CN212297660U

CN212297660U - Low-temperature stop valve

Info

Publication number: CN212297660U
Application number: CN202020416328.2U
Authority: CN
Inventors: 卓玉锋; 陈磊
Original assignee: Ningbo Duken Valve Manufacturing Co ltd
Current assignee: Ningbo Duken Valve Manufacturing Co ltd
Priority date: 2020-03-27
Filing date: 2020-03-27
Publication date: 2021-01-05
Anticipated expiration: 2030-03-27

Abstract

The utility model discloses a low-temperature stop valve, the key point of the technical scheme is a low-temperature stop valve, which comprises a valve body, a valve clack, a valve rod and a valve cover, wherein a fluid passage is arranged in the valve body, the upper end of the valve body is fixedly connected with the valve cover through a hexagon bolt, one end of the valve clack is matched with a valve seat arranged in an inner cavity of the valve body to form a hard seal with surface-to-surface contact, the other end of the valve clack is connected with one end of the valve rod through a positioning and fixing connecting part, the other end of the valve rod sequentially penetrates through the valve cover, an extension pipe and an elastic sealing device and is connected with a driving device, a screw sleeve is arranged between the valve rod and the valve cover, the screw sleeve is provided with a thread, the; the utility model relates to a rationally, the passageway is smooth, long service life, resistance to pressure are strong, resistant towards the strong, sealed reliable, the high characteristics of security performance.

Description

Low-temperature stop valve

Technical Field

The utility model relates to a stop valve technical field, more specifically the utility model relates to a low temperature stop valve that says so.

Background

The low-temperature stop valve is a valve with a closing member (valve clack) moving along the central line of a valve seat, according to the moving form of the valve clack, the change of a valve seat through opening is in direct proportion to the stroke of the valve clack, and the valve rod of the valve is relatively short in opening or closing stroke and has a very reliable cutting function, and the change of the valve seat through opening is in direct proportion to the stroke of the valve clack and is very suitable for adjusting the flow, so the valve is very suitable for cutting or adjusting and throttling; in the prior art, when the stop valve is used, a valve port is directly blocked by a valve clack, but the valve clack is not tightly contacted with a valve body, so that a gap is easy to appear, and the water leakage phenomenon of the stop valve is caused; in a low-temperature environment, the stop valve has higher requirements on a sealing element between the valve body and the valve rod, so that the medium can not be leaked and external impurities cannot enter; at present, chinese utility model that bulletin number is CN209245260U discloses a low temperature stop valve, though this kind of low temperature stop valve has solved the sealed and lax problem of packing in the stop valve, does not solve the sealed problem of valve clack and disk seat, valve body and valve rod, and is sealed not enough, leads to revealing easily, causes safety problem and pollution, and this low temperature stop valve resistance to pressure, impact resistance can not enough.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a low temperature stop valve, this low temperature stop valve have characteristics such as reasonable in design, the passageway is smooth, long service life, the resistance to pressure is strong, resistant impact property is strong, sealed reliable, security performance height.

In order to achieve the above purpose, the utility model provides a following technical scheme:

a low-temperature stop valve comprises a valve body, a valve clack, a valve rod and a valve cover, wherein a fluid channel is arranged in the valve body, the upper end of the valve body is fixedly connected with the valve cover through a hexagon bolt, one end of the valve clack is matched with a valve seat arranged in an inner cavity of the valve body to form a hard seal with surface contact, the other end of the valve clack is connected with one end of the valve rod through a positioning and fixing connecting part, the other end of the valve rod sequentially penetrates through the valve cover, an extension pipe and an elastic sealing device and is connected with a driving device, a threaded sleeve is arranged between the valve rod and the valve cover, the upper end of the valve cover is provided with the extension pipe and is connected with the valve;

technical scheme more than adopting, the utility model has the advantages of it is following:

the upper end of the valve body of the utility model is fixedly connected with the valve cover through the hexagon bolt, so that the valve body is more convenient to replace after being damaged; one end of the valve clack is matched with a valve seat arranged in the inner cavity of the valve body to form a hard seal with surface-to-surface contact, so that a medium is not easy to leak when passing through a fluid channel, and the sealing property is strong; be provided with the swivel nut between valve rod and the valve gap, the swivel nut has the screw thread, and the screw thread cooperatees with the valve rod, avoids the valve rod to sting the condition like this and takes place.

Furthermore, the positioning and fixing connecting part comprises a steel ball, a positioning screw, a first mounting groove and a second mounting groove, the first mounting groove is arranged on the valve clack, the second mounting groove is arranged at one end of the valve rod, the first mounting groove and the second mounting groove are matched through the steel ball, so that the valve rod is in positioning connection with the valve clack, and the positioning screw is arranged on the valve clack;

the connecting part is fixed in the middle position, so that the valve rod and the valve clack are more accurately positioned, and the valve rod is prevented from being worn and damaged when moving up and down; the valve rod and the valve clack of the utility model are connected by the steel ball, so that the matching is more flexible and the connection strength is greatly improved; and a positioning screw is arranged on the valve clack, so that the valve clack and the valve rod are firmer.

Furthermore, the elastic sealing device comprises a spring, a V-shaped sealing ring, an O-shaped ring, a pressing sleeve, a sealing cover, a compression nut and a locking nut, and the sealing cover is fixedly connected with the valve rod through the compression nut and the locking nut;

the utility model can adjust the position of the elastic sealing device up and down through the compression nut and the locking nut; sealed lid compresses tightly through gland nut with the valve rod, and rethread lock nut is fixed, can also prevent that the subassembly is not hard up among the elastic seal device to improved product life and sealing performance, in addition through lock nut's rotatory locking, make gland nut compress tightly the spring, make the elasticity of spring change according to compressing tightly the degree.

Furthermore, the V-shaped sealing ring, the pressing sleeve and the spring are sequentially arranged between the sealing cover and the valve rod upwards, and the spring is sleeved on the pressing sleeve;

the V-shaped sealing ring, the pressing sleeve and the spring of the utility model are sequentially arranged upwards between the sealing cover and the valve rod to form multiple sealing, so that the valve rod is not easy to leak and damage during operation, and the pressing sleeve and the V-shaped sealing ring can be prevented from loosening in the use process of the stop valve, thereby prolonging the service life and improving the sealing performance of the product; the utility model discloses the spring housing is in press and sheathe in, have the effect of buffering, strengthened the utility model discloses a resistance to pressure, impact resistance.

Furthermore, two annular grooves are formed in the pressing sleeve, the two annular grooves are respectively positioned on one side of the sealing cover and one side of the valve rod, and O-shaped rings are embedded in the two annular grooves;

two annular grooves are located sealed lid one side and valve rod one side respectively, and it has O type circle to imbed again in the annular groove, has promoted sealed lid and has pressed the leakproofness between cover and the valve rod between the cover.

Furthermore, two ends of the valve body are provided with connecting flanges and are connected through welding, and the center lines of the valve body and the connecting flanges at the two ends of the valve body are on the same straight line;

the valve body and the connecting flange of the utility model are connected by welding, so that the circulation channel is firmer; the utility model discloses valve body and flange central line are on same straight line for when the valve was flowed through to the medium, form straight through circulation passageway, greatly reduced medium circulation resistance.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a perspective view of a cryogenic stop valve.

Fig. 2 is an enlarged schematic view at a.

Fig. 3 is an enlarged schematic view at B.

Fig. 4 is an enlarged schematic view at C.

Reference numerals: 1. a valve body; 2. a valve flap; 3. lengthening a pipe; 4. a valve seat; 5. a set screw; 6. a steel ball; 7. a valve stem; 8. a sealing cover; 9. a V-shaped sealing ring; 10. pressing the sleeve; 11. an O-shaped ring; 12. a spring; 13. a compression nut; 14. locking the nut; 15. a connecting flange; 16. a hexagon bolt; 17. a valve cover; 18. a threaded sleeve; 19. a first mounting groove; 20. and a second mounting groove.

Detailed Description

As shown in fig. 1 and 4, a low temperature stop valve comprises a valve body 1, a valve flap 2, a valve rod 7 and a valve cover 17, wherein a fluid passage is arranged in the valve body 1, the upper end of the valve body 1 is fixedly connected with the valve cover 17 through a hexagon bolt 16, one end of the valve flap 2 is matched with a valve seat 4 arranged in an inner cavity of the valve body 1 to form a hard seal with surface-to-surface contact, the other end of the valve flap 2 is connected with one end of the valve rod 7 through a positioning and fixing connecting part, the other end of the valve rod 7 sequentially penetrates through the valve cover 17, an extension pipe 3 and an elastic sealing device and is connected with a driving device, a screw sleeve 18 is arranged between the valve rod 7 and the valve cover 17, the screw sleeve 18 is provided with threads, the upper end of the valve cover 17 is provided with an extension, the valve body 1 and the connecting flanges 15 at the two ends of the valve body 1 are connected by welding, and the central lines of the valve body 1 and the connecting flanges are on the same straight line;

through the arrangement, the upper end of the valve body 1 of the utility model is fixedly connected with the valve cover 17 through the hexagon bolt 16, so that the valve body is more convenient to replace after being damaged; one end of the valve clack 2 is matched with a valve seat 4 arranged in the inner cavity of the valve body 1 to form a hard seal with surface-to-surface contact, so that a medium is not easy to leak when passing through a fluid channel, and the sealing performance is strong; a threaded sleeve 18 is arranged between the valve rod 7 and the valve cover 17, the threaded sleeve 18 is provided with threads, and the threads are matched with the valve rod 7, so that the valve rod 7 is prevented from being seized; the valve body 1 is connected with the connecting flange 15 through welding, so that the flow channel is firmer; the valve body 1 and the connecting flange 15 are on the same straight line, so that when a medium flows through the valve, a straight-through circulation channel is formed, and the medium circulation resistance is greatly reduced.

As shown in fig. 2, the positioning and fixing connection part comprises a steel ball 6, a positioning screw 5, a first mounting groove 19 and a second mounting groove 20, the first mounting groove 19 is arranged on the valve clack 2, the second mounting groove 20 is arranged at one end of the valve rod 7, the first mounting groove 19 is matched with the second mounting groove 20 through the steel ball 6, so that the valve rod 7 is connected with the valve clack 2 in a positioning way, and the valve clack 2 is provided with the positioning screw 5;

through the arrangement, the connecting part is positioned and fixed, so that the valve rod 7 and the valve clack 2 are positioned more accurately, and damage caused by abrasion during up-and-down displacement movement is prevented; valve rod 7 passes through 6 fixed connection of steel ball with valve clack 2 for the cooperation is more nimble and joint strength also promotes greatly, is equipped with set screw 5 on the valve clack 2, makes valve clack 2 more firm with valve rod 7.

As shown in fig. 3, the elastic sealing device includes a spring 12, a V-shaped sealing ring 9, an O-ring 11, a pressing sleeve 10, a sealing cover 8, a pressing nut 13 and a locking nut 14, the sealing cover 8 is fixedly connected with the valve rod 7 through the pressing nut 13 and the locking nut 14, the V-shaped sealing ring 9, the pressing sleeve 10 and the spring 12 are sequentially and upwardly arranged between the sealing cover 8 and the valve rod 7, the spring 12 is sleeved on the pressing sleeve 10, two annular grooves are arranged in the pressing sleeve 10, the two annular grooves are respectively located on one side of the sealing cover 8 and one side of the valve rod 7, and the O-rings 11 are embedded in the two annular grooves;

through the arrangement, the position of the elastic sealing device can be adjusted up and down through the compression nut 13 and the locking nut 14, the sealing cover 8 and the valve rod 7 are compressed through the compression nut 13 and then fixed through the locking nut 14, and the looseness of components in the elastic sealing device can be prevented, so that the service life and the sealing performance of a product are improved, in addition, the compression nut 13 compresses the spring 12 through the rotary locking of the locking nut 14, and the elasticity of the spring 12 is changed according to the compression degree; the V-shaped sealing ring 9, the pressing sleeve 10 and the spring 12 are sequentially arranged upwards between the sealing cover 8 and the valve rod 7 to form multiple sealing, so that the valve rod 7 is not easy to leak and damage during operation, and the pressing sleeve 10 and the V-shaped sealing ring 9 can be prevented from being loosened during the use process of the stop valve, so that the service life and the sealing performance of a product are improved; the spring 12 of the utility model is sleeved on the pressing sleeve 10, has the buffering function, and enhances the pressure resistance and impact resistance of the utility model; two annular grooves are respectively positioned on one side of the sealing cover 8 and one side of the valve rod 7, and O-shaped rings 11 are embedded into the annular grooves, so that the sealing performance between the sealing cover 8 and the pressing sleeve 10 and the sealing performance between the pressing sleeve 10 and the valve rod 7 are improved.

Claims

1. A low-temperature stop valve comprises a valve body (1), a valve clack (2), a valve rod (7) and a valve cover (17), wherein a fluid passage is arranged in the valve body (1), the upper end of the valve body (1) is fixedly connected with the valve cover (17) through a hexagon bolt (16), the low-temperature stop valve is characterized in that one end of the valve clack (2) is matched with a valve seat (4) arranged in an inner cavity of the valve body (1) to form a hard seal with surface-to-surface contact, the other end of the valve clack (2) is connected with one end of the valve rod (7) through a positioning and fixing connecting part, the other end of the valve rod (7) sequentially penetrates through the valve cover (17), an extension pipe (3) and an elastic sealing device and is connected with a driving device, a threaded sleeve (18) is arranged between the valve rod (7) and the valve cover (17), the threaded sleeve (18) is, the upper end of the lengthening pipe (3) is embedded into an elastic sealing device and connected through welding.

2. The low-temperature stop valve according to claim 1, wherein the positioning and fixing connection portion comprises a steel ball (6), a positioning screw (5), a first mounting groove (19) and a second mounting groove (20), the first mounting groove (19) is disposed on the valve flap (2), the second mounting groove (20) is disposed at one end of the valve rod (7), the first mounting groove (19) and the second mounting groove (20) are matched through the steel ball (6), so that the valve rod (7) is in positioning connection with the valve flap (2), and the positioning screw (5) is disposed on the valve flap (2).

3. The cryogenic stop valve according to claim 1, wherein the elastic sealing device comprises a spring (12), a V-shaped sealing ring (9), an O-shaped ring (11), a pressing sleeve (10), a sealing cover (8), a compression nut (13) and a locking nut (14), and the sealing cover (8) is fixedly connected with the valve rod (7) through the compression nut (13) and the locking nut (14).

4. A cryogenic stop valve according to claim 3, wherein the V-shaped sealing ring (9), the pressing sleeve (10) and the spring (12) are sequentially arranged between the sealing cover (8) and the valve rod (7) upwards, and the spring (12) is sleeved on the pressing sleeve (10).

5. Cryogenic stop valve according to claim 4, characterized in that two annular grooves are provided in the pressure sleeve (10), one on the sealing cap (8) side and one on the valve stem (7) side, respectively, wherein an O-ring (11) is embedded in both grooves.

6. The low-temperature stop valve according to claim 1, characterized in that the two ends of the valve body (1) are provided with connecting flanges (15) and are connected by welding, and the center lines of the valve body (1) and the connecting flanges (15) at the two ends of the valve body (1) are on the same straight line.