Safety valve for pipeline

Abstract

The safety valve for the pipeline comprises a valve body and a valve cover located over the valve body, a second rubber ring is arranged at an upper-layer notch of the top end of the inner wall of the valve body, two third rubber rings which are stacked are arranged at a lower-layer notch of the top end of the inner wall of the valve body, and an inserting groove is formed in the top end of the valve body. An inserting ring is arranged at the position, corresponding to the inserting groove, of the bottom end of the valve cover, and the inserting ring is matched with the inserting groove; the inserting groove is formed in the top end of the valve body, the inserting ring is arranged at the bottom end of the valve cover, the inserting groove is matched with the inserting ring, the first rubber ring on the inserting ring is in contact extrusion with the side face of the top end of the inserting groove, and the second rubber ring at the top end of the valve body is in contact extrusion with the bottom end of the valve cover. And two third rubber rings stacked at the top end of the valve body are in contact extrusion with the outer side of the top end of the guide sleeve, so that the multi-layer sealing effect is achieved, the sealing performance between the valve cover and the valve body is optimal, the service life of the safety valve is prolonged, and the safety performance of the safety valve for the pipeline is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valves, in particular to a safety valve for pipelines. Background Art

[0002] Safety valves are special valves whose opening and closing parts are in a normally closed state under the action of external forces. When the medium pressure in the equipment or pipeline exceeds the specified value, the medium is discharged to the outside of the system to prevent the medium pressure in the pipeline or equipment from exceeding the specified value. Safety valves belong to the automatic valve category and are mainly used in boilers, pressure vessels and pipelines to control the pressure not to exceed the specified value, playing an important protective role in personal safety and equipment operation.

[0003] In the prior art, the connection between the valve cover and the valve body is only fixed by the cooperation of evenly distributed nuts and bolts, and a gap is easily formed between the valve cover and the valve body, resulting in gas or fluid leakage. Summary of the invention

[0004] The utility model aims to provide a safety valve for pipelines to solve the problem in the prior art that the connection between the valve cover and the valve body is only fixed by evenly distributed nuts and bolts, and a gap is easily formed between the valve cover and the valve body, resulting in gas or fluid leakage.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a safety valve for pipelines, comprising a valve body and a valve cover located directly above the valve body, a second rubber ring is provided at the upper recess at the top of the inner wall of the valve body and two stacked third rubber rings are provided at the lower recess, a slot is provided at the top of the valve body, an insert ring is provided at the bottom end of the valve cover at a position corresponding to the slot, the insert ring cooperates with the slot, a first rubber ring is provided at the top of the insert ring, and the first rubber ring contacts the side surface of the slot;

[0006] The inner hollow of the valve body is provided with a pressure relief channel, the bottom end of the valve body is fixedly connected to a valve seat, the inner hollow of the valve seat is provided with a fluid channel, the top end of the valve seat is provided with a valve disc, and a recoil disc matching the shape of the valve disc is provided directly above the valve disc, the top of the recoil disc is slidably sleeved with a guide sleeve, the outer side of the top end of the guide sleeve is in contact with the two third rubber rings, a valve stem is provided at the center of the inner hollow of the valve cover, the outer side of the valve stem is slidably sleeved with a spring, and the bottom end of the spring is flush with the bottom end of the valve cover.

[0007] The valve stem passes through the top center of the valve cover, an adjusting nut sleeve matching with the valve stem is provided on the outer side of the top of the valve stem, and a locking bolt is provided on the outer side of the adjusting nut sleeve.

[0008] The outer wall size of the recoil disc matches the inner wall size of the guide sleeve, and the concave shape of the top end of the recoil disc matches the pointed head of the bottom end of the valve stem.

[0009] Wherein, a telescopic gap is left between the bottom end of the guide sleeve and the edge of the valve disc.

[0010] When the air pressure in the fluid channel reaches a set value, the bottom end of the valve flap is pushed upward by the pressure, the bottom end of the valve flap is separated from the top end of the valve seat, and the fluid channel is connected to the pressure relief channel.

[0011] Wherein, when the bottom end of the valve disc contacts the top end of the valve seat, the guide sleeve and the recoil disk form a hollow cavity, and the bottom end of the valve stem extends into the hollow cavity.

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

[0013] The utility model provides a slot at the top end of the valve body, and an insert ring at the bottom end of the valve cover. The slot and the insert ring cooperate with each other, and a first rubber ring on the insert ring is in contact and extrusion with the side surface of the top end of the slot, a second rubber ring at the top end of the valve body is in contact and extrusion with the bottom end of the valve cover, and two stacked third rubber rings at the top end of the valve body are in contact and extrusion with the outer side of the top end of the guide sleeve, so as to achieve a multi-level sealing effect, ensure the best sealing performance between the valve cover and the valve body, extend the service life of the safety valve, and provide the safety performance of the safety valve for pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the cross-sectional structure of a safety valve for pipelines of the utility model;

[0015] Figure 2 This is a schematic diagram of the enlarged structure of a safety valve cover for pipelines of the utility model;

[0016] Figure 3 This is a schematic diagram of the enlarged structure of a safety valve body for pipelines of the utility model;

[0017] Figure 4 for Figure 1 Schematic diagram of the structure at point A in the middle.

[0018] In the figure: 10, valve seat; 11, fluid channel; 20, valve disc; 30, recoil disk; 40, guide sleeve; 50, valve stem; 60, spring; 70, valve cover; 71, first rubber ring; 72, insert ring; 73, bolt; 80, valve body; 81, second rubber ring; 82, slot; 83, third rubber ring; 84, pressure relief channel; 90, adjusting nut sleeve; 91, locking bolt. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] See also Figure 1-4 The utility model provides a technical solution: a safety valve for pipelines, comprising a valve body 80 and a valve cover 70 located directly above the valve body 80, a second rubber ring 81 is provided at the upper recess at the top of the inner wall of the valve body 80, and two stacked third rubber rings 83 are provided at the lower recess, a slot 82 is provided at the top of the valve body 80, an insert ring 72 is provided at the bottom end of the valve cover 70 corresponding to the slot 82, the insert ring 72 is matched with the slot 82, a first rubber ring 71 is provided at the top of the insert ring 72, and the first rubber ring 71 contacts the side surface of the slot 82 , by providing a slot 82 at the top of the valve body 80 and an insert ring 72 at the bottom of the valve cover 70, the slot 82 cooperates with the insert ring 72, the first rubber ring 71 on the insert ring 72 contacts and squeezes the top side of the slot 82, the second rubber ring 81 at the top of the valve body 80 contacts and squeezes the bottom of the valve cover 70, and the two stacked third rubber rings 83 at the top of the valve body 80 contact and squeeze the top outer side of the guide sleeve 40, so as to achieve a multi-level sealing effect, and ensure the best sealing performance between the valve cover 70 and the valve body 80;

[0021] A pressure relief passage 84 is provided in the hollow interior of the valve body 80. A valve seat 10 is fixedly connected to the bottom end of the valve body 80. A fluid passage 11 is provided in the hollow interior of the valve seat 10. A valve disc 20 is provided at the top of the valve seat 10. A recoil disc 30 matching the shape of the valve disc 20 is provided directly above the valve disc 20. A guide sleeve 40 is slidably sleeved on the top of the recoil disc 30. The top outer side of the guide sleeve 40 contacts with two third rubber rings 83. A valve stem 50 is provided at the center of the hollow interior of the valve cover 70. A spring 60 is slidably sleeved on the outer side of the valve stem 50. The bottom end of the spring 60 is flush with the bottom end of the valve cover 70. When the steam pressure in the fluid passage 11 inside the valve disc 20 exceeds the pressing force of the spring 60, the valve disc 20 is pushed open. After the valve disc 20 is pushed open, steam is continuously discharged, and the steam pressure in the fluid passage 11 is gradually reduced. At this time, the action force of the spring 60 will overcome the steam pressure and the reaction force of the exhaust steam acting on the valve disc 20, thereby closing the safety valve.

[0022] Among them, the valve stem 50 passes through the top center of the valve cover 70, and an adjusting nut sleeve 90 that cooperates with the valve stem 50 is provided on the outer side of the top of the valve stem 50. A locking bolt 91 is provided on the outer side of the adjusting nut sleeve 90, and the compression amount of the spring 60 can be adjusted by rotating the locking bolt 91.

[0023] Among them, the outer wall size of the recoil disk 30 matches the size of the inner wall of the guide sleeve 40, and the concave shape at the top of the recoil disk 30 matches the pointed head at the bottom of the valve stem 50, so that when the valve disc 20 drives the recoil disk 30 to move upward, the top of the recoil disk 30 fits with the bottom of the valve stem 50.

[0024] Among them, a telescopic gap is left between the bottom end of the guide sleeve 40 and the edge of the valve flap 20. When the steam pressure in the fluid channel 11 inside the valve flap 20 exceeds the compression force of the spring 60, the valve flap 20 is pushed open, and the telescopic gap is used to ensure that the valve flap 20 can be pushed open smoothly.

[0025] Among them, when the air pressure in the fluid channel 11 reaches the set value, the bottom end of the valve flap 20 is pushed upward by the pressure, the bottom end of the valve flap 20 is separated from the top end of the valve seat 10, and the fluid channel 11 is connected with the pressure relief channel 84. After the valve flap 20 is pushed open, the steam is continuously discharged, and the steam pressure in the fluid channel 11 gradually decreases. At this time, the action force of the spring 60 will overcome the steam pressure acting on the valve flap 20 and the reaction force of the exhaust steam, thereby closing the safety valve.

[0026] Among them, when the bottom end of the valve disc 20 contacts the top end of the valve seat 10, the guide sleeve 40 and the recoil disc 30 form a hollow cavity, and the bottom end of the valve stem 50 extends into the hollow cavity, so that when the valve disc 20 drives the recoil disc 30 to move upward, the hollow cavity ensures that the recoil disc 30 is not affected when moving upward.

[0027] Working principle: When in use, a slot 82 is provided at the top of the valve body 80, and an insert ring 72 is provided at the bottom of the valve cover 70. The slot 82 cooperates with the insert ring 72, and the first rubber ring 71 on the insert ring 72 contacts and squeezes the top side of the slot 82, the second rubber ring 81 at the top of the valve body 80 contacts and squeezes the bottom of the valve cover 70, and the two stacked third rubber rings 83 at the top of the valve body 80 contact and squeeze the top outer side of the guide sleeve 40, so as to achieve a multi-level sealing effect, ensure the best sealing performance between the valve cover 70 and the valve body 80, extend the service life of the safety valve, and provide the safety performance of the pipeline safety valve.

[0028] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

Claims

1. A safety valve for a pipeline, comprising a valve body (80) and a valve cover (70) located directly above the valve body (80), characterized in that: A second rubber ring (81) is provided at the upper recess at the top of the inner wall of the valve body (80), and two stacked third rubber rings (83) are provided at the lower recess. A slot (82) is provided at the top of the valve body (80). An insert ring (72) is provided at the bottom of the valve cover (70) at a position corresponding to the slot (82). The insert ring (72) matches the slot (82). A first rubber ring (71) is provided at the top of the insert ring (72). The first rubber ring (71) contacts the side surface of the slot (82). A pressure relief passage (84) is provided in the hollow interior of the valve body (80); a valve seat (10) is fixedly connected to the bottom end of the valve body (80); a fluid passage (11) is provided in the hollow interior of the valve seat (10); a valve flap (20) is provided at the top end of the valve seat (10); a recoil disc (30) matching the shape of the valve flap (20) is provided directly above the valve flap (20); a guide sleeve (40) is slidably sleeved on the top of the recoil disc (30); the outer side of the top end of the guide sleeve (40) contacts the two third rubber rings (83); a valve stem (50) is provided at the center of the hollow interior of the valve cover (70); a spring (60) is slidably sleeved on the outer side of the valve stem (50); the bottom end of the spring (60) is flush with the bottom end of the valve cover (70).

2. A pipeline safety valve according to claim 1, characterized in that: The valve stem (50) passes through the center of the top end of the valve cover (70), an adjusting nut sleeve (90) matching with the valve stem (50) is provided on the outer side of the top end of the valve stem (50), and a locking bolt (91) is provided on the outer side of the adjusting nut sleeve (90).

3. A pipeline safety valve according to claim 1, characterized in that: The outer wall size of the recoil disc (30) matches the inner wall size of the guide sleeve (40), and the concave shape at the top end of the recoil disc (30) matches the pointed head at the bottom end of the valve stem (50).

4. A pipeline safety valve according to claim 1, characterized in that: A telescopic gap is left between the bottom end of the guide sleeve (40) and the edge of the valve flap (20).

5. A pipeline safety valve according to claim 1, characterized in that: When the air pressure in the fluid channel (11) reaches a set value, the bottom end of the valve flap (20) is pushed upward by the pressure, the bottom end of the valve flap (20) is separated from the top end of the valve seat (10), and the fluid channel (11) is connected to the pressure relief channel (84).

6. A pipeline safety valve according to claim 1, characterized in that: When the bottom end of the valve disc (20) contacts the top end of the valve seat (10), the guide sleeve (40) and the recoil disc (30) form a hollow cavity, and the bottom end of the valve stem (50) extends into the hollow cavity.

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