CN112833203A

CN112833203A - Novel gate valve and assembling method thereof

Info

Publication number: CN112833203A
Application number: CN202110153873.6A
Authority: CN
Inventors: 孙世林; 钟应武; 査从瑞
Original assignee: Anhui Redstar Valve Co Ltd
Current assignee: Anhui Redstar Valve Co Ltd
Priority date: 2021-02-04
Filing date: 2021-02-04
Publication date: 2021-05-25
Anticipated expiration: 2041-02-04
Also published as: CN112833203B

Abstract

The invention relates to the technical field of valves, in particular to a novel gate valve and an assembling method of the gate valve. A novel gate valve comprises a valve body, a valve cover, a sheath and a valve core assembly, wherein the sheath is arranged on the valve cover, the valve cover is arranged on the valve body, a valve cavity is formed in the valve body, a first port and a second port are formed in the valve body, the valve core assembly penetrates through the sheath and the valve cover, extends into the valve cavity and can move along the axial direction of the valve core assembly so as to control the communication or the partition of the first port and the second port; the novel gate valve further comprises a positioning ring, the valve core assembly comprises a valve rod, a limiting structure is arranged on the valve rod, the positioning ring hoops the valve rod, one end of the positioning ring is abutted to the valve cover, the limiting structure is arranged in the valve cavity and can be matched with the inner wall of the valve cover, and the valve rod is axially limited. The invention has the advantages that: reliability of the limit of the valve rod can be enhanced.

Description

Novel gate valve and assembling method thereof

Technical Field

The invention relates to the technical field of valves, in particular to a novel gate valve and an assembling method of the gate valve.

Background

The gate valve is installed on a water pipeline system and plays a role in opening and closing, the gate valve comprises a valve core assembly, the valve core assembly comprises a valve rod, and opening and closing of the gate valve are achieved through rotating the valve rod.

In the patent with application number 2013107451074, a locking nut is sleeved outside a valve rod, a positioning bolt is screwed into the locking nut from the outside, the positioning bolt abuts against the valve rod to limit the valve rod, the positioning bolt is not connected with the valve rod, the abutting force is poor, the positioning bolt is easy to loosen in the locking nut, the reliability of limiting the valve rod is affected, and the positioning bolt is easy to fall off from the locking nut and fall off.

Disclosure of Invention

Based on this, the invention provides a novel gate valve aiming at the technical problems, and the technical scheme is as follows:

a novel gate valve comprises a valve body, a valve cover, a sheath and a valve core assembly, wherein the sheath is arranged on the valve cover, openings at two ends of the valve cover are arranged and covered on the valve body, a valve cavity is formed in the valve body, a first port and a second port are formed in the valve body, the valve core assembly penetrates through the sheath and the valve cover, extends into the valve cavity and can move along the axial direction of the valve core assembly so as to control the communication or the partition of the first port and the second port; the novel gate valve further comprises a positioning ring, the sheath wraps the outer side of the positioning ring, the valve core assembly comprises a valve rod, a limiting structure is arranged on the valve rod, the positioning ring hoops the valve rod, one end of the positioning ring can abut against the valve cover and can cover the valve cover, the valve cover is close to the opening of the positioning ring, the limiting structure is arranged in the valve cavity and can be matched with the inner wall of the valve cover, and the valve rod is axially limited.

Due to the arrangement, the positioning ring and the limiting structure can axially limit the valve rod, the positioning ring hoops the valve rod, the problem that looseness is easy to occur when a bolt and a nut are matched is solved, the positioning ring hoops the valve rod, and the valve rod can drive the positioning ring to rotate together, so that the limiting effect of the positioning ring on the valve rod is enhanced; and, the locating ring and limit structure all exert on the valve gap to the spacing effort of valve rod, and the valve gap is great, and with valve body fixed connection, can strengthen the reliability of locating ring and limit structure to the spacing of valve rod.

In one embodiment, the positioning ring is in a circular truncated cone shape, the positioning ring has a first end surface and a second end surface, the diameter of the first end surface is smaller than that of the second end surface, the second end surface is arranged close to the valve cover, and the outer diameter of the second end surface is larger than the inner diameter of an opening of one end of the valve cover close to the positioning ring.

So set up, can prevent that the inside device of valve gap from deviating from.

In one embodiment, the valve rod is provided with a positioning groove, and the positioning ring is clamped in the positioning groove.

So set up, can make the holding ring joint in the valve rod more closely.

In one embodiment, the positioning ring has a slot formed in a side surface thereof, the positioning ring has a first side and a second side opposite to each other, and the slot extends from the first side to the second side.

So set up, when the installation, the holding ring can break off with the fingers and thumb to adorn smoothly to the valve rod on.

In one embodiment, a dustproof ring is arranged in the sheath, the inner wall of the dustproof ring is abutted to the valve rod, the positioning ring can move along the axial direction of the valve rod in the sheath along with the valve rod, one end, far away from the positioning ring, of the dustproof ring is abutted to the inner wall of the sheath, and the outer side wall of the positioning ring is arranged at an interval with the inner wall of the sheath; the sheath with valve gap threaded connection when new-type gate valve is in the first state, the holding ring is with the terminal surface butt of dust ring, the dust ring can drive the sheath lock in the valve gap when new-type gate valve is in the second state, the holding ring with the butt is removed to the terminal surface of dust ring.

So set up, the dust ring not only can play the backstop effect, can also keep the cleanness of sealed letter.

In one embodiment, the dust ring comprises a first portion and a second portion which are connected with each other, a first positioning step is arranged between the first portion and the second portion, the sheath abuts against the first positioning step, the first portion is obliquely arranged relative to the axis of the dust ring, and the inner wall of the first portion, which is far away from the second portion, abuts against the outer wall of the valve rod.

So set up, make things convenient for the installation of dust ring, and make the inner wall of first section paste the outer wall in the valve rod more closely.

In one embodiment, the valve core assembly further includes a plurality of envelopes, the envelopes are sleeved outside the valve rod at intervals, a fifth sealing element is arranged between the adjacent envelopes, and an end surface of the envelope close to the positioning ring protrudes relative to an end surface of the valve cover close to the positioning ring and abuts against the positioning ring.

So set up, can strengthen the leakproofness of valve rod and valve gap.

In one of them embodiment, new-type gate valve still includes sealed letter, sealed letter is located in the valve gap, be equipped with first spacing portion on the valve gap, be equipped with first cooperation portion on the sealed letter, first spacing portion can with first cooperation portion cooperation, just sealed letter is close to the terminal surface of the one end of holding ring is relative the valve gap is close to the terminal surface indentation setting of holding ring.

By the arrangement, the sealing box can be protected from being worn due to extrusion of the positioning ring.

In one embodiment, a first sealing groove is formed in the inner side wall of the sealing box, a first sealing element is arranged in the first sealing groove and abutted against the outer wall of the valve rod, a second sealing groove is formed in the outer side wall of the sealing box, a second sealing element is arranged in the second sealing groove and abutted against the inner wall of the valve cover, a third sealing groove is formed in the valve rod, a third sealing element is arranged in the third sealing groove and positioned between the sealing box and the valve cavity, and the third sealing element is abutted against the inner wall of the valve cover.

So set up, can further strengthen the sealed cooperation between valve rod and the valve gap.

The invention also provides the following technical scheme:

the assembling method of the gate valve is used for assembling a novel gate valve, the novel gate valve comprises a valve body, a valve cover, a sheath, a valve core assembly, a positioning ring, a sealing box and a dust ring, the valve core assembly comprises a valve rod, a limiting structure is arranged on the valve rod, a valve cavity is formed in the valve body, and the method comprises the following steps of;

loading the valve core assembly into the valve cavity;

sleeving the valve cover outside the valve rod, installing the valve cover on the valve body, and enabling the inner wall of the valve cover to abut against the limiting structure;

sleeving the sealing box outside the valve rod and installing the sealing box in the valve cover;

sleeving the positioning ring on the valve rod;

the dustproof ring is arranged on the positioning ring and sleeved outside the valve rod;

and installing the protective sleeve on the valve cover and sleeving the dustproof ring and the positioning ring.

So set up for can set up the holding ring that prevents valve rod axial displacement on the valve rod, and can change holding ring, sealed letter, dust ring isotructure on line.

Compared with the prior art, the novel gate valve provided by the invention has the advantages that the positioning ring and the limiting structure are arranged outside the valve rod, the positioning ring hoops the valve rod, one end of the positioning ring can be abutted against the valve cover and can seal the opening of the valve cover, the limiting structure can be matched with the valve cover to limit the valve rod, the positioning ring is strong in limiting capacity and not easy to fall off, and the limiting acting force of the positioning ring and the limiting structure on the valve rod is applied to the valve cover, so that the reliability of limiting can be enhanced.

Drawings

FIG. 1 is a structural cross-sectional view of a novel gate valve according to a first embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a sectional view of the novel gate valve according to the second embodiment of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 at B;

FIG. 5 is a schematic structural diagram of the novel gate valve;

FIG. 6 is a top view of the retaining ring;

FIG. 7 is a perspective view of the retaining ring;

FIG. 8 is a schematic structural view of a dust ring;

FIG. 9 is a cross-sectional view taken at B-B of FIG. 8;

FIG. 10 is a schematic structural view of a valve cover;

FIG. 11 is a schematic view of the valve flap and nut seat;

fig. 12 is a schematic structural view of the valve body.

The symbols in the drawings represent the following meanings:

100. a new gate valve; 10. a valve body; 11. a valve cavity; 12. a first port; 13. a second port; 14. a second limiting part; 141. a guide post; 15. a fourth seal groove; 16. a fourth seal member; 20. a valve cover; 21. a first stage; 211. a second positioning step; 22. a second stage; 23. a first limiting part; 231. a limiting groove; 30. a sheath; 40. a valve core assembly; 41. a valve stem; 401. a limiting structure; 411. a limiting bulge; 412. a gasket; 413. a third seal groove; 414. a third seal member; 415. positioning a groove; 42. a valve flap; 421. a second mating portion; 4211. a groove; 43. a nut seat; 50. sealing the box; 51. a first mating portion; 511. a boss; 52. a first seal groove; 53. a first seal member; 54. a second seal groove; 55. a second seal member; 60. a positioning ring; 601. a first end face; 602. a second end face; 61. a first side; 62. a second side; 63. strip sewing; 70. a dust ring; 71. a first part; 72. a second section; 73. a first positioning step; 80. a cover; 81. and a fifth seal.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 12, the present invention provides a novel gate valve 100 (hereinafter referred to as gate valve 100) installed in a water pipeline for opening and closing the pipeline.

Specifically, referring to fig. 1, the gate valve 100 includes a valve body 10, a valve cover 20, a sheath 30 and a valve core assembly 40, the valve body 10 has a valve cavity 11 therein, the valve core assembly 40 is partially located in the valve cavity 11, one end of the valve core assembly 40 penetrates through the sheath 30 and the valve cover 20 and extends out of the valve body 10, one end of the valve core assembly 40 extending out of the valve body 10 is connected with a hand wheel (not shown), and an operator can control the valve core assembly 40 by rotating the hand wheel. The valve cover 20 is a hollow structure with two open ends.

The valve body 10 is provided with a first port 12 and a second port 13, the first port 12 and the second port 13 are respectively communicated with the valve cavity 11, and the first port 12 and the second port 13 can be communicated or separated by rotating the valve core assembly 40. The first port 12 may be an inlet and the second port 13 may be an outlet, or the first port 12 may be an outlet and the second port 13 may be an inlet.

Referring to fig. 10, the valve cover 20 includes a first section 21 and a second section 22 connected to each other, an outer diameter of the first section 21 is smaller than an outer diameter of the second section 22, so that a second positioning step 211 is formed between the first section 21 and the second section 22, and the sheath 30 is in threaded connection with the first section 21 and abuts against the second positioning step 211, so as to enhance the firmness of the connection between the valve cover 20 and the sheath 30.

The fourth seal groove 15 has been seted up on the lateral wall of first section 21, is equipped with fourth sealing member 16 in the fourth seal groove 15, and fourth sealing member 16 supports with the inner wall of sheath 30 to prevent that the screw thread department of valve cap 20 from meeting water and rustting, and unable normal rotation.

The valve core assembly 40 includes a valve rod 41 and a valve flap 42, the valve flap 42 is connected to the valve rod 41, and the valve rod 41 can drive the valve flap 42 to move along the axial direction of the valve core assembly 40 to block or communicate the first port 12 and the second port 13. The valve rod 41 is provided with a limiting structure 401, and the limiting structure 401 is located in the valve cavity 11 and used for axial limiting of the valve rod 41. The stopper structure 401 is provided with a gasket 412, and the gasket 412 abuts against the inner wall of the bonnet 20. The washer 412 can reduce the friction between the stopper structure 401 and the inner wall of the bonnet 20, thereby reducing the torque of the new gate valve 100. The limiting action force of the limiting structure 401 on the valve rod 41 is generated on the valve cover 20, the valve cover 20 is large and is fixedly connected with the valve body 10, and the reliability of limiting can be enhanced.

Limiting structure 401 is for being annular limiting protrusion 411, perhaps, limiting structure 401 is a plurality of limiting protrusion 411, a plurality of limiting protrusion 411 along valve rod 41's circumference evenly distributed, and limiting protrusion 411 passes through the inner wall butt of packing ring 412 with valve gap 20 to go on upper limit to valve rod 41, prevent that valve rod 41 from deviating from in the valve gap 20. Of course, the stopper structure 401 is not limited to the above two. It should be noted that the upper limit refers to preventing the valve rod 41 from moving away from the valve flap 42, and the limit structure 401 can perform the upper limit and the lower limit on the valve rod 41 at the same time.

Referring to fig. 2, a third sealing groove 413 is formed on an outer side wall of the valve rod 41, a third sealing element 414 is disposed in the third sealing groove 413, and the third sealing element 414 abuts against an inner wall of the bonnet 20. When the sealing box 50 described below is replaced, the third sealing element 411 can still perform a sealing function, and online maintenance is realized.

Referring to fig. 11, the valve core assembly 40 further includes a nut seat 43, the nut seat 43 is connected to the valve flap 42, the valve rod 41 is connected to the nut seat 43 by screw threads, and when the valve rod 41 rotates, the valve flap 42 is limited by the inner wall of the valve body 10 in the circumferential direction, so that the valve flap 42 can only reciprocate along with the nut seat 43.

Referring to fig. 12, the inner wall of the valve body 10 is provided with a second limiting portion 14, the valve flap 42 is provided with a second engaging portion 421, and the second limiting portion 14 is engaged with the second engaging portion 421 to circumferentially limit the valve flap 42.

The valve body 10 is provided with a guide post 141 on an inner wall thereof to form a second position-limiting portion 14, the valve flap 42 is provided with a groove 4211 to form a second matching portion 421, and the guide post 141 is snapped into the groove 4211, so that the valve flap 42 moves along the guide post 141. Of course, in other embodiments, the second position-limiting portion 14 may also be the groove 4211, and the second matching portion 421 may also be the guiding column 141.

Example one

Referring to fig. 1 and fig. 2, the novel gate valve 100 further includes a sealing box 50, wherein the sealing box 50 is disposed in the valve cap 20 and sleeved outside the valve rod 41, for sealing connection between the valve rod 41 and the valve cap 20. The sealing box 50 is made of rigid material such as stainless steel.

The sealing box 50 is provided with a first matching part 51, the valve cover 20 is provided with a first limiting part 23, and the first matching part 51 and the first limiting part 23 are matched to position and install the sealing box 50 into the valve cover 20.

In this embodiment, the first engaging portion 51 is a boss 511, the boss 511 is disposed at an end of the sealing box 50 away from the valve flap 42, the first limiting portion 23 is a limiting groove 231, the limiting groove 231 is disposed on an end surface of the first section 21 away from the second section 22, and the boss 511 is clamped in the limiting groove 231. Of course, in other embodiments, the first engaging portion 51 may be the limiting groove 231, and the first limiting portion 23 may be the boss 511.

The end surface of the sealing box 50 away from the valve flap 42 is set back from the end surface of the notch of the stopper groove 231 to protect the sealing box 50 from abrasion due to the pressing of the below-described positioning ring 60.

First seal groove 52 has been seted up to the inside wall of sealing box 50, is equipped with first sealing member 53 in the first seal groove 52, and first sealing member 53 and the lateral wall butt of valve rod 41 have been seted up to the lateral wall of sealing box 50, is equipped with second sealing member 55 in the second seal groove 54, and second sealing member 55 and the inner wall butt of valve gap 20, first sealing member 53, the cooperation of second sealing member 55 and third sealing member 414 for valve rod 41 and valve gap 20 are sealed to be cooperated.

In this embodiment, the number of the first sealing members 52 is two, the number of the second sealing members 55 is one, the sealing box 50 forms three seals, the second sealing members 55 form a static seal, and the first sealing members 52 rotate relative to the valve rod 41 to form a dynamic seal.

Referring to fig. 6 and 7, the novel gate valve 100 further includes a positioning ring 60, the positioning ring 60 surrounds the valve stem 41, the positioning ring 60 is disposed in the sheath 30, one end of the positioning ring 60 can abut against the valve cap 20 to axially limit the valve stem 41, specifically, can lower limit the valve stem 41, and the positioning ring 60 can abut against the valve cap 20 and cover one end of the valve cap 20 close to the positioning ring 60, so as to prevent components in the valve cap 20 from separating out of the valve cap 20.

The existing gate valve can be understood that a locking nut is sleeved outside a valve rod, a positioning bolt is screwed from the outside, the positioning bolt abuts against the valve rod, the valve rod is limited downwards, the positioning bolt is not connected with the valve rod and only depends on abutting force for limiting, the abutting force of the positioning bolt on the valve rod is insufficient, the valve rod is difficult to limit, the positioning bolt is easy to loosen and fall off from the locking nut, the size of the positioning bolt is small, and the positioning bolt is difficult to find after falling off; the invention performs the limiting through the positioning ring 60, the positioning ring 60 hoops the valve rod 41 and rotates along with the valve rod 41, the positioning ring 60 cannot fall off due to the action of the sheath 30, the positioning ring 60 abuts against the valve cover 20, the acting force is applied to the valve cover 20, the valve cover 20 is fixedly connected with the valve body 10, and the limiting effect on the valve rod 41 can be enhanced. It should be explained that the lower limit refers to the prevention of the valve stem 41 from moving in the direction of the flap 42.

The lateral wall of holding ring 60 sets up with the inner wall interval of sheath 30 to avoid holding ring 60 to drive the sheath 30 rotatory along with valve rod 41 is rotatory, thereby makes sheath 30 pine in valve gap 20 soon, moreover, can guarantee valve rod 41 pivoted flexibility, reduction moment of torsion.

The positioning ring 60 is capable of moving with the valve stem 41 along the axial direction of the valve stem 41 within the sheath 30.

Meanwhile, when the invention is assembled, the gate valve 100 needs to be installed in an inverted manner, when the first sealing element 53 or the second sealing element 55 of the sealing box 50 is damaged and needs to be replaced, the gate valve 100 is in a fully closed state, at this time, the gasket 412 is lower than the inner wall of the valve cover 20, water in the valve cavity 11 cannot leak out, the sheath 30 can be detached, the positioning ring 60 can be detached, and then the sealing box 50 can be detached for replacement, so that online maintenance can be realized.

The valve rod 41 is provided with a positioning groove 415, and the positioning ring 60 is clamped in the positioning groove 415 so as to be connected with the valve rod 41. So arranged, the retaining ring 60 can be more tightly connected to the valve stem 41.

The positioning ring 60 is in a circular truncated cone shape, the positioning ring 60 includes a first end surface 601 and a second end surface 602, the first end surface 601 is far away from the valve cover 20 relative to the second end surface 602, the outer diameter of the second end surface 602 is smaller than the outer diameter of the first end surface 601, and the outer diameter of the second end surface 602 is larger than the inner diameter of the opening of the end of the valve cover 20 close to the positioning ring 60, so as to be capable of sealing the opening of the valve cover 20, thereby limiting the sealing box 50.

The outer side wall of the circular truncated cone-shaped positioning ring 60 is an inclined surface, and one end of the sheath 30 is in a necking shape, so that the positioning ring 60 can be better limited.

The side of holding ring 60 has been seted up a strip seam 63, and holding ring 60 has relative first side 61 and the second side 62 that sets up, and strip seam 63 extends to second side 62 from first side 61, and the design of strip seam 63 can break off holding ring 60 off with the fingers and thumb when installing holding ring 60 to valve rod 41 for holding ring 60 is gone into the card smoothly in the constant head tank 415, and the sheath 30 plays the parcel effect to holding ring 60, makes behind holding ring 60 staple bolt valve rod 41, strip seam 63 does not open. The positioning ring 60 is made of metal.

Referring to fig. 8 and 9, the new gate valve 100 further includes a dust ring 70, an inner wall of the dust ring 70 abuts against the valve rod 41, and the dust ring 70 abuts against an inner wall of the sheath 30. The wiper 70 is used to keep the seal 50 clean and prevent dust from entering the first seal groove 52, which could break the first seal 53 as the valve stem 41 is rotated.

The positioning ring 60 does not abut the dust seal ring 70 and the seal box 50 at the same time at both end surfaces thereof, and the positioning ring 60 has an axial movement space in the sheath 30.

The dust ring 70 comprises a first portion 71 and a second portion 72 which are connected with each other, the wall thickness of the first portion 71 is smaller than that of the second portion 72, so that a first positioning step 73 is formed between the outer side wall of the first portion 71 and the outer side wall of the second portion 72, the valve cover 20 is abutted to the first positioning step 73, the first portion 71 is obliquely arranged relative to the axis of the dust ring 70, then, the inner wall of the first portion 71 is obliquely arranged relative to the inner wall of the dust ring 70, the inner wall of one end, far away from the second portion 72, of the first portion 71 is abutted to the outer wall of the valve rod 41, and the inner wall of the second portion 72 is arranged at an interval with the valve rod 41. So set up, when valve gap 20 supported on first location step 73, can strengthen the pressure of the inner wall of first section 21 and the laminating part of valve rod 41 for the partial inner wall that first portion 71 and the outer wall butt of valve rod 41 more hugs closely valve rod 41, and remaining part sets up with the outer wall interval of valve rod 41, makes things convenient for the installation of dust ring 70.

When the novel gate valve 100 needs to be closed, the valve rod 41 is rotated clockwise, so that the valve flap 42 moves away from the positioning ring 60 until the valve flap 42 abuts against the bottom wall of the valve cavity 11, at this time, the valve rod 41 continues to be rotated, because the valve flap 42 does not move axially any more, the nut seat 43 urges the valve rod 41 to move away from the valve flap 42 until the limiting structure 401 abuts against the inner wall of the valve cover 20, the novel gate valve is in a first state, namely, in a fully closed state, at this time, the positioning ring 60 abuts against the dust ring 70 and presses the dust ring 70, and the dust ring 70 presses the sheath 30, so that the sheath 30 rotates clockwise and is screwed on the valve cover 20; when the new gate valve needs to be opened, the valve rod 41 is rotated counterclockwise, so that the valve rod 41 moves downward until the positioning ring 60 abuts against the valve cover 20, at this time, the new gate valve 100 is in the second state, that is, in the open state, the positioning ring 60 is disengaged from the dust ring 70, the positioning ring 60 does not press the dust ring 70, the dust ring 70 does not press the sheath 30, the sheath 30 does not rotate counterclockwise along with the valve rod 41, and the sheath 30 is prevented from being unscrewed from the valve cover 20.

Example two

Referring to fig. 3 and fig. 4, the structure of the present embodiment is substantially the same as that of the first embodiment, and the description of the same parts is omitted, except that:

instead of the sealing caps 50, a plurality of the packing 80 are provided, the packing 80 is provided outside the valve rod 41 at intervals, a fifth sealing member 81 is provided between adjacent packing 80, and an end surface of one end of the packing 80 close to the positioning ring 60 abuts against the positioning ring 60. The envelope 80 is made of a flexible material such as plastic or rubber.

When the valve rod 41 is rotated anticlockwise, the sleeve 80 and the sleeve 80 are separated by the fifth sealing element 81, an extrusion space is formed in the middle of the fifth sealing element, the valve rod 41 moves towards the valve clack 42, the positioning ring 60 can extrude the sleeve 80 to release the abutting joint with the dust ring 70, the positioning ring 60 abuts against the valve cover 20 at the moment, the extrusion sleeve 80 can strengthen the sealing effect of the sleeve 80, the positioning ring 60 cannot drive the dust ring 70 to rotate, and the dust ring 70 cannot drive the sheath 30 to rotate anticlockwise.

The present invention also provides a method of assembling a gate valve 100 for installing a new gate valve 100, the method comprising:

s1, installing the valve core assembly 40 into the valve cavity 11;

s2 rotating the valve rod 41 to block the first port 12 and the second port 13;

s3, sleeving the valve cover 20 outside the valve rod 41 and fixedly connecting the valve cover 20 with the valve body 10, wherein the inner wall of the valve cover 20 abuts against the limiting structure 401;

s4, the positioning ring 60 is sleeved on the valve rod 41;

s5, arranging the dustproof ring 70 on the positioning ring 60 and sleeving the valve rod 41;

s6, the sheath 30 is mounted on the valve cap 20 and is sleeved outside the dust ring 70 and the positioning ring 60.

The steps before the S1 spool assembly 40 is installed in the valve chamber 11 further include:

s7 mounting the nut holder 43 on the valve flap 42;

s8 threadedly couples the screw to the nut holder 43.

The steps between S3 to S4 further include:

s9 is to fit the sealing box 50 on the valve rod 41 and fit the first fitting part 51 with the positioning part.

Specifically, when the first matching portion 51 is the boss 511 and the positioning portion is the limiting groove 231, the boss 511 is clamped in the limiting groove 231.

The step before S9 further includes:

s10 fits the third seal 414 into the third seal groove 413.

The process of installing the sealing box 50 includes:

s11 includes fitting the first seal member 53 into the first seal groove 52, and fitting the second seal member 55 into the second seal member 55.

The step before mounting the bonnet 20 to the valve body 10S 3 further comprises:

s12 sets the washer 412 on the stopper protrusion 411.

The assembly method of the gate valve 100 adopts a bottom-up assembly method, and the disassembly method is from top to bottom during maintenance, so that when devices such as the sealing box 50, the dust ring 70 and the like need to be replaced, online maintenance can be realized, and a water pipeline system does not need to be closed for maintenance.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A novel gate valve comprises a valve body (10), a valve cover (20), a sheath (30) and a valve core assembly (40), wherein the sheath (30) is arranged on the valve cover (20), openings at two ends of the valve cover (20) are arranged and cover the valve body (10), a valve cavity (11) is arranged in the valve body (10), a first port (12) and a second port (13) are formed in the valve body (10), the valve core assembly (40) penetrates through the sheath (30) and the valve cover (20), extends into the valve cavity (11) and can move along the axial direction of the valve core assembly (40) so as to control the communication or partition of the first port (12) and the second port (13);

its characterized in that, new-type gate valve still includes holding ring (60), sheath (30) wrap up in the holding ring (60) outside, case subassembly (40) include valve rod (41), be equipped with limit structure (401) on valve rod (41), holding ring (60) staple bolt valve rod (41), the one end of holding ring (60) can the butt in valve gap (20) can the capping valve gap (20) are close to the opening of holding ring (60), limit structure (401) are located in valve pocket (11), and can with the inner wall cooperation of valve gap (20), it is right to carry out axial spacing in valve rod (41).

2. The new gate valve according to claim 1, characterized in that the positioning ring (60) is in the shape of a circular truncated cone, the positioning ring (60) has a first end surface (601) and a second end surface (602), the diameter of the first end surface (601) is smaller than that of the second end surface (602), the second end surface (602) is arranged close to the valve cover (20), and the outer diameter of the second end surface (602) is larger than the inner diameter of the opening of the valve cover (20) at the end close to the positioning ring (60).

3. The new gate valve according to claim 1, characterized in that said valve stem (41) is provided with a positioning groove (415), and said positioning ring (60) is clamped in said positioning groove (415).

4. The new gate valve as claimed in claim 1, wherein the side of the positioning ring (60) is provided with a slit (63), the positioning ring (60) has a first side (61) and a second side (62) opposite to each other, and the slit (63) extends from the first side (61) to the second side (62).

5. The novel gate valve according to claim 1, characterized in that a dust ring (70) is arranged in the sheath (30), the inner wall of the dust ring (70) is abutted with the valve rod (41), the positioning ring (60) can move along the axial direction of the valve rod (41) in the sheath (30) along with the valve rod (41), one end of the dust ring (70) far away from the positioning ring (60) is abutted with the inner wall of the sheath (30), and the outer side wall of the positioning ring (60) is arranged at a distance from the inner wall of the sheath (30); sheath (30) with valve gap (20) threaded connection when new-type gate valve is in the first state, the terminal surface butt of holding ring (60) and dust ring (70), dust ring (70) can drive sheath (30) lock in valve gap (20) when new-type gate valve is in the second state, holding ring (60) with the butt is removed to the terminal surface of dust ring (70).

6. A new gate valve according to claim 5, characterized in that the dust ring (70) comprises a first portion (71) and a second portion (72) connected to each other, a first positioning step (73) is provided between the first portion (71) and the second portion (72), the sheath (30) abuts against the first positioning step (73), the first portion (71) is arranged obliquely relative to the axis of the dust ring (70), and the inner wall of the end of the first portion (71) far from the second portion (72) abuts against the outer wall of the valve stem (41).

7. The novel gate valve according to claim 1, wherein the valve core assembly (40) further comprises a plurality of envelopes (80), the envelopes (80) are sleeved outside the valve rod (41) at intervals, a fifth sealing element (81) is arranged between the adjacent envelopes (80), and the end surface of the envelope (80) close to the positioning ring (60) is convexly arranged relative to the end surface of the valve cover (20) close to the positioning ring (60) and is abutted to the positioning ring (60).

8. The novel gate valve according to claim 1, further comprising a sealing box (50), wherein the sealing box (50) is disposed in the valve cover (20), a first limiting portion (23) is disposed on the valve cover (20), a first matching portion (51) is disposed on the sealing box (50), the first limiting portion (23) can be matched with the first matching portion (51), and the end face of one end, close to the positioning ring (60), of the sealing box (50) is set in a manner of being retracted relative to the end face, close to the positioning ring (60), of the valve cover (20).

9. The novel gate valve of claim 8, characterized in that the inner side wall of the sealing box (50) is provided with a first sealing groove (52), a first sealing element (53) is arranged in the first sealing groove (52), the first sealing element (53) is abutted with the outer wall of the valve rod (41), a second sealing groove (54) is formed in the outer side wall of the sealing box (50), a second sealing element (55) is arranged in the second sealing groove (54), the second sealing element (55) is abutted against the inner wall of the valve cover (20), a third sealing groove (413) is formed in the valve rod (41), a third sealing element (414) is arranged in the third sealing groove (413), the third sealing element (414) is positioned between the sealing box (50) and the valve cavity (11), the third seal (414) abuts an inner wall of the valve cap (20).

10. The assembling method of the gate valve is used for assembling the novel gate valve, and is characterized in that the novel gate valve comprises a valve body (10), a valve cover (20), a sheath (30), a valve core assembly (40), a positioning ring (60), a sealing box (50) and a dust ring (70), the valve core assembly (40) comprises a valve rod (41), a limiting structure (401) is arranged on the valve rod (41), a valve cavity (11) is formed in the valve body (10), and the method comprises the following steps:

installing the valve core assembly (40) into the valve cavity (11);

sleeving the valve cover (20) outside the valve rod (41) and installing the valve cover (20) on the valve body (10), and abutting the inner wall of the valve cover (20) on the limiting structure (401);

sleeving the sealing box (50) outside the valve rod (41) and installing the sealing box in the valve cover (20);

sleeving the positioning ring (60) on the valve rod (41);

the dust ring (70) is arranged on the positioning ring (60) and sleeved outside the valve rod (41);

and the sheath (30) is arranged on the valve cover (20) and sleeved outside the dustproof ring (70) and the positioning ring (60).