CN201875146U - Large-caliber high-temperature and high-pressure cutoff valve - Google Patents
Large-caliber high-temperature and high-pressure cutoff valve Download PDFInfo
- Publication number
- CN201875146U CN201875146U CN2010202654411U CN201020265441U CN201875146U CN 201875146 U CN201875146 U CN 201875146U CN 2010202654411 U CN2010202654411 U CN 2010202654411U CN 201020265441 U CN201020265441 U CN 201020265441U CN 201875146 U CN201875146 U CN 201875146U
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- China
- Prior art keywords
- valve
- valve body
- flap
- sealing
- valve rod
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- Expired - Lifetime
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Abstract
The utility model relates to a large ethylene device and particularly discloses a large-caliber high-temperature and high-pressure cutoff valve. A valve flap and a valve stem are arranged in a valve body. A bracket is arranged above the valve body. A manual device is arranged above the bracket. A packing box, a valve stem sealing assembly and an anti-rotation assembly are arranged above the valve flap and outside the valve stem. The lower end of an outlet passage of a middle cavity of the valve body is provided with a secondary throttling structure. When the valve is approximately shut off, the guiding surface of the valve body is coincided with the guiding surface of the valve flap, and the second throttling is formed at the coincided part. Owing to the throttling effect of the secondary throttling structure, the flow quantity of the medium flowing through the sealing surface is small within the short shut on/off time of the valve, the flow speed is decreased, the flushing of the high-speed medium to the sealing surface is weakened, and the service life of the valve is prolonged; the valve stem packing sealing adopts the butterfly spring dynamic sealing, and the spring force provided by a butterfly spring can effectively overcome the looseness of the packing caused by the temperature change and pressure change of the medium; and multiple groups of multi-layer packing assemblies are combined, so that the multi-layer dynamic compensation sealing is realized.
Description
Technical field
The utility model belongs to large-scale ethylene plant, is specifically related to a kind of Y type stop valve.
Background technique
In recent years, along with developing rapidly of China's petrochemical industry, ethylene unit is also more and more with the demand of high-temperature high pressure valve.Flow resistance is low owing to having, negotiability big and long service life for Y type stop valve, is widely used on the ethylene unit.
The effect of Y type stop valve is to cut off the medium that flows in the pipeline.Usually, valve is in the process of closing, and by the throttling of flap sealing surface, control flow rate is until cutting off medium fully.Flap is near to or in contact with sealing surface, and because of throttling action, velocity of medium is the fastest, and medium has sealing surface and washes away, and under high temperature and high pressure condition, it is more serious that sealing surface washes away especially, has influence on the working life of valve.
Summary of the invention
The purpose of this utility model is to provide the heavy-caliber high-temperature high-pressure stop valve of a kind of long service life, good sealing effect.
The technical solution of the utility model is as follows:
A kind of heavy-caliber high-temperature high-pressure stop valve, it comprises and is provided with flap and valve rod in valve body, the valve body, and described valve body top is provided with support, and the support top is provided with manual operating device, is provided with Stuffing box, valve rod sealing assembly and anti-rotation assembly above flap, outside the valve rod.
In above-mentioned heavy-caliber high-temperature high-pressure stop valve: described flap cylindrical guide surface lower end overlaps with valve body inner bore guide surface lower end, makes valve body and flap coincidence place constitute the second throttle platform.
In above-mentioned heavy-caliber high-temperature high-pressure stop valve: described valve rod sealing assembly comprises gland and the pressing plate that is sleeved on outside the valve rod, and double-screw bolt passes pressing plate and is fixed on the Stuffing box, and the double-screw bolt top is provided with butterfly spring and nut.
The beneficial effects of the utility model are: in valve body lumen outlet passage lower end design second throttle structure, when valve when closing, the valve body guide surface overlaps with the flap guide surface, at coincidence place formation second throttle.Because the restriction effect of second throttle structure, in valve opening and short time of closing, MEDIA FLOW reduces through the flow of sealing surface, flow velocity slows down, and has alleviated the high speed medium to the washing away of sealing surface, and has improved the working life of valve; The dynamic seal (packing) of butterfly spring is adopted in stem packing sealing, the spring force that the butterfly spring provides effectively overcome the temperature variation of medium and filler that variation in pressure causes lax, in conjunction with the multi-level filler assembly of many groups, realize that multi-level dynamic compensation seals.
Description of drawings
Fig. 1 is a second throttle structural representation provided by the utility model;
Fig. 2 is a heavy-caliber high-temperature high-pressure stop valve structural representation provided by the utility model;
Fig. 3 is a valve rod sealing assembly structural representation provided by the utility model;
Among the figure: 1. valve body; 2. flap; 3. valve rod; 4. Stuffing box; 5. seal ring; 6. pendant collet; 7. support; 8. valve rod sealing assembly; 9. anti-rotation assembly; 10. manual operating device; 11. cylindrical guide surface lower end; 12. endoporus guide surface lower end; 13. gland; 14. pressing plate; 15. butterfly spring; 16. nut; 17. double-screw bolt.
Embodiment
Below in conjunction with drawings and the specific embodiments the utility model is described in further detail.
As shown in Figure 1, flap 2 in the utility model is processed into cylindrical guide surface 11 in bottom and valve body 1 contacted place, accordingly at valve body 1 interior bottom portion processing endoporus guide surface 12, cylindrical guide surface 11 and endoporus guide surface 12 sizes match, and form coincidence in the outlet passage lower end, therefore constitute the second throttle structure, guarantee that valve is in the short time of opening and closing, allow MEDIA FLOW reduce through the flow of sealing surface, flow velocity slows down, thereby alleviates high speed medium washing away sealing surface.
As shown in Figure 2, at valve body 1 upper fixed support 7, manual operating device 10 is installed in support 7 tops, and valve body 1 inner bottom part is fixed with flap 2, is fixed with valve rod 3 on the flap 2; Outer cover at valve body 1 inside, valve rod 3 is equipped with Stuffing box 4, and Stuffing box 4 is realized installation with valve body 1 by pendant collet 6, the seal ring 5 that Expanded graphite makes also is installed between Stuffing box 4 and valve body 1 seals; Above internal stent, Stuffing box 4, the outside of valve rod 3 also is set with valve rod sealing assembly 8, at the top of valve rod 3 an anti-rotation assembly 9 is installed, and is used for preventing that valve rod 3 from rotating.
Valve rod sealing assembly 8 as shown in Figure 3, valve rod 3 outer suit gland 13 and pressing plates 14, double-screw bolt 17 at first passes butterfly spring 15, passes pressing plate 14 again, is fixed on then on the Stuffing box 4 outside the below valve rod 3, and is fixing with nut 16 again.Can adopt 2 double-screw bolts 17 to carry out the fixing of valve rod sealing assembly 8 respectively.Like this, 15 dynamic seal (packing)s of butterfly spring are adopted in stem packing sealing, the spring force that butterfly spring 15 provides effectively overcome the temperature variation of medium and filler that variation in pressure causes lax, in conjunction with the multi-level filler assembly of many groups, realize that multi-level dynamic compensation seals.
The lumen of valve body 1 can adopt fine finishing, and flap 2 can adopt global design, and flap 2 is processed by whole block material, along valve body 1 omnidistance guiding, and guide surface built-up welding STL6, wear resistance is good; After valve body 1, flap 2 fine finishing, the guiding clearance of strict control flap 2 and valve body 1 prevents flap 2 jam at the volley.
Claims (3)
1. heavy-caliber high-temperature high-pressure stop valve, it comprises and is provided with flap (2) and valve rod (3) in valve body (1), the valve body (1), it is characterized in that: described valve body (1) top is provided with support (7), support (7) top is provided with manual operating device (10), is provided with Stuffing box (4), valve rod sealing assembly (8) and anti-rotation assembly (9) outside flap (2) top, valve rod (3).
2. heavy-caliber high-temperature high-pressure stop valve as claimed in claim 1, it is characterized in that: described flap (2) cylindrical guide surface lower end (11) overlaps with valve body (1) endoporus guide surface lower end (12), makes valve body (1) and flap (2) coincidence place constitute the second throttle platform.
3. heavy-caliber high-temperature high-pressure stop valve as claimed in claim 1 or 2, it is characterized in that: described valve rod sealing assembly (8) comprises gland (13) and the pressing plate (14) that is sleeved on outside the valve rod (7), double-screw bolt (17) passes pressing plate (14) and is fixed on the Stuffing box (4), and double-screw bolt (17) top is provided with butterfly spring (15) and nut (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202654411U CN201875146U (en) | 2010-07-21 | 2010-07-21 | Large-caliber high-temperature and high-pressure cutoff valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202654411U CN201875146U (en) | 2010-07-21 | 2010-07-21 | Large-caliber high-temperature and high-pressure cutoff valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201875146U true CN201875146U (en) | 2011-06-22 |
Family
ID=44163063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202654411U Expired - Lifetime CN201875146U (en) | 2010-07-21 | 2010-07-21 | Large-caliber high-temperature and high-pressure cutoff valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201875146U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102563087A (en) * | 2010-12-24 | 2012-07-11 | 中核苏阀科技实业股份有限公司 | Y-shaped stop valve |
-
2010
- 2010-07-21 CN CN2010202654411U patent/CN201875146U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102563087A (en) * | 2010-12-24 | 2012-07-11 | 中核苏阀科技实业股份有限公司 | Y-shaped stop valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110622 |
|
| CX01 | Expiry of patent term |