CN215596445U

CN215596445U - Ultra-low temperature gate valve

Info

Publication number: CN215596445U
Application number: CN202122305812.5U
Authority: CN
Inventors: 王光全; 毛希豪
Original assignee: Sichuan Grv Flow Controls Co ltd
Current assignee: Sichuan Grv Flow Controls Co ltd
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2022-01-21
Anticipated expiration: 2031-09-23

Abstract

The utility model relates to the technical field of valves, and discloses an ultralow-temperature gate valve which is mainly used for solving the problems that a long-neck valve cover is difficult to integrally process and high in manufacturing cost. The long-neck valve cover is divided into the stuffing box, the lengthened pipe and the valve cover, and each part is processed respectively, so that the processing precision can be determined according to the matching precision required by each part, the integral forming is avoided, the processing difficulty can be integrally reduced, the processing time is saved, and the manufacturing cost is further reduced.

Description

Ultra-low temperature gate valve

Technical Field

The utility model belongs to the technical field of valves, and particularly relates to an ultralow-temperature gate valve.

Background

In the pipeline transportation of liquid, oil and other media, the gate valve is a valve with very high utilization rate, can be used for cutting off the circulation of the media, and has the characteristics of small flow resistance coefficient, good sealing performance and strong adaptability. The gate valve can be divided into a rising stem gate valve and a non-rising stem gate valve, and the main structures of the rising stem gate valve and the non-rising stem gate valve comprise a valve body, a flashboard, a valve rod and a valve cover. The rising stem gate valve drives the flashboard to ascend and descend through the thread transmission between the valve rod and the hand wheel, and the valve rod of the rising stem gate valve is exposed outside, so that the opening and closing and the position of the flashboard can be judged visually; the hidden rod gate valve drives the flashboard to ascend and descend by rotating the valve rod at a fixed point, and in the opening and closing process of the valve, the valve rod only rotates in situ, and the opening and closing state of the valve cannot be judged by naked eyes. Therefore, the rising stem gate valve is wider in application range.

For the gate valve which needs to work in low-temperature or even ultra-low-temperature environment, not only the gate valve is made of low-temperature resistant materials, but also the influence of low temperature on sealing filler needs to be considered, and the good sealing property and the service life of the gate valve are ensured; meanwhile, the hand wheel is protected from being damaged by low temperature when an operator rotates the hand wheel.

Based on the above two points, the gate valve working in low-temperature or even ultra-low-temperature environment generally enables the valve cover to be lengthened, so that the filler is far away from the low-temperature valve body as far as possible, the filler is prevented from losing the sealing performance due to low temperature, the service life of the gate valve is further prolonged, and meanwhile, the phenomenon that the low temperature is too low due to the fact that the low temperature is transferred to the hand wheel can be avoided, and operators are harmed.

However, the lengthened valve cover in the existing low-temperature gate valve is integrally formed, the upper end and the lower end of the lengthened valve cover are respectively matched with the filler and the valve rod, the required inner hole precision is high, the lengthened transition part in the middle of the lengthened valve cover is not matched with the valve rod, and the requirement on the inner hole precision is low. Therefore, if the integral forming method is adopted, the middle part of the valve cover also needs to be processed according to the high-precision requirements of the upper end and the lower end of the valve cover, so that the difficulty of the whole processing is undoubtedly increased, the processing time is wasted, the manufacturing cost is also improved, and the cost performance is lower.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides the ultralow-temperature gate valve, which can ensure the precision of the matching part of the valve cover, reduce the processing difficulty of the middle part of the valve cover, save the processing time and reduce the overall manufacturing cost of the gate valve.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides an ultra-low temperature gate valve, includes valve body, flashboard, valve rod and long neck valve gap, and the flashboard is located the valve body, the vertical sealing connection of long neck valve gap and valve body, its characterized in that, valve rod are located the long neck valve gap, and the valve rod lower extreme links to each other with the flashboard, the long neck valve gap includes packing box, extension pipe, valve gap, packing box, extension pipe and valve gap correspond sealing connection from last to down in proper order.

Furthermore, a filler is arranged between the lower end of the filler box and the valve rod, a filler gasket is arranged below the filler, and a filler pressing sleeve is arranged above the filler gasket.

Furthermore, sealing rings are arranged between the packing pressing sleeve and the valve rod and between the packing pressing sleeve and the packing box, and the sealing rings can be but are not limited to O-shaped rings, V-shaped rings, Y-shaped rings and the like.

Furthermore, a packing pressing plate is arranged above the packing pressing sleeve and connected with the packing box through an eyelet bolt.

Further, still include valve-stem nut, valve-stem nut locates the upper end position of valve rod, and the valve-stem nut lower extreme is equipped with the flange, is equipped with the gland with flange looks adaptation on the valve-stem nut outer wall.

Furthermore, the outer wall of the gland is connected with the upper end of the stuffing box through threads, and a screw is arranged between the gland and the stuffing box.

Furthermore, friction gaskets are arranged between the valve rod nut and the gland and between the valve rod nut and the stuffing box.

Further, the valve cover is vertically and hermetically connected with the valve body through a stud, and a coating gasket is arranged between the valve cover and the valve body.

Furthermore, the valve rod nut further comprises a hand wheel, and the hand wheel is circumferentially connected with the valve rod nut through a plurality of connecting rods.

Further, the valve rod lower extreme is equipped with the shape of falling T and connects, and the lower bottom surface that connects is the cambered surface, be equipped with on the flashboard and connect corresponding T shape mounting groove with the valve rod lower extreme shape of falling T, mounting groove bottom surface middle part is equipped with the recess.

Compared with the prior art, the utility model has the following beneficial effects:

1. the long-neck valve cover is divided into the stuffing box, the lengthening pipe and the valve cover, each part is processed respectively and then is sequentially and correspondingly connected in a sealing manner from top to bottom, the processing precision can be determined according to the matching precision required by each part, the integral forming is avoided, the processing difficulty is integrally reduced, the processing time is saved, and the manufacturing cost can be further reduced.

2. The stuffing is arranged between the stuffing box and the valve rod, so that the sealing between the stuffing box and the valve rod can be ensured, and the leakage of a conveying medium is prevented; and a packing gasket is arranged below the packing, a packing pressing sleeve is arranged above the packing, and the packing pressing sleeve and the packing box are matched to form a packing space with the valve rod, so that the leakage of the packing can be avoided.

3. All be equipped with the sealing washer between packing pressure sleeve and valve rod and packing box, guarantee the sealed between valve rod and the packing box, prevent that the packing from taking place to leak.

4. A packing pressing plate is arranged above the packing pressing sleeve, so that packing between the valve rod and the packing box can be fully pressed, the leakage of the packing is prevented, and the normal movement of the valve rod is ensured; the packing pressing plate is connected with the packing box through the swing bolt, the lower end of the swing bolt is connected to the packing box through the cylindrical pin, the upper end of the swing bolt is screwed up through the nut, the elastic gasket is further arranged between the nut and the packing pressing plate, when the packing is worn, the elastic gasket can compensate the lost space, and the packing is always in a compressed state.

5. The utility model belongs to a rising stem gate valve, a valve rod nut is arranged at the upper end of a valve rod, the valve rod nut, a gland and a stuffing box are mutually matched to form a valve rod driving device, and the valve rod nut is rotated to enable a valve rod to move up and down, so that a flashboard is driven to do lifting motion to open and close a pipeline.

6. The outer wall of the gland is connected with the upper end of the packing box through the inner thread and the outer thread, the screw is arranged between the outer wall of the gland and the upper end of the packing box, the screw can enable the threaded connection between the gland and the packing box to be stable, and the reduction of the rotating efficiency of the valve rod nut caused by the relative motion between the gland and the packing box is avoided.

7. All be equipped with friction pad between valve rod nut's the flange up end and the gland and under the flange between terminal surface and the packing box, can increase the frictional force between flange and gland and the packing box, reduce wearing and tearing between the three, and then increase holistic life.

8. The valve cover is vertically and hermetically connected with the valve body through the stud, and the valve cover and the valve body are also provided with the coating gaskets, so that good sealing performance between the valve cover and the valve body can be ensured, the damage to the valve caused by leakage of a conveying medium is avoided, and the service life of the valve can be prolonged.

9. The valve rod lower extreme is equipped with the shape of falling T and connects, and is corresponding with the T shape mounting groove that establishes on the flashboard, connects the cambered surface of bottom surface and can cooperatees with the recess of mounting groove bottom surface, can make the flashboard be perpendicular to pipeline path completely, avoids when it closes, and the skew leads to the gate valve to seal incompletely and makes the condition of carrying the medium leakage appear.

Drawings

Fig. 1 is a structural sectional view of the present invention.

Fig. 2 is a schematic structural view along the axial direction of the valve body.

Wherein, 1-valve body; 2-a gate plate; 3-a valve stem; 4-long neck valve cover; 4.1 of a stuffing box, 4.2 of an extension pipe and 4.3 of a valve cover; 5-a packing pad; 6-a filler; 7-packing and pressing; 8-sealing ring; 9-a packing press plate; 10-swing bolt; 11-valve stem nut; 12-a gland; 13-a rubbing pad; 14-a clad shim; 15-hand wheel; 16-a connecting rod; 17-cylindrical pins; 18-resilient gasket.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in fig. 1, the ultra-low temperature gate valve comprises a valve body 1, a gate plate 2, a valve rod 3 and a long-neck valve cover 4, wherein the gate plate 2 is positioned in the valve body 1; the long-neck valve cover 4 is vertically and hermetically connected with the valve body 1; the valve rod 3 is positioned in the long-neck valve cover 4, and the lower end of the valve rod is connected with the flashboard 2; the long-neck valve cover 4 comprises a stuffing box 4.1, an extension pipe 4.2 and a valve cover 4.3 which are welded from top to bottom in sequence.

Divide long neck valve gap 4 into packing box 4.1, extension pipe 4.2 and valve gap 4.3 three parts, each part is processed respectively and is formed, avoids integrated into one piece, and can confirm the machining precision according to the required cooperation precision of each part, has wholly reduced the degree of difficulty of processing, saves process time, and then reduces manufacturing cost.

The packing 6 is arranged between the packing box 4.1 and the valve rod 3, and the packing 6 is V-shaped packing, so that the sealing property between the packing box 4.1 and the valve rod 3 can be ensured, and the conveying medium is prevented from leaking; a packing gasket 5 is arranged below the packing 6, a packing pressing sleeve 7 is arranged above the packing 6, and the packing pressing sleeve and the packing box 4.1 are matched with the valve rod 3 to form a packing space, so that the leakage of the packing 6 can be avoided; all be equipped with sealing washer 8 between packing pressure sleeve 7 and valve rod 3 and packing box 4.1, sealing washer 8 is O type circle, can guarantee the leakproofness between valve rod 3 and the packing box 4.1, prevents that packing 6 from taking place to leak.

A packing pressing plate 9 is arranged above the packing pressing sleeve 7, so that the packing 6 between the valve rod 3 and the packing box 4.1 can be sufficiently pressed, and the valve rod 3 is prevented from being frozen due to leakage and affecting the up-and-down motion of the valve rod; the packing pressing plate 9 is connected with the packing box 4.1 through the swing bolt 10, the lower end of the swing bolt 10 is connected with the packing box 4.1 through the cylindrical pin 17, the upper end of the swing bolt 10 is screwed up on the packing pressing plate 9 through the nut, the elastic gasket 18 is further arranged between the nut and the packing pressing plate 9, the elastic gasket 18 is a disc spring set, and after the packing 6 is worn, the elastic gasket 18 can compensate the lost space, so that the packing 6 is always in a compressed state.

The utility model belongs to a rising stem gate valve, a valve rod nut 11 is arranged at the upper end of a valve rod 3, a flange is arranged at the lower end of the valve rod nut 11, a gland 12 corresponding to the flange is arranged on the outer wall of the valve rod nut 11, the gland 12 and a packing box 4.1 are mutually matched to form a valve rod 3 driving device, and the valve rod 3 can move up and down by rotating the valve rod nut 11, so that a flashboard 2 is driven to move up and down to open and close a pipeline.

The outer wall of the gland 12 is connected with the upper end of the stuffing box 4.1 through the inner thread and the outer thread, a screw is arranged between the outer wall of the gland 12 and the upper end of the stuffing box 4.1, the screw can enable the threaded connection between the gland 12 and the stuffing box 4.1 to be stable, and the reduction of the rotating efficiency of the valve rod nut 11 caused by the relative motion between the gland 12 and the stuffing box 4.1 is avoided.

All be equipped with friction pad 13 between stem nut 11's flange up end and gland 12 and between flange lower extreme face and stuffing box 4.1, can increase the frictional force between flange and gland and the stuffing box, reduced the wearing and tearing between stem nut 11, gland 12, the stuffing box 4.1 three, and then increase holistic life.

The valve cover 4.3 is vertically and hermetically connected with the valve body 3 through the stud, and the coating gasket 14 is arranged between the valve cover 4.3 and the valve body 3, so that good sealing performance between the valve cover 4.3 and the valve body 3 can be ensured, the damage to the valve caused by leakage of a conveying medium is avoided, and the service life of the valve can be prolonged.

Still including hand wheel 15, hand wheel 15 and valve-stem nut 11 are through 16 circumferential connections of a plurality of connecting rods, and accessible operating personnel hand rotation hand wheel 17 drives valve-stem nut 12 rotatory, and then makes valve rod 3 drive flashboard 2 up-and-down motion.

The lower extreme at valve rod 3 is equipped with the shape of falling T and connects, and is corresponding with the T shape mounting groove that establishes on flashboard 2, and the cambered surface that connects the bottom surface can cooperate with the recess of mounting groove bottom surface, can guarantee flashboard 2 complete perpendicular to pipeline channel, avoids it when closing, and the sealed incomplete and the condition that leads to the transport medium to leak that the offset brought appears.

It is to be understood that the above-described embodiments are only a few, and not all, embodiments of the present invention. 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.

Claims

1. The utility model provides an ultra-low temperature gate valve, includes valve body (1), flashboard (2), valve rod (3) and long neck valve gap (4), and flashboard (2) are located valve body (1), and long neck valve gap (4) and the vertical sealing connection of valve body (1), its characterized in that, and valve rod (3) are located long neck valve gap (4), and valve rod (3) lower extreme links to each other with flashboard (2), long neck valve gap (4) are including packing box (4.1), extension pipe (4.2), valve gap (4.3), packing box (4.1), extension pipe (4.2) and valve gap (4.3) are from last to corresponding sealing connection down in proper order.

2. Ultra-low temperature gate valve according to claim 1, characterized in that a packing (6) is arranged between the lower end (4.1) of the packing box and the valve rod (3), a packing gasket (5) is arranged below the packing (6), and a packing pressing sleeve (7) is arranged above the packing.

3. Ultra-low temperature gate valve according to claim 2, characterized in that a sealing ring (8) is arranged between the packing press sleeve (7) and the valve rod (3) and the packing box (4.1).

4. Ultra-low-temperature gate valve according to claim 3, characterized in that a packing pressure plate (9) is arranged above the packing pressure sleeve (7), and the packing pressure plate (9) is connected with the stuffing box (4.1) through an eyelet bolt (10).

5. An ultra-low temperature gate valve according to claim 1, characterized by further comprising a valve rod nut (11), wherein the valve rod nut (11) is arranged at the upper end position of the valve rod (3), a flange is arranged at the lower end of the valve rod nut (11), and a gland (12) matched with the flange is arranged on the outer wall of the valve rod nut (11).

6. Ultra-low-temperature gate valve according to claim 5, characterized in that the outer wall of the gland (12) is connected with the upper end of the stuffing box (4.1) through threads, and a screw is arranged between the gland (12) and the stuffing box (4.1).

7. Ultra-low temperature gate valve according to claim 5, characterized in that friction washers (13) are provided between the stem nut (11) and the gland (12) and between the stem nut (11) and the stuffing box (4.1).

8. An ultra-low temperature gate valve according to claim 1, characterized in that the valve cover (4.3) is vertically and hermetically connected with the valve body (1) through a stud, and a cladding gasket (14) is arranged between the valve cover (4.3) and the valve body (1).

9. Ultra-low temperature gate valve according to claim 1, characterized by further comprising a hand wheel (15), wherein the hand wheel (15) is circumferentially connected with the stem nut (11) by a plurality of connecting rods (16).

10. An ultra-low temperature gate valve according to claim 1, characterized in that, the lower end of the valve rod (3) is provided with an inverted T-shaped joint, the lower bottom surface of the joint is an arc surface, the flashboard (2) is provided with a T-shaped mounting groove corresponding to the inverted T-shaped joint at the lower end of the valve rod (3), and the middle part of the bottom surface of the mounting groove is provided with a groove.