CN203730856U - Vacuum-backflow preventive pilot safety valve - Google Patents
Vacuum-backflow preventive pilot safety valve Download PDFInfo
- Publication number
- CN203730856U CN203730856U CN201420073662.7U CN201420073662U CN203730856U CN 203730856 U CN203730856 U CN 203730856U CN 201420073662 U CN201420073662 U CN 201420073662U CN 203730856 U CN203730856 U CN 203730856U
- Authority
- CN
- China
- Prior art keywords
- valve
- sealing seat
- flap
- control
- pilot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000003449 preventive effect Effects 0.000 title abstract 6
- 238000007789 sealing Methods 0.000 claims abstract description 63
- 230000008676 import Effects 0.000 claims description 12
- 230000000694 effects Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Abstract
The utility model relates to a vacuum-backflow preventive pilot safety valve which comprises a main valve and a pilot valve. The vacuum-backflow preventive pilot safety valve is mainly characterized in that a backflow preventive controller is arranged between an upper cavity of a valve clack of the main valve and a control port of the pilot valve and comprises a three-way control valve, a control valve clack, a left sealing seat and a right sealing seat, the left sealing seat and the right sealing seat are respectively mounted in a left channel and a right channel of the three-way control valve, the control valve clack is mounted in a channel between the left sealing seat and the right sealing seat, an inner hole of the left sealing seat is communicated with the atmosphere, an inner hole of the right sealing seat is communicated with the control port of the pilot valve, a middle channel of the three-way control valve is communicated with the upper cavity of the valve clack, a spring hole is formed in the center of the right end surface of the control valve clack, and a control spring is mounted between the spring hole and a convex shoulder of the inner hole of the right sealing seat. The vacuum-backflow preventive pilot safety valve has the advantages that when a negative pressure is generated at an inlet of the main valve, the control valve clack can be sucked to the right side of the inlet of the main valve by the negative pressure and is in seal fit with the right sealing seat, so that the negative pressure of a channel of the inlet of the main valve can be prevented from being transmitted into the upper cavity of the valve clack, backflow of media at an outlet of the main valve can be prevented, the safety of systems and equipment can be reliably protected, and the vacuum-backflow preventive pilot safety valve is reliable in protection performance.
Description
Technical field
The utility model relates to valve field, especially relates to a kind of Pilot operated safety valve.
Background technique
Pilot operated safety valve is generally made up of pilot valve and main valve, pilot valve import is communicated with main valve import, pilot valve outlet is connected with main valve flap epicoele, in the time that pilot valve is not opened, identical pressure medium bears with main valve flap epicoele in main valve inlet, in the time that pressure medium is elevated to Set pressure value, pilot valve is opened, the main valve flap epicoele medium of releasing, main valve flap rises and opens, when pressure medium drops to Reseating pressure of a safety valve value, pilot valve cuts out, main valve import medium is got back to again main valve flap epicoele, main valve flap declines and closes, main valve inlet pressure is controlled in Set pressure, protective system safety.Its shortcoming is: when negative pressure appears in main valve suction side pressure medium, and during lower than its outlet port pressure medium, main valve flap epicoele also there will be negative pressure operating mode, main valve flap is under the effect of outlet side pressure medium, main valve flap rises and opens, the medium in main valve outlet port can flow back to main valve suction side, forms the phenomenon flowing backwards, and affects the safety of equipment.
Summary of the invention
The purpose of this utility model is the defect existing for prior art, and a kind of anti-vacuum back-flow Pilot operated safety valve that has negative pressure protection, prevents medium negative pressure refluence is provided.
The technical solution of the utility model comprises main valve, pilot valve, main valve comprises valve body, flap, guide sleeve, valve gap, body cavity is provided with the valve seat insert being sealed and matched with flap, between flap, guide sleeve and valve gap, form flap epicoele, mounting spring in this flap epicoele, pilot valve import is communicated with main valve import, and flap epicoele is communicated with pilot valve control mouth, mainly to be provided with anti-backflow controller between flap epicoele and pilot valve control mouth, this anti-backflow controller comprises three-way control valve body, control flap, left sealing seat, right sealing seat, left sealing seat and right sealing seat are arranged on respectively in the left and right passage of three-way control valve body, controlling flap is arranged in the passage between left sealing seat and right sealing seat, two of the left and right end face of controlling flap is shaped with respectively and left sealing seat, the sealing surface that right sealing seat cooperatively interacts, the endoporus of left sealing seat is communicated with atmosphere, the endoporus of right sealing seat is communicated with pilot valve control mouth, the center-aisle of three-way control valve body is communicated with flap epicoele, control center, flap right side and be shaped with spring eye, between this spring eye and right sealing seat endoporus convex shoulder, control spring is installed, in the time controlling flap and left sealing seat and be sealed and matched, control the left side that flap right side sealing surface is positioned at three-way control valve body center-aisle.
In above technological scheme, in the time controlling flap and right sealing seat and be sealed and matched, control sealing surface on the left of flap and be positioned at the right side of three-way control valve body center-aisle.
The flap epicoele that the utility model has the advantages that main valve is communicated with pilot valve control mouth by anti-backflow controller; in the time there is negative pressure in main valve import; negative pressure is drawn onto the right by control flap and is sealed and matched with right sealing seat; stop the negative pressure of main valve inlet passage to enter flap epicoele; prevent that main valve outlet medium from flowing backwards, protective system device security reliably.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Embodiment
Anti-vacuum back-flow Pilot operated safety valve as shown in Figure 1, comprise main valve, pilot valve 11, main valve comprises valve body 1, flap 2, guide sleeve 3, valve gap 4, guide sleeve 3 upper end sealings are arranged between valve body 1 and valve gap 4, guide sleeve 3 inner hole walls coordinate with flap 2 peripheries are moving, valve body 1 inner chamber is provided with the valve seat insert being sealed and matched with flap 2, between flap 2, guide sleeve 3 and valve gap 4, form flap epicoele, mounting spring 5 in this flap epicoele, pilot valve 11 imports are communicated with main valve import, and flap epicoele is controlled mouth with pilot valve 11 and is communicated with, between flap epicoele and pilot valve 11 control mouths, be provided with anti-backflow controller, this anti-backflow controller comprises three-way control valve body 7, control flap 8, left sealing seat 6, right sealing seat 10, left sealing seat 6 and right sealing seat 10 are arranged on respectively in the left and right passage of three-way control valve body 7, controlling flap 8 is arranged in the passage between left sealing seat 6 and right sealing seat 10, two of the left and right end face of controlling flap 8 is shaped with respectively and left sealing seat 6, the sealing surface that right sealing seat 10 cooperatively interacts, the endoporus of left sealing seat 6 is communicated with atmosphere, the endoporus of right sealing seat 10 is controlled mouth with pilot valve 11 and is communicated with, the center-aisle of three-way control valve body 7 is communicated with flap epicoele, control flap 8 centers, right side and be shaped with spring eye, between this spring eye and right sealing seat 10 endoporus convex shoulders, control spring 9 is installed, in the time of main valve import medium positive pressure, controlling flap 8 is sealed and matched in control spring 9 elastic force effects and left sealing seat 6, in the time that control flap 8 is sealed and matched with left sealing seat 6, control the left side that flap 8 right side sealing surfaces are positioned at three-way control valve body 6 center-aisles, making flap epicoele and pilot valve 11 control mouth is communicated with.
In the time that negative pressure appears in main valve import, this negative pressure will overcome the elastic force of control spring 9, inhales brake control valve lobe 8 and is sealed and matched with right sealing seat 10.In the time that control flap 8 is sealed and matched with right sealing seat 10, control flap 8 left side sealing surfaces are positioned at the right side of three-way control valve body 7 center-aisles, and flap epicoele is communicated with atmosphere by left sealing seat 6.Control two of 8 left and right of flap end face seal ring is installed respectively.
Claims (2)
1. an anti-vacuum back-flow Pilot operated safety valve, comprise main valve, pilot valve (11), main valve comprises valve body (1), flap (2), guide sleeve (3), valve gap (4), valve body (1) inner chamber is provided with the valve seat insert being sealed and matched with flap (2), between flap (2), guide sleeve (3) and valve gap (4), form flap epicoele, mounting spring (5) in this flap epicoele, pilot valve (11) import is communicated with main valve import, and flap epicoele is controlled mouth with pilot valve (11) and is communicated with, it is characterized in that being provided with anti-backflow controller between flap epicoele and pilot valve (11) control mouth, this anti-backflow controller comprises three-way control valve body (7), control flap (8), left sealing seat (6), right sealing seat (10), left sealing seat (6) and right sealing seat (10) are arranged on respectively in the left and right passage of three-way control valve body (7), controlling flap (8) is arranged in the passage between left sealing seat (6) and right sealing seat (10), two of the left and right end face of controlling flap (8) is shaped with respectively and left sealing seat (6), the sealing surface that right sealing seat (10) cooperatively interacts, the endoporus of left sealing seat (6) is communicated with atmosphere, the endoporus of right sealing seat (10) is controlled mouth with pilot valve (11) and is communicated with, the center-aisle of three-way control valve body (7) is communicated with flap epicoele, control flap (8) center, right side and be shaped with spring eye, between this spring eye and right sealing seat (10) endoporus convex shoulder, control spring (9) is installed, in the time that control flap (8) and left sealing seat (6) are sealed and matched, control the left side that flap (8) right side sealing surface is positioned at three-way control valve body (6) center-aisle.
2. anti-vacuum back-flow Pilot operated safety valve according to claim 1, it is characterized in that in the time that control flap (8) and right sealing seat (10) are sealed and matched, control flap (8) left side sealing surface is positioned at the right side of three-way control valve body (7) center-aisle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420073662.7U CN203730856U (en) | 2014-02-18 | 2014-02-18 | Vacuum-backflow preventive pilot safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420073662.7U CN203730856U (en) | 2014-02-18 | 2014-02-18 | Vacuum-backflow preventive pilot safety valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203730856U true CN203730856U (en) | 2014-07-23 |
Family
ID=51200931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420073662.7U Expired - Lifetime CN203730856U (en) | 2014-02-18 | 2014-02-18 | Vacuum-backflow preventive pilot safety valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203730856U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103851238A (en) * | 2014-02-18 | 2014-06-11 | 永一阀门集团有限公司 | Vacuum backflow prevention pilot operated safety valve |
| CN104235478A (en) * | 2014-09-10 | 2014-12-24 | 永一阀门集团有限公司 | Impulse safety valve |
| CN105864496A (en) * | 2016-05-27 | 2016-08-17 | 永阀门集团有限公司 | Backpressure-adjusting pilot operated safety valve |
| CN112815123A (en) * | 2020-12-30 | 2021-05-18 | 天正阀门有限公司 | Ultra-low temperature bellows pilot operated safety valve |
-
2014
- 2014-02-18 CN CN201420073662.7U patent/CN203730856U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103851238A (en) * | 2014-02-18 | 2014-06-11 | 永一阀门集团有限公司 | Vacuum backflow prevention pilot operated safety valve |
| CN104235478A (en) * | 2014-09-10 | 2014-12-24 | 永一阀门集团有限公司 | Impulse safety valve |
| CN104235478B (en) * | 2014-09-10 | 2016-08-24 | 永一阀门集团有限公司 | Momentum safety valve |
| CN105864496A (en) * | 2016-05-27 | 2016-08-17 | 永阀门集团有限公司 | Backpressure-adjusting pilot operated safety valve |
| CN112815123A (en) * | 2020-12-30 | 2021-05-18 | 天正阀门有限公司 | Ultra-low temperature bellows pilot operated safety 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: 20140723 |
|
| CX01 | Expiry of patent term |