Valve rod grease injection structure of flat gate valve

Abstract

The utility model discloses a flat gate valve rod grease injection structure which comprises a sealing cover, an O-shaped ring, a grease injection valve body, a connecting plate, a spring, a supporting column and a sealing ball, the sealing cover is connected to one end of the grease injection valve body through threads, the O-shaped ring is installed between the sealing cover and the grease injection valve body, a through hole is formed in the center of the grease injection valve body, and the sealing ball is arranged in the through hole. Mounting holes are formed in the ends, away from the sealing cover, of the through holes, connecting plates are fixedly connected to the outer ends of the mounting holes, springs are fixedly connected to the inner sides of the connecting plates, and supporting columns are fixedly connected to the ends, away from the connecting plates, of the springs. The sealing cover is additionally arranged outside an original grease injection valve, the sealing cover and the grease injection valve are sealed through the O-shaped ring, the sealing cover and the grease injection hole of the grease injection valve are sealed through the metal conical surface, secondary sealing can be achieved when the sealing cover is screwed down, grease leakage can be prevented when the sealing face of the ball inside the grease injection valve is damaged, and the sealing effect is good. The device is simple and reasonable in structure, good in using effect, low in manufacturing cost and high in practicability.

Description

Technical Field

[0001] The utility model relates to a flat gate valve, in particular to a grease injection structure for a valve stem of a flat gate valve. Background Art

[0002] The flat gate valve is widely used in natural gas transmission pipelines due to its short structure length and some characteristics of the ball valve. The flat gate valve stem packing adopts the design of upper and lower sealing packing and middle spacer ring, and is equipped with a grease injection valve. The main function of the grease injection valve is to inject sealing grease to achieve emergency sealing when the packing leaks. Usually, the internal structure of the grease injection valve is a one-way check valve. When grease injection is required, a grease injection gun is connected to the channel of the grease injection valve, and pressure is applied to make the grease push the internal ball away from the sealing surface, so that the grease enters the valve stem through the spacer ring to achieve emergency sealing. However, if the spherical sealing surface is damaged, the grease may leak from the grease injection valve. For this reason, we propose a flat gate valve stem grease injection structure. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a flat gate valve stem grease injection structure, which solves the problem that when the internal spherical sealing surface of the existing flat gate valve stem grease injection valve is damaged, grease may leak from the grease injection valve.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: a flat gate valve stem grease injection structure, comprising a sealing cover, an O-ring, a grease injection valve body, a connecting plate, a spring, a pillar and a sealing ball, the sealing cover being connected to one end of the grease injection valve body by a thread, an O-ring being installed between the sealing cover and the grease injection valve body, a through hole being opened in the center of the grease injection valve body, a mounting hole being provided at the end of the through hole away from the sealing cover, a connecting plate being fixedly connected to the outer end of the mounting hole, a spring being fixedly connected to the inner side of the connecting plate, a pillar being fixedly connected to the end of the spring away from the connecting plate, and a sealing ball being installed at the end of the pillar away from the spring.

[0005] Based on the above solution, the outer ring of the sealing cover is provided with a mesh knurling.

[0006] Based on the above solution, both ends of the through hole are provided with conical sealing surfaces, and the part of the sealing cover in contact with the through hole is provided with a conical surface matching the conical sealing surface.

[0007] Based on the above solution, the O-ring is made of rubber material.

[0008] Compared with the prior art, the utility model has the following beneficial effects: a flat gate valve stem grease injection structure, a sealing cover is added to the outside of the original grease injection valve, the sealing cover and the grease injection valve are sealed with an O-ring, the sealing cover and the grease injection hole of the grease injection valve are sealed with a metal cone surface, and secondary sealing can be achieved when the sealing cover is tightened, which can prevent grease leakage when the sealing surface of the sphere inside the grease injection valve is damaged. The utility model has a simple and reasonable structure, good use effect, low production cost and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a structural schematic diagram of a grease injection structure for a flat gate valve stem of the utility model;

[0010] Figure 2 This is a state diagram of a flat gate valve stem grease injection structure installed on a valve cover according to the utility model.

[0011] The numbers in the figure are: 1-sealing cover, 2-O-ring, 3-grease injection valve body, 4-conical sealing surface, 5-through hole, 6-connecting plate, 7-spring, 8-pillar, 9-sealing ball, 10-valve cover. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0013] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0014] Reference Figure 1 to Figure 2It can be seen that a flat gate valve stem grease injection structure includes a sealing cover 1, an O-ring 2, a grease injection valve body 3, a connecting plate 6, a spring 7, a pillar 8 and a sealing ball 9. The sealing cover 1 is connected to one end of the grease injection valve body 3 by a thread, and an O-ring 2 is installed between the sealing cover 1 and the grease injection valve body 3. A through hole 5 is opened in the center of the grease injection valve body 3, and a mounting hole is provided at the end of the through hole 5 away from the sealing cover 1. A connecting plate 6 is fixedly connected to the outer end of the mounting hole, and a spring 7 is fixedly connected to the inner side of the connecting plate 6. The end of the spring 7 away from the connecting plate 6 is fixedly connected to the pillar 8, and a sealing ball 9 is installed at the end of the pillar 8 away from the spring 7. The spring 7 presses the sealing ball 9 against the conical sealing surface 4 of the through hole 5 to play a sealing role.

[0015] The outer ring of the sealing cover 1 is provided with a reticulated knurling, and this design can play an anti-slip role when the sealing cover 1 is twisted; both ends of the through hole 5 are provided with a conical sealing surface 4, and the part of the sealing cover 1 that contacts the through hole 5 is provided with a conical surface that matches the conical sealing surface 4, and the conical sealing surface 4 and the sealing ball 9 and the sealing cover 1 can cooperate with each other to achieve a sealing effect; the O-ring 2 is made of rubber material, and the rubber material has a good sealing effect and is easy to install.

[0016] The principles and advantages of the utility model: a flat gate valve stem grease injection structure, when in use, the grease injection valve body 3 is connected to the valve cover 10 by threading, when grease injection is needed, the sealing cover 1 is unscrewed, and grease is injected from the through hole 5 with a special grease injection gun, and the sealing cover 1 is tightened after the grease injection is completed, the sealing ball 9 and the through hole 5 can be sealed, the sealing cover 1 and the through hole 5 can also be sealed, and the O-ring 2 and the sealing cover 1 are also sealed. The multi-layer seal can prevent grease leakage when the seal at the sealing ball 9 fails, and the sealing effect is good. The utility model has a simple and reasonable structure, a good sealing effect, a low manufacturing cost, and is suitable for popularization and use.

[0017] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A grease injection structure for a flat gate valve stem, comprising a sealing cover (1), an O-ring (2), a grease injection valve body (3), a connecting plate (6), a spring (7), a support (8) and a sealing ball (9), characterized in that: The sealing cover (1) is connected to one end of the grease injection valve body (3) by means of a thread, an O-ring (2) is installed between the sealing cover (1) and the grease injection valve body (3), a through hole (5) is provided at the center of the grease injection valve body (3), an installation hole is provided at one end of the through hole (5) away from the sealing cover (1), a connecting plate (6) is fixedly connected to the outer end of the installation hole, a spring (7) is fixedly connected to the inner side of the connecting plate (6), a pillar (8) is fixedly connected to one end of the spring (7) away from the connecting plate (6), and a sealing ball (9) is installed at one end of the pillar (8) away from the spring (7).

2. A flat gate valve stem grease injection structure according to claim 1, characterized in that: The outer ring of the sealing cover (1) is provided with a reticulated knurling.

3. A flat gate valve stem grease injection structure according to claim 1, characterized in that: Conical sealing surfaces (4) are provided at both ends of the through hole (5), and a conical surface matching the conical sealing surface (4) is provided at a portion of the sealing cover (1) that contacts the through hole (5).

4. A flat gate valve stem grease injection structure according to claim 1, characterized in that: The O-ring (2) is made of rubber material.

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