Two-stage safety valve

Abstract

The utility model discloses a two-stage safety valve, including the valve body, the valve cavity is set up in the valve body inside through, the first valve seat and second valve seat are sequentially set up from left to right in the valve cavity inside, and the first valve seat and second valve seat interval setting, and the first valve seat and second valve seat center are provided with the oil passage respectively, the first valve core is provided with in the first valve seat right side, the second valve core is provided with in the second valve seat right side, the flow channel is provided with respectively on the first valve core and second valve core, the oil inlet that communicates with the left side of valve cavity is provided with in the valve body left side, and the oil outlet that communicates with the right side of valve cavity is provided with in the valve body right side, the utility model discloses through setting up the first valve core and second valve core of interval arrangement in the valve cavity, can buffer medium pressure, through two -stage valve core and carry out again pressure relief, avoid medium pressure when being too high directly impact the first valve core and cause safety valve damage, prolong the service life of safety valve.

Description

Technical Field

[0001] This utility model relates to the field of safety valve technology, specifically to a two-stage safety valve. Background Technology

[0002] A safety valve is a special valve whose opening and closing elements are normally closed under the action of external force. When the pressure of the medium in the equipment or pipeline rises above the specified value, it prevents the pressure of the medium in the pipeline or equipment from exceeding the specified value by discharging the medium to the outside of the system.

[0003] Currently available safety valves are typically single-stage safety valves. When the pressure of the medium inside the safety valve exceeds the limit of the valve core, the valve core will be damaged and unable to buffer the excess medium pressure, thus affecting the performance of the safety valve and requiring frequent replacement. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a two-stage safety valve that uses two-stage valve cores to buffer when the internal medium pressure is too high, so as to avoid damage to the safety valve caused by excessive medium pressure.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0006] A two-stage safety valve includes a valve body with a valve chamber extending through it. An end cap is located at the left end of the valve chamber, and a bolt plug is threaded onto the right end. Inside the valve chamber, from left to right, are a first valve seat and a second valve seat, spaced apart. Each valve seat has an oil passage at its center. A first valve core, slidingly fitted with the oil passage of the first valve seat to control oil entry, is located on the right side of the first valve seat. A second valve core, slidingly fitted with the oil passage of the second valve seat to control oil entry, is located on the right side of the second valve seat. Each valve core has a flow channel for draining oil into the valve chamber on its right side. An oil inlet communicating with the left side of the valve chamber is located on the left side of the valve body, and an oil outlet communicating with the right side of the valve chamber is located on the right side of the valve body.

[0007] The above-mentioned two-stage safety valve has a first valve core and a second valve core, which respectively include a conical part and a cylindrical part. The conical part is connected to the oil passage, the cylindrical part is slidably disposed inside the valve cavity, and the flow channel is disposed through the cylindrical part.

[0008] The aforementioned two-stage safety valve also has a lubrication groove on the outer wall of the cylindrical part to store oil and ensure smooth movement of the valve core when oil passes through.

[0009] In the aforementioned two-stage safety valve, a first spring is provided between the right end of the first valve core and the left end of the second valve seat.

[0010] In the aforementioned two-stage safety valve, a second spring is provided between the right end of the second valve core and the left end of the bolt plug.

[0011] Due to the adoption of the above technical solutions, the technological progress achieved by this utility model is as follows.

[0012] This utility model provides a two-stage safety valve. By setting a first valve core and a second valve core arranged at intervals in the valve cavity, the medium pressure can be buffered, and the pressure can be released again through the second-stage valve core. This avoids the safety valve from being damaged by the first-stage valve core when the medium pressure is too high. Moreover, in order to avoid the safety valve's poor sealing performance and the valve core's movement being obstructed due to severe wear during the valve core's movement, a lubrication groove is opened on the outside of the valve core. Oil is immersed in the lubrication groove to play a lubricating role, ensuring smooth valve core movement, preventing the valve core from wearing out too quickly, and extending the service life of the safety valve. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the specific structure of the present utility model;

[0014] Figure 2 This is a schematic diagram of the specific structure of the end cap described in this utility model;

[0015] Figure 3 This is a schematic diagram of the specific structure of the first valve core or the second valve core of this utility model.

[0016] The components are: 1. Valve body, 2. Oil inlet, 3. Oil outlet, 4. End cap, 5. First valve seat, 6. First valve core, 7. Second valve seat, 8. Second valve core, 9. Bolt plug, 10. First spring, 11. Second spring, 12. Oil outlet, 13. Flow channel, 14. Lubrication groove. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Two-stage safety valves, such as Figures 1 to 3 As shown, the valve includes a valve body 1, with a valve cavity extending through the valve body 1. An oil inlet 2 communicating with the left side of the valve cavity is located on the left side of the valve body 1, and an oil outlet 3 communicating with the right side of the valve cavity is located on the right side of the valve body 1. An end cap 4 is located at the left end of the valve cavity, and a bolt plug 9 is threaded onto the right end of the valve cavity. A first valve seat 5 and a second valve seat 7 are arranged sequentially from left to right inside the valve cavity, spaced apart. An oil passage is provided at the center of each of the first and second valve seats 7. A first valve core 6, slidably fitted with the oil passage of the first valve seat 5, is located on the right side of the first valve seat 5, and a second valve core 8, slidably fitted with the oil passage of the second valve seat 7, is located on the right side of the second valve seat 7.

[0019] The first valve core 6 and the second valve core 8 are respectively provided with flow channels 13, which facilitates the flow of oil through the valve core to the right valve chamber.

[0020] The first valve core 6 and the second valve core 8 each include a conical part and a cylindrical part. The conical part is connected to the oil passage, the cylindrical part is slidably disposed inside the valve cavity, and the flow channel 13 is disposed through the cylindrical part.

[0021] A lubrication groove 14 is also provided on the outer wall of the column. When oil passes through the lubrication groove, it will be stored in the lubrication groove and play a lubricating role, thereby ensuring that the first valve core and the second valve core move smoothly.

[0022] A first spring 10 is provided between the right end of the first valve core 6 and the left end of the second valve seat 7. When the first valve core moves backward under oil pressure, it will compress the first spring 10, which will open the oil passage on the first valve seat 5. The oil flows to the right valve chamber through the flow channel 13 on the first valve core. When the pressure applied to the first valve core is canceled or reduced, the valve core moves to the left to reset under the action of the first spring.

[0023] A second spring 11 is provided between the right end of the second valve core 8 and the left end of the bolt plug 9. When the second valve core moves backward under oil pressure, it will compress the second spring 11, which will open the oil passage on the second valve seat. The oil flows to the right valve chamber through the flow channel on the second valve core. When the pressure applied to the second valve core is canceled or reduced, the valve core moves to the left to reset under the action of the second spring.

[0024] Meanwhile, since the bolt plug 9 is threaded to the right end of the valve cavity, the force exerted by the second spring 11 on the second valve core can be adjusted by adjusting the position of the bolt plug 9 in the valve cavity, thereby regulating the oil pressure that controls the opening of the second valve core.

[0025] In this embodiment, the end cap 4 and the oil inlet 2 overlap. In order to ensure that the oil inlet can supply oil to the valve cavity smoothly, an oil passage 12 is provided on the end cap 4 opposite to the oil inlet 2. After the oil enters through the oil inlet 2, it first passes through the oil passage 12 on the end cap 4 and then enters the valve cavity.

[0026] The working principle of this utility model is as follows:

[0027] When the oil pressure at the inlet is greater than the opening pressure of the first valve core, the first valve core moves to the right, allowing the oil to flow into the valve chamber between the first valve seat and the second valve seat. If the oil pressure is less than the opening pressure of the second valve core, the second valve core does not open. If the oil pressure is greater than the opening pressure of the second valve core, the second valve core moves to the right, allowing the oil to flow into the valve chamber on the right side of the second valve core and be discharged through the outlet.

[0028] This utility model provides a two-stage safety valve. By setting a first valve core and a second valve core arranged at intervals in the valve cavity, the medium pressure can be buffered, and the pressure can be released again through the second-stage valve core. This avoids the safety valve from being damaged by the first-stage valve core when the medium pressure is too high. Moreover, in order to avoid the safety valve's poor sealing performance and the valve core's movement being obstructed due to severe wear during the valve core's movement, a lubrication groove is opened on the outside of the valve core. Oil is immersed in the lubrication groove to play a lubricating role, ensuring smooth valve core movement, preventing the valve core from wearing out too quickly, and extending the service life of the safety valve.

Claims

1. A two-stage safety valve, characterized in that: The valve body (1) has a valve cavity through which a valve cap (4) is provided on the left end of the valve cavity and a bolt plug (9) is threaded on the right end of the valve cavity. The valve cavity has a first valve seat (5) and a second valve seat (7) arranged from left to right. The first valve seat (5) and the second valve seat (7) are spaced apart. The first valve seat (5) and the second valve seat (7) are respectively provided with an oil passage in the center. The first valve seat (5) is provided with a first valve core (6) on the right side of the first valve seat (5) and slides with the oil passage of the first valve seat (5) to control the oil entry. The second valve seat (7) is provided with a second valve core (8) on the right side of the second valve seat (7) and slides with the oil passage of the second valve seat (7) to control the oil entry. The first valve core (6) and the second valve core (8) are respectively provided with a flow channel (13) to discharge oil into the valve cavity on the right side of the valve core. The valve body (1) has an oil inlet (2) on the left side that communicates with the left side of the valve cavity and an oil outlet (3) on the right side that communicates with the right side of the valve cavity.

2. The two-stage safety valve according to claim 1, characterized in that: The first valve core (6) and the second valve core (8) respectively include a conical part and a cylindrical part. The conical part is connected to the oil passage, the cylindrical part is slidably disposed inside the valve cavity, and the flow channel (13) is disposed through the cylindrical part.

3. The two-stage safety valve according to claim 2, characterized in that: The outer wall of the cylindrical part is also provided with a lubrication groove (14) to store oil when oil passes through, so as to ensure smooth movement of the valve core.

4. The two-stage safety valve according to claim 1, characterized in that: A first spring (10) is provided between the right end of the first valve core (6) and the left end of the second valve seat (7).

5. The two-stage safety valve according to claim 1, characterized in that: A second spring (11) is provided between the right end of the second valve core (8) and the left end of the bolt plug (9).

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