High-pressure parallel type friction-free double-gate-disc gate valve

Abstract

The invention relates to the field of gate valves, and particularly discloses a high-pressure parallel type friction-free double-gate-plate gate valve which comprises a valve body and two valve seats arranged in the valve body, and further comprises a gate plate frame and two gate plate assemblies arranged on the gate plate frame in a sliding mode. The two flashboard assemblies are located on the two sides of the flashboard frame in the opening and closing direction respectively and used for abutting against different valve seats respectively, a pushing structure is arranged between the flashboard frame and the flashboard assemblies, the flashboard frame drives the flashboard assemblies to move through the pushing structure, and the pushing structure comprises a pushing face and a pushing piece arranged corresponding to the pushing face. The pushing faces are arranged on the gate frame and / or the gate assembly, the distance between the pushing faces of the two pushing structures is decreased progressively in the closing direction, the pushing faces abut against the pushing piece, the pushing piece abuts against the gate frame and the gate assembly, and when the gate assembly abuts against the valve seat, a gap exists between the gate frame and the inner wall of the valve body in the closing direction. The double-gate-plate gate valve has the effect of reducing friction force needing to be overcome when the double-gate-plate gate valve is opened and closed.

Description

Technical Field

[0001] The present application relates to the field of gate valves, and in particular to a high-pressure parallel frictionless double-disc gate valve. Background Art

[0002] Double-disc gate valve is a special type of gate valve with two discs, usually in parallel structure. When the valve is opened and closed, the contact between the disc and the valve seat is more uniform, which can effectively improve the sealing performance.

[0003] In the related art, the two gates of the double-disc gate valve use springs and other mechanisms to generate pre-tightening force, so that the two gates can fit tightly on the valve seat. This results in the need to overcome greater friction when opening and closing the double-disc gate valve, which in turn requires a large torque to operate the double-disc gate valve, affecting the opening and closing operation. At the same time, the seal and the gate are prone to wear, which affects the service life of the valve. Summary of the invention

[0004] In order to reduce the friction force that needs to be overcome when the double-disc gate valve is opened and closed, the present application provides a high-pressure parallel frictionless double-disc gate valve.

[0005] The present application provides a high-pressure parallel frictionless double-disc gate valve adopts the following technical solution: A high-pressure parallel frictionless double-disc gate valve comprises a valve body and two valve seats arranged in the valve body, and also comprises a gate frame and two groups of gate assemblies slidably arranged on the gate frame, the two gate assemblies are respectively located on both sides of the gate frame along the direction of opening and closing, and the two gate assemblies are respectively used to contact with different valve seats, a pushing structure is arranged between the gate frame and the gate assembly, the gate frame drives the gate assembly to move through the pushing structure, the pushing structure comprises a pushing surface and a pushing member arranged corresponding to the pushing surface, the pushing surface is arranged on the gate frame and / or the gate assembly, the spacing between the pushing surfaces of the two pushing structures decreases along the closing direction, the pushing surface contacts the pushing member, the pushing member contacts the gate frame and the gate assembly, and when the gate assembly contacts the valve seat, there is a gap between the gate frame and the inner wall of the valve body along the closing direction.

[0006] By adopting the above technical solution, when the gate valve of the present application is closed, the gate assembly moves together with the gate frame by moving the gate frame in the closing direction. After the gate assembly is aligned with the valve seat, the gate frame continues to move, and the gate frame continues to move in the closing direction, and the gate assembly moves relative to the gate frame. Since the distance between the push surfaces of the two push structures decreases along the closing direction, the gate frame applies force to the push member, and the push member cooperates with the push surface to make the two gate assemblies move back to back, and finally the two gate assemblies collide with different valve seats respectively, so as to achieve the effect of closing different valve seats.

[0007] When the gate valve of the present application is installed with the closing direction downward and the opening direction upward, and the gate frame moves to the opening direction to reset, the gate assembly remains different in the opening and closing directions under the action of gravity, and the gate frame and the gate assembly move relative to each other in the opening and closing directions. Similar to the closing, under the action of the pusher and the push surface, the two gate assemblies move toward each other, so that the gate assembly is separated from the valve seat. After the gate frame moves relative to the gate assembly in the opening and closing direction to the maximum distance, the gate assembly moves together with the gate frame, thereby completely opening the gate.

[0008] Compared with applying pre-tightening force to the gate plate through a spring, such a setting does not cause the gate plate assembly and the valve seat to move in the direction of opening and closing when they are pressed against each other, whether closing or opening. That is, the movement of the gate plate assembly when pressing against the valve seat is eliminated, thereby eliminating the related friction. The wear of the valve seat and the gate plate assembly is avoided as much as possible, and the torque required to open and close the gate valve of the present application is greatly reduced, which is helpful for the opening and closing operation.

[0009] Optionally, the gate assembly includes an extension piece, and a connecting piece is provided on the gate frame corresponding to the extension piece, one end of the connecting piece is connected to the gate frame, and the other end of the connecting piece is located on the side of the extension piece away from the gate frame and is used to interfere with the extension piece.

[0010] By adopting the above technical solution, when the gate frame and the gate assembly are connected, the connecting piece is installed on the gate frame, and one end of the connecting piece blocks and limits the extension piece, so that the gate assembly and the gate frame can be connected, and the gate assembly can slide relative to the gate frame. Such a setting has a simple structure and is easy to install.

[0011] Optionally, the gate assembly further includes a gate body for abutting against the valve seat, and the extension piece is connected to the gate body.

[0012] By adopting the above technical solution, an extension piece is added to the gate body, and the extension piece is used as an extension of the gate body to connect with the gate frame. Compared with the integral molding of the extension piece and the gate body, the difficulty of processing and molding is greatly reduced, and it is convenient to connect the gate assembly with the gate frame.

[0013] Optionally, it also includes a connection limit assembly slidably arranged on the gate frame along the direction of opening and closing, the connection limit assembly includes a connection seat and a limit rod connected to the connection seat, the two gate assemblies are slidably arranged on the connection seat along the arrangement direction of the two valve seats, the limit rod is used to contact the inner wall of the valve body, and when the limit rod contacts the inner wall of the valve body, the two gate assemblies are aligned with the valve seat By adopting the above technical solution, when the gate frame moves in the closing direction, the connection limit assembly moves together with the gate frame until the limit rod contacts the inner wall of the valve body, and the limit rod restricts the two valve body assemblies from continuing to move in the closing direction through the connection seat, at which time the gate assembly is aligned with the valve seat. Compared with the gate assembly directly contacting the inner wall of the valve body, the friction between the gate assembly and the inner wall of the valve body can be effectively avoided, and the friction of the gate assembly during opening and closing is further reduced.

[0014] Optionally, an elastic member is provided between the two gate assemblies, and the elastic member is used to apply a force to the two gate assemblies to drive the two gate assemblies to move toward each other.

[0015] By adopting the above technical solution, when the gate is opened, the elastic member always applies a force to the gate assembly to drive the two gate assemblies to move toward each other, so that the gate frame is reset in the direction of opening the gate, and the two gate assemblies can stably move toward each other. And when the gate is closed, the relative position of the gate assembly and the gate frame can remain stable.

[0016] The upright installation of the gate valve means that the closing direction of the gate valve is vertically downward and the opening direction is vertically upward. In addition to the upright installation of the gate valve, the gate valve can be installed in other installation situations, such as inverted installation with the closing direction vertically upward and the opening direction vertically downward, or directional installation with the gate opening and closing in the horizontal direction. The elastic parts can effectively ensure that the gate assembly is recovered and reset, and the relative position between the gate assembly and the gate seat is stable before closing, that is, even if the gate assembly is aligned with the valve seat before closing, there is still a gap between the gate assembly and the valve seat.

[0017] Optionally, an elastic member is provided on the gate frame, and the elastic member is retracted and retracted in the direction of opening and closing. The two ends of the elastic member are pressed against the gate frame and the connection limit assembly. The elastic member is used to apply a force to the gate frame to drive the gate frame to move in the opening direction, and the elastic member is used to apply a force to the connection limit assembly to drive the connection limit assembly to move in the closing direction.

[0018] By adopting the above technical solution, on the one hand, compared with installing elastic parts that apply pulling forces to the two gate assemblies, elastic parts that apply a clamping force to the gate frame and the connection limit assembly are easier to install, and no additional connection structure is required; on the other hand, compared with applying force to the gate assembly to move the gate assembly relative to the gate seat, the applied force still needs to be transmitted through the pushing structure, which is prone to jamming. Since the connection limit assembly and the gate seat are relatively integrated, directly applying force to the connection limit assembly and the gate seat can be converted into applying force to the gate assembly and the gate frame, that is, directly driving the gate assembly and the gate seat to move in opposite directions in the direction of opening and closing, and jamming is not easy to occur.

[0019] Optionally, the pushing member is a ball bearing, and there is a gap between the gate frame and the gate assembly.

[0020] By adopting the above technical solution, there is a gap between the gate frame and the gate assembly, which effectively reduces the contact area. The sliding friction is converted into rolling friction in the form of balls. This combination further reduces the friction force that needs to be overcome when opening and closing the gate, thereby reducing the torque required to be output when opening and closing the gate.

[0021] Optionally, the pushing structure further includes a limiting groove, which is provided on the gate assembly and / or the gate frame, and the end of the pushing member is located in the limiting groove.

[0022] By adopting the above technical solution, the limiting groove limits the installation of the pusher, which can effectively ensure that the pusher and the gate frame and the gate assembly are in direct contact and fit, and facilitates the installation of the pusher.

[0023] Optionally, the pushing structure further includes a rolling groove corresponding to the limiting groove, the rolling groove is located in the rolling groove and the rolling groove along both ends of the pushing member, and the pushing surface is the groove wall of the rolling groove; When the limit groove is provided on the gate assembly, the corresponding rolling groove is provided on the gate frame; When the limiting groove is provided on the gate frame, the corresponding rolling groove is provided on the gate assembly.

[0024] By adopting the above technical solution, compared with the pusher directly rolling against the gate frame or gate assembly, the rolling groove and the limit groove are added to cooperate, which can guide the rolling of the pusher on the one hand, and further limit the pusher on the other hand, and the combination improves the stability of the gate assembly when it slides relative to the gate frame.

[0025] Optionally, a guide groove extending along the opening and closing direction is provided on the inner wall of the valve body, and the end of the gate frame is inserted into the guide groove.

[0026] By adopting the above technical solution, the guide groove guides the gate frame to slide along the opening and closing direction, which can improve the stability of the gate assembly during opening and closing.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: By pushing the structure, the gate assembly is first aligned with the valve seat and then contacts the valve seat during the closing process of the gate frame. The gate assembly is first separated from the valve seat and then staggered from the valve seat during the opening process of the gate assembly. Compared with the double-gate gate valve in the prior art in which the gate and the valve seat are tightly pressed by the spring, the gate valve of the present application effectively avoids friction between the gate assembly and the valve seat during the closing and opening process, thereby avoiding wear of the gate assembly and the valve seat caused by the friction between the gate assembly and the valve seat, and greatly reduces the torque required for the closing and opening process. The pusher is set in the form of a ball, which converts sliding friction into rolling friction, further reducing the torque required for opening and closing the switch; Connect the limit assembly to limit the gate assembly, so as to avoid the gate assembly from contacting the inner wall of the valve body and ensure that the gate assembly can be aligned with the valve seat; The addition of elastic parts ensures that the gate valve of the present application remains separated before the gate assembly is aligned with the valve seat under different installation conditions. When opening the gate, the gate assembly is first separated from the valve seat before moving in the opening direction, thereby improving the installation adaptability of the gate valve of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application.

[0029] Figure 2 It is a schematic diagram of the partial structure in which the valve body is removed in an embodiment of the present application.

[0030] Figure 3 It is a cross-sectional view of an embodiment of the present application.

[0031] Figure 4 yes Figure 3 A magnified schematic diagram of center A.

[0032] Figure 5 It is a cross-sectional view highlighting the propulsion structure in the embodiment of the present application.

[0033] Figure 6 It is a structural schematic diagram highlighting the pusher and gate assembly in the embodiment of the present application.

[0034] Figure 7 It is a structural schematic diagram highlighting the gate frame and the connection limit assembly in the embodiment of the present application.

[0035] Description of reference numerals: 1. Valve body; 11. Guide structure; 111. Guide block; 112. Guide groove; 2. Valve seat; 3. Gate assembly; 31. Gate body; 311. Connecting groove; 32. Extension piece; 4. Gate frame; 41. Connecting piece; 42. Give way groove; 43. Sliding cavity; 5. Valve stem; 6. Pushing structure; 61. Rolling groove; 62. Limiting groove; 63. Pushing member; 64. Pushing surface; 7. Connecting and limiting assembly; 71. Connecting seat; 72. Limiting rod; 8. Elastic member. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-7 This application is described in further detail.

[0037] The embodiment of the present application discloses a high-pressure parallel frictionless double-disc gate valve.

[0038] Reference Figure 1 , Figure 2 The high-pressure parallel frictionless double-disc gate valve comprises a valve body 1, two valve seats 2 fixed in the valve body 1, two gate assemblies 3 respectively used to contact with different valve seats 2, a gate frame 4 driving the two gate assemblies 3 to move, and a valve stem 5 driving the two gate frames 4 to move.

[0039] Reference Figure 1 , Figure 2 The valve stem 5 is rotatably arranged on the valve body 1 and can slide on the valve body 1 along its own axis. One end of the valve stem 5 is provided with a thread. By arranging a device rotatably sleeved on the valve stem 5 and threadedly connected to the valve stem 5, such as a turntable, the valve stem 5 is driven to rotate and the valve stem 5 is moved along its own axis, that is, moved in the opening and closing direction.

[0040] Reference Figure 2 , Figure 3 The gate frame 4 is slidably arranged in the valve body 1, and the valve stem 5 is fixedly connected to the gate frame 4. The movement of the valve stem 5 in the opening and closing direction can drive the gate frame 4 to move. Two sets of guide structures 11 are arranged on the inner wall of the valve body 1, and the two sets of guide structures 11 are centrally symmetrical around the axis of the valve stem 5. The guide structure 11 includes two guide blocks 111 integrally formed on the inner wall of the valve body 1, and there is a gap between the two guide blocks 111. The two guide blocks 111 in the same set of guide structures 11 and the inner wall of the valve body 1 form a guide groove 112, and the guide groove 112 extends in the opening and closing direction. The two ends of the gate frame 4 are respectively inserted in different guide grooves 112 and slidably arranged in the guide groove 112 along the extension direction of the guide groove 112.

[0041] Reference Figure 2 , Figure 4 The gate assembly 3 is slidably arranged on the gate frame 4, and two groups of gate assemblies 3 are respectively located on both sides of the gate frame 4 along the gate opening and closing direction, and different gate assemblies 3 are respectively used to contact different valve seats 2. The gate assembly 3 includes a gate body 31 and an extension piece 32 arranged on the gate body 31, and the extension piece 32 is fixed to the gate body 31 by bolts.

[0042] Reference Figure 2, a connecting piece 41 is provided on the gate frame 4 corresponding to the extension piece 32, and each extension piece 32 corresponds to two connecting pieces 41. The two connecting pieces 41 corresponding to the same extension piece 32 are respectively located on both sides of the gate frame 4, and the connecting piece 41 is "L"-shaped. One end of the connecting piece 41 is fixed to the gate frame 4 by bolts, and the other end of the connecting piece 41 is located on the side of the extension piece 32 away from the gate frame 4 and is used to contact the extension piece 32, so as to play the role of connecting the gate assembly 3 and the gate frame 4, and to ensure that the gate assembly 3 can slide relative to the gate frame 4. The gate frame 4 is provided with a clearance groove 42 corresponding to the number of the connecting pieces 41, and the clearance groove 42 is an arc groove, and the groove wall of the clearance groove 42 extends around the axis of the bolt on the gate frame 4 for fixing the connecting piece 41, and the clearance groove 42 extends along the axial direction of the bolt on the gate frame 4 for fixing the connecting piece 41. Such an arrangement makes room for the worker to use a tool to rotate the bolts for fixing the connecting piece 41 , thereby facilitating the worker to install the connecting piece 41 .

[0043] Reference Figure 5 , Figure 6 A pushing structure 6 is provided between the gate assembly 3 and the gate frame 4, and the pushing structure 6 includes a rolling groove 61, a limiting groove 62 and a pushing member 63. There are four rolling grooves 61, two of which are provided on the surface of the gate frame 4 facing one of the gate assemblies 3, and the remaining two rolling grooves 61 are provided on the surface of the gate frame 4 facing another gate assembly 3, and the rolling grooves 61 opened on different surfaces of the gate frame 4 are symmetrically arranged. The limiting grooves 62 are provided corresponding to the rolling grooves 61, and one rolling groove 61 corresponds to two limiting grooves 62, that is, there are eight limiting grooves 62, four of which are opened on the end surface of one gate body 31 facing the gate frame 4, and the remaining four limiting grooves 62 are opened on the end surface of another gate body 31 facing the gate frame 4, and the limiting grooves 62 opened on different gate bodies 31 are symmetrically arranged. The gate body 31 is provided with an end extension piece 32 of the limiting groove 62, and the limiting groove 62 is connected to the corresponding rolling groove 61.

[0044] Reference Figure 5 , Figure 6 The pusher 63 is a ball bearing, and the pusher 63 is arranged corresponding to the limit groove 62. Each limit groove 62 corresponds to three pushers 63. The two ends of the pusher 63 are respectively located in the limit groove 62 and the rolling groove 61 corresponding to the limit groove 62. The rolling groove 61 and the limit groove 62 are both concave arc grooves that fit the pusher 63. The bottom walls of the rolling groove 61 and the limit groove 62 are both push surfaces 64, and the push surfaces 64 are inclined. The spacing between the push surfaces 64 of the two sets of push structures 6 decreases along the closing direction. The pusher 63 and the push surfaces 64 on the rolling groove 61 and the limit groove 62 where its end is located are in conflict, and there is a gap between the gate assembly 3 and the gate frame 4.

[0045] In other embodiments, the rolling groove 61 is also provided on the gate body 31 , and the limiting groove 62 is also correspondingly provided on the gate frame 4 . Any method that can guide and limit the rolling of the pusher 63 is acceptable.

[0046] Reference Figure 4 , Figure 7 , a connection limit assembly 7 is provided on the gate frame 4, and the connection limit assembly 7 includes a connection seat 71 and a limit rod 72. The connection seat 71 is tubular, and the axis of the connection seat 71 is consistent with the flow direction of the fluid, that is, consistent with the arrangement direction of the two valve seats 2. A sliding cavity 43 is penetrated on the gate frame 4 along the arrangement direction of the valve seats 2, and the connection seat 71 is slidably arranged in the sliding cavity 43 along the opening and closing direction. A connection groove 311 is provided on the end surface of the two gate bodies 31 facing the gate frame 4, and the two ends of the connection seat 71 are respectively inserted into the connection grooves 311 of different gate bodies 31, and the two gate bodies 31 can be slidably arranged on the connection seat 71 along the axial direction of the connection seat 71.

[0047] Reference Figure 4 , Figure 7 , one end of the limit rod 72 passes through the connecting seat 71 and is fixedly connected to the connecting seat 71, the other end of the limit rod 72 passes through the gate frame 4, and the limit rod 72 is slidably set on the gate frame 4 along the opening and closing direction. That is, one end of the limit rod 72 is located in the sliding cavity 43, and the other end of the limit rod 72 is located outside the sliding cavity 43. The end of the limit rod 72 outside the sliding cavity 43 is used to contact the inner wall of the valve body 1. When the end of the limit rod 72 outside the sliding cavity 43 contacts the inner wall of the valve body 1, the two gate bodies 31 are aligned with the corresponding valve seats 2, and there is a gap between the gate frame 4 and the inner wall of the valve body 1 along the closing direction. When the gate body 31 contacts the corresponding valve seat 2, there is still a gap between the gate frame 4 and the inner wall of the valve body 1 along the closing direction Reference Figure 1 An elastic member 8 is provided between the two gate assemblies 3. The elastic member 8 is a spring. One end of the elastic member 8 is located in the connection seat 71 and is pressed against the connection seat 71. The other end of the elastic member 8 passes through the outside of the connection seat 71 and is pressed against the gate frame 4. The elastic member 8 is retracted in the direction of opening and closing.

[0048] In other embodiments, the elastic member 8 may also be rubber, etc., and any method that can stretch and contract and apply a force to the connecting seat 71 to drive the connecting seat 71 to move in the closing direction, and apply a force to the gate frame 4 to drive the gate seat to move in the opening direction is acceptable. In other embodiments, the two ends of the elastic member 8 may be directly connected to different gate assemblies 3, respectively, and any method that can apply a force to the two gate assemblies 3 to drive the two gate assemblies 3 to move toward each other is acceptable.

[0049] The implementation principle of a high-pressure parallel frictionless double-disc gate valve in the embodiment of the present application is as follows: when closing the gate, the valve stem 5 is rotated by a rotating disk or the like, and the valve stem 5 drives the gate frame 4 to move along the closing direction. The gate frame 4 drives the two gate assemblies 3 and the connection limit assembly 7 to move together until the limit rod 72 contacts the inner wall of the valve body 1, and at this time, the gate body 31 is aligned with the valve seat 2. The gate frame 4 is continued to be driven to move by the valve stem 5, and under the limiting action of the limit rod 72, the connection seat 71 and the gate assembly 3 no longer move along the opening and closing direction, that is, the connection seat 71 and the gate frame 4 move relative to each other along the opening and closing direction. Through the pushing surface 64 and the pushing member 63, the gate body 31 moves relative to the gate frame 4 along the arrangement direction of the valve seat 2, and the two gate bodies 31 move back to back until the two gates contact different valve seats 2 respectively, that is, the channels in the two valve seats 2 are closed.

[0050] When opening the gate, the valve stem 5 is reversed to drive the gate frame 4 to reset. Under the action of the elastic member 8, the connection limit assembly 7 remains stationary, that is, the gate frame 4 moves relative to the connection limit assembly 7, and the gate frame 4 drives the two gate assemblies 3 to move toward each other through the pushing structure 6, so that the gate body 31 is separated from the valve seat 2, until the gate body 31 contacts the connection seat 71. The gate frame 4 is driven to move by the valve stem 5, and at this time, the connection assembly and the gate assembly 3 move together in the direction of opening the gate. Since the gate body 31 and the valve seat 2 are separated at this time, there is no friction.

[0051] Such a setting can greatly reduce the friction that the double-disc gate valve needs to overcome when opening and closing, is easy to operate, and effectively extends the service life of the valve.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-pressure parallel frictionless double-disc gate valve, comprising a valve body (1) and two valve seats (2) arranged in the valve body (1), characterized in that: It also comprises a gate frame (4) and two groups of gate assemblies (3) slidably arranged on the gate frame (4), the two gate assemblies (3) are respectively located on both sides of the gate frame (4) along the direction of opening and closing the gate, and the two gate assemblies (3) are respectively used to contact different valve seats (2), a pushing structure (6) is arranged between the gate frame (4) and the gate assembly (3), the gate frame (4) drives the gate assembly (3) to move through the pushing structure (6), and the pushing structure (6) comprises a pushing surface (64) and a pushing surface (64) (64) A pushing member (63) is correspondingly arranged, the pushing surface (64) is arranged on the gate frame (4) and / or the gate assembly (3), the distance between the pushing surfaces (64) of the two pushing structures (6) decreases along the closing direction, the pushing surface (64) abuts against the pushing member (63), the pushing member (63) abuts against the gate frame (4) and the gate assembly (3), and when the gate assembly (3) abuts against the valve seat (2), there is a gap between the gate frame (4) and the inner wall of the valve body (1) along the closing direction.

2. A high-pressure parallel frictionless double-disc gate valve according to claim 1, characterized in that: The gate assembly (3) comprises an extension piece (32), and a connecting piece (41) is provided on the gate frame (4) corresponding to the extension piece (32), one end of the connecting piece (41) is connected to the gate frame (4), and the other end of the connecting piece (41) is located on a side of the extension piece (32) away from the gate frame (4) and is used to contact the extension piece (32).

3. A high-pressure parallel frictionless double-disc gate valve according to claim 2, characterized in that: The gate assembly (3) further comprises a gate body (31) for contacting the valve seat (2), and the extension piece (32) is connected to the gate body (31).

4. A high-pressure parallel frictionless double-disc gate valve according to claim 1, characterized in that: It also includes a connection limit assembly (7) slidably arranged on the gate frame (4) along the direction of opening and closing the gate, the connection limit assembly (7) includes a connection seat (71) and a limit rod (72) connected to the connection seat (71), the two gate assemblies (3) are slidably arranged on the connection seat (71) along the arrangement direction of the two valve seats (2), the limit rod (72) is used to contact the inner wall of the valve body (1), and when the limit rod (72) contacts the inner wall of the valve body (1), the two gate assemblies (3) are aligned with the valve seat (2).

5. A high-pressure parallel frictionless double-disc gate valve according to claim 1, characterized in that: An elastic member (8) is provided between the two gate assemblies (3), and the elastic member (8) is used to apply a force to the two gate assemblies (3) to drive the two gate assemblies (3) to move towards each other.

6. A high-pressure parallel frictionless double-disc gate valve according to claim 4, characterized in that: An elastic member (8) is provided on the gate frame (4), and the elastic member (8) is retracted in the direction of opening and closing the gate. Two ends of the elastic member (8) are pressed against the gate frame (4) and the connection limit assembly (7). The elastic member (8) is used to apply a force to the gate frame (4) to drive the gate frame (4) to move in the opening direction, and the elastic member (8) is used to apply a force to the connection limit assembly (7) to drive the connection limit assembly (7) to move in the closing direction.

7. A high-pressure parallel frictionless double-disc gate valve according to claim 1, characterized in that: The pushing member (63) is a ball bearing, and there is a gap between the gate frame (4) and the gate assembly (3).

8. A high-pressure parallel frictionless double-disc gate valve according to claim 7, characterized in that: The pushing structure (6) further comprises a limiting groove (62), wherein the limiting groove (62) is provided on the gate assembly (3) and / or the gate frame (4), and the end of the pushing member (63) is located in the limiting groove (62).

9. A high-pressure parallel frictionless double-disc gate valve according to claim 8, characterized in that: The pushing structure (6) further comprises a rolling groove (61) corresponding to the limiting groove (62), the rolling groove (61) being respectively located in the rolling groove (61) and the rolling groove (61) along two ends of the pushing member (63), and the pushing surface (64) is a groove wall of the rolling groove (61); When the limiting groove (62) is formed on the gate assembly (3), the corresponding rolling groove (61) is formed on the gate frame (4); When the limiting groove (62) is formed on the gate frame (4), the corresponding rolling groove (61) is formed on the gate assembly (3).

10. A high-pressure parallel frictionless double-disc gate valve according to claim 1, characterized in that: A guide groove (112) extending in the opening and closing direction is provided on the inner wall of the valve body (1), and the end of the gate frame (4) is inserted into the guide groove (112).

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