CN209839160U - Stop valve - Google Patents

Abstract

The utility model provides a stop valve, which comprises a valve body, wherein the valve body is provided with a medium inlet, a medium outlet, a fluid channel and a mounting port; the inner wall of the fluid channel opposite to the mounting port is provided with a mounting position; the valve seat is abutted against the mounting position; the sleeve is arranged in the fluid channel corresponding to the mounting opening and is tightly pressed on the valve seat, and the valve seat is pressed by the sleeve to be in sealing and abutting joint with the mounting position; when the valve seat breaks down and needs to be replaced, only the sleeve arranged at the mounting opening of the valve body needs to be applied with outward pulling force, so that the sleeve is taken out from the valve body, the valve seat at the mounting position of the valve body is taken out from the valve body, the valve seat which breaks down and needs to be replaced is disassembled, the disassembly and the replacement are quick, the disassembly and the replacement of the valve seat can be completed in a short time, the normal use of the stop valve is ensured, and the radioactive radiation hazard is reduced.

Description

Stop valve

Technical Field

The utility model relates to a stop valve technical field, concretely relates to stop valve.

Background

The stop valve is a common device for controlling medium circulation on an industrial pipeline, belongs to a forced sealing type valve, and is usually adopted in a nuclear power station or some fields with higher radioactivity, and the stop valve is sealed by a corrugated pipe, so that the leakage caused by filler loss can be effectively prevented. In the use process, a part of valves need to be opened and closed frequently, the valves are seriously abraded, and the positions of the valves are critical, so that the valves cannot be isolated, maintained or replaced for a long time. Therefore, when the valve fails, the valve needs to be repaired in a mode of maintaining or replacing the fittings in the shortest time, and the damage to the environment and maintenance personnel caused by radioactive radiation is reduced.

Traditional stop valve includes the valve body, the valve gap, the valve clack, the valve rod, disk seat and valve rod drive arrangement, the valve body upper end is located to the valve gap, and from the upper end sealed valve body, the valve clack sets up in the valve body, be provided with the runner of opening and close by the valve clack in the valve body, valve rod one end links to each other with the valve clack, the other end is worn out the valve gap and is linked to each other with valve rod drive arrangement, valve rod drive arrangement work drives valve rod and the synchronous elevating movement of valve clack, bellows cover locates on the valve rod and one end and valve rod welded fastening, the other end and valve gap welded fastening, the disk seat sets up on the valve.

The valve seat of the above-mentioned conventional stop valve is usually fixed in the valve body, in order to reduce the use cost and prolong the service life of the stop valve, in the prior art, the valve seat is detachably arranged on the valve body, so as to be capable of being detached and replaced when the valve seat is in failure, for example, chinese patent CN206708386U discloses a stainless steel stop valve with a replaceable valve seat, which comprises a valve body, a sealing gasket, a movable valve seat, an opening and closing device and a valve rod, wherein the movable valve seat is connected in the control through hole by screw threads, and the valve seat is connected in the valve body by screw threads to form the detachable valve seat, but the screw connection mode still has some defects, that if the valve seat is tightly extruded on the inner wall of the valve body due to thermal expansion and cold contraction or large reverse pressure, the gap between the valve seat and the inner wall of the valve body is reduced, the thread corrosion or the card that causes between disk seat and the valve body is died to impurity deposit etc. leads to the disk seat to dismantle from the valve body very difficult, dismantles inconveniently and tear open and trade maintenance duration longer, can't accomplish in short time and tear open and trade, does not conform to the requirement that the maintenance of tearing open and trade of high radioactivity field stop valve accomplished in short time.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model discloses the technical problem that will solve lies in that the disk seat of current stop valve is dismantled more difficultly to lead to tearing open and trade maintenance duration longer.

Therefore, the utility model provides a stop valve, include:

the valve body is provided with a medium inlet and a medium outlet which are arranged at two ends of the valve body, a fluid channel which communicates the medium inlet with the medium outlet, and a mounting port which is communicated with the fluid channel and is positioned between the medium inlet and the medium outlet; the inner wall of the fluid channel opposite to the mounting port is provided with a mounting position;

the valve cover is hermetically arranged on the mounting opening of the valve body;

the valve seat is abutted against the mounting position;

the sleeve is arranged in the fluid channel corresponding to the mounting opening and is tightly pressed on the valve seat in a pressing mode, the sleeve is pressed and limited by the valve cover, and extrusion force is applied to the valve seat to enable the valve seat to be in sealing and abutting connection with the mounting position.

Preferably, one end of the sleeve is tightly fitted on the valve seat, and the other end of the sleeve extends to the mounting opening and is limited by the valve cover in a pressing manner, so as to apply the pressing force to the valve seat;

and the side wall of the sleeve is provided with a yielding hole for communicating the fluid channel with the medium outlet.

Preferably, in the stop valve, at least one first matching part is arranged on the circumferential outer wall surface of the valve seat, and at least one second matching part matched with the first matching parts one by one is arranged on the inner wall of the sleeve;

the sleeve is sleeved outside the valve seat, and the second matching portion is matched with the clamping of the first matching portion to apply the extrusion force to the first matching portion.

Preferably, the number of the first matching parts of the stop valve is at least two, and a first yielding area is defined between every two adjacent first matching parts;

the second matching part can be changed between mounting steering and dismounting steering, and the second matching part can be clamped and matched with the first matching part in the mounting steering; and the first matching part is withdrawn and positioned in the first yielding area when the disassembly is turned.

Preferably, in the stop valve, the first fitting portion is an annular groove, and the second fitting portion is an annular boss.

Preferably, in the stop valve, a groove wall of the annular groove extends radially outwards to form an extension part, and an end face of the end part of the sleeve, which is provided with the second matching part, abuts against the extension part.

Preferably, in the stop valve, a first groove is formed in a side surface of the extension portion, which faces away from the sleeve, and a winding sealing gasket is arranged in the first groove.

Preferably, the stop valve further comprises a valve rod which is hermetically arranged on the valve cover in a penetrating manner, one end of the valve rod extends into the fluid channel, and the other end of the valve rod is connected to the driving mechanism;

a valve flap removably mounted to an end of the valve stem extending into the fluid passageway; the valve clack is matched with the valve seat to form a sealing pair;

the corrugated pipe is arranged in the inner cavity of the valve cover and sleeved outside the valve rod, one end of the corrugated pipe is abutted and sealed on the top wall of the inner cavity of the valve cover, and the other end of the corrugated pipe is fixed on the valve rod; the outer wall surface of the corrugated pipe is connected with the inner wall of the valve cover in a sealing mode, and the inner wall surface of the corrugated pipe is connected with the valve rod in a sealing mode.

Preferably, a sleeve pipe transiting on the valve cover is further arranged between the inner wall of the valve cover and the outer wall of the corrugated pipe of the stop valve, one end of the corrugated pipe is fixed on the inner wall of the valve cover by being fixed on the sleeve pipe, and one end of the sleeve pipe, which is not fixed with the corrugated pipe, extends into the mounting opening and is tightly pressed on the end part of the sleeve pipe.

Preferably, in the stop valve, the circumferential outer wall of the end of the sleeve pressed on the sleeve is provided with an outward extending outer edge, and the outer edge is clamped between the valve cover and the end face of the valve body where the mounting opening is located.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a stop valve, which comprises a valve body, a fluid channel and a mounting port, wherein the valve body is provided with a medium inlet and a medium outlet which are arranged at two ends of the valve body; the inner wall of the fluid channel opposite to the mounting port is provided with a mounting position; the valve seat is abutted against the mounting position; and the sleeve is arranged in the fluid channel corresponding to the mounting opening and is tightly pressed on the valve seat, and the valve seat is pressed by the extrusion force of the sleeve to be in sealing and abutting connection with the mounting position.

The sleeve receives the extrusion of valve gap for the disk seat receives telescopic extrusion force butt to fix the installation position in the valve body, when the disk seat breaks down and needs to be changed, only need to apply outside pulling force to the sleeve that sets up in valve body installing port department, thereby take out the sleeve from the valve body, take out the disk seat of valve body installation position from the valve body again, the disk seat that will break down and need to change is dismantled, it is quick to dismantle the change, can accomplish the dismantlement change of disk seat in shorter time, ensure the normal use of stop valve, reduce radioactive radiation hazard.

2. The utility model provides a pair of stop valve, telescopic circumference lateral wall are equipped with the hole of stepping down that is linked together with the medium export, and when opening the valve, the medium is through medium import, installation position, the hole of stepping down, flows by the medium export at last.

3. The utility model provides a stop valve, the valve seat is provided with a first matching part, the sleeve is provided with a second matching part corresponding to the first matching part one by one, and the valve seat and the sleeve are connected by the first matching part and the second matching part in a matching way; the first matching part is extruded by the second matching part to enable the valve seat to be abutted and installed at the installation position of the valve body; first cooperation portion is the annular groove, and second cooperation portion is the annular boss, and is fixed through annular groove and annular boss cooperation joint, during the equipment, can cooperate earlier disk seat and sleeve to assemble into overall structure after the valve body is gone into again, also can once only take out the overall structure that disk seat and sleeve constitute from the valve body and change during the dismantlement in the valve body, very convenient quick.

4. The utility model provides a pair of stop valve, first cooperation portion is equipped with at least two, be formed with the region of stepping down between two first cooperation portions, the joint is connected between first cooperation portion and the second cooperation portion, the mode simple structure of joint, firm in connection can not cause when dismantling because the pulling force that overall structure that sleeve and disk seat constitute received is greater than sleeve and disk seat effort of being connected between the two and leads to both to separate to can not once only the whole take out disk seat and sleeve, the assembly and disassembly is convenient quick.

5. The utility model provides a stop valve, the second matching character is changed in mounting and dismounting steering; when the mounting steering is carried out, the first matching part and the second matching part are in clamping fit, and when the steering is dismounted, the second matching part is positioned in the abdicating area; make through rotatory second cooperation portion fixed with first cooperation portion joint, the reverse rotation makes second cooperation portion leave first cooperation portion and dismantles, rotatory installation is dismantled, and the assembly and disassembly is convenient quick.

6. The utility model provides a stop valve, still include valve rod and bellows, the bellows cover is established outside the valve rod, the valve rod seals and wears to establish on the valve bonnet and one end stretches into in the fluid passage, its tip is installed the valve clack, form the sealing pair between valve clack and the disk seat, the other end is connected with actuating mechanism, actuating mechanism drives the valve rod and goes up and down in the fluid passage of valve body, seal and open the valve, the bellows closely laminates with the valve bonnet inner wall; the lower end of the corrugated pipe is connected with the valve rod in a welding and sealing mode, and the upper end of the corrugated pipe is abutted and sealed on the inner top wall of the valve cover to form double sealing, so that a medium is prevented from flowing out from the position of the valve rod; meanwhile, the upper end of the corrugated pipe and the top wall of the valve cover are not welded and fixed, so that when the corrugated pipe breaks down and needs to be replaced, the corrugated pipe can be rapidly detached from the valve rod and the valve cover within a short time.

7. The utility model provides a pair of stop valve is equipped with a plurality of lug screw holes on the terminal surface of sleeve and valve gap crimping, makes things convenient for the installation of lug screw, because the sleeve is because operating modes such as the pressure that bears and temperature variation, because during thermal energy and pressure deformation for the clearance between valve body inner wall and the sleeve diminishes, is unfavorable for sleeve and disk seat to take out from the valve body, can install lug screw in the through-hole when dismantling, with the help of exerting the effort and taking out sleeve and disk seat from the valve body to the lug screw.

8. The utility model provides a pair of stop valve, bellows overcoat have the sleeve pipe, sheathed tube upper end and bellows welded connection, and the lower extreme crimping is on telescopic top face, when the valve gap is sealed on the installing port of valve body, applys the extrusion force to the sleeve for the disk seat is sealed to be fixed in the installation position.

9. The utility model provides a pair of stop valve, the radial outside extension of bellows sheathed tube lower extreme forms the outer fringe, and the outer fringe is by the centre gripping between the installing port of valve gap and valve body, forms sealed cooperation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic front view of the stop valve of the present invention;

FIG. 2 is a schematic view of the structure of the stop valve body of the present invention;

FIG. 3 is a schematic view of the valve seat and sleeve fitting structure of the stop valve of the present invention;

FIG. 4 is a schematic view of the valve seat of the stop valve of the present invention;

FIG. 5 is a schematic top view of the valve seat of the stop valve of the present invention;

fig. 6 is a schematic structural diagram of the stop valve of the present invention;

FIG. 7 is a schematic view of the sleeve shown in FIG. 6, viewed from the bottom up;

FIG. 8 is a schematic view of the bellows and sleeve fitting structure of the stop valve of the present invention;

fig. 9 is a schematic structural view of a bellows of the stop valve of the present invention;

fig. 10 is a schematic view of a sleeve structure of the stop valve of the present invention.

Description of reference numerals:

1-a valve body; 11-a media inlet; 12-a medium outlet; 13-a fluid channel; 14-a mounting port; 15-a first sinking platform; 16-a second sinking platform; 17-a third sinking platform; 18-a first groove;

2-valve seat; 21-a first mating portion; 22-a compression section; 23-an extension; 24-an annular groove; 25-a first yield area;

3-a sleeve; 31-a second mating portion; 32-boss; 33-a relief hole; 34-a through hole; 35-a second yield zone; 36-flat configuration;

4-valve cover; 41-bolt;

5-a corrugated pipe; 51-a bellows body; 52-upper joint; 521-a first vertical section; 522-first welding groove; 523-a second vertical section; 524-flange; 53-lower joint;

6-a sleeve; 61-outer edge; 62-a third vertical section; 63-a second welding groove; 64-inner edge; 65-a second groove;

7-a valve stem; 8-sealing filler, 9-driving mechanism;

10-a valve flap; 101-a flap cover; 102-pin axis.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

A stop valve of this embodiment, as shown in fig. 1 to 10, includes a valve body 1, a valve seat 2, a sleeve 3, a valve cover 4, a bellows 5, a sleeve 6, a valve rod 7, a valve flap 10 and a driving mechanism 9, wherein both ends of the valve body 1 are provided with a medium inlet 11 and a medium outlet 12, the valve body 1 is provided with a fluid passage 13 communicating the medium inlet 11 and the medium outlet 12, and a mounting port 14 located between the medium inlet 11 and the medium outlet 12, and an inner wall of the fluid passage 13 opposite to the mounting port 14 is provided with a mounting position; the valve seat 2 is arranged at the installation position; the sleeve 3 is arranged in the fluid channel 13 corresponding to the mounting opening 14 and is pressed on the valve seat 2 in a pressing mode, the upper end of the sleeve 3 extends to the mounting opening 14, and the valve seat 2 is in sealing and abutting contact with a mounting position under the downward extrusion force of the sleeve 3; the valve cover 4 is hermetically installed above the installation opening 14 of the valve body 1 through a bolt 41, and extrudes and limits the sleeve 3, so that the valve seat 2 is extruded and limited to abut against the installation position.

Be equipped with first cooperation portion 21 on the disk seat 2, the sleeve 3 is equipped with the second cooperation portion 31 corresponding complex with first cooperation portion 21 with the one end inner wall that disk seat 2 is relative, and the sleeve 3 cover is in the upper end outside of disk seat 2, and it is fixed with the joint cooperation of first cooperation portion 21 through second cooperation portion 31 between disk seat 2 and the sleeve 3, applys the extrusion force to first cooperation portion 21. The sleeve 3 serves to guide the valve flap 10 and to limit the valve seat 2.

As shown in fig. 2, a cavity is formed in the valve body 1, the medium inlet 11, the fluid passage 13 and the medium outlet 14 form the cavity, the medium inlet 11 is located on the left side of the illustrated valve body 1, the medium outlet 12 is located on the right side of the illustrated valve body 1, the position of the medium inlet 11 is lower than that of the medium outlet 12, an installation position is arranged between the medium inlet 11 and the medium outlet 12, an opening, namely the installation opening 14, is formed above the valve body 1, a second sinking platform 16 is arranged at the installation opening 14, the installation position is a first sinking platform 15, the valve seat 2 is installed on the first sinking platform 15, the top of the sleeve 3 is limited and fixed at the second sinking platform 16 by the extrusion of the valve cover 4, the second sinking platform 16 is in a funnel shape, and the top structure of the sleeve 3 is adaptively matched with the structure of the second sinking.

As shown in fig. 3 to 5, the valve seat 2 is of an i-shaped structure, a through hole for communicating the medium inlet 11 with the fluid channel 13 is formed in the middle of the valve seat 2, the first matching portion 21 is an annular groove formed in the middle of the valve seat 2, an extending portion 23 protruding radially outward is formed in a groove wall of the lower end of the annular groove, a limiting portion 22 protruding radially outward is also formed in the upper end of the annular groove, the limiting portion 22 is an annular boss, and the structure of the limiting portion is the same as that of the second matching portion 31; the limiting part 22 is provided for limiting the upper limit of the axial direction when the second matching part 31 is matched with the first matching part 21, so that the sleeve 3 and the valve seat 2 are prevented from being separated when the sleeve 3 and the valve seat 2 are taken out from the valve body 1, the sleeve 3 and the valve seat 2 can be taken out from the valve body 1 at the same time, and the time for replacing and maintaining is further shortened; the extending part 23 is provided for performing lower limit in the axial direction when the second engaging part 31 is engaged with the first engaging part 21, when the first engaging part 21 is engaged with the second engaging part 31, the end surface of the end part of the sleeve 3 provided with the second engaging part 31 is abutted and limited on the upper end surface of the extending part 23, and the valve seat 2 is abutted and fixed on the first sinking platform 15 through the extending part 23; the end face of the extension part 23 far away from the sleeve 3 is provided with an annular groove 24, a winding sealing gasket is arranged in the annular groove 24, and the extension part 23 is in sealing butt joint with and fixed on the first sinking platform 15 under the extrusion action of the valve cover 4.

As shown in fig. 6, the second fitting portion 31 is provided on the bottom inner wall of the sleeve 3 and is an annular boss protruding radially inward, and the second fitting portion 31 is adapted to be abutted and fixed on the extension portion 23 of the valve seat 2 by the pressing action of the valve cover 4 and applies a pressing force to the first fitting portion 21; the circumferential side wall of the sleeve 3 is provided with a yielding hole 33 communicated with the medium outlet 12, and the position of the yielding hole 33 is opposite to the medium outlet 12; the other end face opposite to the end face in pressure joint with the valve seat 2 on the sleeve 3, namely the top end face of the sleeve 3 in the figure, is provided with a boss 32 which extends outwards in the radial direction, a plurality of through holes 34 are formed in the boss 32, the through holes 34 are used for installing lifting lug screw holes, and under the working conditions of pressure, temperature change and the like borne by the sleeve 3, when the sleeve 3 deforms due to thermal expansion and pressure, the gap between the inner wall of the valve body 1 and the sleeve 3 is reduced, the sleeve 3 and the valve seat 2 cannot be taken out of the valve body 1 conveniently, lifting lug screws can be installed in the through holes 34 during disassembly, and the sleeve 3 and the valve seat 2 can be taken out of the valve.

As shown in fig. 5, two first matching parts 21 are provided, a first yielding area 25 is formed between two adjacent first matching parts 21, two second matching parts 31 are correspondingly provided, and a second yielding area 35 is formed between two adjacent second matching parts 31; the second matching part 31 is changed between mounting steering and dismounting steering, the second matching part 31 is clamped with the first matching part 21 during mounting steering, and exits from the first matching part 21 and is positioned in the first abdicating area 25 during dismounting steering; the angle of the second fitting portion 31 is slightly smaller than that of the first receding area 25, so that when the second fitting portion 31 exits the first fitting portion 21 and moves into the first receding area 25, interference with the limiting portion 22 above the first fitting portion 21 of the valve seat 2 is avoided, for example, the angle of the limiting portion 22 is an annular projection of 88 degrees, and the angle of the first receding area 25 is an annular groove of 92 degrees; similarly, the size of the second matching part 31 is slightly smaller than that of the second abdicating area 35, the sum of the angles of the limiting part 22 and the adjacent first abdicating area 25 is 180 degrees, and the sum of the angles of the second matching part 31 and the second abdicating area 35 is also 180 degrees; during installation, the sleeve 3 is placed above the valve seat 2, the second matching part 31 is located at the first yielding area 25 on the valve seat 2, the limiting part 22 is located at the second yielding area 35 in the sleeve 3, the first matching part 21 and the second matching part 31 are staggered, during installation and turning, the second matching part 31 rotates to be matched with the first matching part 21, the second matching part 31 is just right below the limiting part 22, the first yielding area 25 of the valve seat 2 is right opposite to the second yielding area 35 of the sleeve 3, and the limiting part 22 is located right above the second matching part 31 to limit the second matching part 31; when the sleeve 3 is lifted upwards, the sleeve 3 can be detached from the valve seat 2 by rotating the second matching portion 31 away from the first matching portion 21 to the position of the first abdicating area 25 of the valve seat 2 by the same angle in the opposite direction, and the first matching portion 21 is just in the second abdicating area 35 of the sleeve 3. Of course, only one first engagement portion 21 may be provided, and only one second engagement portion 31 may be provided correspondingly; the first fitting portions 21 may also be provided in three, four, etc., and the second fitting portions 31 may be correspondingly provided in three, four, etc.

In order to facilitate the positioning of the sleeve 3 when the sleeve 3 and the valve seat 2 are assembled, as shown in fig. 7, the outer periphery of the sleeve 3 is provided with a flat structure, and the flat structure is actually a horizontal plane rather than an arc surface, so that the sleeve 3 is prevented from rotating in the inner cavity of the valve body 1 due to the flushing of a fluid medium in the valve body, and the abdicating hole 33 of the sleeve 3 is not opposite to the medium outlet 12.

As shown in fig. 1, the valve rod is of a three-section structure, and comprises a small thread end section connected with the driving mechanism 9, a middle section sealed in the inner cavity of the valve cover 4, and a large end section extending into the inner cavity of the valve body 1, wherein a valve clack cover 101 is sleeved on the large end section, a valve clack 10 is connected with the lower end of the periphery of the valve clack cover 101 through threads, and a pin shaft 102 is further arranged between the valve clack cover 101 and the valve rod 7 to prevent the valve clack 10 and the valve rod 7 from rotating relatively; the middle section of valve rod 7 is sealed through sealing filler 8 and is worn to establish on valve gap 4, and the cooperation forms sealed vice between valve clack 10 and the disk seat 2, and the upper end of valve rod 7 is connected with actuating mechanism 9, and valve rod 7 receives the drive of actuating mechanism 9 to go up and down in valve body 1 to drive valve clack 10 and close or open the valve. The driving mechanism 9 can be a driving hand wheel, and the driving hand wheel is in threaded connection with the upper end of the valve rod 7.

As shown in fig. 2, 8 to 10, the bellows 5 is sleeved on the middle section of the valve rod 7 and includes an upper joint 52, a bellows body 51 and a lower joint 53, the upper joint 52 of the bellows 5 is abutted and fixed on the top wall of the inner cavity of the valve cap 5 when being fixed in the inner cavity of the valve cap 4 in a sealing manner, the lower joint 53 of the bellows 5 is welded and fixed with the valve rod 7, and the inner wall surface of the bellows 5 is connected with the valve rod 7 in a sealing manner; a double seal is formed with the sealing packing 8 to prevent the fluid medium from leaking out from the position of the valve rod 7; the outer end of the corrugated pipe 5 is sleeved with a sleeve 6, the inner wall of the upper end of the sleeve 6 is welded and fixed with an upper joint 52 of the corrugated pipe 5, the sleeve 6 is tightly attached to the inner wall of the valve cover 4, and the lower end of the sleeve 6 is fixedly connected to the upper surface of the sleeve 3 in a compression joint mode and applies extrusion force to the valve seat 2; the outer edge 61 extending outwards is arranged on the circumferential outer wall of one end, in a crimping mode, of the sleeve 6, the outer edge 61 is located above the second sinking platform 16, the mounting opening 14 is provided with a third sinking platform 17, the outer edge 61 is clamped between the valve cover 4 and the end face where the mounting opening 14 of the valve body 1 is located and is sealed on the third sinking platform 17 in a crimping mode, a second groove 65 is formed in the end face, facing the valve cover 4, of the outer edge 61, the outer edge 61 is in sealing connection with the valve cover 4 in a sealing mode through a wound sealing gasket, the upper surface of the third sinking platform 17 is also provided with a first groove 18, the outer edge 61 of the sleeve 6 is in a pressing mode through the wound sealing gasket and is sealed on the third sinking platform 17 under the extrusion effect of the valve cover, the top end face of the sleeve 3 is limited on the second sinking platform 17, the extrusion force is applied to the valve seat 2 below the sleeve 3, and the valve seat.

As shown in fig. 9 and 10, the upper joint 52 sequentially includes, from top to bottom, a first vertical section 521, a first welding bevel 522, a second vertical section 523 and a radially outwardly extending flange 524, the inner wall of the top end of the sleeve 6 is provided with, from top to bottom, a second welding bevel 62, a third vertical section 63 and a radially inwardly extending inner edge 64, the first vertical section 521 is located at the outer end of the sleeve 6 and is abutted and fixed on the top wall of the inner cavity of the valve cap 4 when the valve rod 7 is installed in the valve cap 4, the first welding bevel 522 is matched with the second welding bevel 62 to weld and fix the sleeve 6 and the bellows 5, the third vertical section 63 is matched with the second vertical section 523, and the flange 524 is matched with the inner edge 64. Bellows 5 and sleeve pipe 6 and valve gap 4 do not have welded fastening between, when bellows 5 and sleeve pipe 6 break down and need to be changed, only need to dismantle valve gap 4, take off valve gap 4, valve rod 7 and bellows 5 and sleeve pipe 6 together from valve body 1 in, cut off bellows 5 and sleeve pipe 6 from valve rod 7 again and can accomplish and dismantle the change, but bellows 5 and sleeve pipe 6 quick dismantlement change ensures the leakproofness when the stop valve uses, the life of extension stop valve.

As a first alternative embodiment of this embodiment, the matching manner between the sleeve 3 and the valve seat 2 may also be a threaded connection, for example, the inner wall of the sleeve 3 is provided with an internal thread, the outer wall of the valve seat 2 is provided with an external thread, the sleeve 3 is sleeved at the outer end above the valve seat 2, and the sleeve 3 is screwed with the valve seat 2 through the internal and external threads; the upper end of sleeve 3 receives the extrusion force of valve gap 4, and the lower extreme of sleeve 3 extrudees disk seat 2 for disk seat 2 is by spacing butt in the installation position.

As a modified embodiment, the matching mode between the sleeve 3 and the valve seat 2 can also be threaded connection, for example, the outer wall of the sleeve 3 is provided with external threads, the inner wall of the valve seat 2 is provided with internal threads, the valve seat 2 is sleeved at the outer end below the sleeve 3, and the sleeve 3 and the valve seat 2 are in threaded connection through the internal and external threads; the upper end of sleeve 3 receives the extrusion force of valve gap 4, and the lower extreme of sleeve 3 extrudees disk seat 2 for disk seat 2 is by spacing butt in the installation position.

As a second alternative embodiment of this embodiment, the matching manner between the sleeve 3 and the valve seat 2 may also be welding, and the bottom end of the sleeve 3 and the top end of the valve seat 2 are welded; the upper end of sleeve 3 receives the extrusion force of valve gap 4, and the lower extreme of sleeve 3 extrudees disk seat 2 for disk seat 2 is by spacing butt in the installation position.

As a third alternative embodiment of this embodiment, the matching manner between the sleeve 3 and the valve seat 2 may also be pin connection, pin holes are both formed on the sleeve 3 and the valve seat 2, and the sleeve 3 is sleeved on the periphery of the upper end of the valve seat 2 and fixedly connected by a pin; the upper end of sleeve 3 receives the extrusion force of valve gap 4, and the lower extreme of sleeve 3 extrudees disk seat 2 for disk seat 2 is by spacing butt in the installation position.

As a fourth alternative embodiment of this embodiment, the first matching portion 21 is an annular groove, the second matching portion 31 is an annular boss and has elasticity, the lower end groove wall of the valve seat is provided with an extension portion protruding radially outward, the bottom end surface of the sleeve abuts against and is limited on the upper surface of the extension portion when the first matching portion and the second matching portion are matched, and the top end groove wall of the valve seat may not be provided with the extension portion; during the equipment, second cooperation portion 31 receives the extrusion force of valve gap 4 to take place elasticity deformation after the grafting fix in first cooperation portion 21, only need during the dismantlement to valve seat 2 and sleeve 3 exert opposite effort make second cooperation portion 31 take place elasticity deformation to break away from in first cooperation portion 21 can.

As a fifth alternative embodiment of this embodiment, the matching manner between the sleeve and the valve seat may be a separate structure, the valve seat is installed at the installation position, the sleeve is installed in the fluid channel between the installation opening and the installation position, and after the sleeve is pressed and limited by the valve cover, the bottom end face of the sleeve is pressed and abutted to the valve seat and sealed; when the valve seat is disassembled, the valve cover is only required to be opened, and the sleeve is taken out firstly and then the valve seat is taken out.

As a sixth alternative embodiment of the present embodiment, the valve flap 10 and the valve flap cover 101 may be fixedly connected by spot welding.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (10)

1. A shut-off valve, comprising:

a valve body (1) having a medium inlet (11) and a medium outlet (12) provided at both ends thereof, a fluid passage (13) communicating the medium inlet (11) and the medium outlet (12), and a mounting port (14) communicating with the fluid passage (13) and located between the medium inlet (11) and the medium outlet (12); the inner wall of the fluid channel (13) opposite to the mounting port (14) is provided with a mounting position;

the valve cover (4) is hermetically arranged on the mounting opening (14) of the valve body (1);

a valve seat (2) abutting against the mounting position;

the sleeve (3) is arranged in the fluid channel (13) corresponding to the mounting opening (14) and is tightly pressed on the valve seat (2), the sleeve (3) is extruded and limited by the valve cover (4) so as to apply extrusion force to the valve seat (2) to enable the valve seat (2) to be in sealing and abutting connection on the mounting position.

2. A stop valve according to claim 1, characterized in that the sleeve (3) has one end closely fitted on the valve seat (2) and the other end extending to the mounting opening (14) to be pressed and limited by the valve cover (4) to apply the pressing force to the valve seat (2);

and the side wall of the sleeve (3) is provided with a yielding hole (33) for communicating the fluid channel (13) with the medium outlet (12).

3. A stop valve according to claim 1 or 2, wherein the circumferential outer wall surface of the valve seat (2) is provided with at least one first fitting portion (21), and the inner wall of the sleeve (3) is provided with at least one second fitting portion (31) which is fitted with the first fitting portion (21) one by one;

the sleeve (3) is sleeved outside the valve seat (2), and is matched with the clamping of the first matching part (21) through the second matching part (31) so as to apply the extrusion force to the first matching part (21).

4. A stop valve according to claim 3, wherein the number of the first fitting portions (21) is at least two, and a first abdicating area (25) is defined between two adjacent first fitting portions (21);

the second matching part (31) can be changed between mounting steering and dismounting steering, and the second matching part (31) can be in clamping fit with the first matching part (21) in the mounting steering; and exits the first mating portion (21) and is in the first abdicating area (25) upon the disassembly turn.

5. A shut-off valve according to claim 4, characterised in that the first fitting part (21) is an annular groove and the second fitting part (31) is an annular projection.

6. A stop valve according to claim 5, wherein a wall of the annular groove extends radially outwards to form an extension (23), and the end face of the end of the sleeve (3) provided with the second fitting portion (31) abuts against the extension (23).

7. A stop valve according to claim 6, characterized in that the surface of the extension (23) on the side facing away from the sleeve (3) is provided with a first groove (24), and a wound gasket is provided in the first groove (24).

8. The stop valve according to claim 2, characterized by further comprising a valve rod (7) which is hermetically arranged on the valve cover (4) in a penetrating way, and one end of the valve rod (7) extends into the fluid channel (13) and the other end is connected with the driving mechanism (9);

a valve flap (10) removably mounted on the end of the valve stem (7) projecting into the fluid passage (13); the valve clack (10) is matched with the valve seat (2) to form a sealing pair;

the corrugated pipe (5) is arranged in the inner cavity of the valve cover (4) and sleeved outside the valve rod (7), one end of the corrugated pipe is abutted and sealed on the top wall of the inner cavity of the valve cover (4), and the other end of the corrugated pipe is fixed on the valve rod (7); the outer wall surface of the corrugated pipe (5) is connected with the inner wall of the valve cover (4) in a sealing mode, and the inner wall surface of the corrugated pipe (5) is connected with the valve rod (7) in a sealing mode.

9. A stop valve as claimed in claim 8, characterized in that a sleeve (6) is arranged between the inner wall of the valve cover (4) and the outer wall of the bellows (5), the sleeve (6) is arranged on the valve cover (4) in a transition manner, one end of the bellows (5) is fixed on the inner wall of the valve cover (4) by being fixed on the sleeve (6), and the end of the sleeve (6) which is not fixed with the bellows (5) extends into the mounting opening (14) and is tightly pressed on the end of the sleeve (3).

10. A stop valve according to claim 9, wherein the peripheral outer wall of the end of the sleeve (6) which is crimped onto the sleeve (3) is provided with an outwardly extending outer rim (61), the outer rim (61) being clamped between the bonnet (4) and the end face of the valve body (1) where the mounting opening (14) is located.