Parallel wedge double disc gate valve

Abstract

The present invention discloses a parallel wedge-type double-disc gate valve, in which the sealing plate 1 and sealing plate 2 of the gate assembly are arranged in the inner ring surface of the gate ring, the center of the upper end of the outer ring surface of the gate ring is fixedly connected to the valve stem, and the center of the lower end of the outer ring surface of the gate ring is penetrated by a gear shaft, and sealing plate 1 and sealing plate 2 are both provided with a rack, and both racks are matched with the gear shaft arranged between sealing plate 1 and sealing plate 2; a swing cylinder is installed at the lower part of the valve body and is linked to the gear shaft, and the swing cylinder drives the gear shaft to rotate so as to cause sealing plate 1 and sealing plate 2 to move toward or away from each other at the same time. The present invention utilizes a swing cylinder to drive sealing plate 1 and sealing plate 2 to seal with valve seat 1 and valve seat 2 through a gear rack mechanism to close the gate valve, drive sealing plate 1 and sealing plate 2 to separate the clearance with valve seat 1 and valve seat 2 and use a telescopic cylinder to drive the gate assembly to move to open the gate valve; it solves the problem that the switching torque of the flat gate valve is large and the service life of the valve is short; it also solves the problem that it is not suitable for the needs of the automatic control system.

Description

Technical Field

[0001] The present invention relates to a valve, and more particularly to a parallel wedge-type double-disc gate valve. Background Art

[0002] Gate valves are widely used in pipelines across the petroleum, chemical, pharmaceutical, metallurgical, coal, power, and urban water supply and drainage industries to control and shut off the flow of media. They are one of the most widely used valves in various fluid transportation projects. A gate valve is an opening and closing component whose disc moves vertically along its center, opening when it moves upward and closing when it moves downward. Currently, most flat-plate gate valves maintain contact between the valve seat and the disc's sealing surface during the opening and closing process. This means that each time the valve opens and closes, the sealing surfaces of the valve seat and disc are constantly rubbing against each other, resulting in a high opening and closing torque, accelerated wear on the valve seat and disc, and a shortened valve lifespan. Authorization Publication No. CN 110397749 B, "A Gate Valve," discloses a gate valve that utilizes a reversing valve to control the piston-type valve seat and disc, eliminating friction between the disc and valve core, thereby increasing the valve's service life. The patent's solutions all utilize manual control and are complex in structure, making them unsuitable for automated control systems. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings and deficiencies of the existing technology, and to provide a parallel wedge double-disc gate valve that uses a cylinder to control the up and down movement of the gate and a gear rack type left and right telescopic gate structure, which not only reduces the friction between the valve seat and the sealing surface of the gate but also can be applied to the automatic control system.

[0004] The technical solution of the present invention is a parallel wedge-type double-disc gate valve, comprising a telescopic cylinder, a valve body, a valve stem, a valve cover, a sealing packing and a packing pressure plate. Valve seats 1 and 2 are symmetrically arranged inside the valve body along the channel direction with the valve stem as the center. The valve cover is mounted on the valve body through fasteners. The valve stem passes through the valve cover and extends into the valve body. A packing sealing groove coaxial with the valve stem is formed on the valve cover. The sealing packing is embedded in the packing sealing groove to form a sealing fit with the valve stem. The packing pressure plate is connected to the valve cover by fasteners, and the packing pressure plate presses the sealing packing in the packing sealing groove. The telescopic cylinder is mounted on the valve cover, and the piston rod of the telescopic cylinder is linked to the valve stem.

[0005] It also includes a gate assembly and a swing cylinder. The gate assembly includes a gate ring, a sealing plate 1, a sealing plate 2 and a gear shaft. The gate assembly is arranged inside the valve body. The gate ring is an annular ring. The sealing plate 1 and the sealing plate 2 are arranged in the inner ring surface of the gate ring. The center of the upper end of the outer ring surface of the gate ring is fixedly connected to the valve stem. The center of the lower end of the outer ring surface of the gate ring is passed through the gear shaft. The sealing plate 1 and the sealing plate 2 are each provided with a rack, and the two racks are both matched with the gear shaft provided between the sealing plate 1 and the sealing plate 2; the lower part of the valve body is provided with a center hole coaxial with the valve stem, and the gear shaft rotation seal is provided in the lower center hole of the valve body;

[0006] The swing cylinder is installed at the lower part of the valve body and is linked to the gear shaft. The swing cylinder drives the gear shaft to rotate, causing the sealing plate 1 and the sealing plate 2 to move towards or away from each other at the same time.

[0007] A slide groove is also provided in the valve body, which is symmetrically arranged between valve seat 1 and valve seat 2. The gate ring of the gate assembly moves up and down in the slide groove driven by the valve stem driven by the piston cylinder.

[0008] The above technical solution of the parallel wedge-type double-disc gate valve adopts a swing cylinder to drive the sealing plate 1 and sealing plate 2 to seal with the valve seat 1 and valve seat 2 to close the gate valve when the gate assembly is in the valve body channel position, and drives the sealing plate 1 and sealing plate 2 to separate the clearance between the valve seat 1 and valve seat 2 and the telescopic cylinder to drive the gate assembly to move to open the gate valve through the gear rack mechanism; it solves the problem that the sealing surfaces of the valve seat and the gate are always in contact during the opening and closing process of most flat gate valves, that is, each time the valve is opened and closed, the sealing surfaces of the valve seat and the gate are constantly rubbing against each other, resulting in a large switching torque of the valve, and accelerated wear of the valve seat and gate, resulting in a short service life of the valve; the telescopic cylinder is used to lift the gate assembly and the swing cylinder is used to control the separation or contact of the sealing plate 1 and sealing plate 2 with the valve seat 1 and valve seat 2, and the pneumatic control system can be used to realize the opening and closing of the gate valve, which also solves the problem that the existing gate valve is manually controlled and has a complex structure and is not suitable for the needs of the automatic control system.

[0009] The cam is provided with a plurality of sealing rings, each of which is provided with a plurality of sealing rings, and the plurality of sealing rings are provided with a plurality of sealing rings.

[0010] When the center of the gate ring is consistent with the position of the internal channel of the valve body, the swing cylinder drives the gear shaft to swing so that the sealing plate 1 and the sealing plate 2 are separated into place, and the sealing plate 1 is in close contact with the valve seat 1 on the left side of the valve body. At the same time, the sealing plate 1 pushes the movable sealing seat 1 to move left and compresses the disc spring until the sealing plane 1 of the movable sealing surface 1 is flush with the valve seat 1 on the left side of the valve body, and the sealing plane 1 of the movable sealing seat 1 is in close contact with the sealing plate 1; the sealing plate 2 is in close contact with the valve seat 2 on the right side of the valve body, and at the same time, the sealing plate 2 pushes the movable sealing seat 2 to move right and compresses the disc spring until the sealing plane 2 of the movable sealing surface 2 is flush with the valve seat 2 on the right side of the valve body, and the sealing plane 2 of the movable sealing seat 2 is in close contact with the sealing plate 2;

[0011] When the center of the gate ring is consistent with the internal channel of the valve body, the swing cylinder drives the gear shaft to swing so that the sealing plate 1 and the sealing plate 2 are close to each other, and the clearances of the sealing plate 1 and the sealing plate 2 are matched, and the clearance of the sealing plate 1 and the valve seat 1 on the left side of the valve body are matched, and at the same time, the sealing plane 1 of the movable sealing seat 1 is matched with the clearance of the sealing plate 1; the clearance of the sealing plate 2 and the valve seat 2 on the right side of the valve body are matched, and at the same time, the sealing plane 2 of the movable sealing seat 2 is matched with the clearance of the sealing plate 2; under the elastic force of the disc spring, the sealing plane 1 of the movable sealing seat 1 exceeds the position of the valve seat 1 and is close to the center of the valve body, and under the elastic force of the disc spring, the sealing plane 2 of the movable sealing seat 2 exceeds the position of the valve seat 2 and is close to the center of the valve body.

[0012] The above technical solution further enhances the reliability of the gate valve closing by achieving sealing cooperation with the gate valve assembly when the gate valve is closed through the elastic action of the disc spring by the movable sealing seat 1 and the movable sealing seat 2. At the same time, it also realizes the function of separating the movable sealing seat 1 and the movable sealing seat 2 from the gate valve assembly when the gate valve is opened, ensuring that no friction is generated between the gate valve assembly and the sealing seat 1, the movable sealing seat 2, the valve seat 1 and the valve seat 2, thereby achieving the reliability and long life of the gate valve.

[0013] Further, the sealing plate 1 is provided with a guide column 1 and a guide groove 1, and the sealing plate 2 is provided with a guide column 2 and a guide groove 2, the guide groove 1 is in sliding fit with the guide column 2, and the guide groove 2 is in sliding fit with the guide column 1.

[0014] In the above technical solution, the guiding cooperation of the sealing plate 1 and the sealing plate 2 is achieved through the sliding cooperation of the guide column and the guide groove, and the sealing plate 1 and the sealing plate 2 can use the same parts, thereby reducing the types of parts.

[0015] It further includes a sealing ring 2, a sealing ring groove 2 is provided on the gear shaft, and the gear shaft is sealed with the center hole at the lower part of the valve body through the sealing ring 2 in the sealing ring groove 2.

[0016] The above technical solution provides a specific structure for sealing the gear shaft and the valve body, thereby realizing a rotary seal between the gear shaft and the valve body.

[0017] It further includes a limit plate, which is fixed to the middle part of the gear shaft. A limit groove is also provided at the center hole position of the lower outer surface of the valve body. The limit plate is swingably provided in the limit groove. A first limit boss is provided on the circumference of the limit plate, and a second limit boss is provided on the inner circumferential wall of the limit groove.

[0018] The swing cylinder drives the gear shaft to swing so that the sealing plate 1 and the sealing plate 2 are separated into place, and the clearance between the limit boss 1 and the limit boss 2 does not restrict the cylinder from continuing to swing; the swing cylinder drives the gear shaft to swing so that the sealing plate 1 and the sealing plate 2 are close to the place, and the limit boss 1 and the limit boss 2 fit together to restrict the cylinder from continuing to swing.

[0019] The above technical solution sets a limit plate on the gear shaft, and limits the swing range of the cylinder through the cooperation of the limit plate and the limit groove of the valve body, so that the swing cylinder drives the gear shaft, and then the gear shaft drives the sealing plate 1 and sealing plate 2 to meet the opening and closing function of the gate valve.

[0020] The swing angle of the further swing cylinder is between 15-30 degrees.

[0021] The swing angle of the swing cylinder in the above technical solution is between 15-30 degrees, which can meet the coordination between the gate valve assembly and valve seat 1, valve seat 2, movable sealing seat 1 and movable sealing seat 2. The sizes of various components of the gate valve are appropriate and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, without inventive work, other drawings derived from these drawings still fall within the scope of the present invention.

[0023] Figure 1Schematic diagram of the structure of the parallel wedge double-disc gate valve of the present invention;

[0024] Figure 2 Schematic diagram of the gear shaft of the parallel wedge-type double-disc gate valve of the present invention rotating counterclockwise;

[0025] Figure 3 Schematic diagram of the gear shaft of the parallel wedge-type double-disc gate valve of the present invention rotating clockwise;

[0026] Figure 4 Bottom view of the parallel wedge double-disc gate valve of the present invention (without showing the swing cylinder);

[0027] Figure 5 Schematic diagram of the gate assembly structure;

[0028] Figure 6 A three-dimensional diagram of the cover plate;

[0029] Figure 7 Stereoscopic view of the gate ring;

[0030] Figure 8 A three-dimensional diagram of the movable sealing seat;

[0031] In the figure, 1. telescopic cylinder; 2. coupling; 3. packing pressure plate; 4. sealing packing; 5. valve cover; 51. packing sealing groove; 6. valve stem; 7. movable sealing seat 1; 71. outer ring surface; 72. sealing groove; 73. sealing plane 1; 74. step surface; 8. sealing ring; 9. disc spring; 10. retaining ring; 11. valve body; 111. hole wall; 112. boss; 113. valve seat 2; 114. valve seat 1; 115. center hole; 116. slide groove; 117. limit groove; 1171 , limiting boss two; 118, annular groove; 12, sealing ring two; 13, limiting plate; 131, limiting boss one; 14, swing cylinder; 15, movable sealing seat two; 16, gate assembly; 161, sealing plate one; 1611, guide groove one; 1612, rack; 1613, guide column one; 162, gate ring; 1621, inner annular surface; 1622, through hole; 1623, outer annular surface of the gate ring; 163, sealing plate two; 164, gear shaft; 1641, sealing ring groove two. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0033] Figures 1 to 8The embodiment of the parallel wedge double-disc gate valve of the present invention shown in the figure comprises a telescopic cylinder 1, a coupling 2, a packing pressure plate 3, a sealing packing 4, a valve cover 5, a valve stem 6, a movable sealing seat 1 7, a sealing ring 8, a disc spring 9, a retaining ring 10, a valve body 11, a sealing ring 2 12, a limit plate 13, a movable sealing seat 2 15, a swing cylinder 14 and a gate assembly 16. The valve body 11 is internally provided with a valve seat 1 114 and a valve seat 2 113 symmetrically along the channel direction with the valve stem 6 as the center. The valve cover 5 is tightened by The hardware is installed on the valve body 11. The valve stem 6 passes through the valve cover 5 and extends into the interior of the valve body 11. The valve cover 5 is provided with a packing sealing groove 51 coaxial with the valve stem 6. The sealing packing 4 is embedded in the packing sealing groove 51 to form a sealing fit with the valve stem 6. The packing pressure plate 3 is connected to the valve cover 5 by fasteners, and the packing pressure plate 3 presses the sealing packing 4 in the packing sealing groove 51. The telescopic cylinder 1 is installed on the valve cover 5, and the piston rod of the telescopic cylinder 1 is linked to the valve stem 6 via the coupling 2.

[0034] The gate assembly 16 includes a gate ring 162, a sealing plate 161, a sealing plate 2 163 and a gear shaft 164. The gate assembly 16 is arranged inside the valve body 11. The gate ring 162 is an annular ring. The sealing plate 161 and the sealing plate 2 163 are arranged in the inner ring surface 1621 of the gate ring 162. The center of the upper end of the outer ring surface 1623 of the gate ring is fixedly connected to the valve stem 6. The center of the lower end of the outer ring surface 1623 of the gate ring is provided with a through hole 1622 through which the gear shaft 164 passes. The sealing plate 1 161 is provided with a guide column 1613 and a guide groove 1611, and the sealing plate 2 163 is provided with a guide column 2 and a guide groove 2. The guide groove 1611 is in a sliding fit with the guide column 2, and the guide groove 2 is in a sliding fit with the guide column 1. The sealing plate 1 161 and the sealing plate 2 163 have the same parts and are provided with a rack 1612 to cooperate with the gear shaft 164 arranged between the sealing plate 1 161 and the sealing plate 2 163.

[0035] A center hole 115 coaxial with the valve stem 6 is provided at the lower part of the valve body 11, and a sealing ring groove 1641 is provided on the gear shaft 164. The gear shaft 164 is sealed with the center hole 115 at the lower part of the valve body 11 through the sealing ring 12 in the sealing ring groove 1641; the gear shaft 164 is rotary sealed and arranged in the center hole 115 at the lower part of the valve body 11; a slide groove 116 is also provided in the valve body 11, and the slide groove 116 is symmetrically arranged between the valve seat 114 and the valve seat 2 113. The gate ring 162 of the gate assembly 16 moves up and down in the slide groove 116 driven by the valve stem 6 driven by the piston cylinder.

[0036] The movable sealing seat 1 7 and the movable sealing seat 2 15 are the same annular parts. The outer annular surface 71 of the movable sealing seat 1 7 and the movable sealing seat 2 15 is provided with a sealing groove 72. The movable sealing seat 1 7 and the movable sealing seat 2 15 slide and seal with the hole wall 111 of the internal channel of the valve body 11 through the sealing ring 8 in the sealing groove 72; the right side of the movable sealing seat 1 7 is provided with a sealing plane 1 73, and the left side of the movable sealing seat 2 15 also has a sealing plane 2 which is the same as the sealing plane 1 73. The sealing plane 1 73 and the sealing plane 2 face the gate assembly 16. Annular grooves 118 are also provided on the hole wall 111 of the internal passage of the valve body 11 on the left and right sides. Retaining rings 10 are provided in each of the annular grooves 118. Disc springs 9 are provided between the left retaining ring 10 and the movable sealing seat 1 7 and between the right retaining ring 10 and the movable sealing seat 2 15. Bosses 112 are provided at the valve seat 1 114 and valve seat 2 113 positions of the internal passage of the valve body 11. The sealing seat 1 7 and the movable sealing seat 2 15 are provided with corresponding step surfaces 74. The bosses 112 limit the movable sealing seat 1 7 and the movable sealing seat 2 15 from moving toward the gate assembly 16.

[0037] The limiting piece 13 is fixed to the middle part of the gear shaft 164. A limiting groove 117 is also provided at the position of the center hole 115 on the lower outer surface of the valve body 11. The limiting piece 13 is swingably provided in the limiting groove 117. A limiting boss 131 is provided on the circumference of the limiting piece 13. A limiting boss 2 1171 is provided on the inner circumferential wall of the limiting groove 117.

[0038] The swing cylinder 14 is installed at the lower part of the valve body 11 and is connected to drive the gear shaft 164 to swing; during the opening and closing process of the gate valve, the gear shaft 164 and the gears of the sealing plate 1 161 and the sealing plate 2 163 maintain transmission cooperation.

[0039] The swing cylinder 14 drives the gear shaft 164 to swing so that the sealing plate 161 and the sealing plate 2 163 are separated into place, and the clearance between the limiting boss 1 131 and the limiting boss 2 1171 does not restrict the cylinder from continuing to swing; the swing cylinder 14 drives the gear shaft 164 to swing so that the sealing plate 161 and the sealing plate 2 163 are close to place, and the limiting boss 1 131 and the limiting boss 2 1171 fit together to restrict the cylinder from continuing to swing.

[0040] When the center of the gate ring 162 is consistent with the position of the internal channel of the valve body 11, the swing cylinder 14 drives the gear shaft 164 to swing so that the sealing plate 161 and the sealing plate 2 163 are separated into place, and the sealing plate 161 is in a sealed fit with the valve seat 114 on the left side of the valve body 11. At the same time, the sealing plate 161 pushes the movable sealing seat 17 to move left and compresses the disc spring 9 until the sealing plane 173 of the movable sealing surface 1 is flush with the valve seat 114 on the left side of the valve body 11, and the sealing plane 173 of the movable sealing seat 17 is in a sealed fit with the sealing plate 161; the sealing plate 2 163 is in a sealed fit with the valve seat 2 113 on the right side of the valve body 11, and at the same time, the sealing plate 2 163 pushes the movable sealing seat 2 15 to move right and compresses the disc spring 9 until the sealing plane 2 of the movable sealing surface 2 is flush with the valve seat 2 113 on the right side of the valve body 11, and the sealing plane 2 of the movable sealing seat 2 15 is in a sealed fit with the sealing plate 2 163; in this way, the gate valve is closed.

[0041] When the center of the gate ring 162 is consistent with the internal channel of the valve body 11, the swing cylinder 14 drives the gear shaft 164 to swing so that the sealing plate 161 and the sealing plate 2 163 are close to their position, and the sealing plate 161 and the sealing plate 2 163 are gap-matched, and the sealing plate 161 and the valve seat 114 on the left side of the valve body 11 are gap-matched, and at the same time, the sealing plane 173 of the movable sealing seat 17 is gap-matched with the sealing plate 161; the sealing plate 2 163 and the valve seat 2 113 on the right side of the valve body 11 are gap-matched, and at the same time, the sealing plane 2 of the movable sealing seat 2 15 is gap-matched with the sealing plate 2 163; under the elastic force of the disc spring 9, the sealing plane 173 of the movable sealing seat 17 exceeds the position of the valve seat 114 and is close to the center of the valve body 11, and under the elastic force of the disc spring 9, the sealing plane 2 of the movable sealing seat 2 15 exceeds the position of the valve seat 2 113 and is close to the center of the valve body 11; at this time, the telescopic cylinder 1 drives the gate assembly 16 to move up through the valve stem 6 to open the gate valve.

[0042] The swing angle of the swing cylinder 14 is optimally selected to be between 15 and 30 degrees.

[0043] The parallel wedge-type double-disc gate valve of the present invention adopts a swing cylinder that drives sealing plate 1 and sealing plate 2 to seal with valve seat 1 and valve seat 2 through a gear rack mechanism to close the gate valve when the gate assembly is in the valve body channel position, and drives sealing plate 1 and sealing plate 2 to separate clearance from valve seat 1 and valve seat 2 through a gear rack mechanism and a telescopic cylinder to drive the gate assembly to move to open the gate valve; the movable sealing seat 1 and movable sealing seat 2 are sealed with the gate valve assembly under the elastic action of the disc spring when the gate valve is closed, thereby further enhancing the reliability of the gate valve closing, and also realizing the separation of movable sealing seat 1 and movable sealing seat 2 from the gate valve assembly when the gate valve is open. function; it solves the problem that the sealing surfaces of the valve seat and the gate are always in contact during the opening and closing process of most flat gate valves, that is, each time the valve is opened and closed, the sealing surfaces of the valve seat and the gate are constantly rubbing against each other, resulting in a large switching torque of the valve, and accelerating the wear of the valve seat and the gate, resulting in a short service life of the valve; the telescopic cylinder is used to lift the gate assembly and the swing cylinder is used to control the separation or contact of the sealing plate 1 and the sealing plate 2 with the valve seat 1 and the valve seat 2, and the pneumatic control system can be used to realize the opening and closing of the gate valve, which also solves the problem that the existing gate valve is manually controlled and has a complex structure and is not suitable for the needs of the automatic control system.

[0044] The above disclosure is merely a preferred embodiment of the present invention, and therefore the scope of the present invention cannot be limited by the embodiment. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A parallel wedge-type double-disc gate valve comprising a telescopic cylinder, a valve body, a valve stem, a valve cover, a sealing packing, and a packing pressure plate. A first valve seat and a second valve seat are symmetrically arranged inside the valve body along the channel direction with the valve stem as the center. The valve cover is mounted on the valve body via fasteners. The valve stem passes through the valve cover and extends into the valve body. A packing sealing groove coaxial with the valve stem is defined on the valve cover. The sealing packing is embedded in the packing sealing groove to form a sealing fit with the valve stem. The packing pressure plate is connected to the valve cover via fasteners, and the packing pressure plate presses the sealing packing in the packing sealing groove. The telescopic cylinder is mounted on the valve cover, and the piston rod of the telescopic cylinder is linked to the valve stem. The invention is characterized in that: It also includes a gate assembly and a swing cylinder, the gate assembly includes a gate ring, a sealing plate 1, a sealing plate 2 and a gear shaft, the gate assembly is arranged inside the valve body, the gate ring is an annular ring, the sealing plate 1 and the sealing plate 2 are arranged in the inner ring surface of the gate ring, the center of the upper end of the outer ring surface of the gate ring is connected to the valve stem, the center of the lower end of the outer ring surface of the gate ring is passed through the gear shaft, the sealing plate 1 and the sealing plate 2 are each provided with a rack, and the two racks are both matched with the gear shaft provided between the sealing plate 1 and the sealing plate 2; the lower part of the valve body is provided with a center hole coaxial with the valve stem, and the gear shaft rotation seal is provided in the lower center hole of the valve body; The swing cylinder is installed at the lower part of the valve body and is linked to the gear shaft. The swing cylinder drives the gear shaft to rotate to cause the sealing plate 1 and the sealing plate 2 to move towards or away from each other at the same time. A slide groove is further provided in the valve body, and the slide groove is provided between the first valve seat and the second valve seat. The gate ring of the gate assembly moves up and down in the slide groove driven by the valve stem driven by the piston cylinder.

2. The parallel wedge double-disc gate valve according to claim 1, characterized in that: The cam is provided with a plurality of sealing rings, and the outer ring of the movable sealing seat is provided with a sealing groove, and the movable sealing seat is provided with a plurality of sealing rings. The movable sealing seat is provided with a plurality of sealing rings, and the outer ring of the movable sealing seat is provided with a sealing groove. The movable sealing seat is provided with a sealing plane 1 on the right side of the movable sealing seat, and the sealing plane 2 is provided on the left side of the movable sealing seat, and the sealing plane 1 and the sealing plane 2 face the gate assembly; annular grooves are also provided on the left and right sides of the hole wall of the internal channel of the valve body, and the retaining rings are provided in the annular grooves. The disc spring is provided between the left retaining ring and the movable sealing seat 1 and between the right retaining ring and the movable sealing seat 2. The valve seat 1 and the valve seat 2 positions of the internal channel of the valve body are provided with bosses, and the sealing seat 1 and the movable sealing seat 2 are provided with corresponding step surfaces, and the bosses limit the movable sealing seat 1 and the movable sealing seat 2 from moving toward the gate assembly; When the center of the gate ring is consistent with the position of the internal channel of the valve body, the swing cylinder drives the gear shaft to swing so that the sealing plate 1 and the sealing plate 2 are separated into place, and the sealing plate 1 is in close sealing cooperation with the valve seat 1 on the left side of the valve body. At the same time, the sealing plate 1 pushes the movable sealing seat 1 to move left and compresses the disc spring until the sealing plane 1 of the movable sealing seat 1 is flush with the valve seat 1 on the left side of the valve body, and the sealing plane 1 of the movable sealing seat 1 is in close sealing cooperation with the sealing plate 1; the sealing plate 2 is in close sealing cooperation with the valve seat 2 on the right side of the valve body. At the same time, the sealing plate 2 pushes the movable sealing seat 2 to move right and compresses the disc spring until the sealing plane 2 of the movable sealing seat 2 is flush with the valve seat 2 on the right side of the valve body, and the sealing plane 2 of the movable sealing seat 2 is in close sealing cooperation with the sealing plate 2; When the center of the gate ring is consistent with the position of the internal channel of the valve body, the swing cylinder drives the gear shaft to swing so that the sealing plate 1 and the sealing plate 2 are close to each other, and the sealing plate 1 and the sealing plate 2 are gap-matched, and the sealing plate 1 is gap-matched with the valve seat 1 on the left side of the valve body, and at the same time, the sealing plane 1 of the movable sealing seat 1 is gap-matched with the sealing plate 1; the sealing plate 2 is gap-matched with the valve seat 2 on the right side of the valve body, and at the same time, the sealing plane 2 of the movable sealing seat 2 is gap-matched with the sealing plate 2; under the elastic force of the disc spring, the sealing plane 1 of the movable sealing seat 1 exceeds the position of the valve seat 1 and is close to the center of the valve body, and under the elastic force of the disc spring, the sealing plane 2 of the movable sealing seat 2 exceeds the position of the valve seat 2 and is close to the center of the valve body.

3. The parallel wedge double-disc gate valve according to claim 1, characterized in that: The sealing plate 1 is provided with a guide column 1 and a guide groove 1, and the sealing plate 2 is provided with a guide column 2 and a guide groove 2. The guide groove 1 is in sliding fit with the guide column 2, and the guide groove 2 is in sliding fit with the guide column 1.

4. The parallel wedge double-disc gate valve according to any one of claims 1 to 3, characterized in that: It also includes a second sealing ring. A second sealing ring groove is provided on the gear shaft. The gear shaft is sealed and matched with the center hole at the lower part of the valve body through the second sealing ring in the second sealing ring groove.

5. The parallel wedge double-disc gate valve according to claim 4, characterized in that: It also includes a limiting piece, which is fixed to the middle part of the gear shaft. A limiting groove is also provided at the center hole position of the lower outer surface of the valve body. The limiting piece is swingably provided in the limiting groove. A first limiting boss is provided on the circumference of the limiting piece, and a second limiting boss is provided on the inner circumferential wall of the limiting groove. The swing cylinder drives the gear shaft to swing so that the sealing plate 1 and the sealing plate 2 are separated into place, and the clearance fit between the limiting boss 1 and the limiting boss 2 does not restrict the cylinder from continuing to swing; the swing cylinder drives the gear shaft to swing so that the sealing plate 1 and the sealing plate 2 are close to being in place, and the limiting boss 1 and the limiting boss 2 are fitted together to restrict the cylinder from continuing to swing.

6. The parallel wedge double-disc gate valve according to claim 5, characterized in that: The swing range of the swing cylinder is between 15-30 degrees.

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