Two-way discharge high-temperature and high-pressure spring type safety valve

Abstract

The invention relates to a two-way discharge high-temperature and high-pressure spring type safety valve, which belongs to the technical field of valves, and comprises a valve body, a valve seat, a valve clack, a guide sleeve, a valve cover and a spring pressure setting device, the valve body is provided with a left channel and a right channel, and a switching valve is arranged between the left channel and the right channel. Medium pressure pushes the switching valve clack to move rightwards to be in sealing fit with the right valve seat, a valve seat runner hole is communicated with the left channel, and a valve seat outlet cavity is communicated with the right channel through a right one-way valve to form a discharging channel. On the contrary, when the medium pressure of the right channel is larger than that of the left channel, the medium pushes the switching valve clack to move leftwards to be in sealing fit with the left valve seat, the valve seat runner hole is communicated with the right channel, and the valve seat outlet cavity is communicated with the left channel through the left one-way valve to form a discharging channel, so that the two-way discharging function is achieved, and the installation number of safety valves is reduced; and the equipment installation cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to a safety valve, in particular to a high-temperature and high-pressure spring safety valve. BACKGROUND

[0002] The structure of the spring safety valve generally comprises a valve body, a valve seat, a valve clapper, a guide sleeve, a valve cover and a spring pressure setting device, the center of the upper end surface of the valve clapper is in contact with the top rod of the spring pressure setting device, when the inlet medium pressure of the valve body exceeds the setting pressure value of the spring pressure setting device, the medium pressure pushes the valve clapper to open, discharges the inlet pressure of the valve body to the outlet, prevents the system from overpressure, and protects the safety of the system equipment, in order to prevent the medium from affecting the environment or resource loss, the outlet of the valve body is generally connected with the outlet pipeline. However, in some special working conditions, the outlet pipeline pressure is higher than the inlet pipeline, which requires the installation of another safety valve on the outlet pipeline to prevent the abnormal high pressure of the outlet pipeline from causing safety accidents, and increases the number and cost of equipment installation. SUMMARY

[0003] The present application provides a bidirectional discharge high-temperature and high-pressure spring safety valve which can control the inlet pipeline and outlet pipeline pressure at the same time, greatly reduces the number and cost of equipment use.

[0004] The technical scheme of the present application is as follows: A bidirectional discharge high-temperature and high-pressure spring safety valve, comprising a valve body, a valve seat, a valve clapper, a guide sleeve, a valve cover and a spring pressure setting device, the guide sleeve is fixedly installed between the upper end surface of the valve body and the lower end surface of the valve cover by the upper radial annular shoulder, the valve clapper has a sealing surface matched with the valve seat, and the outer cylindrical surface is dynamically matched with the inner hole of the guide sleeve, the spring pressure setting device is arranged in the inner cavity of the valve cover, and the structure of the spring pressure setting device comprises a spring, a valve rod and an adjusting sleeve, the spring is installed on the outer periphery of the valve rod through a lower spring seat and an upper spring seat, the adjusting sleeve is threadedly installed on the upper end of the valve cover, the lower end of the adjusting sleeve is pressed on the upper end surface of the upper spring seat, and the lower end of the valve rod is pressed on the center of the upper end surface of the valve clapper; characterized in that: the valve body has a left channel and a right channel, a switching valve is arranged between the left channel and the right channel, the switching valve comprises a left valve seat and a right valve seat arranged in the left channel and the right channel respectively, and a switching valve clapper arranged in the switching channel between the left valve seat and the right valve seat, the switching valve clapper is dynamically matched with the inner wall of the switching channel, the two end surfaces of the switching valve clapper are respectively provided with sealing surfaces matched with the left valve seat and the right valve seat, and the valve seat flow channel hole and the switching channel form a three-way structure; the outlet cavity of the valve seat is communicated with the left channel and the right channel through a left one-way valve and a right one-way valve respectively.

[0005] The preferred embodiment is that the left one-way valve consists of a left one-way valve seat, a left one-way valve disc, and a left return spring disposed within the left discharge chamber. The left one-way valve seat is positioned between the valve seat outlet and the left discharge chamber. The left one-way valve disc is disposed within the left discharge chamber, with its right end face having a sealing surface that mates with the left end face of the left one-way valve seat. Its outer circumferential surface engages with guide ribs evenly distributed circumferentially on the inner wall of the left discharge chamber. The two ends of the left return spring are installed between the left end face of the left one-way valve disc and the left wall of the left discharge chamber. The left end of the left discharge chamber is connected to the left channel. The right one-way valve is composed of a right one-way valve seat, a right one-way valve disc, and a right return spring, all located within the right discharge chamber. The right one-way valve seat is positioned between the valve seat outlet and the right discharge chamber. The right one-way valve disc is positioned within the right discharge chamber, with its left end face having a sealing surface that mates with the right end face of the right one-way valve seat. Its outer circular surface mates with guide ribs evenly distributed circumferentially on the inner wall of the right discharge chamber. The two ends of the right return spring are installed between the right end face of the right one-way valve disc and the right wall of the right discharge chamber. The right end of the right discharge chamber is connected to the right channel.

[0006] The preferred embodiment is that the left valve seat is composed of a radial annular shoulder set in the left channel, and a sealing surface that mates with the left end face of the switching valve disc is set in the right annular surface of the radial annular shoulder; the right valve seat is composed of a metal ring installed in the right channel by threads, and a sealing ring is set between the outer surface of the metal ring and the inner wall of the right channel, and the left end face of the metal ring is provided with a sealing surface that mates with the right end face of the switching valve disc.

[0007] The advantages of this invention compared to existing technologies are as follows: The valve body has a left channel and a right channel, and a switching valve is set between the left and right channels. When the medium pressure in the left channel is greater than that in the right channel, the medium pressure pushes the switching valve disc to the right to seal with the right valve seat. The valve seat flow channel hole communicates with the left channel, and the valve seat outlet cavity communicates with the right channel through the right one-way valve to form a discharge channel. Conversely, when the medium pressure in the right channel is greater than that in the left channel, the medium pushes the switching valve disc to the left to seal with the left valve seat. The valve seat flow channel hole communicates with the right channel, and the valve seat outlet cavity communicates with the left channel through the left one-way valve to form a discharge channel. This achieves bidirectional discharge function, reduces the number of safety valves required, and lowers equipment installation costs. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the present invention.

[0009] In the diagram: 1 Valve body, 2 Left channel, 3 Left discharge channel, 4 Valve seat, 5 Valve disc, 6 Left plug, 7 Left return spring, 8 Left discharge chamber, 9 Left guide rib, 10 Left one-way valve disc, 11 One-way valve seat, 12 Spring, 13 Valve stem, 14 Adjusting screw sleeve, 15 Valve cover, 16 Guide sleeve, 17 Valve seat outlet, 18 Right one-way valve seat, 19 Right one-way valve disc, 20 Right guide rib, 21 Right discharge chamber, 22 Right return spring, 23 Right plug, 24 Right discharge channel, 25 Right channel, 26 Sealing ring, 27 Right valve seat, 28 Switching channel, 29 Valve seat flow channel hole, 30 Switching valve disc, 31 Left valve seat. Detailed Implementation

[0010] like Figure 1 The bidirectional high-temperature and high-pressure spring-loaded safety valve shown includes a valve body 1, a valve seat 4, a valve disc 5, a guide sleeve 16, a valve cover 15, and a spring pressure setting device. The guide sleeve 16 is fixedly installed between the upper end face of the valve body 1 cavity and the lower end face of the valve cover 15 by an upper radial annular shoulder. The valve disc 5 has a sealing surface that cooperates with the valve seat 4, and its outer circular surface is dynamically fitted with the inner hole of the guide sleeve 16. The spring pressure setting device is located in the inner cavity of the valve cover 15, and its structure includes a spring 12, a valve stem 13, and an adjusting screw sleeve 14. The spring 12 passes through a lower spring seat. The upper spring seat is installed on the outer periphery of the valve stem 13, and the adjusting screw sleeve 14 is threaded onto the upper end of the valve cover 15, with its lower end pressing against the upper end face of the upper spring seat. The lower end of the valve stem 13 presses against the center of the upper end face of the valve disc 5. By adjusting the adjusting screw sleeve 14, the compression force of the spring 12 is adjusted, and the set pressure value is set. Its characteristic is that the valve body 1 has a left channel 2 and a right channel 25, and a switching valve is provided between the left channel 2 and the right channel 25. The switching valve consists of a left valve seat 31 and a right valve seat 27 respectively disposed in the left channel 2 and the right channel 25, and a mounting... The switching valve disc 30 is formed within the switching channel 28 between the left valve seat 31 and the right valve seat 27. The switching valve disc 30 is dynamically fitted with the inner wall of the switching channel 28, and its two end faces are respectively provided with sealing surfaces that cooperate with the left valve seat 31 and the right valve seat 27. The valve seat flow channel hole 29 and the switching channel 28 form a three-way structure. When the switching valve disc 30 moves to the right and seals with the right valve seat 27, the valve seat flow channel hole 29 communicates with the left channel 2 through the left end of the switching channel 28. When the switching valve disc 30 moves to the left and seals with the left valve seat 31, the valve seat flow channel hole 29 communicates with the left channel 2. The right end of the switching channel 28 is connected to the right channel 25; the valve seat outlet cavity 17 is connected to the left channel 2 and the right channel 25 through the left check valve and the right check valve respectively. When the left channel 2 is connected to the valve seat flow channel hole 29, the valve seat outlet cavity 17 is connected to the right channel 25 through the right check valve to form a discharge channel. When the right channel 25 is connected to the valve seat flow channel hole 29, the valve seat outlet cavity 17 is connected to the left channel 2 through the left check valve to form a discharge channel, realizing the bidirectional discharge function and solving the problem that the existing technology requires a separate safety valve to be installed on the outlet pipeline.

[0011] The left one-way valve consists of a left one-way valve seat 11, a left one-way valve disc 10, and a left return spring 7, all housed within the left discharge chamber 8. The left one-way valve seat 11 is positioned between the valve seat outlet 17 and the left discharge chamber 8. The left one-way valve disc 10 is positioned within the left discharge chamber 8, with its right end face having a sealing surface that mates with the left end face of the left one-way valve seat 11. Its outer circular surface engages with the left guide ribs 9, which are evenly distributed circumferentially along the inner wall of the left discharge chamber 8, allowing the left one-way valve disc 10 to move axially along the inner circle formed by the left guide ribs 9. The two ends of the left return spring 7 are mounted on the left end face of the left one-way valve disc 10 and the left wall of the left discharge chamber 8. Between them, the left end of the left discharge chamber 8 is connected to the left channel 2 via the left discharge channel 3. When the pressure in the right channel 25 is greater than the pressure in the left channel 2, the medium pressure in the right channel 25 pushes the switching valve disc 30 to move to the left and seal with the left valve seat 31. The right channel 25 is connected to the valve seat flow channel hole 29. When the medium pressure in the right channel 25 exceeds the set pressure value, the medium pressure overcomes the spring 12 and pushes the valve disc 5 to open. The medium enters the valve seat outlet cavity 17 and pushes the left one-way valve disc 10 to the left. The medium enters the left discharge chamber 8 from the flow groove between the adjacent left guide ribs 9, and then is discharged into the left channel 2 through the left discharge channel 3. The right one-way valve disc 30 is connected to the left channel 2 via the left discharge channel 3. The valve comprises a right one-way valve seat 18, a right one-way valve disc 19, and a right return spring 22, all housed within the right discharge chamber 21. The right one-way valve seat 18 is positioned between the valve seat outlet 17 and the right discharge chamber 21. The right one-way valve disc 19 is positioned within the right discharge chamber 21, with its left end face having a sealing surface that mates with the right end face of the right one-way valve seat 18. Its outer circumferential surface engages with right guide ribs 20, which are evenly distributed circumferentially along the inner wall of the right discharge chamber 21, allowing it to move axially along the inner circle formed by the right guide ribs 20. The two ends of the right return spring 22 are mounted between the right end face of the right one-way valve disc 19 and the right wall of the right discharge chamber 21. The right end of the right discharge chamber 21 is connected to the right channel 25 via the right discharge channel 24. When the pressure in the left channel 2 is greater than the pressure in the right channel 25, the medium pressure in the left channel 2 pushes the switching valve disc 30 to move to the right and seal with the right valve seat 27. The left channel 2 is connected to the valve seat flow channel hole 29. When the medium pressure in the left channel 2 exceeds the set pressure value, the medium pressure overcomes the spring 12 and pushes the valve disc 5 to open. The medium enters the valve seat outlet cavity 17 and pushes the right one-way valve disc 19 to move to the right. The medium enters the right discharge chamber 21 from the flow groove between the adjacent right guide ribs 20, and then is discharged into the left channel 25 through the connecting right discharge channel 24. The left one-way valve seat 11, the right one-way valve seat 18, the left discharge chamber 8, the right discharge chamber 21, the left discharge channel 3, and the right discharge channel 24 are integrally formed on the valve body 1. The left cavity wall of the left discharge chamber 8 is formed by the left plug 6 sealed and installed at the left end of the left discharge chamber 8. The right cavity wall of the right discharge chamber 21 is formed by the right plug 23 sealed and installed at the right end of the right discharge chamber 21.

[0012] The left valve seat 31 is composed of a radial annular shoulder machined in the left channel 2. A sealing surface that mates with the left end face of the switching valve disc 30 is provided in the right annular surface of the radial annular shoulder. The left end of the radial annular shoulder is connected to the left channel 2 with a conical surface to reduce fluid resistance. The right valve seat 27 is composed of a metal ring installed in the right channel 25 by threads. The metal ring is installed in the right channel 25 from the right end, which facilitates the machining of the sealing surface of the left valve seat 31 from the right side. A sealing ring 26 is provided between the outer surface of the metal ring and the inner wall of the right channel 25. The left end face of the metal ring is provided with a sealing surface that mates with the right end face of the switching valve disc 30.

[0013] In this invention, directional terms such as "up," "down," "left," and "right" refer to the directions shown in the accompanying drawings for ease of description and should not be construed as limiting the scope of the invention.

Claims

1. A bidirectional discharge high-temperature and high-pressure spring-loaded safety valve, comprising a valve body (1), a valve seat (4), a valve disc (5), a guide sleeve (16), a valve cover (15), and a spring pressure setting device, wherein the guide sleeve (16) is fixedly installed between the upper end face of the cavity of the valve body (1) and the lower end face of the valve cover (15) by an upper radial annular shoulder, and the valve disc (5) has a sealing surface that cooperates with the valve seat (4), and its outer circular surface is dynamically engaged with the inner hole of the guide sleeve (16); characterized in that: The valve body (1) has a left channel (2) and a right channel (25). A switching valve is provided between the left channel (2) and the right channel (25). The switching valve consists of a left valve seat (31) and a right valve seat (27) respectively provided in the left channel (2) and the right channel (25), and a switching valve disc (30) installed in the switching channel (28) between the left valve seat (31) and the right valve seat (27). The switching valve disc (30) is dynamically fitted with the inner wall of the switching channel (28). Its two end faces are respectively provided with sealing surfaces that cooperate with the left valve seat (31) and the right valve seat (27). The valve seat flow channel hole (29) and the switching channel (28) form a three-way structure. The valve seat outlet cavity (17) is connected to the left channel (2) and the right channel (25) through the left one-way valve and the right one-way valve respectively.

2. The bidirectional high-temperature and high-pressure spring-loaded safety valve according to claim 1, characterized in that: The left one-way valve is composed of a left one-way valve seat (11), a left one-way valve disc (10), and a left return spring (7) arranged in the left discharge chamber (8). The left one-way valve seat (11) is arranged between the valve seat outlet (17) and the left discharge chamber (8). The left one-way valve disc (10) is arranged in the left discharge chamber (8). Its right end face has a sealing surface that cooperates with the left end face of the left one-way valve seat (11). The outer circular surface is in dynamic cooperation with the left guide ribs (9) that are evenly arranged in the circumferential direction of the inner wall of the left discharge chamber (8). The two ends of the left return spring (7) are installed between the left end face of the left one-way valve disc (10) and the left cavity wall of the left discharge chamber (8). The left end of the left discharge chamber (8) is connected to the left channel (2) through the left discharge channel (3). The right one-way valve... The valve is composed of a right one-way valve seat (18), a right one-way valve disc (19), and a right return spring (22) set in the right discharge chamber (21). The right one-way valve seat (18) is set between the valve seat outlet mouth (17) and the right discharge chamber (21). The right one-way valve disc (19) is set in the right discharge chamber (21). Its left end face has a sealing surface that cooperates with the right end face of the right one-way valve seat (18). The outer circular surface is in dynamic cooperation with the right guide ribs (20) that are evenly arranged in the circumferential direction of the inner wall of the right discharge chamber (21). The two ends of the right return spring (22) are installed between the right end face of the right one-way valve disc (19) and the right cavity wall of the right discharge chamber (21). The right end of the right discharge chamber (21) is connected to the right channel (25) through the right discharge channel (24).

3. The bidirectional discharge high-temperature and high-pressure spring-loaded safety valve according to claim 1 or 2, characterized in that: The left valve seat (31) is formed by machining a radial annular shoulder in the left channel (2), and a sealing surface that cooperates with the left end face of the switching valve disc (30) is provided in the right annular surface of the radial annular shoulder; the right valve seat (27) is formed by installing a metal ring in the right channel (25) by thread; a sealing ring (26) is provided between the outer surface of the metal ring and the inner wall of the right channel (25), and a sealing surface that cooperates with the right end face of the switching valve disc (30) is provided in the left end face of the metal ring.

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