Impact-resistant stop valve

Abstract

The utility model provides an impact-resistant stop valve, and belongs to the technical field of stop valves. The stop valve solves the problem that a stop valve in the prior art is poor in sealing reliability. The impact-resistant stop valve comprises a valve body and a valve element which can move up and down and is arranged in the valve body, a valve seat used for being communicated with the two ends of the valve body is arranged on the inner wall of the valve body, the valve element and the valve seat are oppositely arranged up and down, a containing groove is formed in the lower end of the valve element, a sealing gasket is arranged in the containing groove, and a positioning plate is arranged in the positioning groove. The positioning plate and the sealing gasket are fixedly connected with the valve element through fasteners, and the sealing gasket can abut against the valve seat so as to separate the two sides of the valve seat. The stop valve has the advantage that the sealing reliability of the stop valve can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of stop valves and relates to an impact-resistant stop valve. Background Art

[0002] A globe valve is a common pipeline valve that can quickly disconnect or connect fluids in a pipeline system and is widely used in various industrial and civil pipeline systems. A globe valve typically comprises a valve body and a valve core that is movable up and down within the body. The inner wall of the body is provided with a valve seat for connecting the two ends of the body. The valve core and the valve seat are positioned vertically opposite each other, and a rubber sealing gasket is provided at the lower end of the valve core. The rubber sealing gasket can seal against the valve seat to isolate the two ends of the valve body.

[0003] During actual use, as the stop valve gradually opens and closes, the fluid's flow space through the valve seat decreases, accelerating the fluid flow at this location to form a high-speed motion state. This significantly increases the fluid shear rate and the friction on the rubber gasket. This friction in turn causes the rubber gasket to generate a radial force along the direction of fluid flow, away from the center of the valve core. At the same time, as the stop valve cuts off the water flow, the water flow is interrupted, and the inertial force of the water flow generates a water hammer that impacts the rubber gasket. At the same time, the friction generated by the high-speed fluid flowing through the rubber gasket also impacts the rubber gasket. The impact of the two on the rubber gasket causes the rubber gasket to move relative to each other, resulting in a gap at the connection between the rubber gasket and the valve core. During the flow process, the fluid continuously enters this gap, pushing the rubber gasket out of the stop valve core along the direction of fluid flow, causing the stop valve to lose its sealing function. Summary of the Invention

[0004] The purpose of this utility model is to solve the above problems in the prior art and to provide an impact-resistant stop valve. The technical problem to be solved by this utility model is how to improve the sealing reliability of the stop valve.

[0005] The purpose of this utility model can be achieved through the following technical solutions:

[0006] A shock-resistant stop valve comprises a valve body and a valve core which is movably arranged in the valve body up and down, the inner wall of the valve body is provided with a valve seat for connecting the two ends of the valve body, the valve core and the valve seat are arranged opposite to each other up and down, and is characterized in that the lower end of the valve core has a receiving groove, and a sealing gasket is provided in the receiving groove, and a positioning plate is provided in the positioning groove, the positioning plate and the sealing gasket are fixedly connected to the valve core by fasteners, and the sealing gasket can abut against the valve seat to separate the two sides of the valve seat.

[0007] In this impact-resistant globe valve, a gasket that can be in sealing contact with the valve seat up and down is arranged in the accommodating groove, so that the groove wall of the accommodating groove can limit the lateral movement of the gasket. At the same time, by adding a positioning plate embedded in the positioning groove of the gasket and fixing the positioning plate and the gasket to the valve core through fasteners, the positioning plate and the fasteners can limit the vertical movement of the gasket, thereby preventing the gasket from shifting relative to the valve core when impacted by the high-speed fluid in the globe valve, ensuring the effect of the gasket being in sealing contact with the valve seat up and down, and thus improving the sealing reliability of the globe valve.

[0008] In the above-mentioned impact-resistant globe valve, the inner side wall of the accommodating groove has a fixing groove, the outer side wall of the gasket has a convex portion, and the convex portion is embedded in the fixing groove. The lower end of the gasket has a positioning groove. This structure can, on the one hand, prevent the fluid in the valve body from entering from the connection between the gasket and the inner side wall of the accommodating groove, and can also prevent the edge of the gasket from deforming and generating relative movement under the impact of high-speed fluid. On the other hand, it can play a role in limiting the movement of the gasket and preventing the overall relative displacement of the gasket, so as to ensure that the gasket can be in sealing contact with the valve seat up and down, and further improve the sealing reliability of the globe valve.

[0009] In the above-mentioned impact-resistant globe valve, both the fixing groove and the convex portion are annular or both are U-shaped. This structure can offset the left-right relative movement generated by the rubber gasket, making the sealing performance between the gasket and the inner side wall of the accommodating groove better, and being able to better prevent fluid from seeping in.

[0010] In the above-mentioned impact-resistant globe valve, the bottom wall of the positioning groove has a protruding portion, and the upper end of the positioning plate has a recessed portion, and the protruding portion is embedded in the recessed portion. This structure can further prevent the gasket from moving relatively when impacted by high-speed fluid.

[0011] In the above-mentioned impact-resistant globe valve, the lower end of the positioning plate has an annular stepped portion, the fasteners are bolts and there are multiple bolts. The multiple bolts are respectively arranged on the recessed portion and the stepped portion of the positioning plate, and the diameter of the bolts arranged on the recessed portion is larger than the diameter of the bolts arranged on the stepped portion. By using bolts for simple mechanical connection, during the installation process of the globe valve components, the gasket is subjected to a certain degree of extrusion force in the vertical direction and is fastened to the valve core together, causing a certain amount of compression of the gasket during the installation process, fastening the gasket and making it play a sealing effect at the same time, making it not easy to fall off. At the same time, this structure is convenient for installation and easy to replace the gasket.

[0012] In the above-mentioned impact-resistant globe valve, the positioning plate is made of metal material. The positioning plate made of metal material has a relatively high strength, so that the gasket is subjected to a certain degree of extrusion by the positioning plate in the vertical direction, making it more difficult to fall off and shift.

[0013] In the above-mentioned impact-resistant globe valve, the lower end of the positioning plate protrudes from the valve core, and the part of the positioning plate protruding from the valve core can extend into the valve seat of the valve body. The above structure can offset the impact of water hammer on the gasket to a certain extent, thereby improving the sealing reliability of the globe valve.

[0014] In the above-mentioned impact-resistant globe valve, the top of the valve core has a cylindrical connecting portion. The inner side wall of the connecting portion has internal threads, and the cross-section of the outer side wall of the connecting portion is hexagonal. The above structure can facilitate the connection between the valve core and the connecting piece, making the up and down movement control of the valve core more convenient, and setting the outer side wall of the connecting portion to have a hexagonal cross-section can play a role in preventing rotation.

[0015] Compared with the prior art, the advantages of this impact-resistant globe valve are as follows: This impact-resistant globe valve can prevent the gasket from deforming or shifting relative to the valve core when being impacted by the high-speed fluid in the globe valve, ensuring the effect of the gasket and the valve seat being sealed against each other up and down, thereby improving the sealing reliability of the globe valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of this impact-resistant globe valve.

[0017] Figure 2 is a cross-sectional view of this impact-resistant globe valve.

[0018] Figure 3 is an exploded view of the valve core of this impact-resistant globe valve.

[0019] In the figure, 1. Valve body; 1a. Valve seat; 2. Valve core; 2a. Accommodating groove; 2b. Fixed groove; 2c. Connecting portion; 3. Gasket; 3a. Positioning groove; 3b. Outer convex portion; 3c. Protruding portion; 4. Positioning plate; 4a. Recessed portion; 4b. Step portion; 5. Fastener. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0021] An impact-resistant globe valve, referring to Figures 1 - 3, including a valve body 1 and a valve core 2 movably arranged in the valve body 1 up and down, the inner wall of the valve body 1 has a valve seat 1a for connecting the two ends of the valve body 1, the valve core 2 and the valve seat 1a are arranged opposite to each other up and down, the lower end of the valve core 2 has a receiving groove 2a, and a sealing gasket 3 is arranged in the receiving groove 2a, the lower end of the sealing gasket 3 has a positioning groove 3a, and a positioning plate 4 is arranged in the positioning groove 3a, the positioning plate 4 and the sealing gasket 3 are fixedly connected to the valve core 2 by fasteners 5, and the sealing gasket 3 can abut against the valve seat 1a to separate the two sides of the valve seat 1a.

[0022] Specifically, refer to Figures 1 - 3 , the lower end of the positioning plate 4 protrudes from the valve core 2, and the part of the positioning plate 4 protruding from the valve core 2 can extend into the valve seat 1a of the valve body 1; the top of the valve core 2 has a cylindrical connecting portion 2c, the inner side wall of the connecting portion 2c has an internal thread, and the cross-section of the outer side wall of the connecting portion 2c is hexagonal; the lower end of the positioning plate 4 has an annular step portion 4b, and in this embodiment, the fastener 5 is preferably a bolt and has multiple bolts, and the multiple bolts are respectively arranged on the recessed portion 4a and the step portion 4b of the positioning plate 4, and the diameter of the bolt arranged on the recessed portion 4a is larger than the diameter of the bolt arranged on the step portion 4b; the sealing gasket 3 is preferably made of rubber material, and the positioning plate 4 is preferably made of metal material, such as a metal gasket.

[0023] Further, refer to Figures 1 - 3 In this embodiment, the fixing groove 2b and the outer protrusion 3b are preferably both annular or U-shaped.

[0024] Furthermore, refer to Figures 1 - 3 The bottom wall of the positioning groove 3a has a protrusion 3c, the upper end of the positioning plate 4 has a recessed portion 4a, and the protrusion 3c is embedded in the recessed portion 4a.

[0025] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. An impact-resistant globe valve, comprising a valve body (1) and a valve core (2) movably arranged up and down in the valve body (1). A valve seat (1a) for communicating both ends of the valve body (1) is provided on the inner wall of the valve body (1). The valve core (2) is arranged opposite to the valve seat (1a) up and down, and is characterized in that, The lower end of the valve core (2) has a receiving groove (2a), and a sealing gasket (3) is arranged in the receiving groove (2a); the lower end of the sealing gasket (3) has a positioning groove (3a), and a positioning plate (4) is arranged in the positioning groove (3a); the positioning plate (4) and the sealing gasket (3) are fixedly connected to the valve core (2) through a fastener (5), and the sealing gasket (3) can abut against the valve seat (1a) to separate the two sides of the valve seat (1a).

2. The impact-resistant stop valve according to claim 1, characterized in that, The inner side wall of the accommodating groove (2a) is provided with a fixing groove (2b), the outer side wall of the sealing gasket (3) is provided with an outer convex portion (3b), and the outer convex portion (3b) is embedded in the fixing groove (2b).

3. The impact-resistant stop valve according to claim 2, characterized in that, The fixing groove (2b) and the outer protrusion (3b) are both annular or U-shaped.

4. The impact-resistant stop valve according to claim 1, wherein, The bottom wall of the positioning groove (3a) is provided with a raised portion (3c), the upper end of the positioning plate (4) is provided with a recessed portion (4a), and the raised portion (3c) is embedded in the recessed portion (4a).

5. The impact-resistant stop valve according to claim 4, characterized in that, The lower end of the positioning plate (4) has an annular step portion (4b), and the fastener (5) is a bolt and has a plurality of bolts, and the plurality of bolts are respectively arranged on the recessed portion (4a) and the step portion (4b) of the positioning plate (4), and the diameter of the bolt arranged on the recessed portion (4a) is larger than the diameter of the bolt arranged on the step portion (4b).

6. The impact-resistant stop valve according to claim 4, characterized in that, The positioning plate (4) is made of metal material.

7. A shock-resistant globe valve according to any one of claims 1-6, characterized in that, The lower end of the positioning plate (4) protrudes from the valve core (2), and the portion of the positioning plate (4) protruding from the valve core (2) can extend into the valve seat (1a) of the valve body (1).

8. A shock-resistant stop valve according to any one of claims 1-6, characterized in that, The top of the valve core (2) has a cylindrical connecting portion (2c), the inner side wall of the connecting portion (2c) has an internal thread, and the cross section of the outer side wall of the connecting portion (2c) is hexagonal.

Images