CN116221439A

CN116221439A - Rotary gate valve

Info

Publication number: CN116221439A
Application number: CN202310250628.6A
Authority: CN
Inventors: 陈俊成; 张少波; 王正文
Original assignee: Neway Oil Equipment Suzhou Co ltd
Current assignee: Neway Oil Equipment Suzhou Co ltd
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2023-06-06
Also published as: CN113175539A; CN116221440A; CN113175539B

Abstract

The invention discloses a rotary gate valve, which comprises a valve body, a valve cover, a valve rod penetrating through the valve cover and a valve seat assembly arranged at the lower end part of the valve rod, wherein the valve rod is used for driving the valve seat assembly to rotate, a cavity is arranged between the valve body and the valve cover, and the valve seat assembly is accommodated in the cavity; the valve seat assembly comprises a supporting seat, a channel and a groove which are formed in the supporting seat, and a valve seat which is arranged in the groove, wherein the valve seat comprises a first valve seat and a second valve seat, and two grooves which are respectively used for placing the two valve seats are formed in the supporting seat; a gap is formed between the surface of the valve seat and the surface of the groove. According to the rotary gate valve, the valve seat assembly is fixedly arranged at the lower end of the valve rod, and the channel penetrating through the valve seat assembly in the thickness direction is formed in the valve seat assembly, so that the valve seat assembly can be driven to rotate through rotation of the valve rod, and the channel on the valve seat assembly and the flow channel on the valve body are communicated or staggered with each other, so that the valve is opened and closed.

Description

Rotary gate valve

The present application is a divisional application of the invention patent application with the application date 2021, 4 and 29, the application number 202110473618X and the name of "rotary gate valve".

Technical Field

The invention relates to the technical field of underwater valves, in particular to a rotary gate valve which drives a valve seat assembly to rotate through a valve rod so as to switch a valve.

Background

Most of the existing gate valves are lifting rods or rotary lifting rod structures, and in general, all the existing gate valves are converted into lifting motions of a gate plate and a valve rod through rotary motions. Structurally, the traditional gate valve has the defects of long stroke and high overall height of the valve; in terms of operation, the traditional gate valve has the defects of more rotation operation turns and lower transmission efficiency, and can not meet the requirements of quick opening and closing in actual use. On the other hand, in some special conditions, such as chemical injection or instrumentation valves, and in other underwater environments, the valve needs to meet the requirement of quick opening, which is not met by conventional gate valves.

Disclosure of Invention

In view of the above, it is an object of the present invention to provide a rotary gate valve capable of converting a conventional lifting operation mode into a rotary operation mode while achieving the purpose of rapidly opening and closing the valve, in order to overcome the above-mentioned drawbacks of the prior art.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

the utility model provides a rotary gate valve, includes valve body, valve gap, runs through valve rod and the setting that the valve gap set up are in the disk seat subassembly of valve rod lower tip, the valve rod is used for driving the disk seat subassembly rotates, have the cavity between valve body and the valve gap, the disk seat subassembly holds in the cavity, set up the runner that is used for supplying the fluid circulation on the valve body, the passageway has been seted up on the disk seat subassembly, the passageway runs through the thickness direction of disk seat subassembly, rotary gate valve has open condition and closed condition, under the open condition, runner, passageway and cavity link up each other.

According to some preferred embodiments of the present invention, the valve seat assembly includes a support seat, a channel formed on the support seat, a groove, and a valve seat disposed in the groove, the groove is formed near the valve body, the channel penetrates through the thickness direction of the support seat, an elastic member is disposed between the valve seat and the support seat, and the elastic member is used for providing a trend that the valve seat is attached to the valve body. The elastic piece is used for providing sealing pretightening force, so that the lower surface of the valve seat is always attached to the upper surface of the cavity part formed in the valve body, and the acting force of the elastic piece can play a low-pressure sealing role in the valve closing state. In some embodiments, the resilient member is preferably a cylindrical spring or a disc spring.

The opening state and the closing state of the valve are realized by rotating the valve rod to drive the supporting seat to rotate. When the channel on the supporting seat rotates to the position above the valve body flow channel, the channel and the cavity are communicated with each other, fluid can flow, and the valve is in an open state. When the channel on the supporting seat rotates to be staggered with the valve body flow channel and the valve seat on the supporting seat rotates to be above the valve body flow channel, namely the axial lead of the valve seat is coincident with the axial lead of the flow channel, the valve is completely closed, fluid cannot flow, and the valve is in a closed state.

The valve seat and the valve body are in a metal-metal contact hard sealing mode, so that the sealing surface needs hardening treatment, and the metal-metal hard sealing can effectively ensure the long service life of the underwater gate valve.

According to some preferred embodiments of the present invention, the valve seat includes a lower sealing portion and an upper receiving portion, the sealing portion has a diameter larger than that of the flow passage, and the receiving portion is provided with a receiving groove for receiving the elastic member. In some embodiments of the invention, the recess and the valve seat are both inverted T-shaped in cross-section, with the inverted T-shaped valve seat received in the inverted T-shaped recess. When the supporting seat rotates, the groove drives the valve seat therein to move. The lower part of the inverted T-shaped valve seat is larger than the diameter of the flow channel, so that the valve seat can completely cover the flow channel to realize sealing when moving to the upper part of the flow channel; the upper portion of the inverted T-shaped valve seat is provided with a containing groove for containing the elastic piece, and the diameter of the containing groove is slightly larger than that of the elastic piece so as to limit and guide the compression of the elastic piece.

According to some preferred embodiments of the present invention, a communication hole is formed above the support seat corresponding to the groove, the communication hole penetrates through the thickness direction of the support seat, and the communication hole is used for communicating the groove and the cavity.

When the pressure in the flow channel is increased by a certain value, the acting force of the valve seat above the flow channel is larger than the elastic force of the elastic piece, the fluid medium breaks through the gap between the valve seat and the groove and the communication hole and enters the cavity of the valve cover and the valve body, the pressure in the cavity acts on the downstream valve seat above the other channel, and the formed medium acting force and the elastic piece act on the upper part of the downstream valve seat together, so that the sealing effect after the valve is exerted. The surface of the valve seat is provided with a certain gap from the surface of the groove, namely the size of the valve seat is smaller than the size of the corresponding position of the groove, so that when the fluid medium breaks through the front seal of the valve, the fluid medium can enter the cavity after entering the communication hole from the flow passage.

According to some preferred embodiments of the invention, the flow channel comprises a first flow channel and a second flow channel in a same vertical plane, the channels comprise a first channel and a second channel in a same vertical plane, the valve seat comprises a first valve seat and a second valve seat in a same vertical plane, and the vertical planes of the first channel and the second channel are perpendicular to the vertical planes of the first valve seat and the second valve seat.

Namely, an inlet and outlet channel and a groove for placing two valve seats are symmetrically arranged on one supporting seat. When the valve is in an open state, the two channels on the supporting seat are respectively communicated with the two flow channels on the valve body, if a fluid medium flows in from the first flow channel on the left side of the valve body, the fluid medium enters the cavity formed by the valve cover and the valve body from the first channel which is communicated with the valve cover and then flows out from the second channel on the right side and the second flow channel, and at the moment, the first valve seat and the second valve seat are in contact with the boss surface of the valve body (namely, the first valve seat and the second valve seat are staggered with the flow channels and are not positioned above the flow channels). The valve is rotated, the supporting seat is driven to rotate through the valve rod, the supporting seat drives the first valve seat and the second valve seat to rotate by 90 degrees, the valve is changed from an open state to a closed state, at the moment, sealing surfaces (lower surfaces) of the first valve seat and the second valve seat are just located right above two flow passages of the valve body, and the first valve seat and the second valve seat are pushed down through acting force of the elastic piece, so that the valve seat and the valve body are tightly contacted under the action of elastic force of the elastic piece to form front sealing of the low-pressure valve. The valve body, the runner on the valve body, the supporting seat, the valve seat on the supporting seat and the groove are symmetrically designed, so that the valve has no orientation requirement in use.

According to some preferred embodiments of the present invention, the valve body is further provided with a fixed shaft, the axis of the fixed shaft coincides with the axis of the valve rod, and the support seat is sleeved on the fixed shaft. In some embodiments, the fixed shaft is sleeved with a bearing, the lower part of the supporting seat rotates with the fixed shaft through the bearing, and the upper part of the supporting part is fixedly connected with the valve rod.

According to some preferred embodiments of the present invention, the upper portion of the supporting portion is provided with a fixing groove, and the lower end of the valve rod is provided with a fixing block, and the fixing block is inserted into the fixing groove. The fixed block is a cube or a polygonal column, and the fixed groove is in a shape matched with the fixed block. In some embodiments, the valve rod is connected to the support seat through a square head, and when the valve rod rotates, the support seat is driven to rotate.

According to some preferred embodiments of the invention, the valve cover comprises a flange arranged on the valve cover, a sealing ring and a sealing ring are arranged on the contact surface of the flange and the valve cover, and the diameter of the sealing ring is larger than that of the sealing ring. The sealing ring on the contact surface of the flange and the valve cover is preferably a BX sealing ring.

According to some preferred embodiments of the invention, a first valve stem packing and a second valve stem packing are respectively arranged between the valve cover and the flange and the valve cover, and the assembly directions of the first valve stem packing and the second valve stem packing are opposite.

Specifically, in some embodiments, to achieve the tightness of the valve, the following settings are made: in order to prevent external seawater from entering the valve through a connecting gap of the valve, a first valve rod filler is arranged between the valve rod and the flange and is reversely assembled, so that the effect of sealing the external pressure of the seawater is achieved, and meanwhile, an O-shaped ring auxiliary seal is also arranged between the valve rod and the flange; a second valve rod filler is arranged between the valve rod and the valve cover, so that the secondary sealing effect is achieved; a double seal of a metal sealing gasket ring and an O-shaped ring is arranged between the valve body and the valve cover; the sealing of the BX sealing ring and the O-shaped ring is arranged between the flange and the valve cover, the arrangement of the BX sealing ring can prevent the poor fluid medium in the second valve rod packing sealing cavity, the third sealing effect is achieved, and meanwhile the secondary sealing effect of the O-shaped ring between the flange and the valve cover for sealing the external sea water is also prevented. And a leak detection channel is arranged after each seal and is used for effectively detecting the reliability of each position seal.

According to some preferred embodiments of the present invention, the flange comprises a connecting component, wherein the connecting component is arranged on the flange, the connecting component comprises an interface and a connecting sleeve, the connecting sleeve is used for driving the valve rod to rotate, a limiting pointer is fixed on the connecting sleeve and used for indicating the rotation angle of the valve rod and the supporting seat, a limiting opening is formed in the interface, and the limiting pointer penetrates through the limiting opening and is used for limiting the rotation position of the limiting pointer so as to limit the rotation angle of the valve rod and the supporting seat. In some embodiments of the present invention, the interface and the connection sleeve are an ROV interface and an ROV connection sleeve which are matched with an ROV (unmanned aerial vehicle, remote Operated Vehicle), and the ROV is connected with the ROV connection sleeve and the ROV interface through the ROV, and the ROV connection sleeve rotates under the driving of the ROV to drive the valve rod to rotate.

The rotation angle of the valve rod and the supporting seat can be limited by forming a limiting opening, and in some embodiments of the invention, the rotation angle is preferably 90 degrees. Specifically, a limit opening of 90 degrees (pi/2 radian) is formed in the ROV interface, a limit pointer penetrating through the limit opening is fixed on the ROV connecting sleeve, the limit pointer rotates along with the valve rod and the ROV connecting sleeve in the rotating operation process of the valve, and the opening and closing positions of the valve are limited through the cooperation of the limit opening and the limit pointer.

According to some preferred embodiments of the invention, the valve rod is connected to the ROV connecting sleeve after penetrating through the valve cover, the flange and the bottom of the ROV interface, and a penetrating hole matched with the valve cover is formed in the valve cover. In order to further strengthen the seal, the lower part of the valve rod is provided with a strengthening part with a diameter larger than that of the through hole, and the strengthening part is positioned above the supporting seat. A transition part is further arranged above the reinforcing part, the transition part comprises an arc-shaped part and a sealing inclined surface, the arc-shaped part is formed by the concave of the valve rod, namely, the diameter of the arc-shaped part is smaller than that of the valve rod; the upper end of the sealing inclined plane is connected with the arc-shaped part, and the lower end of the sealing inclined plane is connected with the reinforcing part. The lower end of the through hole, namely the end close to the cavity, is provided with a matching inclined plane matched with the sealing inclined plane, the inclination angles of the two inclined planes are the same, preferably 30-60 degrees, and the two inclined planes are matched with each other to strengthen the sealing effect. When the valve cavity is pressurized, the valve rod can be in extrusion contact with the valve cover under the action of the cavity pressure to form the inverted seal of the valve.

According to some preferred embodiments of the invention, a first guide strip and a second guide strip are respectively arranged between the valve rod and the interface and the valve cover, so as to prevent the valve rod from being directly contacted with metal when rotating, and the scratch is caused.

Compared with the prior art, the rotary gate valve has reasonable structural design and compact component structure, and the lower end of the valve rod is fixedly provided with the valve seat assembly and the valve seat assembly is provided with the channel penetrating through the thickness direction of the valve seat assembly, so that the valve seat assembly can be driven to rotate through the rotation of the valve rod, the channel on the valve seat assembly and the flow channel on the valve body are mutually communicated or staggered, the opening and closing of the valve are realized, the traditional lifting operation mode is converted into the rotary operation mode, and the gate valve can be operated to switch at a fixed angle such as 90 degrees, thereby achieving the purpose of rapidly switching the valve; the sealing device has the advantages of high transmission efficiency, quick switching, good sealing effect and the like, and is suitable for certain conditions with special requirements.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic cross-sectional view of a rotary gate valve in a closed state according to a preferred embodiment of the present invention;

FIG. 2 is an enlarged view of section I of FIG. 1;

FIG. 3 is a schematic cross-sectional view of a valve seat assembly in a rotary gate valve according to a preferred embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a rotary gate valve in an open state according to a preferred embodiment of the present invention;

FIG. 5 is a perspective view of a rotary gate valve in accordance with a preferred embodiment of the present invention;

in the accompanying drawings: 1-valve body, 2-bearing, 3-first valve seat, 4-elastic member, 5-screw, 6-first guide band, 7-screw, 8-check finger, 9-open indication, 10-ROV interface, 11-valve stem, 12-ROV adapter sleeve, 13-closed indication, 14-screw, 15-indicator plate, 16-screw, 17-first stem packing, 18-O-ring, 19-retainer ring, 20-BX seal ring, 21-O-ring, 22-flange, 23-valve cover, 24-second stem packing, 25-second guide band, 26-retainer, 27-support seat, 28-second valve seat, 29-metal gasket, 30-O-ring, 31-first flow channel, 32-second flow channel, 33-first flow channel, 34-second flow channel, 35-communication hole, 36-cavity, 37-fixed shaft, 38-reinforcement, 39-arcuate portion, 40-sealing ramp, 41-mating ramp, 42-check port, 43-transition portion, 44-fixed groove, 45-46, groove, 47-seal receiving groove, 48-receiving groove.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

Referring to fig. 1-5, the rotary gate valve of the present embodiment can be applied to an underwater environment, and includes a valve body 1, a valve cover 23, a valve rod 11 penetrating through the valve cover 23, a valve seat assembly disposed at a lower end portion of the valve rod 11, a flange 22 disposed on the valve cover 23, and a connection assembly disposed on the flange 22 for performing a valve opening and closing operation, wherein the valve rod 11 is used for driving the valve seat assembly to rotate, a cavity 36 is disposed between the valve body 1 and the valve cover 23, the valve seat assembly is accommodated in the cavity 36, a flow passage for fluid circulation is formed on the valve body 1, a passage is formed on the valve seat assembly, and the passage penetrates through a thickness direction of the valve seat assembly.

The connecting assembly comprises an interface and a connecting sleeve, the connecting sleeve is used for driving the valve rod 11 to rotate, a limiting pointer 8 is fixed on the connecting sleeve, a limiting opening 42 is formed in the interface, and the limiting pointer 8 penetrates through the limiting opening 42. In this embodiment, the interface and the connecting sleeve are respectively an ROV interface 10 and an ROV connecting sleeve 12 which are matched with an ROV (remotely controlled unmanned submersible vehicle, remote Operated Vehicle), and are connected with the ROV connecting sleeve 12 and the ROV interface 10 through the ROV, and the ROV connecting sleeve 12 rotates under the driving of the ROV to drive the valve rod 11 to rotate. The rotation angle of the valve rod 11 and the valve seat assembly can be limited by opening the limiting opening 42, and the rotation angle is limited to 90 degrees in the embodiment. Specifically, a limit port 42 of 90 ° (pi/2 radian) is formed on the ROV interface 10, a limit pointer 8 penetrating through the limit port 42 is fixed on the ROV connecting sleeve 12, the limit pointer 8 rotates along with the valve rod 11 and the ROV connecting sleeve 12 in the rotating operation process of the valve, and the opening and closing positions of the valve are limited through the cooperation of the limit port 42 and the limit pointer 8.

The valve seat assembly comprises a supporting seat 27, a channel and a groove 46 which are formed in the supporting seat 27, a valve seat arranged in the groove 46 and an elastic piece 4 arranged between the valve seat and the supporting seat 27, wherein the groove 46 is formed close to the valve body 1, the channel penetrates through the thickness direction of the supporting seat 27, and the elastic piece 4 is used for providing a trend that the valve seat is attached to the valve body 1. The elastic element 4 is used for providing sealing pre-tightening force, so that the lower surface of the valve seat is always attached to the upper surface of the part of the valve body 1 forming the cavity 36, and the acting force of the elastic element 4 can play a role in low-pressure sealing in the valve closing state. The elastic member 4 in this embodiment is preferably a columnar spring.

The valve seat comprises a lower sealing part 47 and an upper containing part 48, the diameter of the sealing part 47 is larger than that of the flow passage, and the containing part 48 is provided with a containing groove 49 for containing the elastic element 4. In this embodiment, the recess 46 and the valve seat are both of an inverted T-like cross-section, with the inverted T-shaped valve seat being received within the inverted T-shaped recess 46. When the support seat 27 rotates, the valve seat therein is moved by the groove 46. The lower part of the inverted T-shaped valve seat is larger than the diameter of the flow channel, so that the valve seat can completely cover the flow channel to realize sealing when moving to the upper part of the flow channel; the upside-down T-shaped valve seat is provided with a receiving groove 49 for receiving the elastic member 4, and the diameter of the receiving groove 49 is slightly larger than that of the elastic member 4 so as to limit and guide the compression of the elastic member 4.

The support base 27 is provided with a communication hole 35 corresponding to the upper portion of the groove 46, the communication hole 35 penetrates through the thickness direction of the support base 27, and the communication hole 35 is used for communicating the groove 46 and the cavity 36. When the valve is completely closed, the valve seat is positioned above the flow channel (the axial line of the valve seat is coincident with the axial line of the flow channel), and when the pressure in the flow channel is increased by a certain value, the acting force of the valve seat above the flow channel is larger than the elastic force of the elastic piece 4, the fluid medium breaks through the gap between the valve seat and the groove 46 and the communication hole 35 to enter the valve cover 23 and the cavity 36 of the valve body 1, then the pressure in the cavity 36 acts on the downstream valve seat above the other channel, and the formed medium acting force and the elastic piece 4 act on the upper part of the downstream valve seat together, so that the valve back sealing effect is exerted. The surface of the valve seat is spaced from the surface of the recess 46 by a certain gap, i.e., the size of the valve seat is smaller than the corresponding position of the recess 46, so that when the fluid medium breaks the seal before the valve, the fluid medium can enter the cavity 36 from the flow passage into the communication hole 35.

In this embodiment, the gate valve is opened and closed by 90 ° during rotation, so the flow channel includes a first flow channel 31 and a second flow channel 32 located in the same vertical plane, the channel includes a first channel 33 and a second channel 34 located in the same vertical plane, the valve seat includes a first valve seat 3 and a second valve seat 28 located in the same vertical plane, the vertical planes of the first channel 33 and the second channel 34 are mutually perpendicular to the vertical planes of the first valve seat 3 and the second valve seat 28, the vertical planes of the first flow channel 31 and the second flow channel 32 are not moved, and the vertical planes of the first channel 33 and the second channel 34 and the vertical planes of the first valve seat 3 and the second valve seat 28 are driven to integrally rotate by the support seat 27, so that the positional relationship of the three vertical planes is changed, and further 90 ° of opening and closing of the valve is realized.

Specifically, one support seat 27 is symmetrically provided with an inlet and outlet channel and a groove 46 for placing two valve seats. As shown in fig. 4, when the valve is in an open state, the two channels on the supporting seat 27 are respectively communicated with the two channels on the valve body 1, if the fluid medium flows in from the first channel 31 on the left side of the valve body 1, the fluid medium enters the cavity 36 formed by the valve cover 23 and the valve body 1 from the first channel 33 which is communicated with the fluid medium, and then flows out from the second channel 34 and the second channel 32 on the right side, at this time, the first valve seat 3 and the second valve seat 28 are in contact with the boss surface of the valve body 1 (i.e. the first valve seat 3 and the second valve seat 28 are staggered with the channels and are not located above the channels). The valve is rotated, the supporting seat 27 is driven to rotate through the valve rod 11, the supporting seat 27 drives the first valve seat 3 and the second valve seat 28 to rotate by 90 degrees, the valve is changed from an open state to a closed state, at the moment, sealing surfaces (lower surfaces) of the first valve seat 3 and the second valve seat 28 are just above two flow passages of the valve body 1, and the first valve seat 3 and the second valve seat 28 are pushed downwards through acting force of the elastic piece 4, so that the valve seats and the valve body 1 are tightly contacted under the action of elastic force of the elastic piece 4 to form front sealing of the low-pressure valve, as shown in figures 1-3.

In order to further improve the stability of the operation of the valve, in this embodiment, the valve body 1 is further provided with a fixing shaft 37, the axis of the fixing shaft 37 coincides with the axis of the valve rod 11, the bearing 2 is sleeved outside the fixing shaft 37, the lower part of the supporting seat 27 rotates with the fixing shaft 37 through the bearing 2, and the upper part of the supporting part is fixedly connected with the valve rod 11. Meanwhile, a fixing groove 44 is formed in the upper portion of the supporting portion, a fixing block 45 is arranged at the lower end of the valve rod 11, and the fixing block 45 is inserted into the fixing groove 44. In this embodiment, the valve rod 11 is connected to the support seat 27 through a square head, and when the valve rod 11 rotates, the support seat 27 is driven to rotate.

The contact surface of the flange 22 and the valve cover 23 is provided with a sealing ring and a sealing ring, and the diameter of the sealing ring is larger than that of the sealing ring. The sealing ring on the contact surface of the flange 22 and the valve cover 23 is preferably a BX sealing ring 20. A first valve stem packing 17 and a second valve stem packing 24 are respectively arranged between the valve cover 23 and the flange 22 and between the valve cover 23, and the assembly directions of the first valve stem packing 17 and the second valve stem packing 24 are opposite. The first guide belt 6 and the second guide belt 25 are respectively arranged between the valve rod 11 and the interface and the valve cover 23, so that the valve rod 11 is prevented from being scratched due to direct metal contact with surrounding components during rotation.

As shown in fig. 1 and 4, in order to achieve the sealability of the valve in the present embodiment, the following arrangement is made: in order to prevent external seawater from entering the valve through a connecting gap of the valve, a first valve rod filler 17 is arranged between the valve rod 11 and the flange 22 and is reversely assembled, so that the effect of sealing the external pressure of the seawater is achieved, and meanwhile, an O-shaped ring 18 and a check ring 19 are also arranged between the valve rod 11 and the flange 22 for auxiliary sealing; a second valve rod filler 24 is arranged between the valve rod 11 and the valve cover 23 to play a secondary sealing role; a double seal of a metal gasket ring 29 (at a horizontal contact surface) and an O-shaped ring 30 (at a vertical contact surface) is arranged between the valve body 1 and the valve cover 23; the BX sealing ring 20 and the O-shaped ring 21 are arranged between the flange 22 and the valve cover 23, and the BX sealing ring 20 can prevent poor fluid medium in the sealing cavity 36 of the second valve rod packing 24, plays a third sealing role, and simultaneously prevents poor secondary sealing effect of the O-shaped ring 21 between the flange 22 and the valve cover 23 on external seawater; a backing ring 26 is also provided at the top periphery of the support seat 27 where it contacts the valve cover 23. And a leak detection channel is arranged after each seal and is used for effectively detecting the reliability of each position seal.

The valve rod 11 penetrates through the valve cover 23, the flange 22 and the bottom of the ROV interface 10 and then is connected to the ROV connecting sleeve 12, and a through hole matched with the valve cover 23 is formed in the valve cover 23. The ROV nipple 12 is provided with a screw 16 which is arranged radially against the top of the valve stem 11, thereby fixedly connecting the valve stem 11 to the ROV nipple 12. To further strengthen the seal, the lower part of the valve stem 11 has a reinforcing portion 38 having a diameter larger than the diameter of the through-hole, the reinforcing portion 38 being located above the support seat 27. A transition part 43 is further arranged above the reinforcing part 38, the transition part 43 comprises an arc-shaped part 39 and a sealing inclined surface 40, the arc-shaped part 39 is formed by the concave of the valve rod 11, namely, the diameter of the arc-shaped part 39 is smaller than the diameter of the valve rod 11; the upper end of the seal inclined surface 40 is connected to the arc-shaped portion 39, and the lower end of the seal inclined surface 40 is connected to the reinforcing portion 38. The lower end of the through hole, i.e. the end close to the cavity 36, is provided with a matching inclined plane 41 matched with the sealing inclined plane 40, the inclination angles of the two inclined planes are the same and are 45 degrees, and the two inclined planes are matched with each other to strengthen the sealing effect. When the valve cavity 36 is pressurized, the valve rod 11 is in pressing contact with the valve cover 23 under the action of cavity pressure to form a valve reverse seal (the sealing inclined surface 40 is attached to the matching inclined surface 41).

In this embodiment, the flange 22 and the valve cover 23 are fixed by the screw 5, and the bottom of the ROV interface 10 and the flange 22 are fixed by the screw 7. An indicator plate 15 is also mounted on the upper part of the ROV interface 10 by means of screws 14 to indicate the on-off state of the valve. The indication board 15 is provided with an on indication 9 and an off indication 13. As described above, the rotary gate valve in the present embodiment has the open state in which the flow passage, the channel, and the chamber 36 are communicated with each other, and the closed state. The open and closed states of the valve are realized by rotating the valve rod 11 to drive the supporting seat 27 to rotate. When the passage on the support seat 27 rotates to above the flow passage of the valve body 1 (the axis of the passage coincides with the axis of the flow passage), the flow passage, the passage and the cavity 36 are mutually communicated, and fluid can flow, and at this time, the valve is in an open state. When the channel on the supporting seat 27 rotates to be staggered with the flow channel of the valve body 1 and the valve seat on the supporting seat 27 rotates to be above the flow channel of the valve body 1, namely the axial lead of the valve seat coincides with the axial lead of the flow channel, the valve is completely closed, fluid cannot flow, and the valve is in a closed state. The valve seat and the valve body 1 are in a metal-metal contact hard sealing mode, so that the sealing surface needs hardening treatment, and the metal-metal hard sealing can effectively ensure the long service life of the underwater gate valve. In this embodiment, the valve body 1 and the flow passage thereon, the support seat 27 and the valve seat and the groove 46 thereon are symmetrically designed, so that the valve is not required to be oriented.

The rotary gate valve is reasonable in structural design and compact in component structure, and through fixedly arranging the valve seat assembly at the lower end of the valve rod and arranging the channel penetrating through the valve seat assembly in the thickness direction of the valve seat assembly, the valve seat assembly can be driven to rotate through the rotation of the valve rod, so that the channel on the valve seat assembly and the flow channel on the valve body are mutually communicated or staggered, the opening and closing of the valve are realized, the traditional lifting operation mode is converted into the rotary operation mode, the gate valve can be operated to switch the valve at a fixed angle such as 90 degrees, and the aim of rapidly switching the valve is fulfilled; the sealing device has the advantages of high transmission efficiency, quick switching, good sealing effect and the like, and is suitable for certain conditions with special requirements.

The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.

Claims

1. The rotary gate valve is characterized by comprising a valve body, a valve cover, a valve rod penetrating through the valve cover and a valve seat assembly arranged at the lower end part of the valve rod, wherein the valve rod is used for driving the valve seat assembly to rotate, a cavity is arranged between the valve body and the valve cover, and the valve seat assembly is accommodated in the cavity;

the valve seat assembly comprises a supporting seat, a channel and a groove which are formed in the supporting seat, and a valve seat which is arranged in the groove, wherein the valve seat comprises a first valve seat and a second valve seat, and two grooves which are respectively used for placing the two valve seats are formed in the supporting seat; a gap is formed between the surface of the valve seat and the surface of the groove.

2. The rotary gate valve of claim 1, wherein the valve body is provided with a flow passage for fluid communication, and the valve seat assembly is provided with a passage; the groove is close to the valve body, the channel penetrates through the thickness direction of the supporting seat, an elastic piece is arranged between the valve seat and the supporting seat, and the elastic piece is used for providing a trend of fitting of the valve seat and the valve body.

3. The rotary gate valve according to claim 1, wherein the rotary gate valve has an open state and a closed state, and the valve rod rotates to drive the supporting seat to rotate so as to drive the valve seat in the groove to move, thereby realizing the switching of the rotary gate valve in different states; in the open state, the channel on the supporting seat rotates to the upper part of the valve body flow channel, and the flow channel, the channel and the cavity are communicated; under the closed state, the channel on the supporting seat rotates to be staggered with the valve body flow passage, the valve seat on the supporting seat rotates to be above the valve body flow passage, and the rotary gate valve is completely closed.

4. The rotary gate valve according to claim 2, wherein the valve seat comprises a lower sealing part and an upper containing part, the diameter of the sealing part is larger than that of the flow passage, and the containing part is provided with a containing groove for containing the elastic element; the cross sections of the groove and the valve seat are both inverted T-shaped, and the inverted T-shaped valve seat is accommodated in the inverted T-shaped groove.

5. The rotary gate valve according to claim 1, wherein the support seat is provided with a communication hole corresponding to an upper portion of the recess, the communication hole penetrating a thickness direction of the support seat, the communication hole being for communicating the recess and the cavity.

6. The rotary gate valve of claim 2, wherein the flow channel comprises a first flow channel and a second flow channel which are positioned in the same vertical plane, the channel comprises a first channel and a second channel which are positioned in the same vertical plane, the valve seat comprises a first valve seat and a second valve seat which are positioned in the same vertical plane, the valve rod rotates to drive the supporting seat to rotate, the position relation of the three vertical planes is changed, and then the rotary gate valve is opened and closed.

7. The rotary gate valve of claim 6, wherein the vertical plane in which the first and second passages lie is perpendicular to the vertical plane in which the first and second valve seats lie.

8. The rotary gate valve according to claim 1, wherein the valve body is further provided with a fixed shaft, the axis of the fixed shaft coincides with the axis of the valve rod, and the support seat is sleeved on the fixed shaft; the fixed shaft is sleeved with a bearing, the lower part of the supporting seat rotates with the fixed shaft through the bearing, and the upper part of the supporting part is fixedly connected with the valve rod.

9. The rotary gate valve of claim 1, comprising a flange disposed on the valve cover, a connection assembly disposed on the flange, the connection assembly comprising an interface and a connection sleeve; a first valve rod filler and a second valve rod filler are respectively arranged between the valve cover and the flange and between the valve cover, and the assembly directions of the first valve rod filler and the second valve rod filler are opposite; a first guide belt and a second guide belt are respectively arranged between the valve rod and the interface as well as between the valve rod and the valve cover.

10. The rotary gate valve of claim 1, wherein a sealing ramp for mating sealing with the valve cover is provided on a lower portion of the valve stem.