Quick response impulse safety valve

Abstract

The utility model discloses a quick response impulse safety valve relates to impulse safety valve technical field, including main valve seat and pilot valve seat, the outer wall of main valve seat is installed with no. The outer wall of pilot valve seat is installed with no. The one end of no. The outer wall of main valve seat is installed with pressure relief mechanism, and the other end of no. The utility model discloses, the series connection design of no. The opening of flow regulating valve can be adjusted through, and the pressure variation rate of main valve seat is accurately controlled, realizes the dynamic adjustment of main valve opening speed, and the pressure relief demand of different systems is adapted.

Description

Technical Field

[0001] This utility model relates to the field of impulse safety valve technology, and in particular to a fast-response impulse safety valve. Background Technology

[0002] In industrial production processes, impulse safety valves serve as a crucial line of defense for ensuring system pressure safety, and their importance is self-evident. They mainly consist of a main valve and a pilot valve working together. The pilot valve sensitively detects subtle changes in system pressure, thereby precisely controlling the opening and closing of the main valve to protect various equipment and pipelines from overpressure threats.

[0003] In existing technologies, the insufficient timeliness of pressure feedback between the pilot valve and the main valve is a major problem. Due to limitations in the design of the connecting pipeline and the inherent delay in signal transmission, when the system pressure rises rapidly, although the pilot valve can detect the pressure anomaly first, it cannot quickly transmit this critical signal to the main valve. This results in a delayed opening action of the main valve, which cannot release the rapidly accumulated pressure in the system in time. Taking a steam power generation system as an example, when the turbine load changes suddenly, the steam pressure may soar in a short period of time. If the impulse safety valve responds late, it will cause the steam pipeline to overpressure, leading to pipeline deformation or even rupture, which seriously threatens equipment safety and personnel lives. Utility Model Content

[0004] The purpose of this invention is to solve the problems existing in the prior art by proposing a fast-response impulse safety valve.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a fast-response impulse safety valve, comprising a main valve seat and a pilot valve seat, wherein a first feedback pipe is installed through the outer wall of the main valve seat, a second feedback pipe is installed through the outer wall of the pilot valve seat, a flow regulating valve is installed at one end of the first feedback pipe, a pressure relief mechanism is threaded through the outer wall of the main valve seat, and the other end of the second feedback pipe is fixed to the other end of the flow regulating valve.

[0006] Preferably, a pilot valve spring is installed inside the pilot valve seat, a second rod is slidably installed inside the pilot valve seat, a pilot valve disc is installed at the lower end of the second rod, a second circular plate is installed at the upper end of the second rod, and the main valve seat is located on one side of the pilot valve seat.

[0007] Preferably, the upper end of the second circular plate is fixed to the lower end of the pilot valve spring, and the lower end of the pilot valve disc is in contact with the lower inner end of the pilot valve seat.

[0008] Preferably, a sealing ring is installed at the lower end of the second circular plate, and a sealing groove is provided at the bottom of the inner side of the guide valve seat, with the sealing ring disposed inside the sealing groove.

[0009] Preferably, a main valve spring is installed inside the main valve seat, a main valve disc is provided in the internal opening of the main valve seat, a rod is slidably installed inside the main valve seat, and a circular plate is installed at the upper end of the rod.

[0010] Preferably, the upper end of the first circular plate is fixed to the lower end of the main valve spring, and the lower end of the first rod is fixed to the upper end of the main valve disc.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0012] 1. In this utility model, the pressure feedback is precise and controllable: the series design of the first feedback pipe, the flow regulating valve and the second feedback pipe can accurately control the pressure change rate of the main valve seat by adjusting the opening of the flow regulating valve, so as to realize the dynamic adjustment of the opening speed of the main valve and adapt to the pressure relief requirements of different systems.

[0013] 2. In this utility model, reliability is enhanced by multi-stage sealing: the pilot valve seat has a three-stage sealing structure of "pilot valve disc + sealing ring + sealing groove", which significantly reduces the risk of pilot valve leakage compared with the traditional single sealing form, and is especially suitable for high-pressure steam or corrosive media environments.

[0014] 3. In this utility model, the modular design facilitates maintenance: the pressure relief mechanism adopts a threaded connection, and the pilot valve assembly and the main valve assembly are assembled independently, allowing for individual disassembly and replacement of vulnerable parts, thereby reducing maintenance costs and downtime. Attached Figure Description

[0015] Figure 1 A three-dimensional structural diagram of a fast-response impulse safety valve is provided for this utility model;

[0016] Figure 2 A front view of the fast-response impulse safety valve is provided for this utility model.

[0017] Figure 3 This utility model provides a schematic diagram of the half-section structure of the pilot valve seat of a fast-response impulse safety valve.

[0018] Figure 4 This invention presents an exploded view of the pilot valve seat portion of a fast-response impulse safety valve.

[0019] Legend: 1. Main valve seat; 2. Feedback pipe No. 1; 3. Pilot valve seat; 4. Feedback pipe No. 2; 5. Flow regulating valve; 6. Pressure relief mechanism; 7. Main valve spring; 8. Main valve disc; 9. Rod No. 1; 10. Circular plate No. 1; 11. Pilot valve spring; 12. Rod No. 2; 13. Pilot valve disc; 14. Sealing ring; 15. Circular plate No. 2; 16. Sealing groove. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0022] Example 1: As Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this utility model provides a fast-response impulse safety valve, including a main valve seat 1 and a pilot valve seat 3. A first feedback pipe 2 is installed through the outer wall of the main valve seat 1, and a second feedback pipe 4 is installed through the outer wall of the pilot valve seat 3. A flow regulating valve 5 is installed at one end of the first feedback pipe 2, and a pressure relief mechanism 6 is threaded through the outer wall of the main valve seat 1. The other end of the second feedback pipe 4 is fixed to the other end of the flow regulating valve 5. A pilot valve spring 11 is installed inside the pilot valve seat 3, and a second rod 12 is slidably installed inside the pilot valve seat 3. A pilot valve disc 13 is installed at the lower end of the second rod 12, and a second circular plate 15 is installed at the upper end of the second rod 12. The main valve seat 1 is located on one side of the pilot valve seat 3, and the upper end of the second circular plate 15 is fixed to the lower end of the pilot valve spring 11. The lower end of the pilot valve disc 13 is in contact with the lower end of the interior of the pilot valve seat 3.

[0023] The main valve seat 1 is equipped with a main valve spring 7 inside. The main valve seat 1 has an opening for a main valve disc 8 inside. A rod 9 is slidably installed inside the main valve seat 1. A circular plate 10 is installed at the upper end of the rod 9. The upper end of the circular plate 10 is fixed to the lower end of the main valve spring 7. The lower end of the rod 9 is fixed to the upper end of the main valve disc 8.

[0024] The specific settings and functions of this embodiment are described in detail below. The main valve seat 1 and the pilot valve seat 3 are independent cavity structures. The main valve seat 1 is located on one side of the pilot valve seat 3. The two form a pressure feedback path through the first feedback pipe 2, the flow regulating valve 5 and the second feedback pipe 4 connected in series. The first feedback pipe 2 penetrates the outer wall of the main valve seat 1 and communicates with the internal cavity. Its end is connected to the flow regulating valve 5 (which adopts a needle valve structure and can accurately control the medium flow) through a thread. One end of the second feedback pipe 4 penetrates the outer wall of the pilot valve seat 3, and the other end is welded and fixed to the outlet end of the flow regulating valve 5, so as to realize the medium transmission from the pilot valve seat 3 to the main valve seat 1.

[0025] The pilot valve seat 3 is a cylindrical cavity structure. The pilot valve spring 11 is vertically installed inside. The top of the pilot valve spring 11 is fixed to the inner wall of the upper cover of the pilot valve seat 3, and the bottom is connected to the second circular plate 15. The second rod 12 is vertically fixed to the center of the lower surface of the second circular plate 15. The lower end of the second rod 12 is installed with the pilot valve disc 13. The pilot valve disc 13 contacts and cooperates with the sealing surface at the bottom of the pilot valve seat 3. This is a key sealing structure.

[0026] The main valve spring 7 is vertically installed inside the main valve seat 1. The bottom end of the main valve spring 7 is connected to the first circular plate 10. The first rod 9 is vertically fixed at the center of the lower surface of the first circular plate 10. The lower end of the first rod 9 is connected to the center of the upper surface of the main valve disc 8. The main valve disc 8 and the valve port inside the main valve seat 1 form a sealing fit. The pressure relief mechanism 6 is installed through the side wall of the main valve seat 1 (fixed by threaded connection, which is convenient for disassembly and maintenance). The inlet of the pressure relief mechanism 6 is connected to the internal cavity of the main valve seat 1, and the outlet is connected to the external pressure relief pipeline.

[0027] When the system pressure is normal, the pilot valve spring 11 pushes the pilot valve disc 13 to press tightly against the bottom sealing surface of the pilot valve seat 3 through the second circular plate 15 and the second rod 12. At the same time, the sealing ring 14 is embedded in the sealing groove 16, and the pilot valve is in a double sealing state. The main valve spring 7 pushes the main valve disc 8 to close the main valve port through the first circular plate 10 and the first rod 9. The internal pressure of the main valve seat 1 is balanced, and the safety valve is closed as a whole.

[0028] Example 2: Figure 1 and Figure 4 As shown, a sealing ring 14 is installed at the lower end of the second circular plate 15, and a sealing groove 16 is opened at the bottom of the inner side of the pilot valve seat 3, with the sealing ring 14 disposed inside the sealing groove 16.

[0029] The overall effect of this embodiment is that a sealing ring 14 (made of fluororubber) is installed around the lower edge of the second circular plate 15, and an annular sealing groove 16 is opened at the corresponding position inside the bottom of the pilot valve seat 3. The sealing ring 14 is embedded in the sealing groove 16 to form a secondary seal, which enhances the sealing performance when the pilot valve is closed.

[0030] The operating method and working principle of this device are as follows: When the system pressure exceeds the set threshold, the medium pressure overcomes the elastic force of the pilot valve spring 11, pushing the pilot valve disc 13 to move upward. The pilot valve disc 13 drives the second circular plate 15 to move upward synchronously through the second rod 12. The pilot valve spring 11 is compressed, the sealing ring 14 is disengaged from the sealing groove 16, the pilot valve opens, and some medium flows out from the pilot valve seat 3, passing through the second feedback pipe 4, the flow regulating valve 5 and the first feedback pipe 2 in sequence into the upper cavity of the main valve seat 1. As the medium rushes in, the pressure in the upper cavity of the main valve seat 1 changes (it may rise or fall suddenly depending on the structural design), breaking the pressure balance on the upper and lower sides of the main valve disc 8. When the medium pressure below the main valve disc 8 is sufficient to overcome the elastic force of the main valve spring 7, the main valve disc 8 moves upward, the main valve port is opened, and a large amount of medium is discharged through the pressure relief mechanism 6 on the side wall of the main valve seat 1, thereby quickly reducing the system pressure and avoiding damage to the system due to overpressure.

[0031] When the system pressure drops to the safety set value, the elastic force of the pilot valve spring 11 regains dominance, pushing the second circular plate 15 downward. This, in turn, drives the pilot valve disc 13 to reset via the second rod 12. The pilot valve disc 13 then comes into close contact with the sealing surface at the bottom of the pilot valve seat 3 again, and the sealing ring 14 re-embeds into the sealing groove 16. The pilot valve closes, cutting off the flow of the medium from the pilot valve seat 3 to the main valve seat 1. As the pressure exchange between the upper cavity of the main valve seat 1 and the system gradually balances, the elastic force of the main valve spring 7 pushes the first circular plate 10 and the first rod 9 downward, causing the main valve disc 8 to reset and re-seal with the valve port inside the main valve seat 1. The main valve closes, and the safety valve system returns to its initial closed state, awaiting the response to the next pressure anomaly.

[0032] The above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from the technical solution of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A fast-response impulse safety valve, comprising a main valve seat (1) and a pilot valve seat (3), characterized in that: The outer wall of the main valve seat (1) is through-installed with a first feedback pipe (2), the outer wall of the pilot valve seat (3) is through-installed with a second feedback pipe (4), one end of the first feedback pipe (2) is installed with a flow regulating valve (5), the outer wall of the main valve seat (1) is through-threaded with a pressure relief mechanism (6), and the other end of the second feedback pipe (4) is fixed to the other end of the flow regulating valve (5).

2. The fast-response impulse safety valve according to claim 1, characterized in that: The pilot valve seat (3) is equipped with a pilot valve spring (11), and a second rod (12) is slidably installed inside the pilot valve seat (3). A pilot valve disc (13) is installed at the lower end of the second rod (12), and a second circular plate (15) is installed at the upper end of the second rod (12). The main valve seat (1) is located on one side of the pilot valve seat (3).

3. A fast-response impulse safety valve according to claim 2, characterized in that: The upper end of the second circular plate (15) is fixed to the lower end of the pilot valve spring (11), and the lower end of the pilot valve disc (13) is in contact with the lower inner end of the pilot valve seat (3).

4. A fast-response impulse safety valve according to claim 2, characterized in that: A sealing ring (14) is installed at the lower end of the second circular plate (15), and a sealing groove (16) is opened at the bottom of the inner side of the guide valve seat (3). The sealing ring (14) is located inside the sealing groove (16).

5. A fast-response impulse safety valve according to claim 1, characterized in that: The main valve seat (1) is equipped with a main valve spring (7), and the main valve seat (1) has a main valve disc (8) in its internal opening. A rod (9) is slidably installed inside the main valve seat (1), and a circular plate (10) is installed at the upper end of the rod (9).

6. A fast-response impulse safety valve according to claim 5, characterized in that: The upper end of the first circular plate (10) is fixed to the lower end of the main valve spring (7), and the lower end of the first rod (9) is fixed to the upper end of the main valve disc (8).

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