Automatic totally-closed low-flow-resistance two-way valve

Abstract

The utility model discloses an automatic totally-closed low-flow-resistance two-way valve which is characterized by being composed of a valve body, an inlet connecting pipe, an outlet connecting pipe, a valve plate, a transition conversion seat, a valve plate driving mechanism, an upper end cover, a lower end cover and a connecting piece. A transition conversion seat is arranged at the position, corresponding to the outlet connecting pipe, in the valve body, a valve plate is arranged on the left side of the transition conversion seat, and a valve plate driving mechanism is arranged on at least one of the upper portion or the lower portion of the valve plate. An upper end cover and a lower end cover are respectively arranged above and below the valve body; at least one of the upper end cover and the lower end cover or the upper end and the lower end of the valve body is provided with a connecting piece; by additionally arranging the transition conversion seat, the transition conversion seat is perfectly matched with the plane of the valve plate, so that the sealing performance is greatly improved, the cost is reduced, the valve plate can deviate and automatically compensate after being abraded, leakage is completely eradicated, and low-flow-resistance fluid two-way control is effectively achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to automatic valve and low flow resistance two-way valve technical field, concretely is an automatic full-closed low flow resistance two-way valve for refrigeration and heating air conditioning heat recovery and other fields, and it is a two-way valve that can realize one-way or bidirectional opening, closing and opening degree flow control, and the control mode adopts self inlet and outlet pressure difference control or control through the full-closed electric drive unit in the valve body. BACKGROUND

[0002] At present, the existing automatic control two-way valve is mainly manual ball valve or manual stop valve or manual gate valve plus actuator mode, and the actuator is external, so it is not only complex in structure, but also prone to external leakage, if gas-liquid control is needed, it needs to be connected with external gas-liquid pressure source, and also needs to increase control pipeline, resulting in high use cost and maintenance cost.

[0003] In addition, the manual stop valve has large flow resistance, the manual ball valve is prone to wear between the valve rod and the floating ball, the manual gate valve is difficult to process the inner plane, and is wedge-shaped structure, and is prone to locking problem.

[0004] The existing automatic valve cannot realize multiple control of gas-liquid, electricity and manual.

[0005] In the field of automatic control electromagnetic two-way valve, whether the diaphragm or the piston structure, the flow resistance is large, and the two-way opening and closing function is not available.

[0006] The existing two-way electromagnetic valve with bidirectional opening and closing function has complex structure, and needs external connection of gas-liquid power for control in the driving mode, which brings difficulty to installation. CONTENT OF THE UTILITY MODEL

[0007] The utility model aims at overcoming the defects of the prior art, and provides an automatic full-closed low flow resistance two-way valve.

[0008] The utility model provides a technical scheme of an automatic full-closed low flow resistance two-way valve, which is characterized by comprising a valve body, an inlet pipe, an outlet pipe, a valve plate, a transition conversion seat, a valve plate driving mechanism, an upper end cover, a lower end cover and a connecting piece.

[0009] The valve body is cylindrical, and the left and right sides of the valve body are respectively provided with passage openings, and pipes are arranged at the passage openings; the left side is an inlet pipe, and the right side is an outlet pipe; the pipes are sealingly connected with the passage openings on the valve body; a transition conversion seat is arranged inside the valve body corresponding to the position of the outlet pipe; a conversion seat hole is arranged in the middle of the transition conversion seat, and the conversion seat hole is in communication with the outlet pipe; the transition conversion seat and the valve body are a split structure; the side of the transition conversion seat facing the center of the valve body is an inner side surface, which is a plane, and the plane of the inner side surface is parallel to the axis of the valve body; the side of the transition conversion seat facing away from the center of the valve body is an outer side surface, which is of any shape, and the outer side surface is sealingly connected with the inner wall of the valve body or with the outlet pipe inserted into the valve body; a valve plate is arranged on the left side of the inner side surface, and the valve plate is of any shape capable of completely covering the conversion seat hole; a valve plate driving mechanism is arranged at least at one of the upper part or the lower part of the valve plate; the valve plate driving mechanism is gas-liquid driven or electrically driven or a combination of gas-liquid driving and manual driving.

[0010] The valve plate can radially float relative to the center of the valve plate driving mechanism to compensate for the wear of the transition conversion seat and the valve plate and the gap therebetween.

[0011] Upper and lower end covers are arranged on the valve body, and the upper and lower end covers are sealingly connected with the valve body, and the valve plate driving mechanism is enclosed inside the valve body; an adapter is arranged at least at one of the upper end cover, the lower end cover or the upper and lower ends of the valve body.

[0012] Further, the valve plate driving mechanism inside the valve body is gas-liquid driven, and the valve plate driving mechanism is driven by the pressure difference between the inlet pipe and the outlet pipe itself;

[0013] The adapter is a gas-liquid joint, and the gas-liquid joint is connected with the inlet pipe or the outlet pipe through a control valve or a control pipeline;

[0014] A Bernoulli pressure boosting reduced diameter portion is arranged in the outlet pipe, and the equivalent diameter of the Bernoulli pressure boosting reduced diameter portion is smaller than the equivalent diameter of the outlet pipe;

[0015] One end of the control pipeline is inserted into the inside of the outlet pipe or the inside of the Bernoulli pressure boosting reduced diameter portion.

[0016] Further, the valve plate driving mechanism in the valve body is gas-liquid driven, and the valve plate driving mechanism is a piston type valve plate driving mechanism; the upper part of the valve body is a valve plate cavity accommodating the valve plate, the installation position section of the valve plate of the valve body is in any shape; the lower part of the valve body is a piston cavity, the piston cavity is internally provided with a piston assembly and a piston sealing element, and constitutes a piston type valve plate driving mechanism; the piston type valve plate driving mechanism is connected with the valve plate through a connecting plate, the connecting plate is provided with a channel, the channel is communicated with the inlet connecting pipe and the outlet connecting pipe; the valve plate can radially float relative to the center of the piston type valve plate driving mechanism, and the wear and the gap therebetween of the transition conversion seat and the valve plate are supplemented, the piston type valve plate driving mechanism drives the valve plate to axially move through the connecting plate, covers or opens the transition conversion seat hole;

[0017] The connecting plate and the valve plate are in a split or integrated structure.

[0018] The connecting pipe is connected to the inside of the inlet connecting pipe through the control valve, and is connected to the inside of the outlet connecting pipe or the inside of the Bernoulli pressure boosting reduced diameter part through the control pipeline, and the pass diameter of the control valve is greater than the pass diameter of the control pipeline.

[0019] Further, the valve plate driving mechanism in the valve body is gas-liquid driven; the upper part of the valve body is a small-diameter cavity, and the lower part is a large-diameter cavity, the cross-sectional area of the large-diameter cavity is greater than that of the small-diameter cavity, the large-diameter cavity is internally provided with a large-diameter piston driving assembly, and the small-diameter cavity is internally provided with a small-diameter piston driving assembly; the large-diameter cavity is connected with the valve plate through a connecting plate, and the small-diameter piston driving assembly is directly or indirectly connected to the valve plate; the valve plate driving mechanism is composed of the large-diameter and small-diameter piston driving assemblies and the connecting plate; the resultant force of the large-diameter and small-diameter piston driving assemblies drives the valve plate to move up and down, covers or opens the transition conversion seat hole;

[0020] The lower end or the lower end cover of the valve body is provided with a lower channel port, the lower channel port is provided with a connecting piece, the connecting piece is a gas-liquid connector or a control pipeline, the lower channel port is connected to the inside of the inlet connecting pipe through the control valve, and is connected to the inside of the outlet connecting pipe through the control pipeline, and the pass diameter of the control valve is greater than the pass diameter of the control pipeline;

[0021] The upper end or the upper end cover of the valve body is provided with an upper channel port, the upper channel port is provided with a connecting piece, the connecting piece is a gas-liquid connector or a control pipeline, and the upper channel port is connected to the inside of the outlet connecting pipe through the connecting piece.

[0022] Further, the valve plate driving mechanism in the valve body is gas-liquid driven; the valve body is divided into upper, middle and lower parts, the upper part of the valve body is a large-diameter cavity, the middle part of the valve body is a small-diameter cavity, the cross-sectional area of the large-diameter cavity is larger than that of the small-diameter cavity, a large-diameter piston driving assembly is arranged in the large-diameter cavity, and a small-diameter piston driving assembly is arranged in the small-diameter cavity; the large-diameter piston driving assembly is connected with the small-diameter piston driving assembly through a piston connecting rod to form a large-diameter and small-diameter piston driving assembly, the small-diameter piston driving assembly is directly or indirectly connected to the valve plate at the lower part, and the combined force of the large-diameter and small-diameter piston driving assemblies drives the valve plate to move up and down to cover or open the transition conversion seat hole;

[0023] The valve plate driving mechanism is composed of a large-diameter piston driving assembly, a piston connecting rod and a small-diameter piston driving assembly, and the three are in a split or integrated structure and are provided with an internal leakage passage;

[0024] An upper passage opening is formed in the upper part or the upper end cover of the valve body, a connecting piece is arranged on the upper passage opening, the connecting piece is a gas-liquid joint or a control pipeline, the upper passage opening is connected to the outlet connecting pipe through a control valve on the gas-liquid joint and the control pipeline, and the equivalent diameter of the control valve is larger than that of the leakage passage.

[0025] A middle passage opening is arranged at the transition position between the large-diameter cavity and the small-diameter cavity, and the middle passage opening is connected to the inside of the outlet connecting pipe through a control pipeline.

[0026] Further, the valve plate driving mechanism in the valve body is gas-liquid driven, and the valve plate driving mechanism is a piston type valve plate driving mechanism; the valve plate position cross section at the lower part of the valve body is in any shape, and the upper part is a piston cavity, the piston cavity is internally provided with the piston type valve plate driving mechanism; the piston type valve plate driving mechanism comprises a piston assembly, the valve plate is radially floating relative to the center of the piston assembly, the piston type valve plate driving mechanism drives the valve plate to move axially to cover or open the conversion seat hole.

[0027] The connecting piece is arranged on the valve body end or the upper end cover of the upper part of the piston cavity, the connecting piece is a gas-liquid joint, and the upper part of the piston cavity is connected to the inside of the outlet connecting pipe through a control valve on the gas-liquid joint.

[0028] The upper part of the piston cavity is communicated with the inlet connecting pipe through a control pipeline on the gas-liquid joint or through a leakage passage in the piston assembly.

[0029] The equivalent diameter of the control valve passage is larger than that of the control pipeline or the internal leakage passage.

[0030] Further, the valve plate driving mechanism in the valve body is electrically driven, and the valve plate driving mechanism is an electric driving mechanism.

[0031] The electric drive mechanism is arranged on the upper or lower part of the valve plate, and the electric drive mechanism is shielded and installed in the closed space in the valve body.

[0032] The electric drive mechanism is composed of a screw rod mechanism, a nut and an electric rotating unit. The nut is arranged at the middle axial position of the valve plate. One end of the screw rod mechanism is matched with the nut, and the other end is connected with the electric rotating unit. The nut can radially float relative to the valve plate, and the nut is axially bound on the valve plate and cannot rotate. The nut is matched with the screw rod mechanism. The electric rotating unit drives the screw rod mechanism to rotate, and the screw rod mechanism drives the nut to axially move, thereby driving the valve plate to axially move, and opening and closing the hole of the transition conversion seat.

[0033] The electric rotating unit contains an electric motor. The adapter is a terminal board. The electric motor is connected with the terminal board for power transmission and control.

[0034] The electric drive mechanism circuit is provided with a control circuit.

[0035] Further, the outlet pipe on the valve body is inserted into the inner cavity of the valve body, and the end thereof exceeds the inner wall of the valve body. The outer side of the transition conversion seat is directly installed on the end of the outlet pipe extending into the valve body. The outer side of the transition conversion seat and the end of the outlet pipe are installed in a sealing manner of one or more than two combinations of external sleeve sealing, internal insertion sealing and flat end sealing.

[0036] Further, at least one of the upper part or the lower part of the valve plate in the valve body is provided with a pressure maintaining elastic mechanism, which limits the maximum opening degree of the valve plate, and the elastic force of the pressure maintaining elastic mechanism also offsets part or all of the friction between the valve plate drive mechanism and the valve body.

[0037] Further, at least one of the upper part and the lower part of the valve plate in the valve body is provided with a power-assisted elastic member. The power-assisted elastic member is a compression spring or a tension spring, and the elastic force directly or indirectly acts on the valve plate to make the valve plate axially move.

[0038] Further, a valve plate pressing seat corresponding to the position of the inlet pipe is arranged in the valve body. A channel for fluid flow is arranged in the middle of the valve plate pressing seat. A pressing seat elastic member is arranged around the valve plate pressing seat. The elastic force of the pressing seat elastic member acts on the valve plate pressing seat, and the valve plate pressing seat presses on the valve plate, so that the valve plate generates pressure on the transition conversion seat. The valve plate pressing seat is not sealed with the inside of the valve body.

[0039] Further, the end of the upper end cover and the lower end cover on the valve body or the inner wall of the valve body is provided with a valve plate sliding rail mechanism. The valve plate sliding rail mechanism limits the radial position of the valve plate. Under the fluid pressure, the valve plate is stressed, the valve plate is stressed and pressed on the valve plate sliding rail mechanism, and the valve plate moves along the axial direction of the valve plate sliding rail mechanism.

[0040] The elastic sealing element is arranged between the outer side of the transition seat and the inner wall of the valve body or between the outer side of the transition seat and the corresponding connection position of the inlet pipe.

[0041] Further, a transition seat is additionally arranged at the corresponding inlet pipe position inside the valve body to realize the bidirectional opening and closing control of the valve; the transition seat is in a separate or integrated structure with the valve body.

[0042] Further, a recess is arranged on the valve plate inside the valve body, and a valve plate sealing seat is arranged in the recess; the valve plate sealing seat is tightly sealed with the inner side of the transition seat.

[0043] Further, a correction element is arranged in the piston cavity or the large / small diameter cavity inside the valve body to ensure the circular precision of the piston cavity or the large / small diameter cavity.

[0044] The transition seat is bound by the binding element or the recessed rib on the inlet pipe, and cannot move axially.

[0045] Further, the valve plate driving mechanism inside the valve body is gas-liquid driven, a hole is arranged on the upper end cover, a screw rod is arranged in the hole, and the screw rod is manually rotated; a nut hole is arranged on the valve plate, and a nut is arranged in the nut hole; the nut and the screw rod are matched, the nut does not rotate, and the nut floats in the hole along the radial direction to compensate the wear and free gap between the valve plate and the transition seat.

[0046] The screw rod is rotated to drive the nut to move up and down in the nut hole, and a lower platform is arranged at the lower part of the nut hole; when the nut moves to the position of the lower platform, the lower platform is pressed downward by the nut to drive the valve plate to move downward and close the transition seat channel, thereby closing the valve.

[0047] The height of the nut and the length from the upper end surface of the nut hole to the lower platform are greater than or equal to the distance of the downward movement of the valve plate, the upper part of the nut hole is in an open state, the upper part of the nut is not bound, and the nut cannot drive the valve plate to move upward.

[0048] The valve plate is directly or indirectly provided with a power-assisted elastic element, the valve plate is moved by the force of the power-assisted elastic element or the acting force of the pressure difference of the gas-liquid driving, and the valve is opened.

[0049] The utility model discloses an automatic full-closed low flow resistance two-way valve, through increasing transition conversion seat, make the complex curved surface inside the valve body that is difficult to seal face processing become easy to process plane structure, and, sealed plane is parallel with axis, and the problem of valve plate extrusion lock is not produced, adopt full-closed electric control mechanism, can guarantee reliable control, avoid the leakage of valve to outside simultaneously, still have manual and gas liquid dynamic double -control, and use control is more convenient, in addition, adopt big and small piston control system, utilize the front and back pressure difference of self system, and with the increasing pressure difference implementation, realize self pressure difference opening and closing, avoid the complexity of introducing external gas liquid pressure source, avoid the leakage to outside.

[0050] The utility model discloses the beneficial effect that:

[0051] 1, between the valve plate and the valve body inner wall connecting pipe, increase transition conversion seat, convert the irregular valve body inner wall surface or the connecting pipe end surface inserted in the valve body into plane seal, and because transition conversion seat is split structure, can have tiny activity space, this can make transition conversion seat and valve plate plane perfect cooperation, thereby the sealing property obtains the great improvement, and cost reduction;

[0052] 2, valve plate and transition conversion seat plane seal, and after wearing, valve plate can offset automatic compensation;

[0053] 3, adopt full-closed gas liquid motion or electric structure, realize the full-closed control of air conditioning fluorine system, and prevent the leakage;

[0054] 4, adopt big and small double piston structure, do not need to introduce external gas liquid pressure, can effectively realize low flow resistance fluid bidirectional control;

[0055] 5, adopt gas dynamic and manual double -control, realize the flexible use of arbitrary control;

[0056] 6, adopt the control logic of bernoulli increasing pressure difference and positive feedback positive excitation, make self pressure difference control more reliable. DRAWINGS

[0057] Figure 1 It is the electric two-way valve structure schematic drawing of the utility model;

[0058] Figure 2 It is the pneumatic two-way valve structure schematic drawing of the utility model;

[0059] Figure 3 It is the two piston drive two-way valve structure schematic drawing of the utility model;

[0060] Figure 4 It is another two piston drive cross section structure schematic drawing (facing flow direction) of the utility model;

[0061] Figure 5 is another driving system in the lower part of the structure of the utility model schematic view;

[0062] Figure 6 is the driving system in the upper part of the structure of the utility model schematic view;

[0063] Figure 7 is the valve plate with the valve plate sealing seat and the transition conversion seat welding installation of the utility model top structure schematic view;

[0064] Figure 8 is the top structure schematic view of the utility model with valve plate pressure seat;

[0065] Figure 9 is the top structure schematic view of the utility model with slide rail.

[0066] In the drawing: 1 valve body, 2 inlet pipe, 3 outlet pipe, 4 valve plate, 5 transition conversion seat, 501 conversion seat hole, 502 inner side, 503 outer side, 6 valve plate drive mechanism, 7 upper end cover, 8 lower end cover, 9 connecting piece, 10 valve plate pressure seat, 101 pressure seat elastic piece, 102 pressure seat channel, 11 restraint, 12 electric drive mechanism, 121 screw mechanism, 122 nut, 123 electric rotating unit, 124 wiring terminal plate, 125 control circuit, 13 power-assisted elastic piece, 14 manual screw rod, 141 nut hole, 142 lower platform, 143 shaft seal, 15 piston type valve plate drive mechanism, 151 piston assembly, 152 gas-liquid joint, 153 piston sealing element, 154 control pipeline, 16 piston cavity, 161 small diameter cavity, 162 large diameter cavity, 163 upper channel opening, 165 small diameter piston drive assembly, 166 large diameter piston drive assembly, 167 lower channel opening, 168 inner leakage channel, 169 middle channel opening, 17 valve plate slide rail mechanism, 18 transition conversion seat boss, 19 sensor, 20 elastic sealing element, 21 control valve, 22 correction element, 23 connecting plate, 24 piston connecting rod, 25 pressure maintaining elastic mechanism, 26 valve plate sealing seat, 27 sight glass, 28 Bernoulli pressure-increasing reduced diameter portion, 31 axial direction, 32 radial direction. DETAILED DESCRIPTION

[0067] In order to better understand and implement, the utility model is described in detail below in conjunction with the drawings.

[0068] As Figure 1 shown, it is a kind of fully-enclosed low flow resistance electric two-way valve, by valve body 1, inlet pipe 2, outlet pipe 3, valve plate 4, transition conversion seat 5, valve plate drive mechanism 6, upper end cover 7, lower end cover 8 and connecting piece 9 are formed;

[0069] The valve body 1 is a cylindrical shape with an arbitrary cross section, and a passage opening is formed on the left and right sides of the lower part of the valve body 1, and a pipe is connected to the passage opening. The left side is an inlet pipe 2, and the right side is an outlet pipe 3. The pipe is sealingly connected to the passage opening on the valve body 1. A transition seat 5 is installed inside the valve body 1 corresponding to the position of the outlet pipe 3. The transition seat 5 is made of any material such as metal or non-metal. The manufacturing process of the transition seat 5 and the connection process with the valve body 1 can be any process such as machining, forging, casting, injection molding, and welding. The transition seat 5 can also be made of a combination of two or more metal materials. The transition seat 5 has a seat hole 501 in the middle. The seat hole 501 can be any shape, preferably circular or square, to facilitate linear flow control. The seat hole 501 is connected to the outlet pipe 3. The transition seat 5 is a separate structure from the valve body 1. The inner side 502 of the transition seat 5 faces the center side of the valve body 1. The inner side 502 is a flat surface parallel to the axis of the valve body 1. A valve plate 4 is installed on the left side of the inner side 502 of the transition seat 5. The valve plate 4 can be any shape that completely covers the seat hole 501. The valve plate 4 can be a flat plate, a wedge-shaped plate, or a plate with a boss or a pit.

[0070] The transition seat 5 is a separate structure, which can have a small moving space, allowing the transition seat 5 to perfectly match the flat surface of the valve plate 4, thereby greatly improving the sealing performance and reducing the production cost.

[0071] The outlet pipe 3 is inserted into the valve body 1 and extends beyond the inner wall of the valve body 1. The end of the pipe inserted into the valve body is planed. The outer side 503 of the transition seat 5 is directly installed on the end of the pipe inserted into the valve body 1. The outer side 503 of the transition seat 5 is sealingly installed on the end of the pipe by means of a sleeve, an internal plug, or a planar sealing installation.

[0072] An elastic sealing member 20 is installed between the outer side 503 of the transition seat 5 and the corresponding pipe connection end surface. Under the elastic force of the elastic sealing member 20, the transition seat 5 is pressed against the valve plate 4.

[0073] The valve plate 4 is installed on the inner side 502 of the transition seat 5 facing the center side. The valve plate 4 can be any shape that completely covers the seat hole 501. A valve plate driving mechanism 6 is installed on the upper part of the valve plate 4. The valve plate driving mechanism 6 is an electric driving mechanism 12.

[0074] An upper end cover 7 and a lower end cover 8 are installed on the upper and lower parts of the valve body 1, respectively. The upper and lower end covers are sealingly connected to the valve body 1 by welding, pressing, or bolt fixing.

[0075] The electric drive mechanism 12 shields the closed space installed in the valve body 1; the electric drive mechanism 12 is composed of a screw rod mechanism 121, a nut 122 and an electric rotating unit 123; the nut 122 is installed at the middle axial position of the valve plate 4, one end of the screw rod mechanism 121 is matched with the nut 122, and the other end is connected with the electric rotating unit 123; the electric rotating unit 123 contains a motor, which can be a direct current motor;

[0076] The nut 122 can be radially 32 floated relative to the valve plate 4, and the valve plate can be offset to compensate the wear and the gap between the transition conversion seat 5 and the valve plate 4; the nut 122 is axially bound on the valve plate 4, and the nut 122 cannot rotate; the nut 122 is matched with the screw rod mechanism 121, the electric rotating unit 123 drives the screw rod mechanism 121 to rotate, the screw rod mechanism 121 drives the nut 122 to move axially, thereby driving the valve plate 4 to move axially, opening and closing the transition conversion seat hole 501;

[0077] The upper end cover 7 is installed with a connecting piece 9; the connecting piece 9 is a terminal block 124, and the motor is conducted with electric energy transmission and control through the terminal block 124;

[0078] The electric drive mechanism 12 circuit has a control circuit 125; the control circuit 125 adopts switching direct current motor positive and negative poles to control the forward and reverse rotation, thereby controlling the opening and closing of the valve; the opening and closing of the control switch is realized to realize the on-off of the current; the control circuit 125 can also be used for opening degree control, rotation speed control, overload and overcurrent protection control, time control and anti-interference control, etc.;

[0079] The valve body 1 is also inserted into the inside of the valve body 1 corresponding to the inlet pipe 2, and the transition conversion seat is also installed with the outlet pipe 3, thereby realizing the function that the two-way valve can be controlled to be closed in both directions;

[0080] The control circuit 125 can adopt the way of changing the phase to control the forward and reverse rotation of the motor, thereby controlling the opening and closing of the valve plate 4;

[0081] Working principle: when the two-way valve is in the closed state, the control circuit 125 inputs the forward direct current through the terminal block 124, the electric rotating unit 123 is powered on, and starts to rotate forward, since the screw rod mechanism 121 is connected with the electric rotating unit 123, the screw rod mechanism 121 rotates, since the nut 122 is axially bound on the valve plate, the screw rod mechanism 121 drives the nut 122 to move upward, thereby driving the valve plate 4 to move upward, opening the transition conversion seat hole 501, and the valve is opened;

[0082] If the valve needs to be closed at this time, only need to control circuit 125 to add reverse voltage, electric rotating unit 123 reverse rotation, electric rotating unit 123 drive screw mechanism 121 reverse rotation, screw mechanism 121 drive nut 122 down, nut 122 drive valve plate 4 down, valve plate 4 cover transition conversion seat hole 501, valve closed;

[0083] In the driving screw 121 and nut 122 up and down the end position, provided with screw overload protection mechanism, prevent screw overuse wear and tear affect the life, screw overload protection mechanism can draw lessons from the protection mode of electronic expansion valve or other can prevent screw and nut overload of any mode.

[0084] In addition, can also be installed on the lower end cover 8 sensor 19, can detect the position of valve plate 4, in order to alarm and control; In, out of the pipe are provided with transition conversion seat, so as to realize the function of two-way closing; Electric rotating unit motor can also choose AC motor, synchronous motor, stepper motor, servo motor and any form of motor with reducer motor.

[0085] As Figure 2 Shown is a kind of fully enclosed low flow resistance pneumatic two-way valve, by valve body 1, inlet pipe 2, outlet pipe 3, valve plate 4, transition conversion seat 5, valve plate drive mechanism 6, upper end cover 7, lower end cover 8 and link 9 composition;

[0086] Valve body 1 section is any shape of cylindrical, wherein the upper part can accommodate valve plate 4 any section shape, valve body 1 left and right sides are provided with two passageway, passageway position installs the pipe, pipe can be corrugated pipe, left side is inlet pipe 2, right side is outlet pipe 3, pipe and passageway on valve body 1 seal connection;In the valve body 1 inside corresponding outlet pipe 3 position installs transition conversion seat 5, transition conversion seat 5 middle part has conversion seat hole 501, conversion seat hole 501 is communicated with outlet pipe 3;Transition conversion seat 5 and valve body 1 are split structure, transition conversion seat 5 towards valve body center side is inner side 502, inner side 502 is plane, the plane of inner side 502 is parallel to the axis of valve body 1;Transition conversion seat 5 left side of inner side 502 installs valve plate 4, valve plate 4 is any shape that can completely cover conversion seat hole 501;Transition conversion seat 5 away from valve body center, towards valve body 1 inner wall side is outer side 503, outer side 503 is any shape, outer side 503 and valve body 1 inner wall or with the outlet pipe 3 inserted in the inner wall of valve body 1 seal connection;

[0087] Outlet pipe 3 inserts into valve body 1 into valve body 1 inner cavity, its end exceeds valve body 1 inner wall;And end face is planed, transition conversion seat 5 outer side 503 is directly installed in the pipe end inserted into valve body 1;Transition conversion seat 5 outer side 503 is combined and sealedly installed in the pipe end by way of outer sleeve installation, inner plug installation, pipe end plane seal installation etc.

[0088] In addition to the above solutions, the outer side surface 503 of the transition seat 5 and the passage of the valve body 1, or the outer side surface 503 of the transition seat 5 and the inner wall or outer wall of the connecting pipe, can adopt various forms of tapered sealing connection, etc.

[0089] An elastic sealing member 20 is installed between the outer side surface 503 of the transition seat 5 and the corresponding connecting end surface of the connecting pipe; at this time, the elastic sealing member 20 is composed of two parts of a spring and an O-ring, and the inner side surface 502 of the transition seat 5 is pressed on the valve plate 4 under the spring force;

[0090] The inlet connecting pipe 2 is inserted into the interior of the valve body, and the valve plate pressing seat 10 is installed at the end of the inlet connecting pipe 2, the valve plate pressing seat 10 has a passage that can allow fluid to flow through, and the valve plate pressing seat 10 is peripherally provided with a pressing spring 101, the pressing force of the pressing spring 101 acts on the valve plate pressing seat 10, the valve plate pressing seat 10 is pressed on the valve plate 4, and the valve plate 4 generates a static pressure on the transition seat 5; the valve plate pressing seat 10 is not sealed to the interior of the valve body 1; the mating surface of the valve plate pressing seat 10 and the valve plate 4 is parallel to the axis, or can form an angle with the axis;

[0091] The valve plate 4 is provided with a valve plate driving mechanism 6 at the lower part; the valve plate driving mechanism 6 is a gas-liquid driven type, the lower part of the valve body 1 is a piston cavity 16, the piston cavity 16 is provided with a correcting member 22 and a piston type valve plate driving mechanism 15, the piston type valve plate driving mechanism 15 is composed of a piston assembly 151 and a piston sealing member 153, the piston type valve plate driving mechanism 15 can move up and down between the piston cavity 16 and is sealed by the piston sealing member 153, the piston type valve plate driving mechanism 15 is connected with the valve plate 4 through a connecting plate 23, the connecting plate 23 has a passage that connects the inlet connecting pipe 2 and the outlet connecting pipe 3; the valve plate 4 has a radial gap 32 floating relative to the center of the piston type valve plate driving mechanism 15, the valve plate can be offset to compensate for the wear of the transition seat 5 and the valve plate 4 and the gap therebetween, the piston type valve plate driving mechanism 15 drives the valve plate 4 to move axially through the connecting plate 23; covers or opens the transition seat hole 501; the connecting plate 23 and the valve plate 4 can form a component;

[0092] The connecting plate 23 is installed at the lower part of the valve plate 4, the connecting plate 23 is connected with the piston type valve plate driving mechanism 15, the lower part of the piston type valve plate driving mechanism 15 is provided with a power-assisted elastic member 13 between the lower end cover 8, the power-assisted elastic member 13 is a compression spring, the spring force acts to make the valve plate 4 move axially to open the two-way valve;

[0093] The lower end cover 8 is provided with a connecting member 9, the connecting member 9 is a gas-liquid connector 152, the gas-liquid connector 152 is connected to the interior of the inlet connecting pipe 2 through a control valve 21 and is connected to the interior of the outlet connecting pipe 3 through a thin control pipeline 154, the control valve 21 has a larger diameter than the control pipeline 154;

[0094] Valve plate driving mechanism 6 uses the self gas-liquid pressure difference in the inlet and outlet pipe to drive;

[0095] Bernoulli pressure boosting section 28 is installed in outlet pipe 3, the equivalent diameter of Bernoulli pressure boosting section 28 is smaller than that of outlet pipe 3, and Bernoulli pressure boosting section 28 adopts direct reducing diameter or reducing diameter throat structure;

[0096] One end of control pipeline 154 is inserted into outlet pipe 3 or Bernoulli pressure boosting section 28;

[0097] A hole is opened on upper end cover 7, and manual screw 14 is installed in the hole; valve plate 4 has nut hole 141, nut is installed in nut hole 141, nut cooperates with manual screw 14, nut cannot rotate, and nut can float in radial direction 32 in nut hole 141 to compensate the wear and free gap of valve plate 4 and transition conversion seat 5;

[0098] Manual screw 14 rotates, and nut moves along up and down axial direction 31 in nut hole 141, lower surface 142 is arranged at the lower part of nut hole 141, lower surface 142 is pressed downward by nut, and valve plate 4 is driven to move downward to close the channel of transition conversion seat 5, so that manual closing valve is realized;

[0099] The height of nut and the length from the upper end surface of nut hole 141 to lower surface are greater than or equal to the moving distance of valve plate 4, the upper part of nut hole 141 is open, the upper part of nut is not restricted, and nut cannot drive valve plate 4 to move upward;

[0100] Sealing piece 143 is installed at the outlet shaft position of manual screw 14 on upper end cover 7 to prevent external leakage, and sealing cap can be installed on the upper part of upper end cover 7 to seal when manual operation is not performed;

[0101] When manual closing valve is performed, valve plate 4 is pressed to the lowermost end by nut 122, and the gas-liquid driving function is lost;

[0102] When manual reverse rotation is performed, free space is generated between nut and lower surface 142, and the gas-liquid driving mechanism can realize gas-liquid control opening and closing.

[0103] Working principle:

[0104] The inlet pipe 2 is connected to the system, and the inlet pipe 2 contains pressure fluid; at this time, the valve manual control mechanism is in the open valve state, when the control valve 21 is closed, the piston valve plate driving mechanism 15, the lower cavity is connected to the outlet pipe 3 through the thin control pipe 154 on the connecting piece 9, the lower surface of the piston valve plate driving mechanism 15 is equal to the pressure in the outlet pipe 3, and the upper surface of the piston valve plate driving mechanism 15 is communicated with the inner cavity of the valve body, and the valve plate pressing seat 10 at the end of the inlet pipe 2 is pressed against the valve plate 4 but is not sealed, so the internal pressure of the valve body is equal to the pressure in the inlet pipe 2, that is, the pressure on the upper surface of the piston valve plate driving mechanism 15 is equal to the pressure in the inlet pipe 2, and since there is a pressure difference between the inlet pipe and the outlet pipe, the piston valve plate driving mechanism 15 is forced to move downward, the connecting plate 23 is driven by the piston valve plate driving mechanism 15, the connecting plate 23 drives the valve plate 4 to move downward, the lower part of the piston valve plate driving mechanism 15 is compressed, the valve plate 4 is driven to move downward to close the hole of the transition seat 501, and the valve is closed.

[0105] In the initial process of closing the valve plate 4, although the pressure difference is small at the beginning, the power generated is small, but at this time, the assisting elastic member 13 is also in a relaxed state, although the elastic force is a resistance, the elastic force is also small or even 0, as long as the pressure difference before and after the two-way valve is adjusted, the piston valve plate driving structure can be started to move downward, once the piston valve plate driving mechanism 15 moves downward, the area of the valve plate blocking the transition seat hole 501 increases, that is, the flow area decreases, the fluid is throttled, thereby increasing the pressure difference between the inlet pipe and the outlet pipe of the two-way valve, further increasing the downward pressure of the piston valve plate driving structure 15, although the compression amount of the assisting elastic member 13 increases, the elastic force increases, but the increased elastic force is not enough to offset the increased thrust of the piston valve plate driving structure 15, so the valve plate driving structure 15 can still push the valve plate 4 to move downward, thereby fully closing the valve.

[0106] The force generated by the above-mentioned piston valve plate driving mechanism 15 and the area of the valve plate 4 covering the transition seat hole 501 is a positive feedback process and a positive incentive effect.

[0107] When the two-way valve needs to be opened, the control valve 21 is opened. Although the lower part of the piston-type valve plate driving mechanism 15 is connected to the interior of the outlet pipe 3 by a control pipe 154 thin tube, the diameter of the control valve 21 is larger than the diameter of the control pipe 154 thin tube, and the throttling effect of the thin tube causes the pressure at the lower part of the piston-type valve plate driving mechanism 15 to be close to the internal pressure of the inlet pipe 2, and the pressure at the upper part of the piston-type valve plate driving mechanism 15 is also almost equal to the pressure in the inlet pipe 2. Therefore, the pressure difference between the upper and lower parts of the piston-type valve plate driving mechanism 15 is almost 0. At this time, the assisting elastic member 13 is in a compressed state, and the elastic force is at its maximum state. At this time, the elastic force is sufficient to overcome the static friction between the valve plate 4 and the transition conversion seat 5, and generate movement. Under the elastic force of the assisting elastic member 13, the valve plate 4 opens the transition conversion seat hole 501, thereby opening the valve.

[0108] During the opening process, the elastic force of the assisting elastic member 13 decreases as the valve plate 4 rises. At this time, the friction between the valve plate 4 and the transition seat 5 is also reduced due to the reduction of the pressure difference between the inlet and outlet pipes. When the valve plate 4 reaches the uppermost open position, the valve is opened, the pressure difference between the inlet and outlet pipes is minimized, the friction between the valve plate 4 and the transition seat is minimized, and the elastic force of the assisting elastic member 13 is also minimized. Since the opening process is always in a positive feedback loop state, the valve can be reliably opened.

[0109] At the terminal position of the valve opening or closing, a limiting mechanism may be provided to limit the final position of the valve plate 4, and the limiting mechanism may also be provided to damp the movement of the valve plate;

[0110] Working principle of the Bernoulli booster compression diameter portion 28: After the Bernoulli booster compression diameter portion 28 is reduced in diameter, the fluid flow rate increases. According to the Bernoulli equation, the faster the fluid flow rate, the lower the pressure generated, thereby generating a larger driving pressure difference, which can enhance the opening and closing control of the valve plate 4 and make the control more reliable.

[0111] like Figure 3 As shown, it is a double-piston driven two-way valve. The valve body 1 is divided into three parts: upper, middle and lower. The upper part is a small-diameter cavity 161, which can accommodate the valve plate 4. The middle part of the valve body 1 is for installing the transition conversion seat 5 and the connecting pipe position. The lower part is a large-diameter cavity 162. The cross-sectional area of ​​the large-diameter cavity 162 is larger than the cross-sectional area of ​​the small-diameter cavity 161. The large-diameter piston drive assembly 166 is installed in the large-diameter cavity 162, and the small-diameter piston drive assembly 165 is installed in the small-diameter cavity 161; the large-diameter cavity is connected to the valve plate 4 through a connecting plate 23, and the connecting plate 23 has a channel hole. The small-diameter piston assembly 165 is directly or indirectly connected to the valve plate 4. The combined force of the large and small-diameter piston drive assemblies drives the valve plate 4 to move along the upper and lower axial directions; the transition conversion seat hole 501 is covered or opened; the large and small-diameter piston assemblies use bowl-shaped seals;

[0112] The valve body 1 lower part of the large diameter cavity 162 is provided with a lower passage port 167, and the adapter 9 is installed on the lower passage port 167. The adapter 9 is the control pipeline 154. The lower passage port 167 is connected to the inlet pipe 2 through the control valve 21, and the control pipeline 154 is connected to the Bernoulli pressure boosting reduced diameter part 28 through the thin tube. The equivalent diameter of the Bernoulli pressure boosting reduced diameter part 28 is smaller than the equivalent diameter of the outlet pipe 3, the fluid flow rate is accelerated, and the internal pressure is reduced;

[0113] The equivalent diameter of the control valve 21 is larger than the equivalent diameter of the control pipeline 154 connected to the outlet pipe 3;

[0114] The upper part of the small diameter cavity 161 is provided with an upper passage port 163, and the adapter 9 is installed on the upper passage port 163. The adapter 9 is the control pipeline 154. The upper passage port 163 is connected to the inside of the outlet pipe 3 through the adapter 9 and the control pipeline 154;

[0115] A manual control mechanism is installed at the position of the upper end cover 7. The manual control mechanism is the same as Figure 2 ;

[0116] A pressure maintaining elastic mechanism 25 is installed at the lower part of the upper end cover 7 in the valve body 1. The pressure maintaining elastic mechanism 25 can limit the maximum opening of the valve plate, prevent the pressure difference between the inlet pipe and the outlet pipe from being too small, and affect the reliability of the closing. At the same time, the elastic force generated by the pressure maintaining elastic mechanism 25 also plays a role in offsetting the static friction of the piston type valve plate driving structure. The pressure maintaining elastic mechanism 25 can be adjusted in height and stress, so as to adjust the maximum opening of the valve plate 4.

[0117] Working principle:

[0118] When the manual control mechanism makes the valve plate 4 in the open state, the gas-liquid dynamic piston control mechanism can work normally. The large diameter piston driving assembly 166 and the small diameter piston driving assembly 165 are combined into the valve plate driving mechanism 6.

[0119] When the two-way valve is in the working state, the inlet pipe 2 is connected to the system, and there is a pressure in the inside of the valve body. In the initial state, the valve plate blocks the conversion seat hole 501, and the two-way valve is in the closed state. At this time, if the two-way valve is to be opened, the control valve 21 is opened, and the high pressure gas in the inlet pipe 2 enters the lower part of the large piston assembly 166 through the control valve 21. Although the lower passage port 167 is also connected to the outlet pipe 3 through the thin tube, due to the throttling effect of the thin tube, the lower part of the large diameter piston driving assembly 166 will still maintain a pressure close to that in the inlet pipe 2. Since the inlet pipe 2 is not sealed with the inner cavity of the valve body 1, the pressure in the upper part of the large diameter piston driving assembly 166 is almost the same as that in the inlet pipe 2, that is, the pressure in the upper and lower parts of the large diameter piston driving assembly 166 is almost the same, and the large piston assembly 166 is almost not stressed.

[0120] At this time, the upper part of the small-diameter piston driving assembly 163 is connected to the inside of the outlet connector 3 through the control pipeline 154 on the upper passage port 163, that is, the pressure of the upper part of the small-diameter piston driving assembly 163 is equal to the pressure of the outlet connector, and the pressure of the lower part is equal to the pressure inside the inlet connector 2. At this time, since the two-way valve is in the closed state, the pressure difference between the inlet and outlet connectors is the largest, so the upward pulling force of the small-diameter piston driving assembly 163 is in the maximum state, and the upward and downward forces of the large-diameter piston driving assembly 166 are almost zero. The resultant force of the small and large-diameter piston driving assemblies acting on the valve plate 4 is an upward force, so the valve plate 4 moves upward to open the transition conversion seat hole 501, thereby opening the valve. During the opening process, as the pressure difference between the inlet and outlet connectors decreases, the friction between the valve plate 4 and the transition conversion seat 5 also decreases, and the upward pulling force of the small-diameter piston driving assembly 163 also decreases, until the valve plate 4 is opened to a certain degree to generate a pressure difference, and the valve cannot be opened any more;

[0121] At this time, the equivalent diameter of the Bernoulli booster reduced diameter part 28 is smaller than the equivalent diameter of the outlet connector 3, and according to the Bernoulli principle, a lower control pressure is generated. The cross-sectional area of the small piston assembly 163 is larger than the cross-sectional area of the transition conversion seat hole 501, and when the valve plate 4 is fully opened, the friction is almost zero.

[0122] Therefore, the pressure loss of the inlet and outlet connectors of the two-way valve is very low at this time.

[0123] When the two-way valve needs to be closed, the control valve 21 is switched from open to closed. At this time, the pressure of the lower part of the large-diameter piston driving assembly 166 flows to the inside of the outlet connector 3 through the thin tube, so that the pressure of the lower part of the large-diameter piston driving assembly 166 is equal to the pressure inside the outlet connector 3. At this time, the pressure of the upper part of the large-diameter piston driving assembly 166 is equal to the pressure inside the inlet connector 2. Since there is a pressure difference between the inlet and outlet connectors of the two-way valve, the large-diameter piston driving assembly 166 generates a downward force. At this time, the upper and lower parts of the small-diameter piston driving assembly 163 also have a pressure difference between the inlet and outlet connectors, generating an upward force. Since the cross-sectional area of the large-diameter piston driving assembly 166 is larger than that of the small-diameter piston driving assembly 163, the downward force of the large-diameter piston driving assembly is greater than the upward force of the small-diameter piston driving assembly. Therefore, the resultant force acting on the valve plate 4 is downward, and the resultant force drives the valve plate 4 to move downward. As the valve plate 4 moves downward, the area of the transition conversion seat hole 501 covered by the valve plate 4 becomes larger and larger, and the pressure difference generated by the inlet and outlet connectors becomes larger and larger. Since the cross-sectional areas are different, the downward force generated by the large-diameter piston driving assembly 166 is always greater than the pressure of the small-diameter piston driving assembly 163, and the resultant force will become larger and larger. Even if the friction between the valve plate 4 and the transition conversion seat 5 increases, the valve plate 4 can still be driven downward to close the transition conversion seat hole 501, thereby closing the valve.

[0124] During the movement process, the large and small-diameter piston driving assemblies generate greater forces under the action of the Bernoulli booster reduced diameter part 28, making it easier and smoother to drive the valve plate 4.

[0125] A manual control mechanism is installed on the upper end cover 7, which can close the valve. When the valve is closed, the gas-liquid valve plate driving mechanism can no longer be controlled.

[0126] A damping mechanism can also be installed at the transition position of the large and small piston cavities to prevent impact during the movement of the valve plate. The damping mechanism can be a leakage damping, a friction damping, or a compression damping.

[0127] As shown in Figure 4 , it is a two-way valve driven by a double piston,

[0128] A valve plate slide rail mechanism 17 is installed on the upper and lower end covers. The valve plate slide rail mechanism 17 limits the radial 32 position of the valve plate 4. Under fluid pressure, the valve plate 4 is forced against the valve plate slide rail mechanism 17, and the valve plate 4 can move axially along the valve plate slide rail mechanism 17. The slide rail 17 can use a roller slide rail or other low-friction coefficient material, and the friction generated by the axial 31 movement is low.

[0129] A hole is opened in the middle wall thickness position of the valve plate 4. The upper part of the hole has a necking step. A booster elastic member 13 is installed in the hole. The upper part of the booster elastic member 13 acts on the necking step in the hole, and the lower part of the booster elastic member 13 acts on the upper part of the lower end cover 8. The elastic force keeps the two-way valve in the open state.

[0130] As shown in Figure 1 , an elastic sealing member 20 is installed between the transition conversion seat 5 and the outlet pipe 3. The elastic sealing member 10 has two parts, one part is a spring, and the other part is a sealing ring between the transition conversion seat 4 and the pipe 3. Under the action of the elastic force, the transition conversion seat 5 is pressed against the valve plate 4, and has a small floating under the premise of ensuring sealing with the pipe 3, and is tightly sealed with the valve plate.

[0131] The valve body 1 is divided into upper, middle and lower three parts. The upper part is a large-diameter cavity 162. The middle part of the valve body 1 is a small-diameter cavity 161, which can accommodate the valve plate 4. The lower part of the valve body 1 is the position for installing the transition conversion seat 5 and the inlet and outlet pipes.

[0132] The cross-sectional area of the large-diameter cavity 162 is larger than that of the small-diameter cavity 161. A large-diameter piston driving assembly 166 is installed in the large-diameter cavity 162, and a small-diameter piston driving assembly 165 is installed in the small-diameter cavity 161. The large-diameter piston assembly 166 in the large-diameter cavity is connected with the small-diameter piston driving assembly 165 through a piston connecting rod 24. The lower part of the small-diameter piston assembly 165 is directly or indirectly connected to the valve plate 4. The combined force of the large and small diameter piston driving assemblies drives the valve plate 4 to move along the upper and lower axial 31. The transition conversion seat hole 501 is covered or opened.

[0133] The large-diameter piston driving assembly 166, the piston connecting rod 24 and the small-diameter piston driving assembly 165 are provided with an inner leakage passage 168 in the large-diameter cavity 162, the inner leakage passage 168 is communicated with the inner cavity of the valve body lower part, and the inner cavity of the valve body is not sealed with the inlet pipe 2; the large-diameter piston driving assembly 166, the piston connecting rod 24 and the small-diameter piston driving assembly 165 can be an integrated structure;

[0134] An upper passage opening 163 is arranged at the upper end of the valve body 1 of the large-diameter cavity 162 or the top end of the upper end cover 7, and a connecting piece 9 is arranged on the upper passage opening 163, the connecting piece 9 is a gas-liquid joint 152 or a connecting pipe, the upper passage opening 163 is connected to the outlet pipe 3 through a control valve 21, and the equivalent diameter of the control valve 21 is larger than that of the leakage passage 168;

[0135] A middle passage opening 169 is arranged at the transition position between the large-diameter cavity 162 and the small-diameter cavity 161, and a connecting pipe is arranged in the middle passage opening 169;

[0136] A damping mechanism for the movement of the piston is arranged at the transition position between the large-diameter cavity 162 and the small-diameter cavity 161; the damping mode is compression damping, leakage damping or friction damping or any other form;

[0137] A pressure maintaining elastic mechanism 25 is arranged at the lower part of the upper end cover 7, which can limit the maximum opening of the valve plate 4, keep the pressure difference between the inlet pipe and the outlet pipe from being too small, prevent the opening from being too large to cause the valve to lose the pressure difference and be unable to be closed, and promote the closing of the valve.

[0138] Working principle:

[0139] The large-diameter piston driving assembly 166, the small-diameter piston driving assembly 165 and the piston connecting rod 23 are integrated into a valve plate driving mechanism 6;

[0140] When the two-way valve is in operation, the inlet pipe 2 is connected to the fluid system, and the inside of the inlet pipe 2 has high pressure. If the valve plate 4 does not block the conversion seat hole 501 at this time, the two-way valve is in an open state, and the control valve 21 is also in an open state at this time.

[0141] If the valve is to be closed, the control valve 21 is closed. Since the inlet pipe 2 is communicated with the inner cavity of the valve body, the high-pressure refrigerant enters the upper part of the large-diameter piston assembly 166 through the leakage passage 168. Since the control valve 21 is closed at this time, the pressure in the upper part of the large-diameter piston assembly 166 is the pressure in the inlet pipe 2 in the valve body 1;

[0142] The middle passage opening 169 is connected to the outlet pipe 3 through a control pipeline 154, the large-diameter piston control assembly 166, the upper part is the pressure in the inlet pipe 2, and the lower part is the pressure in the outlet pipe 3. The large-diameter piston control assembly 166 is acted on by the pressure difference between the inlet and outlet, and generates a downward force.

[0143] At this time, the pressure at the lower part of the small-diameter piston drive assembly 165 is connected to the inner cavity of the valve body and is equal to the pressure in the inlet pipe 2. The pressure at the upper part is equal to the pressure in the outlet pipe 3, generating an upward force. Since the cross-sectional area of ​​the large-diameter piston drive assembly 166 is larger than that of the small-diameter piston drive assembly 165, the resultant force on the piston connecting rod 24 is downward, thereby driving the valve plate 4 to move downward, the valve plate 4 blocks the conversion seat hole 501, and closes the two-way valve.

[0144] In this state, the large-diameter and small-diameter piston assemblies are sealed with the large-diameter and small-diameter cavities and can move along the axial direction 31 .

[0145] When it is necessary to open again, the control valve 21 is opened, and the pressure on the upper part of the large-diameter piston drive assembly 166 leaks into the outlet pipe 3 through the control valve 21. At this time, the outlet pipe pressure is in the lower part of the large-diameter piston drive assembly and the middle cavity, so the upper and lower pressure differences of the large-diameter piston drive assembly 166 are close, and the large-diameter piston drive assembly 166 does not generate force; at this time, since the inlet pipe 2 and the interior of the valve body 1 are not sealed, the internal pressure of the valve body is equal to the pressure in the inlet pipe 2, so the small-diameter piston drive assembly 165 has the internal pressure of the valve body at the lower part, and the upper part is equal to the pressure of the outlet pipe 3 because the control line 154 is connected to the outlet pipe 3. Due to the pressure difference between the inlet and outlet pipes, the small-diameter piston drive mechanism 165 generates an upward force, while at this time, the large-diameter piston drive assembly 166 does not generate any force. The combined force of the large and small-diameter piston drive assemblies is ultimately upward, and the valve plate 4 is subjected to the upward force and moves upward, and the valve plate 4 opens the transition conversion seat hole 501, so that the two-way valve is opened;

[0146] When the large-diameter piston drive assembly 166 moves upward to the position of the pressure-maintaining elastic mechanism 25, the force of the spring prevents the valve plate from rising further, thereby ensuring that the pressure difference between the inlet and outlet pipes is not too small when the valve is at its maximum opening, ensuring that there is sufficient pressure difference to close the valve. At the same time, the elastic force generated by the spring also serves to offset the friction of the piston valve plate drive structure.

[0147] The pressure-maintaining elastic mechanism 25 can be equipped with a manual adjustment mechanism to adjust the spring pressure, thereby adjusting the pressure difference required for reliable closure.

[0148] The pressure-maintaining elastic mechanism 25 is different from the boosting elastic member 13. The pressure-maintaining elastic mechanism 25 generates a force on the valve plate 4 only when the valve is at the end of opening, thereby promoting valve closing. The boosting elastic member 13 generally acts on the valve plate throughout the entire process in order to open the valve.

[0149] In addition, a sight glass 27 can be installed on the upper end cover 7 to observe the working status of the valve.

[0150] like Figure 5 As shown, it is a two-way valve with the drive system at the bottom.

[0151] Valve plate driving mechanism 6 is also a gas-liquid piston type valve plate driving mechanism; the upper part of valve body 1 is a cavity that can accommodate valve plate 4; a transition conversion seat restraint 11 is installed inside valve body 1; restraint 11 prevents the upward movement of the transition conversion seat; restraint 11 can also have the function of a correcting member, or the correcting member is integrated with restraint 11; the correcting member has the function of making the piston cavity circular.

[0152] A booster spring 13 is installed between valve plate 4 and upper end cover 7; booster spring 13 is a tension spring; the tension of booster spring 13 causes valve plate to move upward to open the valve; the middle part of valve body 1 is an inlet and outlet connector; outlet connector 3 is inserted into the inside of valve body 1, and the end face is planed; a transition conversion seat 5 is installed at the end of the connector; inlet connector 2 is inserted into valve body 1; valve plate pressing seat 10 is installed at the end of inlet connector 2; a concave rib is installed at the position of transition conversion seat 5 in the middle part of valve body 1 and the transition position of the lower part of valve body 1; the concave rib blocks the downward movement of transition conversion seat 5 in the axial direction; a piston cavity 16 is installed in the lower part of valve body 1; a piston type valve plate driving mechanism 15 is installed in piston cavity 16; piston type valve plate driving mechanism 15 is connected to valve plate 4 through connecting piece 23; an adapter 9 is installed at the lower end of valve body 1; at this time, adapter 9 is a gas-liquid joint 152; gas-liquid joint 152 is connected to the inside of inlet connector 2 through control valve 21; it is connected to the inside of outlet connector 3 through a thin tube; the diameter of control valve 21 is larger than that of the thin tube.

[0153] Working principle:

[0154] When control valve 21 is closed, the upper part of piston type valve plate driving mechanism is the pressure in inlet connector 2 because the inside of valve body 1 is not sealed with inlet connector 2; the lower part of piston type valve plate driving mechanism is the pressure in outlet connector 3 because the lower part of piston type valve plate driving mechanism is connected to outlet connector through a thin control pipeline 154; because of the pressure difference between inlet connector and outlet connector, piston type valve plate driving mechanism generates a downward force, thereby driving valve plate 4 to close the valve;

[0155] When valve plate 4 is open, the pressure difference between inlet connector and outlet connector is small; the small downward force generated by piston type valve plate driving mechanism 15; at this time, the tension of booster spring 13 is also at a minimum or even without tension; the force generated by piston type valve plate driving mechanism 15 can drive valve plate 4 to move downward; as valve plate 4 moves downward, the area of transition conversion seat hole 501 is covered more and more; the pressure difference between inlet connector and outlet connector increases; the downward force generated by piston type valve plate driving mechanism also increases; this positive feedback positive cycle effect; the force generated by piston type valve plate driving mechanism can completely overcome the increased tension due to the elongation of the tension spring; valve plate 4 can always move downward until valve plate 4 directly closes transition conversion seat hole 501 to close the valve;

[0156] When the valve needs to be opened from closed, the control valve 21 is opened and connected, and the pressure of the inlet pipe 2 enters the lower cavity of the piston valve plate drive mechanism through the control valve 21. Since the diameter of the control valve 21 is larger than the diameter of the thin control line 154, the lower part of the piston valve plate drive mechanism has a pressure close to the internal pressure of the inlet pipe 2, and the upper part of the piston valve plate drive mechanism also has the internal pressure of the inlet pipe 2. The upper and lower pressures of the piston valve plate drive mechanism are almost equal, and the booster elastic member 13 is in the maximum tension state. The tension of the booster elastic member 13 can pull the valve plate 4, the connecting member 23 and the piston valve plate drive mechanism upward, so that the valve plate 4 opens the hole 501 of the transition conversion seat, and the fluid passes through the pipe 2 to the valve plate pressure seat channel 102, and then passes through the conversion seat hole 501 to the outlet pipe 3, thereby opening the valve;

[0157] At this time, the booster elastic member 13 can also be installed at the lower part; a manual mechanism can also be installed on the upper end cover 7 to achieve manual and pneumatic dual control;

[0158] A sight glass 27 is installed on the lower end cover 8 to observe the working status of the valve;

[0159] A small valve mechanism is installed at the lower channel opening 167. When the valve is closed, the piston can automatically close the small valve to reduce internal leakage.

[0160] like Figure 6 As shown, it is a two-way valve with the drive system at the top.

[0161] The valve plate drive mechanism 6 is also a piston-type valve plate drive mechanism. A piston cavity 16 is provided on the upper part of the valve body 1. A connector 9 is installed on the upper end cover 7. The connector 9 is a gas-liquid connector 152. The gas-liquid connector 152 is connected to the inside of the inlet pipe 2 through a thin tube and is connected to the inside of the outlet pipe 3 through a control valve 21. A piston-type drive mechanism 15 is provided inside the piston cavity 16. The lower part of the piston drive mechanism 15 is directly or indirectly connected to the valve plate 4. A booster elastic member 13 is installed between the upper part of the piston drive mechanism 15 and the upper end cover 7. The elastic force of the booster elastic member 13 causes the piston drive mechanism 15 to move downward, driving the valve plate to close the valve.

[0162] When the control valve 21 is closed, the upper part of the piston drive mechanism 15 is the pressure in the inlet pipe 2. Since the valve plate pressure seat 10 and the interior of the valve body 1 are not sealed, the pressure inside the valve body 1 is also the pressure in the inlet pipe 2. Therefore, the upper and lower pressures of the piston drive mechanism 15 are the same. At this time, the valve plate 4 is acted upon by the elastic force of the boosting elastic member 13 and moves downward, causing the valve plate 4 to close the valve.

[0163] When the control valve 21 is opened, due to the throttling effect of the thin control line 154, the pressure above the piston drive mechanism 15 is guided into the outlet pipe 3 by the control valve 21. The pressure above the piston drive mechanism 15 is low, while the pressure below is high. The piston drive mechanism 15 generates an upward force and moves upward, driving the valve plate 4 to open the valve.

[0164] To reduce the friction between the valve plate and the transition seat, the valve plate slide rail can be installed according to Figure 7 or Figure 8 The valve plate slide rail is installed.

[0165] As shown in Figure 7 , it is a two-way valve with a spring and a transition seat welded to the valve plate 4. The transition seat 5 is welded inside the valve body 1, and the transition seat boss 18 is arranged on the inner side surface 502 of the transition seat to facilitate the machining of the sealing surface. The valve plate 4 is provided with a hole in the axial position, and the hole is internally provided with a booster elastic member 13 or a valve plate slide rail 17.

[0166] The valve plate 4 has a recess, and the valve plate sealing seat 26 is installed in the recess. The valve plate sealing seat 26 is tightly sealed with the inner side surface 502 of the transition seat 5.

[0167] As shown in Figure 8 , it is a two-way valve with a valve plate pressing seat. The valve body is square inside and outside the pipe connection position, and the valve body 1 is circular at the piston cavity 16 position. The square valve body position has a groove, which forms a protruding rib inside. The valve plate has a groove at the plate thickness position, and the protruding rib in the valve body cooperates with the groove on the valve plate 4 to form a valve plate slide rail structure.

[0168] The valve plate pressing seat elastic member 101 is arranged inside the inlet pipe 2, and the recess flat surface is arranged at the position close to the valve plate of the outlet pipe 3. The transition seat outer side surface 503 is arranged in the recess flat surface, and the elastic sealing member 20 is arranged at the cooperation position of the recess flat surface and the transition seat outer side surface 503.

[0169] As shown in Figure 9 , it is a two-way valve with a slide rail

[0170] The valve body 1 is rectangular inside the pipe connection position, and the valve plate slide rail 17 is arranged at the valve plate thickness position inside the valve body. The recess flat surface is arranged at the position of the outlet pipe 3 inside the valve body, and the transition seat outer side surface 503 is arranged in the recess flat surface.

[0171] The inner side surface of the transition seat 5 or the inner side surface 502 of the valve plate pressing seat forms an angle with the axis of the valve body 1. At least one surface of the valve plate 4 is wedge-shaped, and the wedge-shaped surface of the valve plate cooperates with the inner side surface 502 of the transition seat 5 or the valve plate pressing seat 10. The transition seat 5 can be integrated with the valve body by forging or casting process, and then the other parts of the valve body are welded.

[0172] The control valve 21 can be a small valve of any form such as two-way, three-way, four-way, etc. The control pipeline 154 can be arranged inside the valve body 1 or outside the valve body 1.

[0173] The machining precision of the parts, the covering size or proportion or action stroke and the matching of the inlet and outlet connecting pipes are within the protection scope of the utility model; in addition, in order to ensure the sealing, the sealing ring added at the place needing sealing is also within the protection scope of the patent, or the internal structure of the valve is square and the shape is circular, the outer circle and inner square structure are also within the protection scope of the patent; the chamfer or R transition between the edges of the valve is also within the protection scope of the patent.

[0174] The technical features of the above-described specific embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that the combinations are within the scope of the application.

[0175] The above-described specific embodiments only express several embodiments of the utility model, the description is more specific and detailed, but it should not be understood as the limitation of the scope of the utility model patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the utility model, a number of variations and improvements can be made, which are within the protection scope of the utility model.

[0176] It should be understood that the technical features not described in detail in the specification are all in the prior art. Although the embodiments of the application are described, the application is not limited to the above-described specific embodiments, the above-described specific embodiments are only illustrative and not restrictive, and ordinary skilled in the art can make more forms under the inspiration of the application without departing from the scope of the patent claims, which are within the protection scope of the application.

Claims

1. An automatic full-closed low flow resistance two-way valve characterized by, It is composed of a valve body (1), an inlet pipe (2), an outlet pipe (3), a valve plate (4), a transition conversion seat (5), a valve plate driving mechanism (6), an upper end cover (7), a lower end cover (8) and a connecting piece (9); The valve body (1) is cylindrical, and the left and right sides of the valve body (1) are respectively provided with passage openings, and the passage openings are provided with pipes, the left side is the inlet pipe (2), and the right side is the outlet pipe (3), and the pipes are sealingly connected with the passage openings on the valve body (1); a transition conversion seat (5) is arranged at the position corresponding to the outlet pipe (3) in the valve body (1), a conversion seat hole (501) is arranged in the middle of the transition conversion seat (5), and the conversion seat hole (501) is in communication with the outlet pipe (3); the transition conversion seat (5) and the valve body (1) are a split structure, the side of the transition conversion seat (5) facing the center of the valve body (1) is an inner side (502), the inner side (502) is a plane, and the plane of the inner side (502) is parallel to the axis of the valve body (1); the side of the transition conversion seat (5) facing away from the center of the valve body (1) is an outer side (503) facing the inner wall of the valve body (1), the outer side (503) is of any shape, and the outer side (503) is sealingly connected with the inner wall of the valve body (1) or the outlet pipe (3) inserted into the valve body (1); the valve plate (4) is arranged on the left side of the inner side (502); the valve plate driving mechanism (6) is arranged at least one of the upper part or the lower part of the valve plate (4); the valve plate driving mechanism (6) is gas-liquid driven or electrically driven; The valve plate (4) is radially (32) floating relative to the center of the valve plate driving mechanism (6); The upper and lower ends of the valve body (1) are respectively provided with an upper end cover (7) and a lower end cover (8), the upper and lower end covers are sealingly connected with the valve body (1), and the valve plate driving mechanism (6) is enclosed in the valve body (1); the connecting piece (9) is arranged at least one of the upper end, the lower end of the valve body (1) or the upper end, the lower end of the valve body (1).

2. An automatic full enclosed low flow resistance two-way valve according to claim 1, characterized in that, The valve plate driving mechanism (6) in the valve body (1) is gas-liquid driven, and the valve plate driving mechanism (6) is driven by the pressure difference between the inlet pipe (2) and the outlet pipe (3) itself; The connecting piece (9) is a gas-liquid connector (152), and the gas-liquid connector (152) is connected with the inlet pipe (2) or the outlet pipe (3) through a control valve (21) or a control pipeline (154); The outlet pipe (3) is provided with a Bernoulli pressure boosting reduced diameter portion (28), and the equivalent diameter of the Bernoulli pressure boosting reduced diameter portion (28) is smaller than the equivalent diameter of the outlet pipe (3); One end of the control pipeline (154) is inserted into the inside of the outlet pipe (3) or the inside of the Bernoulli pressure boosting reduced diameter portion (28).

3. The automatic full-bore low flow resistance two-way valve according to claim 1 or 2, characterized in that The valve plate driving mechanism (6) in the valve body (1) is gas-liquid driven, and the valve plate driving mechanism (6) is a piston type valve plate driving mechanism (15); the upper part of the valve body (1) is a valve plate cavity for accommodating the valve plate (4); the lower part of the valve body (1) is a piston cavity (16), and the piston cavity (16) is internally provided with a piston assembly (151) and a piston sealing element (153), thereby constituting the piston type valve plate driving mechanism (15); the piston type valve plate driving mechanism (15) is connected with the valve plate (4) through a connecting plate (23), the connecting plate (23) is provided with a channel, and the channel is communicated with the inlet connecting pipe (2) and the outlet connecting pipe (3); the valve plate (4) is radially (32) floating relative to the center of the piston type valve plate driving mechanism (15), and the piston type valve plate driving mechanism (15) drives the valve plate (4) to move axially through the connecting plate (23); The adapter (9) is a gas-liquid joint (152), which is connected to the inside of the inlet connecting pipe (2) through a control valve (21), connected to the inside of the outlet connecting pipe (3) or connected to the inside of the Bernoulli booster reduced diameter part (28) through a control pipeline (154), and the pass diameter of the control valve (21) is larger than the pass diameter of the control pipeline (154).

4. The automatic full-bore low flow resistance two-way valve according to claim 1 or 2, characterized in that The valve plate driving mechanism (6) in the valve body (1) is gas-liquid driven; the upper part of the valve body (1) is a small-diameter cavity (161), and the lower part is a large-diameter cavity (162), the cross-sectional area of the large-diameter cavity (162) is larger than that of the small-diameter cavity (161), the large-diameter cavity (162) is provided with a large-diameter piston driving assembly (166), and the small-diameter cavity (161) is provided with a small-diameter piston driving assembly (165); the large-diameter cavity (162) is connected with the valve plate (4) through a connecting plate (23), and the small-diameter piston driving assembly (165) is connected on the valve plate (4); the valve plate driving mechanism (6) is composed of the large-diameter and small-diameter piston driving assemblies and the connecting plate (23); the resultant force of the large-diameter and small-diameter piston driving assemblies drives the valve plate (4) to move up and down; The lower end of the valve body (1) or the lower end cover (8) is provided with a lower channel port (167), the lower channel port (167) is provided with an adapter (9), the adapter (9) is a gas-liquid joint (152) or a control pipeline (154), the lower channel port (167) is connected to the inside of the inlet connecting pipe (2) through a control valve (21) and connected to the inside of the outlet connecting pipe (3) through a control pipeline (154), and the pass diameter of the control valve (21) is larger than the pass diameter of the control pipeline (154); The upper end of the valve body (1) or the upper end cover (7) is provided with an upper channel port (163), the upper channel port (163) is provided with an adapter (9), the adapter (9) is a gas-liquid joint (152) or a control pipeline (154), and the upper channel port (163) is connected to the inside of the outlet connecting pipe (3) through the adapter (9).

5. The automatic full enclosed low flow resistance two-way valve according to claim 1 or 2, wherein The valve plate driving mechanism (6) in the valve body (1) is gas-liquid driven; the valve body (1) is divided into upper, middle and lower three parts, the upper part of the valve body (1) is a large-diameter cavity (162), the middle part of the valve body (1) is a small-diameter cavity (161), the cross-sectional area of the large-diameter cavity (162) is larger than that of the small-diameter cavity (161), a large-diameter piston driving assembly (166) is arranged in the large-diameter cavity (162), and a small-diameter piston driving assembly (165) is arranged in the small-diameter cavity (161); the large-diameter piston driving assembly (166) is connected with the small-diameter piston driving assembly (165) through a piston connecting rod (24), thereby forming a large-diameter piston driving assembly and a small-diameter piston driving assembly, and the lower part of the small-diameter piston driving assembly (165) is connected to the valve plate (4); the resultant force of the large-diameter piston driving assembly and the small-diameter piston driving assembly drives the valve plate (4) to move up and down; The valve plate driving mechanism (6) is composed of the large-diameter piston driving assembly (166), the piston connecting rod (24) and the small-diameter piston driving assembly (165), and the large-diameter piston driving assembly (166), the piston connecting rod (24) and the small-diameter piston driving assembly (165) are in a split or integrated structure, and an internal leakage passage (168) is arranged in the three parts; At least one upper passage opening (163) is formed in the upper part or the upper end cover (7) of the valve body (1), an adapter (9) is arranged on the upper passage opening (163), the adapter (9) is a gas-liquid joint (152) or a control pipeline (154), the upper passage opening (163) is connected to the outlet connecting pipe (3) through the control valve (21) on the gas-liquid joint (152) and the control pipeline (154); the equivalent diameter of the control valve (21) is larger than that of the leakage passage (168); A middle passage opening (169) is arranged at the transition position between the large-diameter cavity (162) and the small-diameter cavity (161), and the middle passage opening (169) is connected to the inside of the outlet connecting pipe (3) through the control pipeline (154).

6. The automatic full enclosed low flow resistance two-way valve according to claim 1 or 2, wherein The valve plate driving mechanism (6) in the valve body (1) is gas-liquid driven, and the valve plate driving mechanism (6) is a piston type valve plate driving mechanism (15); the position cross section of the lower valve plate (4) of the valve body (1) is in any shape, the upper part is a piston cavity (16), and the piston cavity (16) is internally provided with the piston type valve plate driving mechanism (15); the piston type valve plate driving mechanism (15) comprises a piston assembly (151), the valve plate (4) is radially floating relative to the center of the piston assembly (151), and the piston type valve plate driving mechanism (15) drives the valve plate (4) to move axially; The adapter (9) is arranged on the valve body end part or the upper end cover (7) of the upper part of the piston cavity (16), the adapter (9) is a gas-liquid joint (152), and the upper part of the piston cavity (16) is connected to the inside of the outlet connecting pipe (3) through the control valve (21) on the gas-liquid joint (152); The upper part of the piston cavity (16) is communicated with the inlet connecting pipe (2) through the control pipeline (154) on the gas-liquid joint (152) or through the leakage passage in the piston assembly (151); The equivalent diameter of the control valve (21) is larger than that of the control pipeline or the internal leakage passage.

7. The automatic fully-closed low-flow resistance two-way valve according to claim 1, wherein The valve plate driving mechanism (6) in the valve body (1) is electrically driven, and the valve plate driving mechanism (6) is an electric driving mechanism (12); The electric driving mechanism (12) is arranged on the upper portion or the lower portion of the valve plate (4), and the electric driving mechanism (12) is shielded and arranged in a closed space in the valve body (1); The electric driving mechanism (12) is composed of a screw rod mechanism (121), a nut (122) and an electric rotating unit (123); the nut (122) is arranged at the middle axial position of the valve plate (4), one end of the screw rod mechanism (121) is matched with the nut (122), and the other end is connected with the electric rotating unit (123); the nut (122) can be radially (32) floated relative to the valve plate (4), and the nut (122) is axially bound on the valve plate (4); the nut (122) is matched with the screw rod mechanism (121); the electric rotating unit (123) drives the screw rod mechanism (121) to rotate, the screw rod mechanism (121) drives the nut (122) to axially move, thereby driving the valve plate (4) to axially move; The electric rotating unit (123) contains an electric motor; the connecting piece (9) is a wiring terminal plate (124); the electric motor is used for electric energy transmission and control through the wiring terminal plate (124); A control circuit (125) is arranged in the electric driving mechanism (12).

8. The automatic full enclosed low flow resistance two-way valve according to claim 1, wherein The outlet connecting pipe (3) on the valve body (1) is inserted into the valve body (1) to enter the inner cavity of the valve body (1), and the end portion exceeds the inner wall of the valve body (1); the outer side surface (503) of the transition conversion seat (5) is directly arranged on the end portion of the outlet connecting pipe (3) extending into the valve body (1).

9. The automatic full enclosed low flow resistance two-way valve according to claim 1, wherein The upper end cover (7) in the valve body (1) or the lower end cover (8) is provided with a pressure maintaining elastic mechanism (25) at least at one of the lower portion and the upper portion.

10. The automatic fully-closed low-flow resistance two-way valve according to claim 1, characterized by The valve plate (4) in the valve body (1) is provided with a power-assisted elastic member (13) at least at one of the upper portion and the lower portion, and the power-assisted elastic member (13) drives the valve plate (4) to axially move.

11. The automatic fully-closed low-friction two-way valve according to claim 1, characterized in that A transition conversion seat is additionally arranged in the valve body (1) corresponding to the position of the inlet connecting pipe (2), so that the valve can be controlled to be opened and closed in both directions; the transition conversion seat and the valve body (1) are in a split or integrated structure.

12. The automatic fully-closed low-friction two-way valve according to claim 1, characterized in that The valve plate (4) in the valve body (1) is provided with a pit, and a valve plate sealing seat (26) is arranged in the pit; the valve plate sealing seat (26) is tightly sealed with the inner side surface (502) of the transition conversion seat (5).

13. The automatic fully-closed low-friction two-way valve according to claim 1, characterized in that The valve plate (4) in the valve body (1) is provided with a valve plate pressing seat (10) corresponding to the position of the inlet connecting pipe (2); the valve plate pressing seat (10) is provided with a channel through which fluid flows in the middle; the valve plate pressing seat (10) is provided with a pressing seat elastic member (101) around the valve plate pressing seat (10); the elastic force of the pressing seat elastic member (101) acts on the valve plate pressing seat (10), and the valve plate pressing seat (10) presses on the valve plate (4); The end portion of the upper end cover (7) and the lower end cover (8) on the valve body (1) or the inner wall of the valve body (1) is provided with a valve plate sliding rail mechanism (17); the valve plate sliding rail mechanism (17) limits the radial (32) position of the valve plate (4), and the valve plate (4) moves along the axial (31) direction of the valve plate sliding rail mechanism (17); The elastic sealing element (20) is arranged between the outer side surface (503) of the transition seat (5) and the inner wall of the valve body (1) or between the outer side surface (503) of the transition seat (5) and the corresponding connection position of the pipe. The valve body (1) is internally provided with a correcting element (22), and the transition seat (5) is peripherally provided with a binding element (11).

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