Check valve

Abstract

The invention discloses a check valve, which belongs to the field of valves, and mainly comprises a valve body, a valve cover, a transmission mechanism, a control mechanism and a valve core mechanism, and the valve core mechanism is matched with a first sealing port and a second sealing port; the control mechanism is matched with the valve cover; the transmission mechanism is used for transmitting the control mechanism to perform state switching; when the control mechanism is in a right end state, the valve core mechanism is in an A port sealing state; when the control mechanism is in a horizontal state, the valve core mechanism is in an A port through state; when the control mechanism is in an inclined state, the valve element mechanism is in a full-communication state; when the control mechanism is in a vertical state, the valve element mechanism is in a B-opening state; when the control mechanism is in a lower end state, the valve core mechanism is in a B port sealing state; the invention also discloses a method. The non-return direction can be changed, meanwhile, a medium can be cut off according to needs, all-pass can be achieved, and the functions are diversified; the device is good in stability, convenient to observe, accurate in judgment and convenient to use.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to a check valve. Background Art

[0002] Check valve is a commonly used valve in pipeline system. It is a valve that automatically opens and closes the valve disc by the flow of the medium itself to prevent the medium from flowing back. The existing check valve is mainly composed of: valve body, valve seat, valve disc, guide sleeve. With the progress of society, the development, evolution and innovation of check valves have made comprehensive breakthroughs. At the same time, it can be seen from the international and domestic market demand that there is a large demand for check valves all over the world.

[0003] However, when the existing check valve is in use, it can only realize the check function for the medium flowing in one direction. In a more complicated pipeline, the existing check valve cannot control the check direction, and the check valve can only be removed and then installed in the opposite direction. This process is relatively complicated and requires a lot of manpower. At the same time, the current check valve only has a one-way check function and cannot control the complete connection and complete closure of the flowing medium in the pipeline. It has a single function and can only be used in certain occasions. It cannot adapt to the changing pipeline system and has poor adaptability. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a check valve.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a check valve, comprising: a valve body and a valve cover, wherein an interface A is provided on the upper right side of the valve body, an interface B is provided on the lower left side of the valve body, a valve body cavity is provided in the valve body, a first sealing port is provided between the valve body cavity and the interface A, and a second sealing port is provided between the valve body cavity and the interface B; the valve cover is fixedly arranged above the valve body to block the valve body cavity; this embodiment also includes: a transmission mechanism, a control mechanism and a valve core mechanism; the valve core mechanism is arranged in the valve body cavity, the valve core mechanism cooperates with the first sealing port or the second sealing port, and the valve core mechanism can switch between the A port sealing state, the A port pass state, the full connection state, the B port pass state and the B port sealing state; the control mechanism is arranged in the valve body cavity, the control mechanism cooperates with the valve cover, and the control mechanism can switch between the right end state, the horizontal state, the inclined state, the vertical state and the lower end state; the transmission mechanism is arranged in the valve body cavity to transmit the control mechanism. The control mechanism switches the state; when the valve core mechanism switches to the A-port sealing state, the valve core mechanism blocks the first sealing port; when the valve core mechanism switches to the A-port passing state, the valve core mechanism allows the medium to flow from interface A to interface B in one direction; when the valve core mechanism switches to the full-pass state, the medium can flow between interface A and interface B; when the valve core mechanism switches to the B-port passing state, the valve core mechanism allows the medium to flow from interface B to interface A in one direction; when the valve core mechanism switches to the B-port sealing state, the valve core mechanism blocks the second sealing port; when the control mechanism is in the right end state, the valve core mechanism switches to the A-port sealing state; when the control mechanism is in the horizontal state, the valve core mechanism switches to the A-port passing state; when the control mechanism is in the inclined state, the valve core mechanism switches to the full-pass state; when the control mechanism is in the vertical state, the valve core mechanism switches to the B-port passing state; when the control mechanism is in the lower end state, the valve core mechanism switches to the B-port sealing state.

[0006] Preferably, a valve cover groove is provided on the lower side of the valve cover, and a horizontal track groove, an arc track groove and a vertical track groove are respectively provided on the inner wall on the front side of the valve cover groove, one end of the arc track groove is connected to the left end of the horizontal track groove, and the other end is connected to the upper end of the vertical track groove.

[0007] Preferably, a dial is provided on the front side of the valve body, and a first scale, a second scale, a third scale, a fourth scale and a fifth scale are respectively provided on the dial along the circumferential direction.

[0008] Preferably, the transmission mechanism comprises: a handle, a worm, a worm wheel, a first gear, a second gear and a pointer; the worm wheel is rotatably arranged in the valve body cavity; the worm is rotatably arranged on the valve cover, the lower side of the worm is meshed with the worm wheel, and the upper side passes through the valve cover; the handle and the upper end of the worm are fixedly connected; the first gear is rotatably arranged in the valve body cavity, and the first gear and the worm wheel are fixedly connected; the pointer is rotatably arranged on the front side of the dial, and the pointer and the worm wheel are fixedly connected; the second gear is rotatably arranged in the valve body cavity, and the second gear is meshed with the first gear.

[0009] Preferably, the control mechanism comprises: a first swing rod, a second swing rod and a control rod; one end of the first swing rod is fixedly connected to the second gear, and a first swing groove is axially provided on the first swing rod; one end of the second swing rod is rotatably arranged in the valve cover groove, and a second swing groove is axially provided on the second swing rod; the control rod is slidably arranged between the first swing rod and the second swing rod, a control slider is provided on the front side of the control rod, the control slider is slidably arranged in the second swing groove, a first control pin is provided on the front side of the control slider, the first control pin can slide along the horizontal track groove, the arc track groove and the vertical track groove, a second control pin is provided on the rear side of the control rod, the second control pin is coaxial with the first control pin, and the second control pin is slidably arranged in the first swing groove.

[0010] Preferably, the valve core mechanism comprises: a valve core, a valve stem and a valve core spring; one end of the valve stem is fixedly connected to one end of the control rod; the valve core is axially slidably arranged at the other end of the valve stem, and the valve core can cooperate with the first sealing port or the second sealing port to form a seal; the valve core spring is arranged in the valve stem to drive the valve core to move away from the valve stem.

[0011] Preferably, when the control mechanism is in the lower end state, the pointer points to the first scale; when the control mechanism is in the vertical state, the pointer points to the second scale; when the control mechanism is in the inclined state, the pointer points to the third scale; when the control mechanism is in the horizontal state, the pointer points to the fourth scale; when the control mechanism is in the right end state, the pointer points to the fifth scale.

[0012] Preferably, the width of the control sliding block is equal to the width of the second swinging groove, and the control rod and the second swinging rod cannot rotate relative to each other.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] 1. The control mechanism cooperates with the valve cover, and the control mechanism can drive the valve core mechanism to change the working state, so that the present invention can change the check direction, thereby improving the applicability of the present invention and expanding the scope of use of the present invention;

[0015] 2. By setting the valve core mechanism and cooperating with the control mechanism, when the present invention needs to block the interface A or the interface B, the valve stem can be controlled to overcome the valve core spring and stick to the valve core, so that the valve core cannot move, thereby realizing the blocking function. The present invention can not only realize the check function, but also cut off the medium as needed, and has powerful functions;

[0016] 3. By setting the control mechanism and the valve core mechanism, the control mechanism and the valve cover cooperate to drive the valve core to the middle position between the first sealing port and the second sealing port, so that the medium can directly pass through the present invention to achieve full passage. The present invention can achieve the full passage function and has a wide range of applications;

[0017] 4. By arranging a worm and a worm gear transmission in the transmission mechanism, the transmission mechanism is self-locked after driving the control mechanism and the valve core mechanism to switch working states, thereby ensuring the stability of the present invention when in use;

[0018] 5. By setting a pointer and a dial on the valve body, when the present invention is used, the working state of the present invention can be judged by observing the scale pointed by the pointer, which is convenient to observe, accurate to judge, and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional view of the present invention;

[0020] Figure 2 A three-dimensional view from another perspective of the present invention;

[0021] Figure 3 For the present invention Figure 2 A partial enlarged view of point I in the middle;

[0022] Figure 4 A three-dimensional view of the valve core mechanism of the present invention when it is in the A-port open state;

[0023] Figure 5 It is a three-dimensional view of the valve core mechanism of the present invention when it is in the A-port sealing state;

[0024] Figure 6 A three-dimensional view of the valve core mechanism of the present invention when it is in a fully connected state;

[0025] Figure 7 A three-dimensional view of the valve core mechanism of the present invention when it is in the B-port open state;

[0026] Figure 8It is a three-dimensional view of the valve core mechanism of the present invention when it is in the B port sealing state;

[0027] Fig. 9 A three-dimensional view of the valve cover of the present invention;

[0028] Fig.10 A three-dimensional view of the interior of the valve cover of the present invention;

[0029] Fig.11 A three-dimensional view of the inside of the valve cover of the present invention from another angle;

[0030] Fig.12 A three-dimensional view of the cooperation between the worm wheel, the pointer and the first gear of the present invention;

[0031] Fig.13 A three-dimensional view of the cooperation between the first swing lever and the second gear of the present invention;

[0032] Fig.14 It is a three-dimensional view of the cooperation between the valve core mechanism and the control rod of the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with reference to the accompanying drawings.

[0034] Combination Figure 1-Figure 14As shown, a check valve of the present embodiment comprises: a valve body 1 and a valve cover 2, an interface A is provided on the upper right side of the valve body 1, an interface B is provided on the lower left side of the valve body 1, a valve body cavity is provided in the valve body 1, a first sealing port is provided between the valve body cavity and the interface A, and a second sealing port is provided between the valve body cavity and the interface B; the valve cover 2 is fixedly arranged above the valve body 1 to block the valve body cavity; the present embodiment also comprises: a transmission mechanism 3, a control mechanism 4 and a valve core mechanism 5; the valve core mechanism 5 is arranged in the valve body cavity, the valve core mechanism 5 cooperates with the first sealing port or the second sealing port, and the valve core mechanism 5 can switch between the A port sealing state, the A port pass state, the full connection state, the B port pass state and the B port sealing state; the control mechanism 4 is arranged in the valve body cavity, the control mechanism 4 cooperates with the valve cover 2, and the control mechanism 4 can switch between the right end state, the horizontal state, the inclined state, the vertical state and the lower end state; the transmission mechanism 3 is arranged in the valve body cavity to drive the control mechanism 4 to switch the state; when the valve When the core mechanism 5 is switched to the A-port sealing state, the valve core mechanism 5 blocks the first sealing port; when the valve core mechanism 5 is switched to the A-port passing state, the valve core mechanism 5 allows the medium to flow unidirectionally from interface A to interface B; when the valve core mechanism 5 is switched to the full-pass state, the medium can flow between interface A and interface B; when the valve core mechanism 5 is switched to the B-port passing state, the valve core mechanism 5 allows the medium to flow unidirectionally from interface B to interface A; when the valve core mechanism 5 is switched to the B-port sealing state, the valve core mechanism 5 blocks the second sealing port; when the control mechanism 4 is in the right end state, the valve core mechanism 5 switches to the A-port sealing state; when the control mechanism 4 is in the horizontal state, the valve core mechanism 5 switches to the A-port passing state; when the control mechanism 4 is in the inclined state, the valve core mechanism 5 switches to the full-connection state; when the control mechanism 4 is in the vertical state, the valve core mechanism 5 switches to the B-port passing state; when the control mechanism 4 is in the lower end state, the valve core mechanism 5 switches to the B-port sealing state.

[0035] Combination Figure 4-Figure 11 As shown, in this embodiment, a valve cover groove is provided on the lower side of the valve cover 2, and a horizontal track groove 211, an arc track groove 212 and a vertical track groove 213 are respectively provided on the inner wall on the front side of the valve cover groove. One end of the arc track groove 212 is connected to the left end of the horizontal track groove 211, and the other end is connected to the upper end of the vertical track groove 213.

[0036] Combination Figure 2 , Figure 3 As shown, in this embodiment, a dial 11 is provided on the front side of the valve body 1, and a first scale 111, a second scale 112, a third scale 113, a fourth scale 114 and a fifth scale 115 are respectively provided on the dial 11 along the circumferential direction.

[0037] Combination Figure 4-Figure 8 , Fig.12 , Fig.13As shown, in this embodiment, the transmission mechanism 3 includes: a handle 31, a worm 32, a worm wheel 33, a first gear 34, a second gear 35 and a pointer 36; the worm wheel 33 is rotatably arranged in the valve body cavity; the worm 32 is rotatably arranged on the valve cover 2, the lower side of the worm 32 is meshed with the worm wheel 33, and the upper side passes through the valve cover 2; the handle 31 and the upper end of the worm 32 are fixedly connected; the first gear 34 is rotatably arranged in the valve body cavity, and the first gear 34 and the worm wheel 33 are fixedly connected; the pointer 36 is rotatably arranged on the front side of the dial 11, and the pointer 36 and the worm wheel 33 are fixedly connected; the second gear 35 is rotatably arranged in the valve body cavity, and the second gear 35 is meshed with the first gear 34.

[0038] At this time, by setting the pointer 36 and setting the dial 11 on the valve body, when the present invention is used, the working state of the present invention can be judged by observing the scale pointed by the pointer 36, which is convenient to observe, accurate to judge, and easy to use.

[0039] At this time, by means of arranging the worm 32 and the worm wheel 33 in the transmission mechanism 3, the transmission mechanism 3 is self-locked after driving the control mechanism 4 and the valve core mechanism 5 to switch the working state, thereby ensuring the stability of the present invention when used.

[0040] Combination Figure 4-Figure 8 As shown, in this embodiment, the control mechanism 4 includes: a first swing rod 41, a second swing rod 42 and a control rod 43; one end of the first swing rod 41 is fixedly connected to the second gear 35, and a first swing groove 411 is axially provided on the first swing rod 41; one end of the second swing rod 42 is rotatably arranged in the valve cover groove, and a second swing groove 421 is axially provided on the second swing rod 42; the control rod 43 is slidably arranged between the first swing rod 41 and the second swing rod 42, a control slider 431 is provided on the front side of the control rod 43, the control slider 431 is slidably arranged in the second swing groove 421, a first control pin 432 is provided on the front side of the control slider 431, the first control pin 432 can slide along the horizontal track groove 211, the arc track groove 212 and the vertical track groove 213, a second control pin 433 is provided on the rear side of the control rod 43, the second control pin 433 is coaxial with the first control pin 432, and the second control pin 433 is slidably arranged in the first swing groove 411.

[0041] At this time, with the help of the cooperation between the control mechanism 4 and the valve cover 2, the control mechanism 4 can drive the valve core mechanism 5 to change the working state, so that the present invention can change the check direction, thereby improving the applicability of the present invention and expanding the scope of use of the present invention.

[0042] Combination Figure 4-Figure 8 , Fig.14As shown, in this embodiment, the valve core mechanism 5 includes: a valve core 51, a valve stem 52 and a valve core spring 53; one end of the valve stem 52 is fixedly connected to one end of the control rod 43; the valve core 51 is axially slidably arranged at the other end of the valve stem 52, and the valve core 51 can cooperate with the first sealing port or the second sealing port to form a seal; the valve core spring 53 is arranged in the valve stem 52 to drive the valve core 51 to move away from the valve stem 52.

[0043] At this time, by setting up the valve core mechanism 5, through the cooperation of the valve core mechanism 5 and the control mechanism 4, when the present invention needs to block the interface A or the interface B, the valve stem 52 can be controlled to overcome the valve core spring 53 and stick to the valve core 51, so that the valve core 51 cannot move, thereby realizing the blocking function, so that the present invention can not only realize the check function, but also can cut off the medium as needed, and has powerful functions.

[0044] At this time, by means of setting the control mechanism 4 and the valve core mechanism 5, the control mechanism 4 and the valve cover 2 cooperate to drive the valve core 51 to the middle position between the first sealing port and the second sealing port, so that the medium can directly pass through the present invention to achieve full passage. The present invention can achieve the full passage function and has a wide range of uses.

[0045] Combination Figure 2-Figure 8 As shown, in this embodiment, when the control mechanism 4 is in the lower end state, the pointer 36 points to the first scale 111; when the control mechanism 4 is in the vertical state, the pointer 36 points to the second scale 112; when the control mechanism 4 is in the inclined state, the pointer 36 points to the third scale 113; when the control mechanism 4 is in the horizontal state, the pointer 36 points to the fourth scale 114; when the control mechanism 4 is in the right end state, the pointer 36 points to the fifth scale 115.

[0046] Combination Figure 4-Figure 8 , Fig.14 As shown, in this embodiment, the width of the control slider 431 is equal to the width of the second swing slot 421, and the control rod 43 and the second swing rod 42 cannot rotate relative to each other.

[0047] The working principle of this check valve is as follows:

[0048] like Figure 5The above is the internal structure of the present invention. At this time, the interface A of the present invention is blocked, the control mechanism 4 is in the right end state, the valve core mechanism 5 is in the A port sealing state, and the pointer 36 points to the fifth scale 115. At this time, since the valve stem 52 is against the valve core 51, the valve stem 52 is fixedly set on the control rod 43, the second control pin 433 slides in the first swing groove 411, the first sliding pin 432 slides in the horizontal track groove 211, and the control slider 431 slides in the second swing groove 421. The first swing rod 41 and the second gear 35 Fixed connection, since the second gear 35 and the first gear 34 are meshed, the first gear 34 and the worm wheel 33 are fixedly connected, and the worm wheel 33 and the worm 32 are meshed, since the worm wheel 33 cannot drive the worm 32 to rotate, the worm wheel 33 cannot rotate, and the first swing rod 41 cannot rotate, and the valve stem 43, the valve stem 52 and the valve core 51 cannot move, the control mechanism 4 remains in the right end state, and the valve core mechanism 5 remains in the A-port sealing state. At this time, the valve core 51 and the first sealing port cooperate to form a seal, and the medium cannot pass through the present invention.

[0049] When the present invention needs to realize the function that the interface A flows in the direction of the interface B and the interface B is blocked in the direction of the interface A, it is necessary to rotate the handle 31 to drive the worm 32 to rotate, and the first swinging rod 41 is driven to rotate counterclockwise through the cooperation between the worm wheel 33, the first gear 34, the second gear 35 and the first swinging rod 41 ( Figure 5 The second control pin 433 slides in the first swing groove 411, and then drives the first control pin 432 to slide leftward along the horizontal track groove 211, and drives the control slider 431 to slide leftward along the second swing groove 421, thereby driving the control rod 43 to move leftward along the horizontal track groove 211. When the pointer 36 points to the fourth scale 114, the handle 31 is stopped from rotating, and the control mechanism 4 is switched to the horizontal state. At this time, the valve stem 52 is away from the valve core 51. Under the action of the valve core spring 53, the valve core 51 still blocks the first sealing port, and the valve core mechanism 5 is switched to the A port pass state (such as Figure 4 As shown), at this time, the external medium flows in through the interface A, pushing the valve core 51 to overcome the movement of the valve core spring 53, so that the valve core 51 is away from the first sealing port, and the medium enters the valve body cavity, and then flows out through the interface B, while the medium that flows into the valve body cavity through the interface B cannot flow out through the interface A. At this time, the present invention realizes the check function.

[0050] When the present invention needs to realize forward and reverse flow between the interface A and the interface B, the handle 31 is continuously rotated, thereby driving the pointer 36 to rotate in the direction of the third scale 113, and driving the first swinging rod 41 to continue to rotate counterclockwise ( Figure 4When the first control pin 432 enters the arc track groove 212, the first swing rod 41 continues to rotate counterclockwise, driving the first control pin 432 to slide along the arc track groove 212. Since the control rod 43 and the second swing rod 42 cannot rotate relative to each other, and the rotation center of the second swing rod 42 is concentric with the center of the arc track groove 212, the second swing rod 42 is driven to rotate counterclockwise, thereby driving the valve stem 52 to rotate, driving the valve core 51 away from the first sealing port. When the pointer 36 points to the third scale 113, the handle 31 is stopped, and the control mechanism 4 is switched to the tilted state. The valve stem 52 drives the valve core 51 to move, so that the valve core 51 comes to the middle position between the first sealing port and the second sealing port, and the valve core mechanism 5 is switched to the full connection state (such as Figure 6 As shown), at this time, the external medium can flow forward and backward between the interface A and the interface B, and the present invention realizes the full-pass function.

[0051] When the present invention needs to realize the function that the interface B flows toward the interface A and the interface A is blocked toward the interface B, it is necessary to continue to rotate the handle 31, thereby driving the pointer 36 to rotate toward the second scale 112, and driving the first swing rod 41 to continue to rotate counterclockwise ( Figure 6 ), and then the valve core 51 is driven to continue to rotate through the control rod 43 and the valve stem 52. When the first control pin 432 enters the vertical track groove 213, the control rod 43 and the valve stem 52 are vertically downward, and the valve core 51 comes to the top of the second sealing port. The first swing rod 41 continues to rotate counterclockwise, driving the first control pin 432 to slide along the vertical track groove 213, so that the control rod 43 and the valve stem 52 move downward, driving the valve core 51 to approach the second sealing port. When the pointer 36 points to the second scale 112, the handle 31 is stopped from rotating, and the control mechanism 4 is switched to the vertical state. At this time, the valve stem 53 is away from the valve core 51, but under the action of the valve core spring 53, the valve core 51 blocks the second sealing port, and the valve core mechanism 5 is switched to the B port pass state (such as Figure 7 As shown), at this time, the external medium flows in through the interface B, pushing the valve core 51 to overcome the movement of the valve core spring 53, so that the valve core 51 is away from the second sealing port, and the medium enters the valve body cavity, and then flows out through the interface A, while the medium that flows into the valve body cavity through the interface A cannot flow out through the interface B. At this time, the present invention realizes the check function.

[0052] When the present invention needs to block the B port, the handle 31 needs to be rotated further, thereby driving the pointer 36 to rotate in the direction of the first scale 111, and driving the first swinging rod 41 to continue to rotate counterclockwise ( Figure 7The control rod 43 is driven to continue to move downward along the vertical track groove 213, driving the valve stem 52 to overcome the valve core spring 53 and move downward. When the pointer 36 points to the first scale 111, the handle 31 is stopped and the control mechanism 4 is switched to the lower end state. At this time, the valve stem 53 is close to the valve core 51, and the valve core 51 blocks the second sealing port. The valve core mechanism 5 is switched to the B port sealing state (such as Figure 8 As shown), the medium cannot pass through the present invention, and at this time the present invention realizes the function of blocking interface B.

[0053] When the present invention needs to be restored to its initial state, the handle 31 is reversed, and the pointer 36 is driven to rotate, respectively pointing to the first scale 111, the second scale 112, the third scale 113, the fourth scale 114, and the fifth scale 115. Similarly, the control mechanism 4 passes through the lower end state, the vertical state, the inclined state, the horizontal state, and the right end state in sequence. Similarly, the valve core mechanism 5 passes through the B port sealed state, the B port open state, the fully connected state, the A port open state, and the A port sealed state in sequence, thereby restoring the present invention to its initial state and realizing the full function control of the present invention.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A check valve, comprising: A valve body (1) and a valve cover (2), wherein an interface A is provided on the upper right side of the valve body (1), and an interface B is provided on the lower left side of the valve body (1); a valve body cavity is provided inside the valve body (1), a first sealing opening is provided between the valve body cavity and the interface A, and a second sealing opening is provided between the valve body cavity and the interface B; the valve cover (2) is fixedly arranged above the valve body (1) to block the valve body cavity; the valve body cavity is characterized in that it also includes: a transmission mechanism (3), a control mechanism (4) and a valve core mechanism (5); The valve core mechanism (5) is arranged in the valve body cavity, the valve core mechanism (5) cooperates with the first sealing port or the second sealing port, and the valve core mechanism (5) can be switched between the A port sealed state, the A port open state, the full connection state, the B port open state and the B port sealed state; The control mechanism (4) is arranged in the valve body cavity, the control mechanism (4) cooperates with the valve cover (2), and the control mechanism (4) can be switched among a right end state, a horizontal state, an inclined state, a vertical state and a lower end state; The transmission mechanism (3) is arranged in the valve body cavity and is used to drive the control mechanism (4) to switch the state; When the valve core mechanism (5) is switched to the A-port sealing state, the valve core mechanism (5) blocks the first sealing port; when the valve core mechanism (5) is switched to the A-port passing state, the valve core mechanism (5) allows the medium to flow unidirectionally from the interface A to the interface B; when the valve core mechanism (5) is switched to the full-pass state, the medium can flow between the interface A and the interface B; when the valve core mechanism (5) is switched to the B-port passing state, the valve core mechanism (5) allows the medium to flow unidirectionally from the interface B to the interface A; when the valve core mechanism (5) is switched to the B-port sealing state, the valve core mechanism (5) blocks the second sealing port; When the control mechanism (4) is in the right end state, the valve core mechanism (5) switches to the A port sealing state; when the control mechanism (4) is in the horizontal state, the valve core mechanism (5) switches to the A port connecting state; when the control mechanism (4) is in the inclined state, the valve core mechanism (5) switches to the full connecting state; when the control mechanism (4) is in the vertical state, the valve core mechanism (5) switches to the B port connecting state; when the control mechanism (4) is in the lower end state, the valve core mechanism (5) switches to the B port sealing state.

2. A check valve according to claim 1, characterized in that: A valve cover groove is provided on the lower side of the valve cover (2), and a horizontal track groove (211), an arcuate track groove (212) and a vertical track groove (213) are respectively provided on the inner wall on the front side of the valve cover groove, and one end of the arcuate track groove (212) is connected to the left end of the horizontal track groove (211), and the other end is connected to the upper end of the vertical track groove (213).

3. A check valve according to claim 2, characterized in that: A dial (11) is provided on the front side of the valve body (1), and a first scale (111), a second scale (112), a third scale (113), a fourth scale (114) and a fifth scale (115) are respectively provided on the dial (11) along a circumferential direction.

4. A check valve according to claim 3, characterized in that: The transmission mechanism (3) comprises: a handle (31), a worm (32), a worm wheel (33), a first gear (34), a second gear (35) and a pointer (36); The worm wheel (33) is rotatably disposed in the valve body cavity; The worm (32) is rotatably arranged on the valve cover (2), the lower side of the worm (32) is meshed with the worm wheel (33), and the upper side passes through the valve cover (2); The handle (31) and the upper end of the worm (32) are fixedly connected; The first gear (34) is rotatably disposed in the valve body cavity, and the first gear (34) and the worm gear (33) are fixedly connected; The pointer (36) is rotatably arranged on the front side of the scale plate (11), and the pointer (36) and the worm gear (33) are fixedly connected; The second gear (35) is rotatably disposed in the valve body cavity, and the second gear (35) is meshed with the first gear (34).

5. A check valve according to claim 4, characterized in that: The control mechanism (4) comprises: a first swing rod (41), a second swing rod (42) and a control rod (43); One end of the first swing rod (41) is fixedly connected to the second gear (35), and a first swing groove (411) is axially provided on the first swing rod (41); One end of the second swing rod (42) is rotatably disposed in the valve cover groove, and a second swing groove (421) is axially provided on the second swing rod (42); The control rod (43) is slidably arranged between the first swing rod (41) and the second swing rod (42); a control slider (431) is arranged at the front side of the control rod (43); the control slider (431) is slidably arranged in the second swing groove (421); a first control pin (432) is arranged at the front side of the control slider (431); the first control pin (432) can slide along the horizontal track groove (211), the arc track groove (212) and the vertical track groove (213); a second control pin (433) is arranged at the rear side of the control rod (43); the second control pin (433) and the first control pin (432) are coaxial; the second control pin (433) is slidably arranged in the first swing groove (411).

6. A check valve according to claim 5, characterized in that: The valve core mechanism (5) comprises: a valve core (51), a valve stem (52) and a valve core spring (53); One end of the valve stem (52) is fixedly connected to one end of the control rod (43); The valve core (51) is axially slidably disposed at the other end of the valve stem (52), and the valve core (51) can cooperate with the first sealing port or the second sealing port to form a seal; The valve core spring (53) is arranged in the valve stem (52) and is used to drive the valve core (51) to move in a direction away from the valve stem (52).

7. A check valve according to claim 6, characterized in that: When the control mechanism (4) is in a lower end state, the pointer (36) points to a first scale (111); when the control mechanism (4) is in a vertical state, the pointer (36) points to a second scale (112); when the control mechanism (4) is in an inclined state, the pointer (36) points to a third scale (113); when the control mechanism (4) is in a horizontal state, the pointer (36) points to a fourth scale (114); and when the control mechanism (4) is in a right end state, the pointer (36) points to a fifth scale (115).

8. A check valve according to claim 7, characterized in that: The width of the control sliding block (431) is equal to the width of the second swinging groove (421), and the control rod (43) and the second swinging rod (42) cannot rotate relative to each other.

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