CN216895789U

CN216895789U - Multiple sealed high stability stop valve

Info

Publication number: CN216895789U
Application number: CN202220645199.3U
Authority: CN
Inventors: 张景皓; 张建静; 潘建福
Original assignee: Hongchang Valve Co ltd
Current assignee: Hongchang Valve Co ltd
Priority date: 2022-03-22
Filing date: 2022-03-22
Publication date: 2022-07-05
Anticipated expiration: 2032-03-22

Abstract

The utility model provides a multi-seal high-stability stop valve, which belongs to the technical field of stop valves and comprises a valve body and a valve cover, wherein a valve rod, a valve clack and a valve clack seat are arranged in the valve body, a sealing step is arranged on the inner peripheral wall of a flow passage through hole in the valve clack seat, a plurality of sealing grooves are formed in the lower part of the sealing step, a sealing ring is arranged in each sealing groove, a metal sealing end face is arranged on the valve clack, a protruding part is arranged on the valve clack and used for being in sealing fit with the sealing ring, a corrugated pipe is arranged in a valve rod sleeve, a packing box is arranged between the valve rod and the valve cover and provided with a packing assembly, a packing pressing sleeve and a sealing base are respectively arranged above and below the packing box, a packing pressing plate is arranged on the packing pressing sleeve, and the packing pressing plate is connected with the valve cover through a slipknot bolt. The utility model is provided with a metal seal and a surface elastic seal between the valve clack and the valve clack seat, and has double seal and reliable seal, and the corrugated pipe is also arranged to prevent media from corroding the valve rod, and simultaneously, the sealing performance of the valve rod in the action process is improved through the structure of the stuffing box part.

Description

Multiple sealed high stability stop valve

Technical Field

The utility model relates to the technical field of stop valves, in particular to a multi-seal high-stability stop valve.

Background

A stop valve, also called a stop valve, is one of the most widely used valves, and belongs to a forced sealing type valve, so that when the valve is closed, pressure must be applied to a valve flap to force a sealing surface not to leak. The valve is popular because of small friction force between sealing surfaces in the opening and closing process, durability, small opening height, easy manufacture and convenient maintenance, and is not only suitable for medium and low pressure, but also suitable for high pressure. The closing principle of the stop valve is that the sealing surface of the valve clack is tightly attached to the sealing surface of the valve seat by means of the pressure of the valve lever, and the medium is prevented from flowing.

However, the structure length of the stop valve is longer than that of the gate valve, meanwhile, the fluid resistance is large, and the sealing reliability is not strong in long-term operation, so that the sealing performance of the stop valve needs to be enhanced in multiple aspects, and a sealing structure with good sealing performance needs to be designed at the sealing position of the valve clack and the valve seat; because the valve rod in the valve body is soaked in a medium, protection is needed, and meanwhile, the structure of the stuffing box is particularly important for improving the sealing performance.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects and shortcomings of the prior art and provide a multi-seal high-stability stop valve.

The technical scheme adopted by the utility model is as follows: a multi-seal high-stability stop valve comprises a valve body and a valve cover positioned on the valve body, wherein a valve rod, a valve clack connected with the valve rod and a valve clack seat for dividing a flow channel inside the valve body into an upper chamber and a lower chamber are arranged in the valve body, a flow channel through hole is formed in the valve clack seat, a sealing step is arranged on the lifting path of the valve clack in the inner peripheral wall of the flow channel through hole, a plurality of sealing grooves are formed in the lower portion of the sealing step, a sealing ring is installed in each sealing groove, a metal sealing end face is arranged at the position where the valve clack is abutted against the sealing step, a protruding portion is arranged on the valve clack and is in sealing fit with the sealing ring, a corrugated pipe is sleeved inside the valve rod and is positioned inside the valve body, the valve rod penetrates through the valve rod, a packing box is arranged between the valve rod and the packing box and is provided with a packing assembly, a packing pressing sleeve and a sealing base are respectively arranged above and below the packing pressing sleeve is provided with a packing pressing plate, the packing pressing plate is connected with the valve cover through a slipknot bolt.

The packing assembly comprises a V-shaped packing and an elastic bushing, the elastic bushing is arranged on the inner wall of the packing box, the V-shaped packing is arranged between the elastic bushing and the valve rod, the inner peripheral wall of the V-shaped packing is tightly attached to the valve rod, the outer peripheral wall of the V-shaped packing is tightly attached to the inner peripheral wall of the elastic bushing, and the inner peripheral wall of the V-shaped packing is tightly attached to the valve rod.

The valve body is connected with the valve cover through a bolt assembly, and a metal winding gasket is arranged between the valve body and the valve cover.

The connection part of the valve body and the valve cover is provided with an annular recess, the connection part of the valve cover and the valve body is provided with an annular bulge matched with the annular recess, and the metal winding gasket is positioned at the annular recess.

The valve comprises a valve body, a valve rod and a valve cover, wherein a connecting rod for fixing the valve rod is arranged between the valve cover and the valve rod, a threaded sleeve is arranged at the upper end of the connecting rod, the threaded sleeve is sleeved at the upper end of the valve rod, and the lower end of the connecting rod is fixedly connected to the valve cover.

And a valve rod nut is arranged between the valve rod and the threaded sleeve.

The upper end of the valve rod penetrates through a valve rod nut and is connected with a hand wheel in a linkage mode.

And a hand wheel part of the valve rod extending out is provided with a locking nut for fixing the hand wheel, and a gasket is arranged between the locking nut and the hand wheel.

And a valve clack cover is arranged between the valve clack and the valve rod, and the valve clack is in threaded connection with the valve clack cover.

The bottom of the valve rod is provided with an elastic pressing block, and the upper side and the lower side of the elastic pressing block are respectively abutted to the valve clack and the valve clack cover.

The utility model has the following beneficial effects:

according to the utility model, the valve flap seat is provided with the sealing step and the metal sealing end surface on the valve flap to form a metal sealing surface, and meanwhile, the lower part of the sealing step is provided with a plurality of sealing rings to form elastic sealing with the valve flap, so that double sealing is realized, and the sealing is reliable; the valve rod in the valve body is sleeved with a corrugated pipe to prevent the medium from eroding the valve rod; in addition, when the slipknot bolt is locked, the packing pressing plate presses on the packing pressing sleeve, so that the packing pressing sleeve presses the packing assembly in the packing box, and the sealing performance of the valve rod in the action process is improved.

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 description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.

FIG. 1 is a schematic view of the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

FIG. 3 is an enlarged view at B of FIG. 1;

in the figure, 1-valve body, 2-valve clack, 3-valve clack seat, 4-valve clack cover, 5-valve rod, 51-locking nut, 52-gasket, 6-corrugated pipe, 7-metal winding gasket, 8-valve cover, 9-slipknot bolt, 10-thread sleeve, 11-valve rod nut, 12-hand wheel, 13-connecting rod, 14-packing press plate, 15-packing press sleeve, 16-packing box, 17-sealing base, 18-elastic press block, 19-bulge, 20-sealing ring, 21-sealing groove, 22-sealing step, 23-metal sealing end face, 24-V-shaped packing and 25-elastic bushing.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, which are not described in any more detail in the following embodiments.

The terms of direction and position of the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer to the direction and position of the attached drawings. Accordingly, the use of directional and positional terms is intended to illustrate and understand the present invention and is not intended to limit the scope of the present invention.

As shown in fig. 1 to 3, an embodiment of the present invention is provided:

a multi-seal high-stability stop valve comprises a valve body 1 and a valve cover 8 positioned on the valve body 1, wherein a valve rod 5, a valve clack 2 connected with the valve rod 5 and a valve clack seat 3 separating an internal flow channel of the valve body 1 into an upper chamber and a lower chamber are arranged in the valve body 1, a flow channel through hole is formed in the valve clack seat 3, a sealing step 22 is arranged on a lifting path of the valve clack 2 on the inner peripheral wall of the flow channel through hole, a multi-channel sealing groove 21 is arranged on the lower portion of the sealing step 22, a sealing ring 20 is arranged in the sealing groove 21, a metal sealing end face 23 is arranged at the position where the valve clack 2 is abutted to the sealing step 22, the valve clack 2 is provided with a bulge 19 for sealing match with the sealing ring 20, when the valve clack 2 is embedded into the valve clack seat 3, the sealing step 22 and the metal sealing end face 23 form a metal sealing face, and the multi-channel sealing ring 20 and the bulge 19 of the valve clack 2 form elastic sealing, and the sealing performance of the stop valve is greatly improved due to double sealing.

The valve rod 5 is located in the valve body 1, the inner portion of the valve rod is sleeved with the corrugated pipe 6, the valve rod 5 is prevented from being corroded by media, the valve rod 5 penetrates through the valve cover 8, the stuffing box 16 is arranged between the valve rod and the valve cover 8, the stuffing box 16 is provided with the stuffing assembly, the stuffing pressing sleeve 15 and the sealing base 17 are arranged above and below the stuffing box 16 respectively, the stuffing pressing sleeve 15 is provided with the stuffing pressing plate 14, the stuffing pressing plate 14 is connected with the valve cover 8 through the loose joint bolt 9, the corrugated pipe 6 is of a multilayer wave structure, media are effectively prevented from being impacted and eroded, and when the corrugated pipe 6 fails, the stuffing box 16 in the valve still plays a sealing role.

In this embodiment, the packing assembly includes a V-shaped packing 24 and an elastic bushing 25, the elastic bushing 25 is disposed on the inner wall of the packing box 16, the V-shaped packing 24 is disposed between the elastic bushing 25 and the valve rod 5, the inner circumferential wall of the V-shaped packing 24 is tightly attached to the valve rod 5, and the outer circumferential wall is tightly attached to the inner circumferential wall of the elastic bushing 25, when the loose joint bolt 9 is locked, the packing press plate 14 presses on the packing press sleeve 15 so that the packing press sleeve 15 presses the V-shaped packing 25 in the packing box, at the same time, the V-shaped packing 25 deforms towards the outer and inner circumferential directions under the action of an axial force, the valve rod 5 is tightly attached inwards, the elastic bushing 25 is tightly attached outwards, effective sealing between the valve rod 5 and the bonnet 8 can be achieved, the elastic bushing 25 has elasticity, and the elastic bushing 25 is compressed and stored energy while the V-shaped packing 24 deforms and presses the elastic bushing 25, when the inner side of the V-shaped packing 24 is abraded, the elastic bushing 25 releases energy and provides extrusion force of the V-shaped packing 24 towards the center of the V-shaped packing 24, so that the V-shaped packing 24 is always kept in a state of being attached to the valve rod 5, the sealing property between the valve rod 5 and the valve cover 8 is further improved, the micro-leakage of the valve can be prevented, and the production safety is further ensured.

The valve body 1 and the valve cover 8 are connected through a bolt assembly, a metal winding gasket 7 is arranged between the valve body 1 and the valve cover 8, the metal winding gasket is formed by alternately overlapping and spirally winding SUS304 and graphite, a metal band is fixed at the beginning and the tail end in a spot welding mode, the sealing performance between the valve body 1 and the valve cover 8 can be improved, the service life is prolonged, and the bolt assembly comprises a stud and a nut.

The department of being connected of valve body 1 and valve gap 8 is equipped with the annular and caves in, valve gap 8 with the department of being connected of valve body 1 be equipped with the annular is sunken complex annular protruding, metal winding gasket 7 is located annular sunken department, when valve body 1 and valve gap 8 assemble, the annular is protruding to be embedded into the annular and caves in and supports metal winding gasket 7, further promotes the sealing performance between valve body 1 and the valve gap 8.

A connecting rod 13 for fixing the valve rod 5 is arranged between the valve cover 8 and the valve rod 5 to prevent the valve rod 5 from rotating or deforming and breaking due to stress, a threaded sleeve 10 is arranged at the upper end of the connecting rod 13, the upper end of the valve rod 5 is sleeved with the threaded sleeve 10, and the lower end of the connecting rod 13 is fixedly connected to the valve cover 8; a valve rod nut 11 is arranged between the valve rod 5 and the threaded sleeve 10; the upper end of the valve rod 5 penetrates through a valve rod nut 11 and is connected with a hand wheel 12 in a linkage manner; a locking nut 51 for fixing the hand wheel 12 is arranged on the part of the valve rod 5 extending out of the hand wheel 12, and a gasket 52 is arranged between the locking nut 51 and the hand wheel 12; the rotating hand wheel 12 drives the valve rod 5 to rotate, the valve rod 5 moves upwards to drive the valve clack 2 to be separated from the inner wall of the flow passage through hole in the valve body 1, the valve is opened, and the valve can be closed and opened flexibly by reversing the hand wheel 12.

A valve clack cover 4 is arranged between the valve clack 2 and the valve rod 5, the valve clack 2 is in threaded connection with the valve clack cover 4, the valve clack cover 4 is installed on the valve rod 5, when the valve rod 5 rotates, the valve clack 2 does not rotate and only can move along with the lifting of the valve rod 5, and the valve clack 2 is prevented from rotating to generate friction with a valve clack seat 3 to cause abrasion; meanwhile, the valve clack 2 is connected by threads, and if damaged, the valve clack is only required to be screwed down from the valve clack cover 4 for replacement, so that the valve clack is very convenient and fast.

Furthermore, the bottom of the valve rod 5 is provided with an elastic pressing block 18, the upper side and the lower side of the elastic pressing block 18 are respectively abutted to the valve clack 2 and the valve clack cover 4, when the valve is closed, the valve clack 2 is abutted to the valve clack seat 3, and usually, the sealing condition when the valve is closed can not be determined, so that the sealing effect of a sealing port is often excessive when the valve is closed, so that a sealing surface is easily worn, and the elastic pressing block 18 provides pretightening force and elastic sealing effect, so that the valve clack 2 and the valve clack seat 3 are prevented from being damaged due to transitional abutting pressure.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the utility model is not limited by the scope of the appended claims.

Claims

1. The utility model provides a multiple seal high stability stop valve, includes valve body (1) and valve gap (8) that is located on valve body (1), be equipped with valve rod (5) in valve body (1), valve clack (2) be connected with valve rod (5) and separate into valve clack seat (3) of cavity and lower cavity with valve body (1) inside runner, be equipped with the runner through-hole on valve clack seat (3), its characterized in that, runner through-hole internal perisporium is in be equipped with sealed step (22) on valve clack (2) lift route, the lower part of sealed step (22) is equipped with multichannel seal groove (21), install sealing washer (20) in seal groove (21), the position that valve clack (2) and sealed step (22) offset is equipped with metal seal terminal surface (23), valve clack (2) are equipped with bellying (19) and are used for sealing up with sealing washer (20) and cooperate, the valve rod (5) are located valve body (1) internal sleeve and are equipped with bellows (6), the valve rod (5) penetrates through the valve cover (8) and a packing box (16) is arranged between the valve cover and the valve cover, a packing assembly is arranged in the packing box (16), a packing pressing sleeve (15) and a sealing base (17) are respectively arranged above and below the packing box (16), a packing pressing plate (14) is arranged on the packing pressing sleeve (15), and the packing pressing plate (14) is connected with the valve cover (8) through a slipknot bolt (9).

2. The multiple-seal high-stability stop valve according to claim 1, wherein the packing assembly comprises a V-shaped packing (24) and an elastic bushing (25), the elastic bushing (25) is arranged on the inner wall of the packing box (16), the V-shaped packing (24) is arranged between the elastic bushing (25) and the valve rod (5), the inner peripheral wall of the V-shaped packing (24) is tightly attached to the valve rod (5) and the outer peripheral wall of the V-shaped packing (24) is tightly attached to the inner peripheral wall of the elastic bushing (25).

3. The multiple-seal high-stability stop valve according to claim 1, wherein the valve body (1) and the valve cover (8) are connected through a bolt assembly, and a metal wound gasket (7) is arranged between the valve body and the valve cover.

4. A multiple-sealing high-stability stop valve according to claim 3, characterized in that the joint of the valve body (1) and the valve cover (8) is provided with an annular recess, the joint of the valve cover (8) and the valve body (1) is provided with an annular protrusion matched with the annular recess, and the metal wound gasket (7) is positioned in the annular recess.

5. The multiple-seal high-stability stop valve according to claim 1, wherein a connecting rod (13) for fixing the valve rod (5) is arranged between the valve cover (8) and the valve rod (5), a threaded sleeve (10) is arranged at the upper end of the connecting rod (13), the threaded sleeve (10) is sleeved at the upper end of the valve rod (5), and the lower end of the connecting rod (13) is fixedly connected to the valve cover (8).

6. A multiple-seal high-stability stop valve according to claim 5, characterized in that a valve stem nut (11) is arranged between the valve stem (5) and the threaded sleeve (10).

7. The multiple-seal high-stability stop valve according to claim 1, wherein a hand wheel (12) is connected to the upper end of the valve rod (5) in a linkage mode through a valve rod nut (11).

8. The multiple-seal high-stability stop valve according to claim 7, wherein a locking nut (51) for fixing the hand wheel (12) is arranged on the part, extending out of the hand wheel (12), of the valve rod (5), and a gasket (52) is arranged between the locking nut (51) and the hand wheel (12).

9. The multiple-seal high-stability stop valve according to claim 1, characterized in that a valve flap cover (4) is arranged between the valve flap (2) and the valve rod (5), and the valve flap (2) is connected with the valve flap cover (4) through threads.

10. The multiple-seal high-stability stop valve according to claim 9, wherein an elastic pressing block (18) is arranged at the bottom of the valve rod (5), and the upper side and the lower side of the elastic pressing block (18) are respectively abutted to the valve flap (2) and the valve flap cover (4).