Stop valve with pressure relief function

Abstract

The stop valve with the pressure relief function comprises a valve body, a valve deck and a valve rod, a liquid inlet end and a liquid outlet end are oppositely arranged on the two sides of the valve body, an adjustable rod is movably connected to the lower end of the valve rod in an inserted mode, and a second flange plate and a first flange plate are correspondingly arranged at the opposite ends of the adjustable rod and the valve rod respectively. Guide rods are annularly arranged on the second flange plate, scale rods are arranged between the adjacent guide rods, the guide rods and the scale rods penetrate through the first flange plate, the upper ends of the guide rods are in threaded connection with limiting nuts, reset springs are arranged above adjustable rods, a valve plate is arranged at the lower ends of the adjustable rods, and a base plate is connected to the lower portion of the valve plate through bolts. According to the scheme, under the condition that the valve body of the straight-through type stop valve is closed, the phenomenon that a pipeline or a device on the front portion of the straight-through type stop valve body is damaged due to overpressure caused by rising of the medium pressure of the inlet can be avoided, replacement of the elastic reset piece is better facilitated, and the pressure relief effect of the stop valve is further guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, specifically a gate valve with pressure relief function. Background Technology

[0002] Gate valves, as valves that completely connect or disconnect pipelines, are widely used in industries such as petroleum and chemical engineering to control the flow of media in pipelines. They are also used in gas pipelines to control the on / off flow of gas. Gate valves can also be used on some gas storage containers to improve the purity of the gas inside, especially in gas supply lines for cylinders storing flammable and explosive gases. A straight-through gate valve is one type of gate valve.

[0003] Existing straight-through gate valves generally lack pressure relief functionality. When a straight-through gate valve is closed, the inlet medium pressure rises, easily causing overpressure in the upstream pipeline or device, and even damage. To address this, we propose a gate valve with pressure relief functionality. Utility Model Content

[0004] The purpose of this utility model is to provide a stop valve with a pressure relief function to solve the problem mentioned in the background art of the prior art where the inlet medium pressure rises when the stop valve is closed, which can easily cause overpressure or even damage to the pipeline or device in front of the stop valve.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a stop valve with pressure relief function, comprising a valve body, a valve cover, and a valve stem. The valve body has an inlet end and an outlet end facing each other on both sides. The valve stem is fixedly installed to the valve cover by threads. An adjustable rod is movably inserted into the lower end of the valve stem. A flange second and a flange first are respectively provided at the opposite ends of the adjustable rod and the valve stem. A guide rod is arranged in a ring on flange second, and a scale rod is provided between adjacent guide rods. Both the guide rod and the scale rod pass through flange first. A limit nut is threaded to the upper end of the guide rod, and the limit nut is located above flange first. A return spring is provided above the adjustable rod, and the return spring is located inside the valve stem. A valve plate is provided at the lower end of the adjustable rod, and a pad is bolted to the bottom of the valve plate.

[0006] Preferably, the flange has an annular groove for inserting the guide rod and the scale rod, and the guide rod and the scale rod have the same outer diameter.

[0007] Preferably, the valve stem and the adjustable rod are collinear, and the adjustable rod is inserted into the valve body.

[0008] Preferably, the guide rod and the scale rod are both arranged in a ring outside the valve stem and the adjustable rod, and the center line of the guide rod and the scale rod are parallel to each other.

[0009] Preferably, the adjustable rod, the scale rod, and the limiting nut are all located above the valve cover.

[0010] Preferably, the lower end of the valve stem has a insertion hole for inserting the adjustable rod, and the depth of the insertion hole is greater than the effective length of the return spring.

[0011] Preferably, both the valve plate and the gasket are located inside the valve body, and the valve plate is movably fitted to the upper and lower sides of the valve body cavity.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This type of gate valve with pressure relief function has an adjustable rod installed below the valve stem, and a return spring installed between the adjustable rod and the valve stem. When the straight-through gate valve body is fully closed, when the pressure of the fluid at the inlet end increases to a certain level, the valve plate and the pad push the adjustable rod from bottom to top and insert it into the valve stem. At this time, the return spring is compressed, connecting the inlet and outlet ends of the straight-through gate valve body, thereby relieving the pressure of the fluid at the inlet end. When the pressure decreases, the elasticity of the return spring can push the adjustable rod from top to bottom. The movement of the adjustable rod causes the valve plate and the pad to block the outlet end of the inlet end, isolating the inlet and outlet ends of the straight-through gate valve body. This prevents the inlet medium pressure from rising when the valve body is closed, which could cause overpressure damage to the pipeline or device in front of the straight-through gate valve body, further ensuring the service life of the gate valve.

[0014] 2. This type of gate valve with pressure relief function has an elastic reset element (reset spring) for pressure relief located on the outside of the valve body, and the valve stem and adjustable rod are detachable, which facilitates the replacement of the reset spring and thus ensures the pressure relief effect of the gate valve. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of a half-section of the present invention;

[0017] Figure 3 For the present utility model Figure 1 Enlarged schematic diagram at point M;

[0018] Figure 4 This is a partial structural diagram of the valve stem and adjustable rod of this utility model;

[0019] Figure 5This is a schematic diagram of the connection between the valve plate and the gasket of this utility model.

[0020] In the diagram: 1. Valve body; 2. Inlet end; 3. Outlet end; 4. Valve stem; 5. Adjustable rod; 51. Valve plate; 52. Gasket; 53. Guide rod; 54. Limit nut; 55. Groove; 56. Insertion hole; 57. Scale rod; 6. Flange 1; 7. Flange 2; 8. Return spring; 9. Valve cover. Detailed Implementation

[0021] 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.

[0022] Example: Please refer to Figure 1-5 This utility model provides a technical solution: a stop valve with pressure relief function, including a valve body 1, a valve cover 9, and a valve stem 4. The valve body 1 has an inlet end 2 and an outlet end 3 facing each other on both sides, wherein the inlet end 2 and the outlet end 3 facilitate the entry and exit of liquid into the valve body 1. The valve stem 4 is fixedly installed to the valve cover 9 by threads.

[0023] Please see Figure 2 and Figure 3 An adjustable rod 5 is movably inserted into the lower end of the valve stem 4. The valve stem 4 and the adjustable rod 5 are collinear, and the adjustable rod 5 is inserted inside the valve body 1. Flanges 7 and 6 are respectively provided at opposite ends of the adjustable rod 5 and the valve stem 4. The arrangement of flanges 7 and 6 facilitates the connection and fixation of the shut-off valve to the pipeline. A guide rod 53 is arranged in a ring on flange 7, and flange 7 and guide rod 53 are fixedly installed. A scale rod 57 is provided between adjacent guide rods 53. Both guide rods 53 and scale rod 57 are arranged in a ring outside the valve stem 4 and the adjustable rod 5, and the center lines of guide rods 53 and scale rod 57 are parallel to each other. The scale rod 57 facilitates observation of the distance between flanges 6 and 7.

[0024] The adjustable rod 5, the scale rod 57, and the limiting nut 54 are all located above the valve cover 9. The guide rod 53 and the scale rod 57 both pass through the flange 6. The flange 6 has annular slots 55 for the guide rod 53 and the scale rod 57 to be inserted. The guide rod 53 and the scale rod 57 have the same outer diameter.

[0025] Furthermore, a limiting nut 54 is threadedly connected to the upper end of the guide rod 53. The limiting nut 54 is located above the flange 6. During use, the limiting nut 54 can prevent the adjustable rod 5 from detaching from the valve stem 4, thereby ensuring the relative movement of the adjustable rod 5 on the valve stem 4.

[0026] Please see Figure 1 and Figure 4 The adjustable rod 5 is equipped with a return spring 8 located above it and inside the valve stem 4. The lower end of the valve stem 4 has an insertion hole 56 for the adjustable rod 5, the depth of which is greater than the effective length of the return spring 8. Through the action of the return spring 8, when the pressure of the fluid at the inlet 2 increases to a certain level, the valve plate 51 and the pad 52 push the adjustable rod 5 upwards and insert it into the valve stem 4. At this time, the return spring 8 is compressed, connecting the inlet 2 and outlet 3 of the straight-through shut-off valve body, thereby relieving the pressure of the fluid at the inlet 2. After the pressure decreases, the elasticity of the return spring 8 allows the valve plate 51 and the pad 52 to return to their original positions.

[0027] Please see Figure 1 He Tie Figure 5 The adjustable rod 5 has a valve plate 51 at its lower end, and a pad 52 is bolted to the bottom of the valve plate 51. Both the valve plate 51 and the pad 52 are located inside the valve body 1, and the valve plate 51 is movably fitted against the upper and lower sides of the inner cavity of the valve body 1. The pad 52 is made of flexible rubber, which further reduces the contact friction between the valve plate 51 and the valve body 1.

[0028] Working principle: When the body of this type of stop valve with pressure relief function is completely closed, when the pressure of the fluid at the inlet end 2 increases to a certain level, the valve plate 51 and the pad 52 push the adjustable rod 5 from bottom to top and insert it into the valve stem 4. At this time, the return spring 8 is compressed, connecting the inlet end 2 and the outlet end 3 of the body of the stop valve, thereby relieving the pressure of the fluid at the inlet end 2. When the pressure decreases, the elastic action of the return spring 8 can push the adjustable rod 5 from top to bottom. Through the movement of the adjustable rod 5, the valve plate 51 and the pad 52 block the outlet of the inlet end 2, isolating the inlet end and outlet end of the body of the stop valve. This prevents the inlet medium pressure from rising when the valve body 1 of the stop valve is closed, which could cause overpressure damage to the pipeline or device in front of the body of the stop valve.

[0029] 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 shut-off valve with pressure relief function, comprising a valve body (1), a valve cover (9), and a valve stem (4), wherein the valve body (1) has an inlet end (2) and an outlet end (3) facing each other on both sides, and the valve stem (4) is fixedly installed to the valve cover (9) by threads, characterized in that: An adjustable rod (5) is movably inserted into the lower end of the valve stem (4). Flange 2 (7) and flange 1 (6) are respectively provided at opposite ends of the adjustable rod (5) and the valve stem (4). A guide rod (53) is arranged in a ring on flange 2 (7). A scale rod (57) is provided between adjacent guide rods (53). Both the guide rod (53) and the scale rod (57) pass through flange 1 (6). A limit nut (54) is threaded to the upper end of the guide rod (53). The limit nut (54) is located above flange 1 (6). A return spring (8) is provided above the adjustable rod (5). The return spring (8) is located inside the valve stem (4). A valve plate (51) is provided at the lower end of the adjustable rod (5). A pad (52) is bolted to the bottom of the valve plate (51).

2. A shut-off valve with pressure relief function according to claim 1, characterized in that: The flange (6) has a ring-shaped slot (55) for inserting the guide rod (53) and the scale rod (57), the outer diameters of the guide rod (53) and the scale rod (57) being equal.

3. A shut-off valve with pressure relief function according to claim 1, characterized in that: The valve stem (4) and the adjustable rod (5) are collinear, and the adjustable rod (5) is inserted into the valve body (1).

4. A shut-off valve with pressure relief function according to claim 1, characterized in that: The guide rod (53) and the scale rod (57) are both arranged in a ring outside the valve stem (4) and the adjustable rod (5), and the guide rod (53) and the scale rod (57) are parallel to the center line of the adjustable rod (5).

5. A shut-off valve with pressure relief function according to claim 1, characterized in that: The adjustable rod (5), the scale rod (57), and the limiting nut (54) are all located above the valve cover (9).

6. A shut-off valve with pressure relief function according to claim 1, characterized in that: The lower end of the valve stem (4) is provided with a plug hole (56) for the adjustable rod (5) to be inserted, and the depth of the plug hole (56) is greater than the effective length of the return spring (8).

7. A shut-off valve with pressure relief function according to claim 1, characterized in that: The valve plate (51) and the pad (52) are both located inside the valve body (1), and the valve plate (51) is movably fitted to the upper and lower sides of the inner cavity of the valve body (1).

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