A sea valve

Abstract

The present invention discloses a sea valve, comprising: a valve body, a drive unit, and a valve cover. The valve body is open at both ends and has a sealing surface inside. One open end of the valve body is arranged to penetrate the sealing surface. A rotating shaft is rotatably supported inside the valve body. The rotating shaft is fixed to a first connecting rod, the first connecting rod is hinged to a second connecting rod, the second connecting rod is hinged to a connecting block, and the third connecting rod is hinged to the valve body and the connecting block respectively. A telescopic cylinder is connected to the valve body and the connecting block respectively. The valve cover is arranged in the valve body and connected to the rotating shaft, and the end face of the valve cover can be tightly attached to the sealing surface. The telescopic cylinder in the present invention can drive the rotating shaft to rotate, and when the rotating shaft rotates, it can drive the valve cover to press against the sealing surface, thereby realizing the opening and closing of the valve body. The sea valve has a simple and reliable structure, a small size, and can be further reduced in weight, thereby reducing the installation and maintenance costs of the sea valve. Under the premise of meeting a large diameter, the valve cover can move flexibly, and the drive unit can reliably drive the valve cover to swing, so that the sea valve can reliably realize opening and closing.

Description

Technical Field

[0001] The present invention relates to the field of sea valves, and more particularly to a sea valve. Background Art

[0002] Ship speed logs are generally equipped with electromagnetic sensors and Doppler transducers for measuring ship speed. The electromagnetic sensors and Doppler transducers must be in contact with seawater when in use, otherwise they will not work properly. Therefore, a sea valve is required. The sea valve is installed on the base of the ship's bottom. After the sea valve is opened, the electromagnetic sensor and Doppler transducer can extend through the sea valve to the bottom plate of the ship and come into contact with the seawater.

[0003] Currently, the sea valves used in speed meters are generally ball valves or gate valves. However, ball valves or gate valves with larger diameters generally have disadvantages such as large size and heavy weight. The sea valves require a large installation space, which is not conducive to installation in the narrow hull bottom hold. At the same time, the structure of the above-mentioned control valve body is relatively complex and has a high failure rate.

[0004] Therefore, how to provide a sea valve that can overcome the above problems is an issue that those skilled in the art urgently need to solve. Summary of the Invention

[0005] In view of this, the present invention provides a sea valve.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A sea valve, comprising:

[0008] A valve body, wherein both ends of the valve body are open, a sealing surface is provided inside the valve body, and an open end of the valve body is arranged to pass through the sealing surface;

[0009] The driving part includes a rotating shaft, a connecting rod 1, a connecting rod 2, a connecting block, a connecting rod 3 and a telescopic cylinder. The rotating shaft is rotatably supported inside the valve body. One end of the rotating shaft is fixed to one end of the connecting rod 1 after passing through the valve wall of the valve body. The length direction of the rotating shaft is perpendicular to the length direction of the connecting rod 1. The other end of the connecting rod 1 is hinged to one end of the connecting rod 2 and the two have a hinge axis line 1. The other end of the connecting rod 2 is hinged to the connecting block and the two have a hinge axis line 2. One end of the connecting rod 3 is hinged to the valve body and the two have a hinge axis line 3. The other end of the rod three is hinged to the connecting block, and the two have a hinge axis four. The fixed end of the telescopic cylinder is hinged to the valve body, and the two have a hinge axis five. The telescopic end of the telescopic cylinder is connected to the connecting block; the hinge axis one, the hinge axis two, the hinge axis three, and the hinge axis five are all parallel to the axis of the rotating shaft, the hinge axis two coincides with the hinge axis four, the connecting block is arranged between the hinge axis one and the hinge axis three, and the telescopic direction of the telescopic end of the telescopic cylinder is perpendicular to the axis of the rotating shaft;

[0010] A valve cover is arranged in the valve body, the valve cover is connected to the rotating shaft, one end surface of the valve cover can be in close contact with the sealing surface, and the valve cover can block an open end of the valve body corresponding to the sealing surface.

[0011] It can be seen from the above technical solution that, compared with the prior art, the present invention discloses a sea valve. The present invention designs a valve body, a drive part and a valve cover located in the valve body. The telescopic cylinder in the drive part can drive the rotating shaft to rotate. When the rotating shaft rotates, it can drive the valve cover to press against the sealing surface, thereby realizing the opening and closing of the valve body. The sea valve has a simple and reliable structure, a small size and can be further reduced in weight, thereby reducing the installation and maintenance costs of the sea valve. Under the premise of meeting the large diameter, the valve cover can move flexibly, and the drive part can reliably drive the valve cover to swing, so that the sea valve can reliably realize opening and closing.

[0012] Preferably, the driving unit further comprises a screw, a nut, a connector, and a first spring. The nut is screwed onto the screw, the connector is fixed to one end of the screw, and the connector is fixed to the telescopic end of the telescopic cylinder. The length direction of the screw is the same as the telescopic direction of the telescopic end of the telescopic cylinder. The connecting block has a hole and is slidably mounted on the screw. The spring is set on the screw. The two ends of the first spring respectively abut against the nut and the connecting block, and the connector can abut against the connecting block. The pressing force between the valve cover and the sealing surface is adjustable, and the telescopic end of the telescopic cylinder will not be damaged during the retraction process.

[0013] Preferably, the driving part further comprises a connecting member, the connecting member is located in the valve body, one end of the connecting member is fixed to the rotating shaft, and the other end of the connecting member is connected to the valve cover. The valve cover and the rotating shaft can be reliably connected and fixed.

[0014] Preferably, it also includes a balancing member, which includes a connecting rod, a sealing gasket, a pressure ring, a balancing valve core and a spring; one end face of the valve cover is vertically fixed with two mutually parallel connecting plates 1, and the end of the connecting member away from the rotating shaft is provided with two mutually parallel connecting plates 2, the plate surface of the connecting plate 1 is parallel to the plate surface of the connecting plate 2, and the two connecting plates 2 are arranged between the two connecting plates 1; the connecting rod is simultaneously inserted into the two connecting plates 1 and the two connecting plates 2, and the rod center line of the connecting rod is parallel to the axial center line of the rotating shaft; an installation groove is provided on the end face of the valve cover where the connecting plate 1 is provided, and a through hole is provided on the bottom wall of the installation groove, the sealing gasket is tightly embedded in the installation groove, and the pressure ring is tightly embedded in the installation groove and presses the sealing gasket; the balancing member The valve core is arranged between the two connecting plates 2 and includes a coaxially arranged abutment tube and a limiting rod. One end of the abutment tube is closed, and the tube length of the abutment tube is perpendicular to the rod length of the connecting rod. The limiting rod is fixed to the closed end of the abutment tube and inserted into the through hole. A water flow gap is defined between the limiting rod and the through hole. An elongated hole is defined in the side wall of the abutment tube, and the hole length of the elongated hole is aligned with the tube length of the abutment tube. The connecting rod is passed through the elongated hole. A limiting groove is defined in the side wall of the connecting rod. The second spring is disposed within the abutment tube, one end of the second spring abutting the inner wall of the closed end of the abutment tube, and the other end of the second spring abutting the bottom wall of the limiting groove. The outer wall of the closed end of the abutment tube can seal tightly against the sealing gasket. When the valve cover is closed, it can reliably abut against the sealing surface.

[0015] Preferably, a plurality of sealing convex rings are coaxially arranged on the outer side of the closed end of the abutting tube, and the sealing convex rings can tightly abut the sealing gasket. The closed end of the abutting tube can effectively abut against the sealing gasket and ensure the sealing between the two.

[0016] Preferably, there is a gap between the side wall of the connecting rod and the hole wall of the elongated hole close to the limiting rod. The abutting tube has a certain movement stroke in the direction away from the valve cover.

[0017] Preferably, a sealing member is provided inside an open end of the valve body, the sealing member being provided with the sealing surface, and a communication port communicating with the open end of the valve body being formed on the sealing surface, and the valve cover being capable of sealing the communication port. The machining accuracy of the valve body can be further reduced, thereby ensuring the economic efficiency of the manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0019] Figure 1 An integral axonometric view of a sea valve Figure 1 ;

[0020] Figure 2 An integral axonometric view of a sea valve Figure 2 ;

[0021] Figure 3 A partial axonometric view of a sea valve Figure 1 ;

[0022] Figure 4 A partial axonometric view of a sea valve Figure 2 ;

[0023] Figure 5 A partial axonometric view of a sea valve Figure 3 ;

[0024] Figure 6 A partial axonometric view of a sea valve Figure 4 ;

[0025] Figure 7 A partial axonometric view of a sea valve Figure 5 ;

[0026] Figure 8 A partial axonometric view of a sea valve Figure 6 ;

[0027] Figure 9 A partial axonometric view of a sea valve Figure 7 .

[0028] In the figure:

[0029] 1 is the valve body, 2 is the rotating shaft, 3 is the connecting rod 1, 4 is the connecting rod 2, 5 is the connecting block, 6 is the connecting rod 3, 7 is the telescopic cylinder, 8 is the screw, 9 is the nut, 10 is the connecting head, 11 is the spring 1, 12 is the connecting piece, 13 is the valve cover, 130 is the mounting groove, 131 is the through hole, 14 is the connecting rod, 140 is the limiting groove, 15 is the sealing gasket, 16 is the pressure ring, 17 is the balancing valve core, 170 is the abutment tube, 1700 is the long strip hole, 1701 is the sealing convex ring, 171 is the limiting rod, 18 is the spring 2, 19 is the connecting plate 1, 20 is the connecting plate 2, and 21 is the sealing piece. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] The present invention discloses a sea valve. The present invention designs a valve body 1, a drive unit, and a valve cover 13 located within the valve body 1. The telescopic cylinder 7 in the drive unit can drive the rotating shaft 2 to rotate. When the rotating shaft 2 rotates, it can drive the valve cover 13 to press against the sealing surface, thereby realizing the on-off state of the valve body 1. The sea valve has a simple and reliable structure, a small size, and can be further reduced in weight, thereby reducing the installation and maintenance costs of the sea valve. Under the premise of meeting a large diameter, the valve cover 13 can move flexibly, and the drive unit can reliably drive the valve cover 13 to swing, so that the sea valve can reliably realize on-off state.

[0032] The shape of the opening end of the valve body 1 can be determined according to actual use requirements, that is, it can be adapted to rectangular or irregular sea openings, thereby improving its wide application.

[0033] The telescopic cylinder 7 in the driving part drives the rotating shaft 2 through the connecting rod 1 3, the connecting rod 2 4, the connecting block 5 and the connecting rod 3 6. The telescopic cylinder 7 can achieve high torque rotation of the rotating shaft 2 with a very small thrust. At the same time, the telescopic cylinder 7 responds quickly, so that the sea valve can be quickly opened and closed.

[0034] By designing the spring 11, the valve cover 13 can be reliably pressed against the sealing surface, and the telescopic end of the telescopic cylinder 7 will not be damaged during the retraction process;

[0035] By designing the nut 9, the pressing force between the valve cover 13 and the sealing surface can be adjusted;

[0036] By designing a balancing piece, the design facilitates the tight contact between the valve cover 13 and the sealing surface; the tight contact force between the abutting tube 170 and the sealing gasket 15 comes from the elastic force of the spring 2 18;

[0037] By designing the sealing member 21 , the machining accuracy of the valve body 1 can be reduced, and the economic efficiency of the manufacturing of the sea valve can be improved, while ensuring that the valve cover 13 can effectively realize the opening and closing of the waterway.

[0038] Example

[0039] See attached Figure 1-9 The figure is a schematic diagram of the overall and partial structures of an embodiment of the present invention. The present invention specifically discloses a sea valve installed on the bottom of a ship. The sea valve comprises:

[0040] The valve body 1 has openings at both ends. One end of the valve body 1 is fixed to and communicates with the bottom of the ship, and the other end of the valve body 1 is communicated with seawater. The valve body 1 has a sealing surface inside. The open end of the valve body 1 near the bottom of the ship passes through the sealing surface. An electromagnetic sensor and a Doppler transducer are installed on the hull. When the valve body 1 is in a conducting state, the electromagnetic sensor and the Doppler transducer can contact the seawater, thereby realizing the measurement of the hull speed;

[0041] The driving part includes a rotating shaft 2, a connecting rod 3, a connecting rod 2 4, a connecting block 5, a connecting rod 3 6 and a telescopic cylinder 7. The valve body 1 is internally supported by the rotating shaft 2. One end of the rotating shaft 2 is fixed to one end of the connecting rod 3 after passing through the valve wall of the valve body 1. The length direction of the rotating shaft 2 is perpendicular to the length direction of the connecting rod 3. The other end of the connecting rod 3 is hinged to one end of the connecting rod 2 4 and the two have a hinge axis 1. The other end of the connecting rod 2 4 is hinged to the connecting block 5 and the two have a hinge axis 2. One end of the connecting rod 3 6 is hinged to the valve body 1 and the two have a hinge axis 3. The other end of the connecting rod 3 6 is hinged to the connecting block 5 and the two have a hinge axis 4. The fixed end of the telescopic cylinder 7 is hinged to the valve body 1 and the two have a hinge axis 5 , the telescopic end of the telescopic cylinder 7 is connected to the connecting block 5; the articulation axis line 1, the articulation axis line 2, the articulation axis line 3 and the articulation axis line 5 are all parallel to the axis line of the rotating shaft 2, the articulation axis line 2 coincides with the articulation axis line 4, the connecting block 5 is arranged between the articulation axis line 1 and the articulation axis line 3, and the telescopic direction of the telescopic end of the telescopic cylinder 7 is perpendicular to the axis line of the rotating shaft 2; the telescopic cylinder 7 in this embodiment is an electric push rod. Since it is provided with the rotating shaft 2, the connecting rod 1 3, the connecting rod 2 4, the connecting block 5 and the connecting rod 3 6, when the telescopic end of the telescopic cylinder 7 is extended or retracted, the rotating shaft 2 can realize forward or reverse rotation, that is, the linear motion of the telescopic end of the telescopic cylinder 7 can be converted into the rotation of the rotating shaft 2; the telescopic cylinder 7 is connected to the controller on the hull.

[0042] A hole is opened on the valve wall of the valve body 1 and a copper sleeve is tightly embedded in it. The outer wall of the copper sleeve is coated with quick-drying epoxy resin to achieve sealing and fixation between the copper sleeve and the valve body 1. The rotating shaft 2 is coaxial and slides tightly through the inner side of the copper sleeve, which can prevent the valve body 1 from wear.

[0043] The valve cover 13 is arranged in the valve body 1. The valve cover 13 has various shapes. In this embodiment, the valve cover 13 is circular. The valve cover 13 is connected to the rotating shaft 2. When the rotating shaft 2 rotates, the valve cover 13 can swing around the rotating shaft 2. One end face of the valve cover 13 can be in close contact with the sealing surface. The valve cover 13 can block an open end of the valve body 1 corresponding to the sealing surface, thereby realizing the closure of the sea valve.

[0044] To be more specific, the driving part also includes a screw rod 8, a nut 9, a connector 10 and a spring 11. The screw rod 8 is screwed with a nut 9, and one end of the screw rod 8 is fixed with a connector 10. The connector 10 is fixed to the telescopic end of the telescopic cylinder 7. The rod length direction of the screw rod 8 is the same as the telescopic direction of the telescopic end of the telescopic cylinder 7. The connecting block 5 has an opening and is slidably sleeved on the screw rod 8. The spring 11 is sleeved on the screw rod 8. The two ends of the spring 11 are respectively in contact with the nut 9 and the connecting block 5, and the connector 10 can be in contact with the connecting block 5. When the telescopic end of the telescopic cylinder 7 retracts, the screw rod 8 moves and drives the connecting block 5 to move through the nut 9 and the spring 11, thereby realizing Now the rotating shaft 2 rotates. After the valve cover 13 is in close contact with the sealing surface, due to the provision of spring 11, the pressing force of the valve cover 13 on the sealing surface comes from the elastic force of spring 11. Spring 11 also plays the role of elastic buffer here. On the one hand, it avoids the situation where the telescopic end of the telescopic cylinder 7 still retracts after the valve cover 13 is in close contact with the sealing surface, causing damage to the telescopic cylinder 7. On the other hand, it ensures that the pressing force between the valve cover 13 and the sealing surface is stable. At the same time, the size of the pressing force between the valve cover 13 and the sealing surface can be adjusted by screwing the nut 9. When the telescopic end of the telescopic cylinder 7 is extended, the connector 10 can push the connecting block 5 to move, thereby realizing the rotation of the rotating shaft 2.

[0045] More specifically, the driving part also includes a connecting member 12, which is located in the valve body 1, one end of the connecting member 12 is fixed to the rotating shaft 2, and the other end of the connecting member 12 is connected to the valve cover 13. This design ensures that the valve cover 13 can be reliably connected to the rotating shaft 2.

[0046] More specifically, a balancing member is also included, which includes a connecting rod 14, a sealing gasket 15, a pressure ring 16, a balancing valve core 17 and a spring 18.

[0047] Two parallel connecting plates 19 are vertically fixed to one end surface of the valve cover 13. Two parallel connecting plates 20 are provided at the end of the connecting member 12 away from the rotating shaft 2. The plate surface of the connecting plate 19 is parallel to the plate surface of the connecting plate 20. The two connecting plates 20 are arranged between the two connecting plates 19.

[0048] The connecting rod 14 is inserted into the two connecting plates 19 and the two connecting plates 20 at the same time, thereby fixing the connecting member 12 and the valve cover 13. The center line of the connecting rod 14 is parallel to the axis of the rotating shaft 2.

[0049] A circular mounting groove 130 is formed on one end surface of the valve cover 13 on which the connecting plate 19 is provided. A circular through hole 131 is formed in the center of the bottom wall of the mounting groove 130. The sealing gasket 15 is tightly fitted in the mounting groove 130. The pressure ring 16 is tightly fitted in the mounting groove 130 and presses the sealing gasket 15 to ensure that the sealing gasket 15 does not fall out of the mounting groove 130.

[0050] The balancing valve core 17 is arranged between the two connecting plates 20 and includes a coaxially arranged abutment tube 170 and a limit rod 171. One end of the abutment tube 170 is closed, and the tube length direction of the abutment tube 170 is perpendicular to the rod length direction of the connecting rod 14. The limit rod 171 is fixed to the closed end of the abutment tube 170. The limit rod 171 is inserted into the through hole 131. There is a water flow gap between the limit rod 171 and the through hole 131. A long strip hole 170 is opened on the side wall of the abutment tube 170. 0, the length direction of the elongated hole 1700 is the same as the length direction of the abutting tube 170, and a connecting rod 14 is passed through the elongated hole 1700; a limiting groove 140 is defined on the side wall of the connecting rod 14, and a second spring 18 is disposed in the abutting tube 170, with one end of the second spring 18 abutting against the inner wall of the closed end of the abutting tube 170, and the other end of the second spring 18 abutting against the bottom wall of the limiting groove 140, and the outer wall of the closed end of the abutting tube 170 is tightly sealed against the sealing gasket 15;

[0051] When there is no water in the valve body 1 or the valve cover 13 is open, the abutting force between the abutting tube 170 and the sealing gasket 15 comes from the elastic force of the second spring 18. When the valve cover 13 is closed, the abutting force between the abutting tube 170 and the sealing gasket 15 comes from the elastic force of the second spring 18 and the upward pressure exerted by the seawater on the valve cover 13. Because the valve body 1 is installed on the bottom of the ship, which is below sea level, the seawater will push up the valve cover 13, further pressing the valve cover 13 and the sealing surface.

[0052] When the valve cover 13 and the sealing surface are not in a sealed and tight state, when the valve cover 13 needs to be closed, the water pressure in the space above the valve cover 13 will overcome the elastic force of the spring 2 18 and push the abutment tube 170 to move. After the abutment tube 170 moves, it will be out of the tight abutment state with the sealing gasket 15. At this time, the through hole 131 is connected, and the water pressure above and below the valve cover 13 will be balanced due to the connection of the through hole 131. At this time, the valve cover 13 can be closed smoothly, that is, the valve cover 13 and the sealing surface are sealed and tight smoothly.

[0053] A plurality of sealing convex rings 1701 are coaxially provided on the outer side of the closed end of the abutting tube 170 . The sealing convex rings 1701 can tightly abut the sealing gasket 15 . The design of multiple sealing convex rings 1701 ensures that the closed end of the abutting tube 170 and the sealing gasket 15 are tightly sealed.

[0054] There is a gap between the side wall of the connecting rod 14 and the hole wall of the elongated hole 1700 near the limiting rod 171 , which ensures that when the abutting tube 170 compresses the spring 2 18 , the abutting tube 170 has a certain movement stroke in the direction away from the valve cover 13 .

[0055] A seal 21 is provided on the inner side of an open end of the valve body 1 close to the bottom of the ship. The seal 21 is provided with a sealing surface. A circular communication port connected to the open end of the valve body 1 is provided on the sealing surface. The valve cover 13 can seal the communication port. An end face of the valve cover 13 away from the connecting plate 19 has a circular protrusion, and a through hole 131 is arranged in the center of the circular protrusion. After the valve cover 13 is buckled, the circular protrusion will be tightly embedded in the communication port. This design can improve the sealing effect of the communication port. The design of the seal 21 ensures that the sealing surface can be tightly sealed against the valve cover 13. At the same time, the processing accuracy of the valve body 1 is reduced. While ensuring the sealing reliability, the production and processing cost of the sea valve is low.

[0056] When the sea valve is in use, the telescopic end of the telescopic cylinder 7 retracts or extends. When the telescopic end of the telescopic cylinder 7 is in motion, the rotating shaft 2 rotates, and the rotating shaft 2 drives the valve cover 13 to swing, thereby achieving the sealing contact and separation between the valve cover 13 and the sealing surface;

[0057] When the valve cover 13 needs to be closed, the valve cover 13 swings and is about to be tightly pressed against the sealing surface. The water above the valve cover 13 will push the abutment tube 170 to move. After the abutment tube 170 moves, the through hole 131 will be connected, and the water pressure above and below the valve cover 13 will be balanced. At this time, the valve cover 13 can be reliably sealed against the sealing surface.

[0058] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0059] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sea valve, characterized in that: include: A valve body (1), the valve body (1) is open at both ends, the valve body (1) has a sealing surface inside, and one open end of the valve body (1) is arranged to pass through the sealing surface; The driving part includes a rotating shaft (2), a connecting rod 1 (3), a connecting rod 2 (4), a connecting block (5), a connecting rod 3 (6) and a telescopic cylinder (7). The rotating shaft (2) is rotatably supported inside the valve body (1). One end of the rotating shaft (2) is fixed to one end of the connecting rod 1 (3) after passing through the valve wall of the valve body (1). The length direction of the rotating shaft (2) is perpendicular to the length direction of the connecting rod 1 (3). The other end of the connecting rod 1 (3) is hinged to one end of the connecting rod 2 (4) and the two have a hinge axis 1. The other end of the connecting rod 2 (4) is hinged to the connecting block (5) and the two have a hinge axis 2. One end of the connecting rod 3 (6) is hinged to the valve body (1) and The two have a hinge axis three, the other end of the connecting rod three (6) is hinged to the connecting block (5) and the two have a hinge axis four, the fixed end of the telescopic cylinder (7) is hinged to the valve body (1) and the two have a hinge axis five, and the telescopic end of the telescopic cylinder (7) is connected to the connecting block (5); the hinge axis one, the hinge axis two, the hinge axis three and the hinge axis five are all parallel to the axis of the rotating shaft (2), the hinge axis two coincides with the hinge axis four, the connecting block (5) is arranged between the hinge axis one and the hinge axis three, and the telescopic direction of the telescopic end of the telescopic cylinder (7) is perpendicular to the axis of the rotating shaft (2); a valve cover (13), the valve cover (13) being arranged in the valve body (1), the valve cover (13) being connected to the rotating shaft (2), one end surface of the valve cover (13) being able to be in close contact with the sealing surface, and the valve cover (13) being able to block an open end of the valve body (1) corresponding to the sealing surface; The driving part further comprises a connecting member (12), wherein the connecting member (12) is located in the valve body (1), one end of the connecting member (12) is fixed to the rotating shaft (2), and the other end of the connecting member (12) is connected to the valve cover (13); The invention also includes a balancing member, which includes a connecting rod (14), a sealing gasket (15), a balancing valve core (17) and a spring 2 (18). One end surface of the valve cover (13) is vertically fixed with two mutually parallel connecting plates 1 (19). The end of the connecting member (12) away from the rotating shaft (2) is provided with two mutually parallel connecting plates 2 (20). The plate surface of the connecting plate 1 (19) is parallel to the plate surface of the connecting plate 2 (20). The two connecting plates 2 (20) are arranged between the two connecting plates 1 (19). 14) are inserted on the two connecting plates (19) and the two connecting plates (20) at the same time, and the center line of the connecting rod (14) is parallel to the axis line of the rotating shaft (2); a mounting groove (130) is provided on one end face of the valve cover (13) on which the connecting plate (19) is provided, and a through hole (131) is provided on the bottom wall of the mounting groove (130), and the sealing gasket (15) is tightly embedded in the mounting groove (130); the balancing valve core (17) is arranged between the two connecting plates (20) and includes a coaxial The abutment tube (170) and the limiting rod (171) are arranged, one end of the abutment tube (170) is closed, the tube length direction of the abutment tube (170) is perpendicular to the rod length direction of the connecting rod (14), the limiting rod (171) is fixed to the closed end of the abutment tube (170), the limiting rod (171) is inserted into the through hole (131), and there is a water flow gap between the limiting rod (171) and the through hole (131), and a long hole (1700) is opened on the side wall of the abutment tube (170), and the long hole (1700) ) is in the same direction as the tube length of the abutting tube (170), and the connecting rod (14) is passed through the elongated hole (1700); a limiting groove is provided on the side wall of the connecting rod (14), and the spring 2 (18) is arranged in the abutting tube (170), one end of the spring 2 (18) abuts against the inner wall of the closed end of the abutting tube (170), and the other end of the spring 2 (18) abuts against the bottom wall of the limiting groove, and the outer wall of the closed end of the abutting tube (170) can be sealed tightly against the sealing gasket (15).

2. A sea valve according to claim 1, characterized in that: The driving part also includes a screw (8), a nut (9), a connector (10) and a spring (11). The nut (9) is screwed onto the screw (8). The connector (10) is fixed to one end of the screw (8). The connector (10) is fixed to the telescopic end of the telescopic cylinder (7). The rod length direction of the screw (8) is the same as the telescopic direction of the telescopic end of the telescopic cylinder (7). The connecting block (5) is opened and slidably mounted on the screw (8). The spring (11) is mounted on the screw (8). The two ends of the spring (11) are respectively in contact with the nut (9) and the connecting block (5). The connecting head (10) can be in contact with the connecting block (5).

3. A sea valve according to claim 1, characterized in that: The balancing member further comprises a pressure ring (16), which is tightly embedded in the mounting groove (130) and presses the sealing gasket (15).

4. A sea valve according to claim 3, characterized in that: A plurality of sealing convex rings (1701) are coaxially provided on the outer side of the closed end of the abutting tube (170), and the sealing convex rings (1701) can tightly abut against the sealing gasket (15).

5. A sea valve according to claim 3, characterized in that: There is a gap between the side wall of the connecting rod (14) and the hole wall of the elongated hole (1700) on one side close to the limiting rod (171).

6. A sea valve according to claim 1, characterized in that: A sealing member (21) is sealed inside an open end of the valve body (1), and the sealing member (21) is provided with the sealing surface. A communication port communicating with the open end of the valve body (1) is provided on the sealing surface, and the valve cover (13) is capable of sealing the communication port.

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