat pressure ring is installed inside the valve cover. The valve cover has a valve cover oil injection hole, and the valve seat has a valve seat oil injection hole. The valve seat pressure ring has a packing pressure ring oil injection hole with one end communicating with the valve cover oil injection hole and the other end communicating with the valve seat oil injection hole. The valve cover also has a grease injector insertion hole communicating with the valve cover oil injection hole. The other end of the valve seat oil injection hole communicates with the ball seat sealing surface between the ball and the valve seat.

[0006] Furthermore, a graphite valve seat packing is installed inside the valve cover.

[0007] Furthermore, a first spring groove is provided on the valve seat pressure ring, and a pressure ring spring is fixedly installed in the first spring groove. One end of the pressure ring spring is fixedly installed in the first spring groove, and the other end extends out of the first spring groove and abuts against the valve cover.

[0008] Furthermore, a pressure ring sealing groove is formed on the valve cover, and a graphite pressure ring seal is provided in the pressure ring sealing groove.

[0009] Furthermore, a valve seat sealing groove is formed on the valve seat, and a graphite valve seat seal is embedded in the valve seat sealing groove.

[0010] Furthermore, a second spring groove is provided on the valve cover, one end of the valve seat spring is fixedly installed in the second spring groove, and the other end extends out of the second spring groove and abuts against the valve seat.

[0011] Furthermore, a check valve is inserted into the insertion hole of the grease injector.

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

[0013] The valve seat structure described in this application injects grease through a grease injector on the valve cover. The grease passes through the valve cover, valve seat pressure ring, and valve seat via a specially designed internal oil guide channel. With the guidance and obstruction of the graphite seal, it is ultimately precisely delivered to the friction sealing surface between the ball and the valve seat for lubrication. This allows for direct grease lubrication of the sealing surfaces of the ball core and valve seat, greatly reducing the valve operating torque, making switching smoother, protecting the ball seat sealing surface, and improving the valve's service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the valve seat structure described in this utility model;

[0015] Figure 2 This utility model Figure 1 A magnified view of a section at point A in the middle;

[0016] In the diagram: 1. Ball; 2. Valve seat; 3. Valve seat pressure ring; 4. Graphite pressure ring seal; 5. Graphite valve seat seal; 6. Pressure ring spring; 7. Graphite valve seat packing; 8. Valve seat spring; 9. Valve cover; 10. Check valve; 11. Grease injector; 12. Valve cover oil injection hole; 13. Packing pressure ring oil injection hole; 14. Valve seat oil injection hole; 15. Ball seat sealing surface; 16. Grease injector insertion hole. Detailed Implementation

[0017] 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.

[0018] refer to Figure 1-2 As shown, this utility model provides a hard-seal valve seat 2 structure with grease injection function, including a valve cover 9, a valve seat 2 installed inside the valve cover 9, and a ball 1 abutting against the side of the valve seat 2 away from the valve cover 9. The abutment between the valve seat 2 and the ball 1 forms a ball seat sealing surface 15. A sealing structure is provided between the valve cover 9 and the valve seat 2.

[0019] The sealing structure includes a valve seat pressure ring 3 installed inside the valve cover 9. The valve seat pressure ring 3 seals and protects the internal components. The pressure ring is pressed against the valve seat 2 by a pressure ring spring 6. Specifically, the valve seat pressure ring 3 has a first spring groove, and a pressure ring spring 6 is fixedly installed in the first spring groove. One end of the pressure ring spring 6 is fixedly installed in the first spring groove, and the other end extends out of the first spring groove and abuts against the valve cover 9. At the same time, in order to increase the sealing between the valve seat pressure ring 3 and the valve cover 9, a pressure ring sealing groove is formed on the valve cover 9, and a graphite pressure ring seal 4 is provided in the pressure ring sealing groove.

[0020] Furthermore, in this embodiment, a graphite valve seat seal 5 is provided between the valve seat 2 and the valve seat pressure ring 3 to seal between the valve seat 2 and the valve seat pressure ring 3. Specifically, a valve seat 2 sealing groove is formed on the valve seat 2, and a graphite valve seat seal 5 is embedded in the valve seat 2 sealing groove.

[0021] A graphite valve seat packing 7 is also provided between the valve seat 2 and the valve cover 9 to increase the sealing performance between the valve cover 9 and the valve seat 2.

[0022] Meanwhile, in order to make the contact between the valve seat 2 and the ball 1 more tight, a valve seat spring 8 is installed inside the valve cover 9. Specifically, a second spring groove is opened on the valve cover 9, one end of the valve seat spring 8 is fixedly installed in the second spring groove, and the other end extends out of the second spring groove and abuts against the valve seat 2, so that the valve seat 2 moves toward the ball 1, thereby making the contact between the valve seat 2 and the ball 1 more tight.

[0023] Meanwhile, an oil guiding channel is formed between the valve cover 9, the valve seat pressure ring 3, and the valve seat 2. Specifically, the oil guiding channel includes a valve cover oil injection hole 12 on the valve cover 9, a packing ring oil injection hole 13 on the valve seat pressure ring 3, and a valve seat oil injection hole 14 on the valve seat 2. The valve cover oil injection hole 12 and the packing ring oil injection hole 13 are connected at one end, and the valve seat oil injection hole 14 and the packing ring oil injection hole 13 are connected at the other end. The other end of the valve seat oil injection hole 14 is also connected to the ball seat sealing surface 15, thus forming a flowing oil guiding channel. In this embodiment, a grease injector insertion hole 16 is provided on the valve cover 9, and the grease injector insertion hole 16 is connected to the valve cover oil injection hole 12. The radius of the grease injector insertion hole 16 is larger than the radius of the valve cover oil injection hole 12.

[0024] Meanwhile, in order to prevent the grease injected by the grease injector 11 from flowing back, a check valve 10 is inserted into the grease injector insertion hole 16.

[0025] During installation, the graphite pressure ring seal 4 is installed into the valve cover 9; the valve seat spring 8 is installed into the valve cover 9; the pressure ring spring 6 is installed into the valve seat pressure ring 3; the valve seat pressure ring 3 is installed into the valve cover 9, ensuring that the pressure ring spring 8 abuts against the valve cover; the graphite valve seat packing 7 is installed into the valve cover 9; the graphite valve seat seal 5 is installed into the valve seat 2; the valve seat 2 is installed into the valve cover 9; the check valve 10 is installed into the grease injection hole on the valve cover 9; and the grease injection device 11 is installed into the grease injection hole.

[0026] When the valve is in use, grease is injected through the grease injector 11 and flows through the check valve 10 to the oil injection hole of the valve cover. The check valve 10 allows the grease to flow in and prevents the grease from flowing back. The grease in the oil injection hole of the valve cover will flow to the oil injection hole of the packing ring under the obstruction of the graphite valve seat packing 7 and the graphite pressure ring seal 4, and then to the oil injection hole of the valve seat under the obstruction of the graphite valve seat packing 7 and the graphite valve seat seal 5. Finally, it flows to the ball seat sealing surface between the ball 1 and the valve seat 2 to achieve a lubrication effect, thereby reducing the switching torque, making the switching smoother, enabling rapid shut-off, protecting the ball seat sealing surface, and improving the service life of the valve.

[0027] 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 hard-seal valve seat structure with grease injection function, characterized in that: The device includes a valve cover, a valve seat, and a ball. A valve seat pressure ring is installed inside the valve cover. The valve cover has a valve cover oil injection hole, and the valve seat has a valve seat oil injection hole. The valve seat pressure ring has a packing pressure ring oil injection hole with one end connected to the valve cover oil injection hole and the other end connected to the valve seat oil injection hole. The valve cover also has a grease injector insertion hole connected to the valve cover oil injection hole. The other end of the valve seat oil injection hole is connected to the ball seat sealing surface between the ball and the valve seat.

2. The hard-seal valve seat structure with grease injection function according to claim 1, characterized in that: The valve cover is fitted with graphite valve seat packing.

3. The hard-seal valve seat structure with grease injection function according to claim 1, characterized in that: The valve seat pressure ring is provided with a first spring groove, and a pressure ring spring is fixedly installed in the first spring groove. One end of the pressure ring spring is fixedly installed in the first spring groove, and the other end extends out of the first spring groove and abuts against the valve cover.

4. The hard-seal valve seat structure with grease injection function according to claim 1, characterized in that: A pressure ring sealing groove is provided on the valve cover, and a graphite pressure ring seal is provided in the pressure ring sealing groove.

5. The hard-seal valve seat structure with grease injection function according to claim 1, characterized in that: A valve seat sealing groove is formed on the valve seat, and a graphite valve seat seal is embedded in the valve seat sealing groove.

6. The hard-seal valve seat structure with grease injection function according to claim 1, characterized in that: The valve cover has a second spring groove, one end of the valve seat spring is fixedly installed in the second spring groove, and the other end extends out of the second spring groove and abuts against the valve seat.

7. The hard-seal valve seat structure with grease injection function according to claim 1, characterized in that: A check valve is inserted into the insertion hole of the grease injector.

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