CN113175539B

CN113175539B - Rotary gate valve

Info

Publication number: CN113175539B
Application number: CN202110473618.XA
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: 2023-02-17
Anticipated expiration: 2041-04-29
Also published as: CN116221440A; CN116221439A; CN113175539A

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, the valve seat assembly is accommodated in the cavity, a flow passage for flowing fluid is formed in the valve body, a passage is formed in the valve seat assembly and penetrates through the thickness direction of the valve seat assembly, the rotary gate valve is in an opening state and a closing state, and the flow passage, the passage and the cavity are communicated with each other in the opening state. 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 the rotation of the valve rod, the channel in the valve seat assembly is communicated or staggered with the flow channel in the valve body, and the valve is opened and closed.

Description

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 open and close the valve.

Background

Most of existing gate valves are lifting rods or rotary lifting rod type structures, and generally, the existing gate valves are all converted into lifting motions of gate plates and valve rods through rotary motions. Structurally, the traditional gate valve has the defects of long stroke and high overall height of the valve; in operation, the traditional gate valve has the defects of more rotation operation circles and lower transmission efficiency, and the requirement of quick opening and closing cannot be met in actual use. On the other hand, in some special conditions, such as chemical injection or instrument valves, and in some underwater environments, the valve needs to meet the requirement of quick opening, and the traditional gate valve cannot meet the requirement.

Disclosure of Invention

Accordingly, the present invention has been made to overcome the above-mentioned drawbacks of the prior art, and it is an object of the present invention to provide a rotary gate valve which can convert a conventional lifting operation mode into a rotating operation mode, and achieve the purpose of rapidly opening and closing the valve.

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

the utility model provides a rotation type gate valve, includes valve body, valve gap, runs through the valve rod and the setting that the valve gap set up are in the disk seat subassembly of tip under the valve rod, the valve rod is used for driving the disk seat subassembly rotates, the cavity has between valve body and the valve gap, the disk seat subassembly holds in the cavity, offer 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, the rotation type gate valve has open mode and closed state, under the open mode, runner, passageway and cavity link up each other.

According to some preferred implementation aspects of the invention, the valve seat assembly comprises a supporting seat, a channel arranged on the supporting seat, a groove and a valve seat arranged in the groove, the groove is arranged close to the valve body, the channel penetrates through the thickness direction of the supporting seat, and an elastic piece is arranged between the valve seat and the supporting seat and used for providing a tendency of the valve seat and the valve body to be attached. 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 in the valve body, and the acting force of the elastic piece can play a role in low-pressure sealing when the valve is closed. In some embodiments, the resilient member is preferably a cylindrical spring or a disc spring.

The open state and the close state of the valve are realized by driving the supporting seat to rotate through the rotation of the valve rod. When the channel on the supporting seat rotates to the position above the valve body channel, the channel and the cavity are communicated, fluid can flow, and the valve is in an open state at the moment. 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 superposed with the axial lead of the flow channel, the valve is completely closed, fluid cannot flow, and the valve is in a closed state at the moment.

The valve seat and the valve body are in metal-metal contact hard sealing form, so that the sealing surface needs to be hardened, and the metal-metal hard sealing can effectively ensure the long-term service life of the underwater gate valve.

According to some preferred implementation aspects of the invention, the valve seat comprises a lower sealing part and an upper accommodating part, the diameter of the sealing part is larger than that of the flow passage, and an accommodating groove for accommodating the elastic piece is formed in the accommodating part. In some embodiments of the invention, the cross-section of the groove and the valve seat are each inverted T-shaped, and the valve seat of the inverted T-shape is received in the groove of the inverted T-shape. When the supporting seat rotates, the valve seat in the supporting seat is driven to move through the groove. The lower part of the inverted T-shaped valve seat is larger than the diameter of the flow passage, so that the valve seat can completely cover the flow passage to realize sealing when moving to the position above the flow passage; the upper portion of the inverted T-shaped valve seat is provided with an accommodating groove used for accommodating the elastic piece, and the diameter of the accommodating 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 invention, the support seat is provided with a communication hole above the groove, the communication hole penetrates through the support seat in the thickness direction, and the communication hole is used for communicating the groove and the cavity.

When the pressure in the flow channel is increased to a certain value, the acting force acting on the valve seat above the flow channel is larger than the elastic force of the elastic part, the fluid medium breaks through the front seal of the valve and enters the cavity of the valve cover and the valve body through the gap between the valve seat and the groove and the communication hole, then the pressure in the cavity acts on the downstream valve seat above the other channel, the formed medium acting force and the elastic part act on the downstream valve seat together, and therefore the sealing effect behind the valve is exerted. The surface of the valve seat has a certain gap from the surface of the groove, namely the size of the valve seat is smaller than that 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 communicating hole from the flow channel.

According to some preferred implementation aspects of the invention, the flow passages comprise a first flow passage and a second flow passage which are located in the same vertical plane, the passages comprise a first passage and a second passage which are located in the same vertical plane, the valve seats comprise a first valve seat and a second valve seat which are located in the same vertical plane, and the vertical plane in which the first passage and the second passage are located is perpendicular to the vertical plane in which the first valve seat and the second valve seat are located.

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 fluid media flow in from the first flow channel on the left side of the valve body, the fluid media can enter a cavity formed by the valve cover and the valve body from the first channel which is communicated with the first channel, then flow out from the second channel and the second flow channel on the right side, and at the moment, the first valve seat and the second valve seat are in surface contact with a boss 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). Rotate the valve, drive the supporting seat through the valve rod and rotate, the supporting seat drives first disk seat and second disk seat and carries out 90 rotations, the valve will have the open mode to become the closed condition, sealed face (lower surface) of first disk seat and second disk seat just is located two runners of valve body directly over this moment, and the effort through the elastic component pushes up first disk seat, second valve seat downwards for disk seat and valve body be in close contact with under the effect of elastic component elasticity and form before the low-pressure valve sealed. The valve body and the flow passage on the valve body, the supporting seat and the valve seat and the groove on the supporting seat are designed symmetrically, so that the valve has no orientation requirement in use.

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

According to some preferred implementation aspects of the invention, the valve 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 implementation aspects 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 assembling directions of the first valve stem packing and the second valve stem packing are opposite.

Specifically, in some embodiments, to achieve the sealing performance 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 packing is arranged between the valve rod and the flange and is reversely assembled, so that the external pressure of the seawater is sealed, and meanwhile, an O-shaped ring is arranged between the valve rod and the flange for auxiliary sealing; a second valve rod filler is arranged between the valve rod and the valve cover, and plays a role in secondary sealing; a metal sealing gasket ring and an O-shaped ring are arranged between the valve body and the valve cover for double sealing; be provided with the sealed of BX sealing washer and O type circle between flange and the valve gap, the setting of BX sealing washer can prevent that the second valve stem packs the fluid medium in the sealed cavity bad, plays the effect of third way sealed, also prevents the bad secondary seal effect of the outside sea water of O type ring seal between flange and the valve gap simultaneously. And a leakage detection channel is arranged behind each seal for effectively detecting the reliability of each position seal.

According to some preferred implementation aspects of the invention, the flange-type connecting assembly comprises a connecting assembly arranged on the flange, the connecting assembly comprises a connector 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 rotating angle of the valve rod and the supporting seat, a limiting opening is formed in the connector, and the limiting pointer penetrates through the limiting opening and is used for limiting the rotating position of the limiting pointer so as to limit the rotating angle of the valve rod and the supporting seat. In some embodiments of the present invention, the port and the connecting sleeve are an ROV port and an ROV connecting sleeve respectively, which are matched with an ROV (Remote Operated Vehicle), and the ROV port and the ROV connecting sleeve are connected through an ROV, and the ROV connecting sleeve rotates under the driving of the ROV to drive the valve rod to rotate.

The rotation angle of the valve rod and the support seat can be limited by arranging the limiting opening, and the limiting opening is preferably 90 degrees in some embodiments of the invention. Specifically, a 90-degree (pi/2 radian) limiting port is formed in the ROV interface, a limiting pointer penetrating through the limiting port is fixed on the ROV connecting sleeve, the limiting 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 position of the valve is limited through the matching of the limiting port and the limiting pointer.

According to some preferred implementation aspects of the invention, the valve rod penetrates through the valve cover, the flange and the bottom of the ROV connector and then is connected to the ROV connecting sleeve, and the valve cover is provided with a through hole matched with the valve cover. In order to further strengthen the sealing, 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 also arranged above the reinforcing part and comprises an arc-shaped part and a sealing inclined plane, the arc-shaped part is formed by inward 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 one end close to the cavity body, is provided with a matching inclined plane matched with the sealing inclined plane, the inclined angles of the two inclined planes are the same, preferably 30-60 degrees, and the two inclined planes are matched with each other to enhance the sealing effect. When the valve cavity has pressure, the valve rod can be in extrusion contact with the valve cover under the action of the pressure of the inner cavity to form the reverse seal of the valve.

According to some preferred embodiments of the present invention, the first guide strip and the second guide strip are respectively disposed between the valve stem and the mouthpiece and the bonnet, and prevent direct metal contact between the valve stem and surrounding parts during rotation, which may cause scratches.

Compared with the prior art, the rotary gate valve has the advantages that the structural design is reasonable, the component structure is compact, the valve seat assembly is fixedly arranged at the lower end of the valve rod, the passage penetrating through the thickness direction of the valve seat assembly is formed in the valve seat assembly, the valve rod can rotate to drive the valve seat assembly to rotate, the passage in the valve seat assembly and the flow passage in the valve body are communicated or staggered mutually to realize the opening and closing of the valve, the traditional lifting operation mode is converted into the rotary operation mode, the valve switch can be operated at a fixed angle such as 90 degrees by the gate valve, and the purpose of quickly opening and closing the valve is achieved; the novel hydraulic power transmission device has the advantages of high transmission efficiency, high switching speed, 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 in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic cross-sectional view of a rotary gate valve in a closed condition in accordance with 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 in accordance with a preferred embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a rotary gate valve in an open condition in accordance with 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 drawings: 1-valve body, 2-bearing, 3-first valve seat, 4-elastic part, 5-screw, 6-first guide belt, 7-screw, 8-limit pointer, 9-open indication, 10-ROV interface, 11-valve stem, 12-ROV connecting sleeve, 13-close indication, 14-screw, 15-indication plate, 16-screw, 17-first valve stem packing, 18-O-shaped ring, 19-check ring, 20-BX sealing ring, 21-O-shaped ring, 22-flange, 23-valve cover, 24-second valve stem packing, 25-second guide belt, 26-cushion ring, 27-support seat, 28-second valve seat, 29-metal sealing cushion ring, 30-O-shaped ring, 31-first flow passage, 32-second flow passage, 33-first passage, 34-second passage, 35-communication hole, 36-cavity, 37-fixed shaft, 38-reinforcing part, 39-arc part, 40-sealing inclined surface, 41-matching inclined surface, 42-inclined surface, 43-transition surface, 44-second passage, 34-second passage, 35-communication hole, 36-cavity, 38-fixed shaft, 38-reinforcing part, 39-arc part, 40-sealing inclined surface, 41-fixing block, 41-matching inclined surface, 43-45-groove part, and 49-47-containing groove part.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 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 disposed 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 connecting assembly disposed on the flange 22 and used 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 disposed on the valve body 1, a passage is disposed on the valve seat assembly, and the passage passes 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 port 42 is formed in the interface, and the limiting pointer 8 penetrates through the limiting port 42. In this embodiment, the port and the connecting sleeve are an ROV port 10 and an ROV connecting sleeve 12 respectively matched with an ROV (Remote Operated Vehicle), and the ROV port 12 and the ROV port 10 are connected through an ROV, and the ROV connecting sleeve 12 rotates under the driving of the ROV to drive the valve stem 11 to rotate. The rotation angle of the valve rod 11 and the valve seat assembly can be limited by arranging the limiting port 42, and the rotation angle is limited to 90 degrees in the embodiment. Specifically, a 90-degree (pi/2 radian) limit port 42 is formed in 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 position of the valve is limited through the matching 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 part 4 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 part, forming the cavity 36, of the valve body 1, and the acting force of the elastic part 4 can play a role in low-pressure sealing when the valve is in a closed state. The elastic member 4 in this embodiment is preferably a cylindrical spring.

The valve seat comprises a lower sealing part 47 and an upper accommodating part 48, the diameter of the sealing part 47 is larger than that of the flow passage, and an accommodating groove 49 for accommodating the elastic element 4 is formed in the accommodating part 48. In this embodiment, the cross-section of the groove 46 and the valve seat are each shaped like an inverted T, with the valve seat of the inverted T received in the groove 46 of the inverted T. 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 passage, so that the valve seat can completely cover the flow passage to realize sealing when moving to the position above the flow passage; the upper portion of the inverted T-shaped valve seat is provided with a containing groove 49 for containing the elastic element 4, and the diameter of the containing groove 49 is slightly larger than that of the elastic element 4 so as to limit and guide the compression of the elastic element 4.

The supporting seat 27 is provided with a communication hole 35 above the groove 46, the communication hole 35 penetrates through the thickness direction of the supporting seat 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), when the pressure in the flow channel is increased by a certain value, and the acting force acting on the valve seat above the flow channel is larger than the elastic force of the elastic element 4, fluid media can break through the front seal of the valve, enter the valve cover 23 and the cavity 36 of the valve body 1 through the gap between the valve seat and the groove 46 and the communication hole 35, then the pressure in the cavity 36 can act on the downstream valve seat above the other channel, and the formed medium acting force and the elastic element 4 act on the downstream valve seat together, so that the rear seal effect of the valve is exerted. The surface of the valve seat has a certain clearance from the surface of the groove 46, namely the size of the valve seat is smaller than the size of the corresponding position of the groove 46, so that when the fluid medium breaks through the front seal of the valve, the fluid medium can enter the cavity 36 after entering the communication hole 35 from the flow channel.

In this embodiment, the gate valve is opened and closed at 90 ° during rotation, so the flow channel includes the first flow channel 31 and the second flow channel 32 located in the same vertical plane, the channel includes the first channel 33 and the second channel 34 located in the same vertical plane, the valve seat includes the first valve seat 3 and the second valve seat 28 located in the same vertical plane, the vertical plane where the first channel 33 and the second channel 34 are located is perpendicular to the vertical plane where the first valve seat 3 and the second valve seat 28 are located, the vertical plane where the first channel 31 and the second flow channel 32 are located is stationary, the vertical plane where the first channel 33 and the second channel 34 are located and the vertical plane where the first valve seat 3 and the second valve seat 28 are located are driven to integrally rotate by the support base 27, the positional relationship of the three vertical planes is changed, and further 90 ° opening and closing of the valve is achieved.

Specifically, an inlet/outlet passage and a groove 46 for placing two valve seats are symmetrically formed on one support seat 27. As shown in fig. 4, when the valve is in an open state, the two passages on the support seat 27 are respectively communicated with the two flow passages on the valve body 1, and if a fluid medium flows in from the first flow passage 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 through passage 33, and then flows out from the second through passage 34 and the second through passage 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 from the flow passages and are not located above the flow passages). 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 into a closed state from an open state, the sealing surfaces (lower surfaces) of the first valve seat 3 and the second valve seat 28 are just positioned right above the two flow channels of the valve body 1, the first valve seat 3 and the second valve seat 28 are pushed downwards through the acting force of the elastic part 4, and the valve seat and the valve body 1 are in close contact under the action of the elastic part 4 to form low-pressure valve front seal, 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 fixed shaft 37, the axis of the fixed shaft 37 coincides with the axis of the valve rod 11, the bearing 2 is sleeved outside the fixed shaft 37, the lower part of the supporting seat 27 rotates with the fixed shaft 37 through the bearing 2, and the upper part of the supporting part is fixedly connected with the valve rod 11. Meanwhile, the fixing groove 44 is formed in the upper portion of the supporting portion, the 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 supporting seat 27 through a square head, and when the valve rod 11 rotates, the supporting 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. The valve cover 23 and the flange 22 and the valve cover 23 are respectively provided with a first valve stem packing 17 and a second valve stem packing 24, and the assembling directions of the first valve stem packing 17 and the second valve stem packing 24 are opposite. The first guide strip 6 and the second guide strip 25 are respectively arranged between the valve rod 11 and the interface and the valve cover 23, and prevent direct metal contact between the valve rod 11 and surrounding parts during rotation, which causes scratches.

As shown in fig. 1 and 4, in order to achieve the sealing performance of the valve in the present embodiment, 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 packing 17 is arranged between the valve rod 11 and the flange 22 and is reversely assembled to play a role in sealing seawater external pressure, 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 packing 24 is arranged between the valve rod 11 and the valve cover 23, and plays a role in secondary sealing; a metal sealing gasket ring 29 (at a horizontal contact surface) and an O-shaped ring 30 (at a vertical contact surface) are arranged between the valve body 1 and the valve cover 23 for double sealing; the BX sealing ring 20 and the O-shaped ring 21 are arranged between the flange 22 and the valve cover 23 for sealing, and the BX sealing ring 20 can prevent the fluid medium in the second valve stem packing 24 sealing cavity 36 from being bad, so that a third sealing effect is achieved, and meanwhile, the secondary sealing effect of the O-shaped ring 21 between the flange 22 and the valve cover 23 for sealing the bad external seawater is also prevented; a backing ring 26 is also provided at the top outer edge of the support seat 27 where it contacts the valve cover 23. And a leakage detection channel is arranged behind each seal 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 connector 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 coupling sleeve 12 is provided with a screw 16 which is radially pressed against the top of the valve stem 11 to fixedly connect the valve stem 11 with the ROV coupling sleeve 12. In order to further enhance the sealing, the lower portion of the valve stem 11 has a reinforced portion 38 having a diameter larger than that of the through hole, and the reinforced portion 38 is 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 inward concave of the valve rod 11, namely the diameter of the arc-shaped part 39 is smaller than that of the valve rod 11; the upper end of the sealing slope 40 is connected to the arc portion 39, and the lower end of the sealing slope 40 is connected to the reinforcement portion 38. The lower end of the through hole, namely one end close to the cavity 36, is provided with a matching inclined surface 41 matched with the sealing inclined surface 40, the inclined angles of the two inclined surfaces are the same and are both 45 degrees, and the two inclined surfaces are mutually matched to strengthen the sealing effect. When the valve cavity 36 is pressurized, the valve rod 11 is pressed and contacted with the valve cover 23 under the action of the pressure of the inner cavity to form the reverse seal of the valve (the sealing inclined surface 40 is jointed with the matching inclined surface 41).

In this embodiment, the flange 22 and the valve cover 23 are fixed by screws 5, and the bottom of the ROV port 10 and the flange 22 are fixed by screws 7. The upper part of the ROV interface 10 is also provided with an indicator plate 15 by means of a screw 14 to indicate the open and close 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 this embodiment has an open state in which the flow passage, the passage and the chamber 36 communicate with each other and a closed state. The open state and the close state of the valve are realized by rotating the valve rod 11 to drive the supporting seat 27 to rotate. When the channel on the support seat 27 rotates to the position above the flow channel of the valve body 1 (the axis of the channel coincides with the axis of the flow channel), the flow channel, the channel and the cavity 36 are communicated with each other, the fluid can flow, and 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 is superposed with the axial lead of the flow channel, the valve is completely closed, fluid cannot flow, and the valve is in a closed state at the moment. The valve seat and the valve body 1 are in metal-metal contact hard sealing, so that the sealing surface needs to be hardened, and the metal-metal hard sealing can effectively ensure the long-term service life of the underwater gate valve. In this embodiment, the valve body 1 and the flow channel thereon, the supporting base 27 and the valve seat thereon, and the groove 46 are designed symmetrically, so that the valve has no orientation requirement.

The rotary gate valve has reasonable structural design and compact component structure, 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 by rotating the valve rod, the channel on the valve seat assembly and the flow channel on the valve body are mutually communicated or staggered to realize the opening and closing of the valve, the traditional lifting operation mode is converted into the rotary operation mode, and the gate valve can operate a valve switch at a fixed angle such as 90 degrees to achieve the aim of quickly opening and closing the valve; the novel hydraulic power transmission device has the advantages of high transmission efficiency, high switching speed, good sealing effect and the like, and is suitable for certain conditions with special requirements.

The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.

Claims

1. A 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 sealing inclined plane used for being matched and sealed with the valve cover is arranged on the lower part of the valve rod;

the valve seat assembly comprises a supporting seat, a channel and a groove which are arranged on the supporting seat, and a valve seat arranged in the groove, wherein the groove is arranged 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 attaching the valve seat and the valve body;

a communicating hole is formed in the supporting seat corresponding to the upper part of the groove, penetrates through the thickness direction of the supporting seat and is used for communicating the groove and the cavity;

the size of the valve seat is smaller than that of the corresponding position of the groove, so that when fluid media break through the front seal of the valve, the fluid media can enter the cavity after entering the communicating hole from the flow channel; the valve seats comprise a first valve seat and a second valve seat which are positioned in the same vertical plane, and the grooves comprise a first groove corresponding to the first valve seat and a second groove corresponding to the second valve seat.

2. The rotary gate valve according to claim 1, wherein the valve seat includes a lower sealing portion and an upper receiving portion, the sealing portion having a diameter larger than that of the flow passage, and the receiving portion having a receiving groove for receiving the elastic member.

3. The rotary gate valve of claim 1, wherein the flow passages comprise first and second flow passages that are located in a common vertical plane, and the passages comprise first and second passages that are located in a common vertical plane, the first and second passages being located in a vertical plane that is perpendicular to a vertical plane in which the first and second valve seats are located.

4. The rotary gate valve of claim 1, wherein the valve body further comprises a fixed shaft, the axis of the fixed shaft coincides with the axis of the valve stem, and the supporting seat is sleeved on the fixed shaft.

5. The rotary gate valve according to claim 1, wherein a fixing groove is formed at an upper portion of the support base, and a fixing block is formed at a lower end of the valve stem, and the fixing block is inserted into the fixing groove.

6. A rotary gate valve according to any one of claims 1 to 5, comprising a flange provided on the valve cap, the flange having a sealing ring and a sealing ring provided on the interface with the valve cap, the sealing ring having a diameter greater than the diameter of the sealing ring.

7. The rotary gate valve of claim 6, wherein a first stem packing and a second stem packing are disposed between the stem and the flange and bonnet, respectively, the first stem packing and the second stem packing being assembled in opposite directions.

8. The rotary gate valve of claim 6, comprising a connecting assembly disposed on the flange, wherein the connecting assembly comprises a connector 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, a limiting opening is formed on the connector, and the limiting pointer penetrates through the limiting opening.