Hard sealed marine full lift seal safety valve

Abstract

The application discloses a hard sealing marine full-opening closed safety valve, and relates to the technical field of valves.The safety valve comprises a valve body, a valve seat, a valve clack, a guide seat, a valve rod, an elastic assembly and an adjusting assembly.The valve seat is tightly connected with the valve body, the valve clack is abutted with the valve seat, the guide seat is tightly connected with the valve body, the valve rod is tightly connected with the valve clack, the valve rod is slidingly connected with the guide seat, the elastic assembly is sleeved on the valve rod, the elastic assembly is used for providing pressure for the valve clack, the adjusting assembly is tightly connected with the valve body, and the adjusting assembly is used for compensating the elastic force of the elastic assembly.When the pressure in the system is in a normal range, the valve clack of the safety valve is tightly pressed on the valve seat by the elastic assembly;when the pressure in the system exceeds the set value of the safety valve, the force of the medium acting on the valve clack of the safety valve is increased, the pre-tightening force of the elastic assembly is overcome, the valve clack and the valve rod are pushed to move upward, the medium flows out from the gap between the valve clack and the valve seat, and the pressure is reduced to the safety range.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a hard sealing full-opening closed safety valve for ships. BACKGROUND

[0002] The safety valve for ships is a safety device specially designed for ships, mainly used for protecting pressure vessels, pipelines and the like in the ship system from the influence of excessive pressure. When the pressure in the vessel or pipeline is too high, the safety valve will automatically open to quickly release the pressure and avoid damage to the equipment or danger.

[0003] Under normal working pressure, the spring force of the spring sleeved on the valve stem makes the valve disc tightly press against the valve seat, and the valve is in a closed state. When the system pressure exceeds the set value, the force acting on the valve disc exceeds the spring force, the valve disc is pushed open, and the medium is discharged through the valve. With the release of pressure, the valve disc is closed again under the action of the spring, and the valve returns to the closed state.

[0004] However, the spring is usually made of metal, and over time, the crystal lattice structure in the metal will change, causing the elastic properties of the material to decrease, which requires a certain compensation for the lost spring force. In addition, the existing safety valve opens the valve disc to release pressure when the system pressure exceeds the set value, and cannot automatically control the flow of pressure relief according to the amount of pressure exceeded, thereby causing the valve disc to open frequently and easily aggravating the wear of the valve. SUMMARY

[0005] The purpose of the present application is to provide a hard sealing full-opening closed safety valve for ships to solve the problems in the prior art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: the present application provides a hard sealing full-opening closed safety valve for ships, which comprises a valve body, a valve seat, a valve disc, a guide seat, a valve stem, an elastic assembly and an adjusting assembly. The valve seat is tightly connected with the valve body, the valve disc is in abutment with the valve seat, the guide seat is tightly connected with the valve body, the valve stem is tightly connected with the valve disc, the valve stem is slidingly connected with the guide seat, the elastic assembly is sleeved on the valve stem, the elastic assembly is used for providing pressure for the valve disc, the adjusting assembly is tightly connected with the valve body, and the adjusting assembly is used for compensating the spring force of the elastic assembly.

[0007] When the pressure in the system is in the normal range, the valve disc of the safety valve is pressed against the valve seat by the elastic assembly, at this time, the valve is sealed, preventing the medium from flowing out; when the pressure in the system exceeds the set value of the safety valve, the force of the medium acting on the valve disc of the safety valve increases, overcoming the pre-tightening force of the elastic assembly, the guide seat is used to provide guidance for the movement of the valve rod, pushing the valve disc and the valve rod to move upward, the medium flows out from the gap opened between the valve disc and the valve seat, until the pressure decreases to the safety range, when the pressure recovers below the safety value, the safety valve will automatically close; in addition, when the elastic assembly decreases in elasticity during long-term use, the lost elastic force of the elastic assembly is compensated by the adjusting assembly.

[0008] Further, the valve body is provided with a connecting port, a pressure relief port and a shield, and the adjusting assembly is located in the shield.

[0009] The connecting port is used to connect to the corresponding system, the pressure relief port is used to discharge excess medium, and the shield is used to protect the adjusting assembly.

[0010] Further, the elastic assembly includes an upper seat, a supporting spring and a lower seat, the upper seat is in sliding connection with the valve rod, the upper seat is in abutment with the adjusting assembly, the lower seat is in fastening connection with the valve rod, one end of the supporting spring is in abutment with the upper seat, and the other end of the supporting spring is in abutment with the lower seat.

[0011] When the system is over-pressurized, the increased pressure will push the valve disc to move upward, thereby driving the valve rod to move upward along the guide seat, the upward moving valve rod will drive the lower seat fixedly connected thereto to move upward, thereby compressing the supporting spring, the position of the upper seat is controlled by the adjusting assembly, thereby controlling the pre-tightening force of the supporting spring in a suitable interval; when the system pressure returns to normal, the valve rod will move downward under the action of the elastic force of the supporting spring, thereby pressing the valve disc against the valve seat.

[0012] Further, the adjusting assembly includes a movable sleeve, a driving motor and a transmission gear, the movable sleeve is in sliding connection with the valve rod, the bottom end of the movable sleeve is in abutment with the upper seat, the driving motor is in fastening connection with the inner wall of the shield, the output end of the driving motor is in transmission connection with the transmission gear, and the transmission gear is in transmission connection with the movable sleeve.

[0013] The driving motor is the main power source of the adjusting assembly, the driving motor outputs torque, thereby driving the transmission gear to rotate, and further transmitting power to the movable sleeve, so that the movable sleeve moves freely along the valve rod, thereby controlling the position of the upper seat; the longer the distance of the downward movement of the movable sleeve, the longer the distance of the downward movement of the upper seat, the longer the supporting spring is compressed, and the greater the pre-tightening force; that is, when the elastic performance of the supporting spring decreases, the distance of the movable sleeve is adjusted, thereby automatically compensating for the loss of the elastic force of the supporting spring during long-term use, so as to maintain the pre-tightening force in a suitable interval.

[0014] Further, the movable sleeve is provided with a tooth surface and an external thread, the valve body is provided with an internal thread on a through hole near one end of the movable sleeve, the external thread is engaged with the internal thread, and the tooth surface is engaged with a transmission gear.

[0015] The tooth surface is used to transmit power of the transmission gear to the movable sleeve, and the external thread and the internal thread on the valve body are matched with each other to drive the movable sleeve to move up and down, the tooth surface has a certain width to ensure that the tooth surface is always engaged with the transmission gear during adjustment.

[0016] Further, the movable sleeve is provided with a detection cavity, the movable sleeve is provided with an elastic ring near one end of the upper seat, the inner cavity of the elastic ring is filled with hydraulic oil, the elastic ring is communicated with the detection cavity, the adjusting assembly further comprises a piston, a magnetic bar and a coil, the piston is slidably connected with the detection cavity, the magnetic bar is fixedly connected with the piston, and the coil is arranged on the periphery of the detection cavity and connected with a detection power supply.

[0017] During detection, the magnetic bar moves relative to the coil.

[0018] The support spring exerts a force on the upper seat to press the upper seat against the bottom end of the movable sleeve, thereby exerting a certain pressure on the elastic ring, so that the elastic ring is compressed under stress, the hydraulic oil in the elastic ring is pressed into the detection cavity, thereby keeping the piston at a certain height in the detection cavity, and the magnetic bar is inserted into the coil at this time; the detection of the elastic force of the support spring is only performed when the valve is closed, when the elastic force of the support spring decays after long-term use, the pressure of the upper seat on the elastic ring decreases, the deformation amount of the elastic ring decreases, and the amount of hydraulic oil pressed into the detection cavity decreases, so that the piston moves downward by a distance, thereby driving the magnetic bar to move downward by a distance, so that the magnetic bar moves relative to the coil to cut the magnetic induction lines, thereby generating an induced current, and the coil is connected with the detection power supply, so that the induced current generated on the coil is detected by the detection power supply, thereby determining the elastic force of the decayed support spring, the greater the induced current, the greater the elastic force of the decayed support spring, and the corresponding distance of the movable sleeve driven by the driving motor is moved downward, thereby automatically compensating for the elastic force of the decayed support spring.

[0019] Further, the valve disc is provided with a movable cavity, a pressure discharge flow channel and a guide flow channel, the movable cavity is provided with a pressure relief assembly, the pressure relief assembly is used to guide pressure to the pressure discharge flow channel and the guide flow channel, the pressure discharge flow channel and the guide flow channel are arranged alternately, the outlet of the pressure discharge flow channel is communicated with the pressure relief port, and the outlet of the guide flow channel faces the valve seat.

[0020] The existing safety valve opens the valve disc to release pressure when the system pressure exceeds the set value, which causes the valve disc to open frequently and easily aggravates the wear of the valve; the pressure relief assembly is arranged on the valve disc, when the overpressure is low, the excess pressure is discharged through the pressure relief flow channel without opening the valve disc to release pressure; when the overpressure is high, the medium is guided to the flow channel through the pressure relief assembly, and the guiding flow channel has an outlet facing the valve seat, when the medium flows out from the outlet of the guiding flow channel, the backwash force formed can improve the opening speed of the valve disc, thereby improving the pressure relief efficiency.

[0021] Further, the pressure relief assembly comprises a movable block and a movable spring, the movable block is in sliding connection with the movable cavity, one end of the movable spring is in fastening connection with the movable block, and the other end of the movable spring is in fastening connection with the inner wall of the movable cavity, and the movable block is provided with an annular flow channel in communication with the connecting port;

[0022] When the overpressure is low, the annular flow channel is in communication with the pressure relief flow channel;

[0023] When the overpressure is high, the annular flow channel is in communication with the guiding flow channel.

[0024] The pre-tightening force of the supporting spring is slightly greater than the standard pressure, so that when the medium pressure exceeds the standard pressure and is less than the pre-tightening force, the pressure of the medium will push the movable block to move a short distance upward, the movable spring is compressed under stress, the annular flow channel is in communication with the pressure relief flow channel, the excess pressure is discharged through the pressure relief flow channel, at this time, small-flow pressure relief is achieved without opening the valve disc; when the medium pressure exceeds the pre-tightening force, the pressure of the medium will push the movable block to move a long distance upward, the annular flow channel is in communication with the guiding flow channel, the medium flows out from the outlet of the guiding flow channel to form a backwash force on the valve disc, thereby improving the opening speed of the valve disc, at this time, the pressure is discharged from the gap between the valve disc and the valve seat, large-flow pressure relief is achieved; that is, through the staggered arrangement of the pressure relief flow channel and the guiding flow channel, small-flow pressure relief and large-flow pressure relief are combined, thereby improving the efficiency of pressure relief and the service life of the valve.

[0025] Further, the valve seat and the valve disc are made of stainless steel.

[0026] The valve seat and the valve disc made of stainless steel have excellent corrosion resistance and are stable in high-temperature environments and are not easy to deform or fail, in addition, stainless steel has high mechanical strength and can withstand large pressure and load.

[0027] Compared with the prior art, the present application has the following advantages:

[0028] 1. By setting deformable elastic ring on the contact surface of the movable sleeve and the upper seat, when the supporting spring attenuates after long time use, the pressure of the upper seat on the elastic ring will decrease, the deformation of the elastic ring will decrease, the hydraulic oil content in the detection cavity will decrease, the piston will move down a distance, thus the magnetic rod moves down a distance, so that the magnetic rod and the coil produce relative motion, do cutting magnetic induction line motion, thus forming induced current, by detecting the size of the induced current generated on the power supply detection coil, the size of the supporting spring attenuation can be judged, then the movable sleeve is driven by the driving motor to move down a corresponding distance, so that the supporting spring attenuation can be automatically compensated.

[0029] 2. By staggered arrangement of the pressure discharge flow channel and the guide flow channel, and the corresponding pressure relief assembly, when the overpressure is low, the excess pressure is discharged through the pressure discharge flow channel, without opening the valve to relieve pressure, reducing the wear of the valve; when the overpressure is high, the medium guide flow channel is guided by the pressure relief assembly, when the medium flows out of the outlet of the guide flow channel, the backflushing force formed can improve the opening speed of the valve, thus improving the efficiency of pressure relief, thus realizing the combination of small flow pressure relief and large flow pressure relief, thus improving the efficiency of pressure relief, and improving the service life of the valve. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is the overall structure schematic diagram of the present application;

[0031] Figure 2 is the partial sectional view of the present application;

[0032] Figure 3 is the partial sectional view of the valve;

[0033] Figure 4 is the A partial enlarged view of Figure 3

[0034] Figure 5 is the schematic diagram of the adjusting assembly;

[0035] Figure 6 is the B partial enlarged view of Figure 5

[0036] Figure 7 is the partial sectional view of the movable sleeve;

[0037] Figure 8 is the C partial enlarged view of Figure 7

[0038] ​​​In the figure: 1. Valve body; 11. Connection port; 12. Pressure relief port; 13. Protective cover; 14. Internal thread; 2. Valve seat; 3. Valve disc; 31. Movable chamber; 32. Pressure relief channel; 33. Guide channel; 4. Guide seat; 5. Valve stem; 6. Elastic component; 61. Upper seat; 62. Support spring; 63. Lower seat; 7. Adjustment component; 71. Movable sleeve; 711. Tooth surface; 712. External thread; 713. Detection chamber; 72. Drive motor; 73. Transmission gear; 74. Elastic ring; 75. Piston; 76. Magnetic rod; 77. Coil; 8. Pressure relief component; 81. Movable block; 811. Annular channel; 82. Movable spring. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] Example: Figures 1-8 As shown, the present invention provides a technical solution for a hard-sealed marine full-open and closed safety valve, the safety valve comprising a valve body 1, a valve seat 2, a valve disc 3, a guide seat 4, a valve stem 5, an elastic component 6 and an adjusting component 7. The valve seat 2 is tightly connected to the valve body 1, the valve disc 3 abuts against the valve seat 2, the guide seat 4 is tightly connected to the valve body 1, the valve stem 5 is tightly connected to the valve disc 3, the valve stem 5 is slidingly connected to the guide seat 4, the elastic component 6 is sleeved on the valve stem 5, the elastic component 6 is used to provide pressure for the valve disc 3, the adjusting component 7 is tightly connected to the valve body 1, and the adjusting component 7 is used to compensate for the elastic force of the elastic component 6.

[0041] When the pressure in the system is within the normal range, the valve disc 3 of the safety valve is pressed against the valve seat 2 by the elastic component 6. At this time, the valve is sealed to prevent the medium from flowing out; when the pressure in the system exceeds the set value of the safety valve, the force of the medium acting on the valve disc 3 of the safety valve increases, overcoming the pre-tightening force of the elastic component 6. The guide seat 4 is used to provide guidance for the movement of the valve stem 5, pushing the valve disc 3 and the valve stem 5 to move upward, and the medium flows out from the gap opened between the valve disc 3 and the valve seat 2 until the pressure drops to a safe range. When the pressure returns to below the safe value, the safety valve will automatically close; in addition, when the elastic force of the elastic component 6 decreases during long-term use, the elastic force lost by the elastic component 6 is compensated by the adjusting component 7.

[0042] The valve body 1 is provided with a connecting port 11 , a pressure relief port 12 and a protective cover 13 , and the regulating assembly 7 is located inside the protective cover 13 .

[0043] The connecting port 11 is used for connecting to the corresponding system, the pressure relief port 12 is used for discharging excess medium, and the shroud 13 is used for protecting the adjusting assembly 7.

[0044] The elastic assembly 6 comprises an upper seat 61, a supporting spring 62 and a lower seat 63, the upper seat 61 is in sliding connection with the valve rod 5, the upper seat 61 is in abutment with the adjusting assembly 7, the lower seat 63 is in fastening connection with the valve rod 5, one end of the supporting spring 62 is in abutment with the upper seat 61, and the other end of the supporting spring 62 is in abutment with the lower seat 63.

[0045] When the system is over-pressured, the increased pressure will push the valve disc 3 to move upward, thereby driving the valve rod 5 to move upward along the guide seat 4, the upwardly moving valve rod 5 will drive the lower seat 63 fastened thereto to move upward, thereby compressing the supporting spring 62, and the position of the upper seat 61 is controlled by the adjusting assembly 7, so as to control the pre-tightening force of the supporting spring 62 in a suitable range; when the system pressure returns to normal, the valve rod 5 will move downward under the action of the elastic force of the supporting spring 62, thereby pressing the valve disc 3 tightly against the valve seat 2.

[0046] The adjusting assembly 7 comprises a movable sleeve 71, a driving motor 72 and a transmission gear 73, the movable sleeve 71 is in sliding connection with the valve rod 5, the bottom end of the movable sleeve 71 is in abutment with the upper seat 61, the driving motor 72 is in fastening connection with the inner wall of the shroud 13, the output end of the driving motor 72 is in transmission connection with the transmission gear 73, and the transmission gear 73 is in transmission connection with the movable sleeve 71.

[0047] The driving motor 72 is the main power source of the adjusting assembly 7, the driving motor 72 outputs torque, thereby driving the transmission gear 73 to rotate, and then transmitting power to the movable sleeve 71, so that the movable sleeve 71 moves freely along the valve rod 5, thereby controlling the position of the upper seat 61; the longer the distance of the downward movement of the movable sleeve 71, the longer the distance of the downward movement of the upper seat 61, the longer the supporting spring 62 is compressed, and the greater the pre-tightening force; that is, when the elastic performance of the supporting spring 62 decreases, the distance of the movable sleeve 71 is adjusted, so as to automatically compensate for the loss of the elastic force of the supporting spring 62 in the long-term use process, thereby keeping the pre-tightening force in a suitable range.

[0048] The movable sleeve 71 is provided with a tooth surface 711 and an external thread 712, the valve body 1 is provided with an internal thread 14 on the through hole of one end close to the movable sleeve 71, the external thread 712 is engaged with the internal thread 14, and the tooth surface 711 is engaged with the transmission gear 73.

[0049] The tooth surface 711 is used for transmitting the power of the transmission gear 73 to the movable sleeve 71, and the external thread 712 and the internal thread 14 on the valve body 1 are matched with each other, so as to drive the movable sleeve 71 to move up and down, the tooth surface 711 has a certain width, which ensures that the tooth surface 711 is always in engagement with the transmission gear 73 for transmission during adjustment.

[0050] The detection cavity 713 is arranged in the movable sleeve 71, and the movable sleeve 71 is provided with an elastic ring 74 at one end close to the upper seat 61. The inner cavity of the elastic ring 74 is filled with hydraulic oil, and the elastic ring 74 is communicated with the detection cavity 713. The adjusting assembly 7 further comprises a piston 75, a magnetic rod 76 and a coil 77. The piston 75 is slidably connected with the detection cavity 713. The magnetic rod 76 is fixedly connected with the piston 75. The coil 77 is arranged around the periphery of the detection cavity 713, and the coil 77 is connected with a detection power supply.

[0051] When detecting, the magnetic rod 76 and the coil 77 produce relative motion.

[0052] The support spring 62 exerts a force on the upper seat 61 to press the upper seat 61 against the bottom end of the movable sleeve 71, so as to exert a certain pressure on the elastic ring 74, so that the elastic ring 74 is compressed under stress, the hydraulic oil in the elastic ring 74 is pressed into the detection cavity 713, so as to keep the piston 75 at a certain height in the detection cavity 713. At this time, the magnetic rod 76 is inserted into the coil 77. The detection of the elastic force of the support spring 62 is only carried out when the valve is closed. When the elastic force of the support spring 62 is attenuated after long-term use, the pressure of the upper seat 61 on the elastic ring 74 will decrease, the deformation amount of the elastic ring 74 will decrease, and the amount of hydraulic oil pressed into the detection cavity 713 will decrease. The piston 75 will be moved downward by a distance, thereby driving the magnetic rod 76 to move downward by a distance, so that the magnetic rod 76 and the coil 77 produce relative motion, that is, cutting magnetic induction line motion, thereby forming induced current. The coil 77 is connected with the detection power supply, and the size of the induced current generated on the coil 77 is detected through the detection power supply, so as to judge the size of the attenuated elastic force of the support spring 62. The larger the induced current generated is, the larger the attenuated elastic force of the support spring is. The movable sleeve 71 is driven to move downward by a corresponding distance through the driving motor 72, so as to automatically compensate the attenuated elastic force of the support spring 62.

[0053] The valve disc 3 is provided with a movable cavity 31, a pressure discharge flow channel 32 and a guide flow channel 33. The pressure relief assembly 8 is arranged in the movable cavity 31, and the pressure relief assembly 8 is used to guide the pressure to the pressure discharge flow channel 32 and the guide flow channel 33. The pressure discharge flow channel 32 and the guide flow channel 33 are arranged alternately. The outlet of the pressure discharge flow channel 32 is communicated with the pressure relief port 12, and the outlet of the guide flow channel 33 faces the valve seat 2.

[0054] The existing safety valve opens the valve disc 3 to discharge pressure when the system pressure exceeds the set value, which causes the valve disc 3 to be frequently opened and easily aggravates the wear of the valve. The pressure relief assembly 8 is arranged on the valve disc 3, and when the overpressure is low, the excess pressure is discharged through the pressure discharge flow channel 32 without opening the valve disc 3 to discharge pressure. When the overpressure is high, the medium is guided to the guide flow channel 33 through the pressure relief assembly 8, and the guide flow channel 33 has an outlet facing the valve seat 2. When the medium flows out of the outlet of the guide flow channel 33, the back pressure formed can improve the opening speed of the valve disc 3, thereby improving the efficiency of pressure relief.

[0055] The pressure relief assembly 8 comprises a movable block 81 and a movable spring 82, the movable block 81 is in sliding connection with the movable cavity 31, one end of the movable spring 82 is in fastening connection with the movable block 81, and the other end of the movable spring 82 is in fastening connection with the inner wall of the movable cavity 31, and the movable block 81 is provided with an annular flow channel 811, which is in communication with the connecting port 11;

[0056] When the overpressure is low: the annular flow channel 811 is in communication with the pressure relief flow channel 32;

[0057] When the overpressure is high: the annular flow channel 811 is in communication with the guide flow channel 33.

[0058] The pre-tightening force of the supporting spring 62 is slightly greater than the standard pressure, so that when the medium pressure exceeds the standard pressure and is less than the pre-tightening force, the pressure of the medium will push the movable block 81 to move a short distance upward, the movable spring 82 is compressed under stress, so that the annular flow channel 811 is in communication with the pressure relief flow channel 32, and the excess pressure is discharged through the pressure relief flow channel 32, at this time, it is in small flow pressure relief, and the valve disc 3 does not need to be opened; when the medium pressure exceeds the pre-tightening force, the pressure of the medium will push the movable block 81 to move a long distance upward, so that the annular flow channel 811 is in communication with the guide flow channel 33, so that the medium flows out from the outlet of the guide flow channel 33, forming a back pressure on the valve disc 3, thereby improving the opening speed of the valve disc 3, at this time, the pressure is discharged from the gap between the valve disc 3 and the valve seat 2, and it is in large flow pressure relief; that is, through the staggered arrangement of the pressure relief flow channel 32 and the guide flow channel 33, the small flow pressure relief and the large flow pressure relief are combined, thereby improving the efficiency during pressure relief, and prolonging the service life of the valve.

[0059] The valve seat 2 and the valve disc 3 are made of stainless steel.

[0060] The valve seat 2 and the valve disc 3 made of stainless steel have excellent corrosion resistance and are stable in high temperature environment and are not easy to deform or fail, in addition, stainless steel has high mechanical strength and can withstand high pressure and load.

[0061] The working principle of the present application is as follows: when the pressure in the system is in the normal range, the valve clack 3 of the safety valve is pressed against the valve seat 2 by the elastic assembly 6, at this time, the valve is sealed and the medium is prevented from flowing out; when the supporting spring 62 is used for a long time, the elastic force decays, the pressure of the upper seat 61 on the elastic ring 74 decreases, the deformation of the elastic ring 74 decreases, the content of the hydraulic oil in the detection cavity 713 decreases, the piston 75 moves downward by a distance, thereby driving the magnetic rod 76 to move downward by a distance, so that the magnetic rod 76 and the coil 77 move relatively, cut the magnetic induction lines, thereby generating an induced current, the size of the induced current generated on the detection coil 77 is detected, the size of the elastic force of the supporting spring 62 is judged, and then the driving motor 72 drives the movable sleeve 71 to move downward by a corresponding distance, so that the elastic force of the supporting spring 62 is automatically compensated; the pre-tightening force of the supporting spring 62 is slightly greater than the standard pressure, so that when the medium pressure exceeds the standard pressure and is less than the pre-tightening force, the pressure of the medium drives the movable block 81 to move upward by a short distance, the active spring 82 is compressed under stress, so that the annular flow channel 811 is communicated with the pressure relief flow channel 32, and the excess pressure is discharged through the pressure relief flow channel 32, at this time, it is in a small flow pressure relief; when the medium pressure exceeds the pre-tightening force, the pressure of the medium drives the movable block 81 to move upward by a long distance, so that the annular flow channel 811 is communicated with the guide flow channel 33, so that the medium flows out from the outlet of the guide flow channel 33, and an anti-pulsation force is formed on the valve clack 3, thereby improving the opening speed of the valve clack 3, at this time, the pressure is discharged from the gap between the valve clack 3 and the valve seat 2, and it is in a large flow pressure relief.

[0062] It will be obvious to a person skilled in the art that, without departing from the spirit or essential characteristics of the application, the present application can be implemented in other specific forms. The present embodiments are therefore considered in all respects to be illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the description given above, and all changes coming within the meaning and equivalency range of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A hard-sealed marine full-open and closed safety valve, characterized by: The safety valve comprises a valve body (1), a valve seat (2), a valve disc (3), a guide seat (4), a valve stem (5), an elastic component (6) and an adjusting component (7), wherein the valve seat (2) is fixedly connected to the valve body (1), the valve disc (3) abuts against the valve seat (2), the guide seat (4) is fixedly connected to the valve body (1), the valve stem (5) is fixedly connected to the valve disc (3), the valve stem (5) is slidably connected to the guide seat (4), the elastic component (6) is sleeved on the valve stem (5), the elastic component (6) is used to provide pressure for the valve disc (3), the adjusting component (7) is fixedly connected to the valve body (1), and the adjusting component (7) is used to compensate for the elastic force of the elastic component (6); The valve disc (3) is provided with an active cavity (31), a pressure relief channel (32) and a guide channel (33); a pressure relief assembly (8) is provided in the active cavity (31); the pressure relief assembly (8) is used to guide pressure to the pressure relief channel (32) and the guide channel (33); the pressure relief channel (32) and the guide channel (33) are arranged in a staggered manner; the outlet of the pressure relief channel (32) is communicated with the pressure relief port (12); and the outlet of the guide channel (33) faces the valve seat (2); The pressure relief assembly (8) includes a movable block (81) and a movable spring (82), wherein the movable block (81) is slidably connected to the movable chamber (31), one end of the movable spring (82) is fixedly connected to the movable block (81), and the other end of the movable spring (82) is fixedly connected to the inner wall of the movable chamber (31), and an annular flow channel (811) is provided on the movable block (81), and the annular flow channel (811) is communicated with the connecting port (11); When the medium pressure exceeds the standard pressure but is less than the preload force of the support spring (62), the annular flow channel (811) is connected to the pressure relief flow channel (32). When the medium pressure exceeds the preload force of the support spring (62), the annular flow channel (811) is connected to the guide flow channel (33); The valve body (1) is provided with a connection port (11), a pressure relief port (12) and a protective cover (13), and the regulating assembly (7) is located inside the protective cover (13); The elastic component (6) includes an upper seat (61), a support spring (62) and a lower seat (63), wherein the upper seat (61) is slidably connected to the valve stem (5), the upper seat (61) abuts against the adjustment component (7), and the lower seat (63) is tightly connected to the valve stem (5), one end of the support spring (62) abuts against the upper seat (61), and the other end of the support spring (62) abuts against the lower seat (63); The regulating assembly (7) includes a movable sleeve (71), a driving motor (72) and a transmission gear (73), wherein the movable sleeve (71) is slidably connected to the valve stem (5), the bottom end of the movable sleeve (71) abuts against the upper seat (61), the driving motor (72) is fastened to the inner wall of the shield (13), the output end of the driving motor (72) is transmission-connected to the transmission gear (73), and the transmission gear (73) is transmission-connected to the movable sleeve (71).

2. A hard-sealed marine full-open and closed safety valve according to claim 1, characterized in that: The movable sleeve (71) is provided with a tooth surface (711) and an external thread (712); an internal thread (14) is provided on a through hole at one end of the valve body (1) close to the movable sleeve (71); the external thread (712) meshes with the internal thread (14); and the tooth surface (711) meshes with the transmission gear (73).

3. A hard-sealed marine full-open and close safety valve according to claim 2, characterized in that: A detection chamber (713) is provided in the movable sleeve (71), and an elastic ring (74) is provided at one end of the movable sleeve (71) close to the upper seat (61). The inner cavity of the elastic ring (74) is filled with hydraulic oil, and the elastic ring (74) is communicated with the detection chamber (713). The regulating assembly (7) further includes a piston (75), a magnetic rod (76) and a coil (77). The piston (75) is slidably connected to the detection chamber (713), the magnetic rod (76) is firmly connected to the piston (75), and the coil (77) is wound around the periphery of the detection chamber (713). The coil (77) is externally connected to a detection power supply. During detection, the magnetic bar (76) and the coil (77) generate relative motion.

4. A hard-sealed marine full-open and closed safety valve according to claim 1, characterized in that: The valve seat (2) and the valve flap (3) are made of stainless steel.

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