Safety valve with valve clack capable of being used on two sides

Abstract

According to the technical scheme, the safety valve is characterized in that the safety valve comprises a valve body, a recoil disc located in the valve body, the valve clack located in the recoil disc and a valve seat capable of abutting against the valve clack, and the valve clack comprises a bottom face facing the valve seat and a top face facing the recoil disc; the bottom face and the top face are each provided with a sealing part capable of forming hard sealing with the valve seat and a centering groove coaxial with the recoil disc, an inner cavity of the centering groove is in a conical shape, and the recoil disc is provided with a centering sliding piece coaxial with the centering groove and capable of partially stretching into the centering groove. The problems that in the prior art, a valve clack is frequently replaced, and the use cost is high are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valves, and more particularly to a safety valve with a valve flap capable of being used on both sides. Background Art

[0002] Safety valves are widely used in various fields such as petroleum, chemical industry, power stations, metallurgy, nuclear power, and national defense. When the pressure in the protected system exceeds the set pressure of the safety valve, the safety valve opens to relieve the pressure in the system to prevent the pressure in the system from continuing to rise and damaging the system. When the pressure in the system decreases, the safety valve returns to its seat to prevent the medium in the system from continuing to be discharged and wasting energy.

[0003] Refer to the attached Figure 1 As shown, the conventional safety valve includes a valve body, a valve stem elastically connected to the valve body, a recoil disk that contacts one end of the valve stem, and a valve disc limited in the recoil disk. The sealing surfaces of the valve disc and the valve seat fit together to form a hard seal. The upper and lower surfaces of the existing valve disc are respectively processed with a sealing surface that forms a hard seal with the valve seat and a raised portion that contacts the recoil disk and is used for centering. The existing valve disc has only one side with a sealing function. After the sealing surface is worn, it needs to be replaced. The valve disc needs to be replaced frequently, which increases the cost of use and causes serious waste of resources. Utility Model Content

[0004] In view of the shortcomings of the prior art, the utility model aims to provide a safety valve whose valve disc can be used on both sides and reduces the cost of use.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a safety valve with a valve disc that can be used on both sides, comprising a valve body, a recoil disc located in the valve body, a valve disc positioned in the recoil disc and a valve seat that can touch the valve disc, the valve disc comprising a bottom surface facing the valve seat and a top surface facing the recoil disc, the bottom surface and the top surface are both provided with a sealing portion that can form a hard seal with the valve seat and a centering groove that is coaxial with the recoil disc and has a conical inner cavity, the recoil disc is provided with a centering slide that is coaxial with the centering groove and can partially extend into the centering groove, and the valve disc is turned over so that the bottom surface or the top surface faces the valve seat.

[0006] As a further improvement of the present invention, a plurality of limiting grooves distributed in a circle around the valve disc axis are arranged on the peripheral wall of the valve disc, and a fastening screw corresponding to the plurality of limiting grooves is threadedly connected on the peripheral wall of the recoil disk, and the valve disc is limited in the recoil disk by extending one end of the fastening screw into the corresponding limiting groove.

[0007] The beneficial effects of the utility model are as follows: by flipping the valve flap so that the bottom surface or the top surface faces the valve seat and can form a hard seal with the valve seat, compared with the prior art in which the bottom surface and the top surface of the valve flap are designed to have the same structure, such a design can realize the reuse of the valve flap, thereby extending the service life of the valve flap, reducing the replacement frequency of the valve flap, reducing the cost of use and reducing the waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural schematic diagram of the prior art;

[0009] Figure 2 It is a schematic diagram of the structure of the utility model;

[0010] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0011] Figure numerals: 1. valve body; 2. recoil disk; 21. centering slide; 22. fastening screw; 3. valve disc; 31. bottom surface; 32. top surface; 33. sealing part; 34. centering groove; 35. limit groove; 4. valve seat. DETAILED DESCRIPTION

[0012] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments, wherein the same components are indicated by the same reference numerals.

[0013] Reference Figures 1 to 3 As shown, a safety valve with a valve disc capable of being used on both sides of the present embodiment comprises a valve body 1, a recoil disc 2 located in the valve body 1, a valve disc 3 positioned in the recoil disc 2, and a valve seat 4 capable of contacting the valve disc 3, wherein the valve disc 3 comprises a bottom surface 31 facing the valve seat 4 and a top surface 32 facing the recoil disc 2;

[0014] Based on the above-mentioned prior art, the bottom surface 31 and the top surface 32 of the valve disc 3 are processed into the same structure, that is, the bottom surface 31 and the top surface 32 are both processed with a sealing portion 33 and a centering groove 34 coaxial with the valve disc 3, the inner cavity of the centering groove 34 is in a conical shape, and the recoil disc 2 is integrally formed with a centering slide 21 that can partially extend into the centering groove 34, and the end surface of the centering slide 21 that is not connected to the recoil disc 2 is an arc surface. In the process of the valve disc 3 being installed in the recoil disc 2, the end of the centering slide 21 extends into the centering groove 34, and as the centering slide 21 continues to extend into the centering groove 34, the end of the centering slide 21 touches the groove wall of the centering groove 34 and slides relatively, until the centering slide 21 is coaxial with the centering groove 34 and touches in place, then the valve disc 3 is installed in place in the recoil disc 2;

[0015] In the initial state, the bottom surface 31 faces the valve seat 4, and the top surface 32 faces the recoil disc 2; when the sealing portion 33 of the bottom surface 31 is damaged by multiple collisions, the valve disc 3 is removed from the recoil disc 2, and then the valve disc 3 is turned 180 degrees with the diameter as the axis, so that the bottom surface 31 faces upward and the top surface 32 faces downward, and then the valve disc 3 is reinstalled into the recoil disc 2 until the centering slide 21 and the centering groove 34 on the bottom surface 31 touch each other in place, and normal use is restored, and an effective hard seal is formed between the top surface 32 and the valve seat 4;

[0016] Compared with the prior art in which the bottom surface 31 and the top surface 32 of the valve flap 3 are designed to have the same structure, such a design can realize the reuse of the valve flap 3, thereby extending the service life of the valve flap 3, reducing the replacement frequency of the valve flap 3, reducing the use cost and reducing the waste of resources.

[0017] As a specific implementation of the improvement, since the valve flap 3 is made of hard alloy, it is difficult to process the external thread and the die is easily damaged; at the same time, after the valve flap 3 is screwed into the recoil disc 2, the part of the valve flap 3 exposed outside the recoil disc 2 is small and not easy to be grasped, making it difficult to disassemble the valve flap 3 relative to the recoil disc 2. In order to solve the above problems, refer to Figure 3 As shown, a plurality of limiting grooves 35 are turned on the peripheral wall of the valve disc 3 and are circumferentially distributed around the axis of the valve disc 3, and holes are drilled and tapped on the peripheral wall of the recoil disc 2 to process the fastening screws 22 that can correspond to the plurality of limiting grooves 35 one by one;

[0018] In the initial state, the fastening screw 22 is screwed on the recoil disc 2 and the end of the fastening screw 22 extends into the corresponding limiting groove 35, and the valve disc 3 is limited in the recoil disc 2. In the process of disassembling the valve disc 3, the fastening screws 22 are screwed out from the recoil disc 2 one by one, so that the valve disc 3 can fall out of the recoil disc 2; the limiting groove 35 on the valve disc 3 is rotated to be in the same vertical line as the threaded hole, and then the recoil disc 2 is installed, and finally the fastening screws 22 are screwed on the recoil disc 2 one by one so that the valve disc 3 is limited in the recoil disc 2;

[0019] Compared with the threaded connection design in the prior art, this design facilitates the disassembly and assembly of the valve flap 3, while reducing the complexity of the peripheral wall structure of the valve flap 3 and reducing the difficulty of processing; further, it is explained that the number of the limiting grooves 35 is determined according to actual needs.

[0020] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A safety valve with a valve flap that can be used on both sides, comprising a valve body (1), a recoil disc (2) located in the valve body (1), a valve flap (3) positioned in the recoil disc (2), and a valve seat (4) that can contact the valve flap (3), wherein the valve flap (3) comprises a bottom surface (31) facing the valve seat (4) and a top surface (32) facing the recoil disc (2), and is characterized in that: The bottom surface (31) and the top surface (32) are both provided with a sealing portion (33) capable of forming a hard seal with the valve seat (4) and a centering groove (34) coaxial with the recoil disc (2) and having a conical inner cavity. The recoil disc (2) is provided with a centering slide (21) coaxial with the centering groove (34) and capable of partially extending into the centering groove (34). The valve disc (3) is turned over so that the bottom surface (31) or the top surface (32) faces the valve seat (4).

2. A safety valve with a valve disc that can be used on both sides according to claim 1, characterized in that: A plurality of limiting grooves (35) are arranged on the peripheral wall of the valve disc (3) and are distributed in a circumferential manner around the axis of the valve disc (3). A fastening screw (22) corresponding to the plurality of limiting grooves (35) is threadedly connected to the peripheral wall of the recoil disc (2). One end of the fastening screw (22) extends into the corresponding limiting groove (35), so that the valve disc (3) is limited in the recoil disc (2).

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