CN113217636A

CN113217636A - Stop valve

Info

Publication number: CN113217636A
Application number: CN202110355355.2A
Authority: CN
Inventors: 陈玉霞; 张治国; 李恒光
Original assignee: Individual
Current assignee: Kairuite Valve Group Co ltd
Priority date: 2021-04-01
Filing date: 2021-04-01
Publication date: 2021-08-06
Anticipated expiration: 2041-04-01
Also published as: CN113217636B

Abstract

The invention belongs to the technical field of pipeline valves, and discloses a stop valve which comprises a valve body, a valve core, a control rod and a baffle plate; the valve body is provided with an inlet, an outlet and an overflowing hole, and the overflowing hole is positioned between the inlet and the outlet so as to control the on-off of the inlet and the outlet; the valve core is provided with a sealing element which is positioned in the valve body and can move relative to the axial direction of the overflowing hole so as to control the on-off of the overflowing hole; one end of the control rod is connected with the valve core, and the other end of the control rod extends out of the valve body so as to drive the valve core to move relative to the overflowing hole; the baffle is positioned in the valve body and can reciprocate relative to the valve body; when the valve plug is driven by the control rod to move to the sealing piece to seal the overflowing hole, the baffle plate moves to a recovery state; when the control rod drives the valve core to move to the position for removing the blockage of the overflowing hole, the baffle plate moves to the position between the sealing piece and the overflowing hole and forms the shielding of the sealing piece. The stop valve can reduce the scouring of the medium to the valve core and the sealing element and prolong the service life of the stop valve.

Description

Stop valve

Technical Field

The invention belongs to the technical field of pipeline valves, and particularly relates to a stop valve.

Background

The stop valve is a valve with a valve clack moving along the central line of a valve seat, mainly plays a role in cutting off a pipeline, and is widely applied to the fields of petroleum, petrochemical industry, chemical industry, metallurgy, electric power, fire fighting, machinery and the like.

When the valve port of the stop valve in the existing structure is opened, a high-speed flowing medium can directly wash the valve clack, and long-time washing easily causes the damage of a sealing element on the valve clack, so that the use effect and the service life of the whole stop valve are influenced.

In addition, when the valve flap leaks, the operation of the whole pipeline or equipment needs to be stopped, the stop valve is dismantled for maintenance or replacement, the production efficiency is affected, the equipment is not allowed to be stopped at any place under a plurality of working conditions, and once the equipment is stopped, the serious economic loss is caused.

Disclosure of Invention

In order to solve the problems that the valve clack is directly flushed by high-speed medium in the use process of the stop valve with the existing structural form, the invention provides the stop valve with a brand-new structural form. The stop valve comprises a valve body, a valve core, a control rod and a baffle plate; the valve body is provided with an inlet, an outlet and an overflowing hole, and the overflowing hole is positioned between the inlet and the outlet so as to control the on-off of the inlet and the outlet; the valve core is provided with a sealing element and is positioned in the valve body and can move back and forth relative to the axial direction of the overflowing hole so as to control the on-off of the overflowing hole; one end of the control rod is connected with the valve core, and the other end of the control rod extends out of the valve body so as to drive the valve core to reciprocate relative to the overflowing hole; the baffle is positioned in the valve body and can reciprocate relative to the valve body;

when the control rod drives the valve core to move to the position where the sealing element blocks the flow passage hole, the baffle plate moves to a recovery state; when the control rod drives the valve core to move to the position where the valve core is not blocked by the overflowing hole, the baffle plate moves to the unfolding state, and the sealing element is shielded between the sealing element and the overflowing hole.

Preferably, the valve core is provided with an accommodating cavity, and a connecting platform is arranged inside the valve body; one end of the baffle is rotatably connected with the connecting table, and a torsion spring is arranged between the baffle and the connecting table; one end of the torsion spring is connected with the baffle, and the other end of the torsion spring is connected with the connecting table so as to drive the baffle to rotate to an unfolded state;

when the valve core moves to the process that the sealing element blocks the overflowing hole, the valve core drives the baffle to rotate against the acting force of the torsion spring so as to be recovered into the containing cavity; and when the valve core moves to the process that the sealing element removes the blockage of the overflowing hole, the baffle rotates to be unfolded under the action of the torsion spring and is positioned between the sealing element and the overflowing hole.

Further preferably, the connecting table is of a T-shaped structure and comprises a horizontal section and a vertical section; the baffle forms the rotation with the hookup location of horizontal section and vertical section in the connection platform and is connected to the rotation, and the horizontal section carries out along the rotation location of horizontal direction to the baffle of expansion state.

Preferably, a plurality of sealing elements are arranged on the valve core, and the plurality of sealing elements are distributed along the circumferential direction; the valve spool is capable of spinning to switch the seal in aligned relation with the flowbore.

Further preferably, the stop valve is also provided with a replacement sleeve; one end of the replacing sleeve is connected with the valve core, and the other end of the replacing sleeve extends to the outside of the valve body and is movably connected with the valve body so as to drive the valve core to rotate.

Further preferably, the replacement sleeve is sleeved outside the valve core, a guide groove is formed in the replacement sleeve, and a guide piece is arranged on the valve core; the guide groove is a spiral groove and is arranged on the replacement sleeve along the axial direction of the valve core, one end of the guide piece is connected with the valve core, and the other end of the guide piece extends into the guide groove along the radial direction of the valve core; the replacement sleeve is capable of reciprocating relative to the spool in an axial direction of the spool.

Further preferably, the guide member comprises a guide spring and a guide piston; one end of the guide spring is in contact connection with the valve core, and the other end of the guide spring is in contact connection with the guide piston so as to drive the guide piston to extend into the guide groove; one end of the guide piston is in sliding connection with the valve core, and the other end of the guide piston extends into the guide groove and is in relative sliding connection with the guide groove.

Further preferably, the guide groove comprises at least two turning grooves and at least two connecting grooves; the steering grooves are spiral grooves, are formed in the replacement sleeve along the axial direction of the valve core, and are parallel to each other; the connecting groove is positioned between two adjacent steering grooves and is used for connecting the two adjacent steering grooves end to end.

Preferably, the steering groove is an inclined groove and comprises a shallow groove end and a deep groove end, and the connecting groove is formed along the axial direction of the valve core and is in smooth connection with the shallow groove end of the guide groove; when the valve core rotates to the state that the sealing element is aligned with the overflowing hole, the guide piece is positioned at the connecting groove.

Preferably, one end of the control rod is movably formed with the valve core, and the other end of the control rod is provided with an external thread and extends out of the valve body and is in threaded connection with the valve body.

Compared with the stop valve with the existing structure, the stop valve has the following beneficial technical effects:

1. in the invention, the baffle which can move in a reciprocating way is arranged in the valve body, and when the valve core drives the sealing element to remove the blockage of the overflowing hole so as to communicate the inlet and the outlet, the baffle moves to a position between the valve core and the overflowing hole to shield the valve core and the sealing element thereof, so that the valve core and the sealing element are prevented from being directly washed by high-speed medium passing through the overflowing hole, the sealing element is protected, meanwhile, the washing of the high-speed medium to the valve core can be reduced, the protection of the valve core is improved, and the service life of the whole stop valve is prolonged.

2. In the invention, the guide groove and the guide piece are arranged between the change sleeve and the valve core, and the valve core can be driven to rotate by the drive of the guide piece formed by the guide groove in the process that the change sleeve axially reciprocates relative to the valve core, so that a plurality of sealing pieces on the valve core are switched in position when the stop valve is kept in an open state, the sealing pieces which are in contact sealing with the overflowing hole are changed, the continuous online working time of the stop valve is prolonged, and the use efficiency and the stability of the whole stop valve are improved.

Drawings

FIG. 1 is a schematic structural view of a shut-off valve of the present embodiment in a closed state;

FIG. 2 is a schematic structural diagram of the stop valve of the present embodiment in an open state;

FIG. 3 is a schematic structural diagram of the stop valve of the present embodiment in the valve core rotation process;

FIG. 4 is a schematic view showing the expansion of the guide groove in the shut-off valve according to this embodiment;

FIG. 5 is a perspective cross-sectional view of the replacement sleeve of the shut-off valve of the present embodiment;

FIG. 6 is a schematic cross-sectional view taken along the direction F-F in FIG. 4;

fig. 7 is a development schematic view of another guide groove in the shutoff valve of the other embodiment.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

Referring to fig. 1 to 3, the stop valve in the present embodiment includes a valve body 1, a valve body 2, a control rod 3, and a flapper 4.

The valve body 1 is provided with an inlet 11, an outlet 12, an overflow hole 13 and a connecting table 14. Wherein, an overflowing hole 13 is positioned between the inlet 11 and the outlet 12 to control the on-off relationship between the inlet 11 and the outlet 12. The connecting table 14 is fixed inside the valve body 1 and on one side of the overflowing hole 13 in the axial direction of the overflowing hole 13.

The valve core 2 is located inside the valve body 1, and can perform reciprocating linear movement relative to the overflowing hole 13 along the axial direction of the overflowing hole 13 so as to drive the sealing element 21 located on the sealing end surface to move, so that contact sealing with the overflowing hole 13 is formed, and further the communication relation between the inlet 11 and the outlet 12 is controlled. Meanwhile, the valve core 2 is also provided with an accommodating cavity 22, and the accommodating cavity 22 is arranged on the sealing end surface of the valve core 2 along the axis of the valve core 2.

The control rod 3 is arranged along the axial direction of the valve core 2, one end of the control rod is connected with the valve core 2, the other end of the control rod extends out of the valve body 1, and meanwhile, a control handle 31 is arranged at one end, located outside the valve body 1, of the control rod 3, so that the control handle 31 drives the valve core 2 to perform reciprocating linear movement relative to the valve body 1, and therefore the contact sealing of the sealing piece 21 and the overflowing hole 13 is controlled.

Baffle 4 is located the inside of valve body 1, and one end forms to rotate with being connected platform 14 and is connected, and the other end is in free state, is equipped with torsional spring 5 at the position of rotating between baffle 4 and being connected the platform 14 simultaneously. One end of the torsion spring 5 is fixedly connected with the baffle 4, and the other end is fixedly connected with the connecting table 14, so that the baffle 4 is driven to rotate relative to the connecting table 14 in the unfolding direction.

When the control handle 31 drives the valve core 2 to move to the process that the sealing piece 21 forms contact plugging on the overflowing hole 13, namely the valve core 2 moves towards the direction close to the overflowing hole 13, the valve core 2 contacts with the baffle 4 in the unfolding state and drives the baffle 4 to rotate by overcoming the acting force of the torsion spring 5, so that the baffle 4 rotates to the vertical state along the axial direction of the valve core and is recovered into the accommodating cavity 22. On the contrary, when the control handle 31 drives the valve core 2 to move reversely to the process that the sealing member 21 removes the blocking of the overflowing hole 13, that is, the valve core 2 moves in the direction away from the overflowing hole 13, the baffle 4 rotates in the unfolding direction under the action of the torsion spring 5 and is positioned between the sealing member 21 and the overflowing hole 13 in the unfolding state, so as to form the shielding of the sealing member 21.

Like this, when the case removed to open the discharge orifice and make import and export intercommunication, just can shelter from the sealing member on the case with the help of the baffle of expansion state, avoid the high-speed fluid that flows through the discharge orifice to form direct scouring to the sealing member on the case to reach the protection to the sealing member, also avoided the high-speed fluid to form direct scouring to the case simultaneously, further formed the scour protection to the case.

Preferably, in this embodiment, the connecting table is in a T-shaped structure and is composed of a horizontal section and a vertical section. Wherein, vertical section is fixed on the valve body along the axial of case, and the horizontal segment radially sets up along the case to the length dimension of horizontal segment is less than the diameter size who holds the chamber, can insert to hold the intracavity in order to guarantee this connection platform, and the baffle forms to rotate with the hookup location of horizontal segment and vertical section simultaneously and is connected.

Like this, when the baffle forms the expansion state, the horizontal segment of connecting the platform just can rotate the expansion of baffle and carry on spacingly, makes the baffle not form under the condition of contact with the case, keeps it at the turned position along the horizontal direction by the baffle to avoid the extrusion damage that probably causes the sealing member and probably to the damage of colliding with that the case led to the fact when expansion state baffle and case form the contact, reach the protection of colliding with to case and sealing member.

However, in other embodiments, according to the requirements of design and use conditions, if the flow rate of the medium flowing through the flow holes is high, the horizontal section of the connecting table can be eliminated, and the valve core is used for positioning the unfolding rotation of the baffle plate, so that an inclined drainage surface can be formed on the sealing end surface of the valve core by means of the baffle plate, the drainage guide can be performed on the high-speed medium which rushes to the valve core, the scouring of the sealing element and the valve core is reduced, and the scouring protection of the valve core and the sealing element is improved.

In addition, in this embodiment, through with the baffle with connect the platform and carry out the rotation that is connected by the torsional spring and be connected to and set up one on the case and hold the chamber, thereby can realize that the case is for crossing the orifice reciprocating motion in-process, to the automatic switch control of baffle state, reach automatic control effect, improve the use convenience of this stop valve. However, in other embodiments, the baffle may also be independently controlled according to the size and weight of the baffle, for example, for a large-size and heavy-weight baffle, the baffle may be independently controlled to rotate by a connecting rod extending to the outside of the valve body, so as to satisfy the shielding effect of the stop valve on the sealing member and the valve core against erosion when the stop valve is opened.

In addition, in this embodiment, the section of the control rod extending out of the valve body is provided with an external thread, and is in threaded connection with the control handle and the valve body, and meanwhile, the control rod and the valve core are in relative rotation connection. Therefore, the control handle is rotated in a reciprocating manner, so that the control rod can be driven to move linearly in a reciprocating manner relative to the valve body, and the valve core is driven to move linearly in a reciprocating manner relative to the overflowing hole.

According to design requirements, in other embodiments, the whole control rod can be designed into a polished rod structure and fixedly connected with the control handle, so that the valve core can be driven to reciprocate linearly by driving the control handle to linearly move relative to the valve body. At this moment, to forming shorter control lever, can also choose for use the pole to replace brake valve lever to reach the electric control to the control lever, use manpower sparingly and realize remote automatic control.

As shown in fig. 1 to 3, two sealing members 21 are provided on the valve element 2 of the present embodiment, and two blocking plates 4 rotatably connected by a torsion spring are also provided on the connecting table 14 to be respectively unfolded to a horizontal state to block the two sealing members 21, and the valve element 2 can also rotate to drive the two sealing members 21 to perform position adjustment, and the sealing members 21 aligned with the flow passing hole 13 are switched.

At the moment, when the sealing element which is aligned with the overflowing hole, namely the sealing element which is aligned with the overflowing hole along the axial direction of the valve core, is damaged after long-time work, the position of the two sealing elements can be switched by controlling the rotation of the valve core, and the other sealing element is rotated to the position aligned with the overflowing hole, so that the overflowing hole is in contact sealing by the new sealing element, the effective sealing of the overflowing hole is ensured, the online replacement of the sealing element is realized, the whole stop valve can continuously and stably work continuously, and the loss caused by disassembly and assembly is reduced. Simultaneously, just can carry out the scour protection simultaneously to two sealing members with the help of two baffles and shelter from to improve the protection to the sealing member.

In other embodiments, according to the requirements of design and use conditions, the number of the sealing elements on the valve core and the number of the baffle plates can be increased, so that switching operation among more sealing elements is achieved, the sealing reliability of the stop valve is further improved, and the continuous working performance of the whole stop valve is improved.

Preferably, a replacement sleeve 6 is also provided in the shut-off valve of this embodiment. The one end of more than 6 sleeve is the tubular structure and the cover is established in the outside of case 2, forms with case 2 and can follow the relative rotation of circumferencial direction and along axial relative movement, and the other end of more than 6 sleeve stretches out to the outside of valve body 1 to be equipped with a change handle 61 on more than 6 sleeve to it carries out along axial reciprocal linear motion to drive whole more than 6 sleeve for case 2.

As shown in fig. 3 to 6, the guide groove 62 is provided on the replacement sleeve 6, and the guide groove 62 is composed of two turning grooves 621 and two connecting grooves 622 opened on the inner surface of the replacement sleeve. The two steering grooves 621 are spiral grooves formed along the axial direction of the valve core 2 and keep a parallel relationship; the two connecting grooves 622 are respectively located between the head and the tail of the two turning grooves 621, and the two turning grooves 621 are connected end to form the continuous guide groove 62.

Further, as shown in fig. 6, in the present embodiment, the two turning grooves 621 adopt an inclined groove structure. The turning groove 621 has a shallow groove end 6211 and a deep groove end 6212 at both ends thereof, respectively, depending on the groove depth dimension, while two connecting grooves 622 are opened in the axial direction of the replacement sleeve 6, and the groove depth of the connecting groove 622 is equal to the groove depth of the deep groove end 6212 in the turning groove 621, thereby forming a smooth connection with the deep groove end 6212 and forming a step having a height difference between the connecting groove 622 and the shallow groove end 6211.

As shown in fig. 3, two guides 7 having the same structure are provided between the valve element 2 and the replacement sleeve 6, and the two guides 7 are distributed on the same diameter of the valve element 2. The guide member 7 is composed of a guide spring 71 and a guide piston 72, wherein one end of the guide spring 71 is in contact connection with the valve core 2 and the other end is in contact connection with the guide piston 72 along the diameter direction of the valve core 2 to drive the guide piston 72 to move towards the direction of the replacement sleeve 6 and extend into the guide groove 62; one end of the pilot piston 72 is slidably connected to the valve body 2, and the other end thereof extends into the pilot groove 62. Wherein the guide piston 72 projects into the connection groove 622 of the guide groove 62 when the seal member 21, the connection groove 622, and the guide member 7 are positioned on the same straight line parallel to the spool axis, i.e., when the seal member 21 is brought into an aligned positional relationship with the overflowing hole 13.

When the positions of the two sealing parts need to be switched, the whole change sleeve is driven by the change handle to linearly move relative to the valve core along the axial direction of the valve core, so that the change sleeve moves from the position in fig. 2 to the position in fig. 3. In the process, the guide piston is kept at a position extending into the guide groove under the action of the guide spring, and the guide groove moves relative to the guide groove when moving along with the change sleeve, wherein the guide piston enters the deep groove end of the steering groove and moves relatively along the steering groove due to a step formed by the height difference between the connecting groove and the shallow groove end of the steering groove, and the guide piston drives the valve core to start to rotate under the interaction of the guide piston and the steering groove. When the guide piston moves from the deep groove end of the steering groove to the shallow groove end of the steering groove and slides into the next connecting groove, the valve core completes 180-degree rotation, then along the axial direction of the valve core, the whole change sleeve is driven by the variable handle to perform reverse linear movement relative to the valve core, the change sleeve is moved back to the position in fig. 2 from the position in fig. 3, in the process, the guide piston directly performs linear movement along the connecting groove, and therefore under the condition that the valve core is kept not to rotate any more, the guide piston moves to one end, connected with the next steering groove, in the connecting groove, and the position switching operation of two sealing elements is completed.

In this embodiment, in order to improve the stability of changing the rotation of sleeve drive valve core, set up the guide way of constituteing by two turn to grooves and two spread grooves and set up two guides that are located same diameter on the case inside changing the sleeve, just so can carry out two rotation direction by two sets of guides and turn to the groove, thereby the poppet valve core is for changing sleeve pivoted stability relatively, avoid rotating the in-process and take place the switching that the slope card is pause and can't accomplish the sealing member, finally improve the switching stability to the sealing member.

Similarly, in other embodiments, the number of the steering grooves in the guide groove and the number of the guide members may also be adjusted according to the diameter size and the weight of the valve core, for example, for a large-size and heavy-weight valve core, the number of the steering grooves and the number of the corresponding guide members may be increased by increasing the inclination angle of each steering groove, so that multiple-rotation guiding by more sets of guide members and steering grooves is realized, and the stability of the valve core rotation driving is improved.

In addition, when a greater number of sealing members are provided on the valve element, the guide groove can be designed in different structures. For example, if three sealing members spaced 120 ° apart from each other are disposed on the valve core, a steering groove 621a rotating 360 ° in the circumferential direction may be disposed in the guiding groove structure shown in fig. 7, and a groove-shaped connecting groove 622a is disposed at each of the head end and the tail end of the steering groove 621a and at each of the three halves, so as to divide the steering groove 621a into three halves and guide the piston to adjust the spherical structure. Thus, when the guide piston moves from one connecting groove to the next connecting groove along the steering groove, the valve core is driven to rotate by 120 degrees, so that the position switching of the sealing element is completed, and the auxiliary positioning of the valve core at the position is formed under the positioning action of the connecting groove and the guide piston; when the guide piston continues to move to the next connecting groove along the steering groove, the valve core is driven to rotate by 120 degrees again, and therefore the position switching of the sealing element is completed once again; when the guide piston moves from the head end to the tail end of the steering groove, the sequential switching operation of the three sealing elements can be completed.

In the present embodiment, the guide groove and the guide provided between the change sleeve and the spool provide a control effect of driving the spool to rotate so as to linearly move the change sleeve. Similarly, in other embodiments, depending on the installation space of the stop valve, for example, when the height of the stop valve after installation is limited and the change handle cannot perform reciprocating linear movement in the height direction, the change sleeve and the valve element can be directly fixedly connected in the rotation direction, so as to achieve the purpose of driving and controlling the valve element to rotate by rotating the change sleeve.

As shown in fig. 1 to 3, the changing sleeve 6 of the present embodiment is further provided with a return spring 63. One end of the return spring 63 is connected to the change sleeve 6 in contact therewith, and the other end thereof is connected to the valve body 1 in contact therewith, so as to drive the change sleeve 6 to move linearly in the direction of the valve body 2. Therefore, when the sealing element is switched and the guide element moves to the connecting groove, namely, when the sealing element is in the position shown in fig. 3, the change sleeve can be directly driven by the return spring in a compressed state to move linearly relative to the valve core, so that the change sleeve and the valve core are reset along the axial position relationship, and manual reset operation is saved.

With reference to fig. 1 to 6, when the stop valve of the present embodiment is installed on a pipeline for controlling on/off of a medium, the inlet 11 is first connected to an upstream pipeline, the outlet 12 is connected to a downstream pipeline, and then the control handle 31 and the change handle 61 are operated to continuously regulate and control on/off of the medium in the pipeline by the stop valve, which specifically comprises the following operation processes:

when the stop valve needs to be opened, the control handle 31 is rotated, the control handle 31 and the valve body 1 are simultaneously in threaded connection with the control rod 3, so that the control rod 3 moves linearly relative to the valve body 1, the control rod 3 drives the valve core 2 to move towards the direction far away from the overflowing hole 13, the sealing element 21 removes the contact sealing of the overflowing hole 13 along with the movement of the valve core 2, the inlet 11 is communicated with the outlet 12 through the overflowing hole 13, and the opening operation of the stop valve is completed.

In the above process, along with the valve core 2 moving away from the overflowing hole 13, the valve core 2 gradually breaks away from the limit to the baffle 4, and when the moving height of the valve core 2 exceeds the height of the connecting table 14, the valve core 2 completely releases the limit to the baffle 4, so that the baffle 4 completely rotates to the unfolding state under the action of the torsion spring 5, and the sealing member 21 and the valve core 2 are shielded against scouring.

When the stop valve needs to be closed, the control handle 31 is rotated reversely, the control rod 3 is driven to move linearly in a reverse direction relative to the valve body 1 through the threaded connection formed between the control handle 31 and the valve body 1 and the control rod 3, so that the control rod 3 drives the valve core 2 to move towards the overflowing hole 13, the sealing piece 21 forms contact sealing with the overflowing hole 13 along with the movement of the valve core 2, the overflowing hole 13 is blocked, the communication between the inlet 11 and the outlet 12 is cut off, and the closing operation of the stop valve is completed.

In the above process, as the valve core 2 moves towards the direction approaching to the overflowing hole 13, the valve core 2 and the baffle plate 4 are in contact again, and the baffle plate 4 is driven to perform recovery rotation against the acting force of the torsion spring 5, so that the baffle plate 4 is gradually rotated to the vertical state, and finally, the baffle plate is kept in the containing cavity 22 in the recovery state under the limitation of the valve core 2.

When the positions of the two sealing members need to be switched, the stop valve is switched to the open state shown in fig. 2 according to the operation, the change handle 61 is pulled along the axial direction of the valve core 2 along the linear direction of the valve body 1, the replacement sleeve 6 is linearly moved relative to the valve core 2 against the action force of the return spring 63, the guide piston 72 enters the turning groove 621 from the connecting groove 622 under the interaction of the guide groove 62 and the guide member 7, the turning groove 621 forms an action force on the guide piston 72 along with the movement of the replacement sleeve 6, the valve core 2 is driven to start rotating, when the guide piston 72 moves to the shallow groove end 6211 from the deep groove end 6212 of the turning groove 621 and slides into the next connecting groove 622, the positions of the two sealing members 21 are switched, and the replacement sleeve 6 is in the position shown in fig. 3. Thereafter, under the restoring force of the return spring 63 and the linear guiding action between the guide 7 and the connecting groove 622, the replacement sleeve 6 is linearly moved in the reverse direction with respect to the valve body 1 to the positional relationship between the replacement sleeve 6 and the valve body 2 in fig. 2, thereby completing the position switching operation of the two sealing members 21.

Claims

1. A stop valve is characterized by comprising a valve body, a valve core, a control rod and a baffle plate; the valve body is provided with an inlet, an outlet and an overflowing hole, and the overflowing hole is positioned between the inlet and the outlet so as to control the on-off of the inlet and the outlet; the valve core is provided with a sealing element and is positioned in the valve body and can move back and forth relative to the axial direction of the overflowing hole so as to control the on-off of the overflowing hole; one end of the control rod is connected with the valve core, and the other end of the control rod extends out of the valve body so as to drive the valve core to reciprocate relative to the overflowing hole; the baffle is positioned in the valve body and can reciprocate relative to the valve body;

2. The stop valve of claim 1, wherein the spool is provided with a receiving cavity, and the valve body is internally provided with a connecting platform; one end of the baffle is rotatably connected with the connecting table, and a torsion spring is arranged between the baffle and the connecting table; one end of the torsion spring is connected with the baffle, and the other end of the torsion spring is connected with the connecting table so as to drive the baffle to rotate to an unfolded state;

3. The shut-off valve of claim 2, wherein the connecting platform is a T-shaped structure comprising a horizontal section and a vertical section; the baffle forms the rotation with the hookup location of horizontal section and vertical section in the connection platform and is connected to the horizontal section rotates the location to the baffle of expansion state.

4. The shut-off valve of claim 1, wherein a plurality of seals are provided on the spool and are circumferentially arranged; the valve spool is capable of spinning to switch the seal in aligned relation with the flowbore.

5. A shut-off valve as claimed in claim 4, characterized in that the shut-off valve is further provided with a replacement sleeve; one end of the replacing sleeve is connected with the valve core, and the other end of the replacing sleeve extends to the outside of the valve body and is movably connected with the valve body so as to drive the valve core to rotate.

6. The shut-off valve of claim 5, wherein the replacement sleeve is sleeved outside the valve spool and is provided with a guide groove, and the valve spool is provided with a guide member; the guide groove is a spiral groove and is arranged on the replacement sleeve along the axial direction of the valve core, one end of the guide piece is connected with the valve core, and the other end of the guide piece extends into the guide groove along the radial direction of the valve core; the replacement sleeve is capable of reciprocating relative to the spool in an axial direction of the spool.

7. The shut-off valve of claim 6, wherein the guide comprises a guide spring and a guide piston; one end of the guide spring is in contact connection with the valve core, and the other end of the guide spring is in contact connection with the guide piston so as to drive the guide piston to extend into the guide groove; one end of the guide piston is in sliding connection with the valve core, and the other end of the guide piston extends into the guide groove and is in relative sliding connection with the guide groove.

8. The shut-off valve of claim 6, wherein the guide slots include at least two diversion slots and at least two attachment slots; the steering grooves are spiral grooves, are formed in the replacement sleeve along the axial direction of the valve core, and are parallel to each other; the connecting groove is positioned between two adjacent steering grooves and is used for connecting the two adjacent steering grooves end to end.

9. The shutoff valve of claim 8, wherein said diverting groove is a sloped groove including a shallow groove end and a deep groove end, said connecting groove being open in the axial direction of said spool and being in smooth connection with the shallow groove end of said guide groove; when the valve core rotates to the state that the sealing element is aligned with the overflowing hole, the guide piece is positioned at the connecting groove.

10. The shut-off valve of claim 1, wherein the control rod is movably formed with the valve core at one end and is externally threaded at the other end and extends outside the valve body to be threadedly connected to the valve body.