CN203571134U - Plastic sealing pilot operated safety valve - Google Patents
Plastic sealing pilot operated safety valve Download PDFInfo
- Publication number
- CN203571134U CN203571134U CN201320607330.8U CN201320607330U CN203571134U CN 203571134 U CN203571134 U CN 203571134U CN 201320607330 U CN201320607330 U CN 201320607330U CN 203571134 U CN203571134 U CN 203571134U
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- valve
- pilot
- main valve
- diaphragm
- pilot valve
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Abstract
The utility model relates to the technical field of overpressure protection pilot operated safety valves of pressure systems and particularly discloses a plastic sealing pilot operated safety valve. In the safety valve, a main valve guide sleeve is arranged in a main valve shell, and a main valve clack matched with the main valve guide sleeve is arranged in the main valve guide sleeve. A plastic clamping sleeve is arranged in an annular gap between the main valve clack and the main valve guide sleeve. The plastic clamping sleeve is fixed to the main valve clack, a pre-compression spring is arranged in the plastic clamping sleeve to stretch the plastic clamping sleeve so that the plastic clamping sleeve can be tightly attached to the inner wall of the main valve guide sleeve, and sliding sealing between the main valve guide sleeve and the main valve clack is achieved. A pilot valve is fixed to the upper end of a main valve and connected with a main valve inlet, a main valve gas chamber and a main valve outlet respectively through pressure pipes. A plastic sealing structure which replaces a traditional rubber sealing structure is adopted in the safety valve so that the safety valve can tolerate environments with more rigorous working conditions, in addition, performances can be adjusted through a pilot valve adjusting mechanism, and therefore the requirement for adjusting the corrosion-resisting performance, the discharging performance and the motion performance of the safety valve can be met.
Description
Technical field
The invention belongs to the Pilot operated safety valve technical field of pressure system overpressure protection, be specifically related to a kind of plastic seal Pilot operated safety valve.
Background technique
Pilot operated safety valve is a kind of non-direct-operated relief valve, a main valve and pilot valve, consists of, and relies on pilot valve discharge medium to drive or controls main valve and open.On market, common Pilot operated safety valve is pop type and modulation type guide safety valve, this two classes Pilot operated safety valve in a large amount of use of motive sealing and static seal position rubber o-ring, because the anti-corrosion capacity of rubber o-ring and tolerable temperature is limited in one's ability, limited greatly the use of Pilot operated safety valve in special media environment.
Domestic petroleum, petrochemical industry development at present rapidly, many large scale chemical plants, as PX(paraxylene) device, PTA(p-phthalic acid) device etc. all require use Pilot operated safety valve, and due to the particularity of operating mode, the pilot valve of rubber seal cannot meet the demands, and therefore market in urgent need design is a kind of does not use Pilot operated safety valve that rubber o-ring seals to meet harsher medium tolerance requirement.
Due to the particular principles of Pilot operated safety valve, be to rely on the action of pilot valve to control the opening and closing of main valve, thereby relative main valve, the structure of pilot valve is very compact; Rubber has good extensibility and rebound elasticity, and traditional sealing adopts rubber o-ring can meet the designing requirement of pilot valve; If employing plastic material, the rebound elasticity of plastics is poor, and seal pressure is larger, the more difficult realization of existing structure.
Because although traditional modulation type pilot valve modulating characteristic is remarkable, the Lift that can realize main valve changes with superpressure numerical values recited, according to system, the actual demand of overpressure protection is regulated to discharge capacity, environmental protection and energy-conservation, but do not have pilot valve regulation structure causative action performance non-adjustable, although it is adjustable that pop type pilot valve has controlling mechanism performance, but there is no modulating characteristic, one superpressure just reaches delivery, the medium amount of its actual discharge can be greater than the needed overpressure relief amount of system, therefore newly-designed pilot valve also will have the advantage of modulation type and pop type pilot valve concurrently, there is sensitive controlling mechanism, make discharge capacity and the performance of this valve all adjustable, meet the different demands of different clients to emission performance and performance.
In the main valve of Pilot operated safety valve, between flap and guide pin bushing, there is slipper seal, conventional rubber o-ring sealing can realize the sealing between guide pin bushing and flap, can guarantee again the axial motion between guide pin bushing and flap, if employing plastic seal, because plastics rebound elasticity is poor, radial seal specific pressure is less, cannot make radial seal between guide pin bushing and flap, therefore slipper seal is also a great problem facing.
Summary of the invention
The object of the present invention is to provide a kind of plastic seal Pilot operated safety valve, it can realize emission performance and performance is adjustable, both the demand of client to tolerance special media Pilot operated safety valve can be met, the different demands of client to discharge capacity and performance can be met again.
Technological scheme of the present invention is as follows: a kind of plastic seal Pilot operated safety valve, comprise main valve and pilot valve, wherein, in main valve housing, be provided with main valve guide pin bushing, and in main valve guide pin bushing, be provided with the main valve flap matching with it, in annular space between main valve flap and main valve guide pin bushing, be provided with plastics chuck, plastics chuck is fixed on main valve flap, and in plastics chuck, built-in precompressed spring struts plastic clip cover, it is close on main valve guide pin bushing inwall, has realized the slipper seal between main valve guide pin bushing and main valve flap; Pilot valve is fixed on the upper end of main valve, and pilot valve is exported and is connected with main valve entrance, main valve air chamber and main valve respectively by pressure tube.
Described pilot valve comprises pilot valve valve gap, valve shaft, pilot valve valve body and pilot valve seat, and wherein, pilot valve valve gap is fixed together with upper diaphragm, middle trim ring, lower diaphragm and pilot valve valve body successively by bolt; On the upper diaphragm of pilot valve valve gap enclosure interior, be furnished with upper diaphragm briquetting, between upper diaphragm and lower diaphragm, be furnished with lower diaphragm follower, through the valve shaft of pilot valve seat center hole, its upper end is successively through lower diaphragm, lower diaphragm follower, upper diaphragm and upper diaphragm briquetting, and pass through locking nut, upper diaphragm briquetting, upper diaphragm, lower diaphragm follower and lower diaphragm are fixed on valve shaft, in the pilot valve valve body central hole that is positioned at valve shaft lower end, be provided with pilot valve seat, and by the fixing valve shaft plastic seal piece in valve shaft lower end, realize the sealing to pilot valve seat.
Between described upper diaphragm, middle trim ring, lower diaphragm follower and lower diaphragm, form upper diaphragm chamber; Diaphragm chamber under forming between lower diaphragm and pilot valve valve body; Regulating nail is arranged in pilot valve valve body by worm structure, and regulating nail is by the throttle orifice adjustable with forming size coordinating of pilot valve valve body.
Described main valve entrance directly communicates with lower diaphragm chamber, main valve air chamber, and main valve entrance communicates by upper diaphragm pressure tube with upper diaphragm chamber, and main valve inlet fluid enters main valve air chamber and upper diaphragm chamber through the throttle orifice of pilot valve valve body and regulating nail composition.
Between described upper diaphragm and middle trim ring, by pad C, seal, between middle trim ring and lower diaphragm, by pad B, seal, between lower diaphragm and pilot valve valve body, by pad A, seal.
The stupefied pilot valve spring that is provided with of ladder of the upper diaphragm briquetting upper end in described pilot valve valve gap, and in the upper end of pilot valve spring, pilot valve upper spring seat is installed, adjust the tapped hole of screw through pilot valve valve gap upper end, top is pressed on pilot valve upper spring seat, by adjusting screw top, press pilot valve upper spring seat, the compression pilot valve spring of pilot valve spring also acts directly on upper diaphragm briquetting.
The upper end of described pilot valve valve gap has also been threaded connection bonnet.
Described pilot valve valve gap is the shell construction of lower end with flange, and its lower end flange is fixed together with upper diaphragm, middle trim ring, lower diaphragm and pilot valve valve body successively by bolt.
Remarkable result of the present invention is: in a kind of plastic seal Pilot operated safety valve of the present invention, adopt plastic seal structure to replace traditional rubber sealing structure, not only can tolerate harsher work condition environment, can also to performance, regulate by pilot valve controlling mechanism, meet decay resistance and emission performance and the adjustable demand of performance to Pilot operated safety valve.
Accompanying drawing explanation
Fig. 1 is a kind of plastic seal Pilot operated safety valve structural representation of the present invention;
Fig. 2 is A place partial enlarged drawing in Fig. 1;
Fig. 3 is pilot valve place structure connection diagram in Fig. 1
Fig. 4 is pilot valve structure schematic diagram in Fig. 1;
Fig. 5 is A-A sectional view in Fig. 3;
In figure: 1, main valve; 2, pilot valve; 3, main valve guide pin bushing; 4, main valve flap; 5, plastics chuck; 6, spring; 7, adjust screw; 8, pilot valve valve gap; 9, pilot valve upper spring seat; 10, pilot valve spring; 11, valve shaft; 12, upper diaphragm briquetting; 13, upper diaphragm; 14, lower diaphragm follower; 15, lower diaphragm; 16, pilot valve valve body; 17, pilot valve seat; 18, regulating nail; 19, pilot valve seat plastic seal piece; 20, pad A; 21, pad B, 22, middle trim ring; 23, pad C, 24, bolt; 25, locking nut; 26, bonnet; 27, upper diaphragm cavity pressure pipe; 28, valve shaft plastic seal piece; 29, main valve air chamber; 30, upper diaphragm chamber; 31, lower diaphragm chamber.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in Fig. 1～5, a kind of plastic seal Pilot operated safety valve, comprise main valve 1 and pilot valve 2, wherein, it is the main valve guide pin bushing 3 of cylindrical drum wall construction that inwall is installed in main valve 1 housing, and in main valve guide pin bushing 3, be furnished with the main valve flap 4 matching with it, and be furnished with plastics chuck 5 in the annular space between main valve flap 4 and main valve guide pin bushing 3, plastics chuck 5 is fixed on main valve flap 4, and in plastics chuck 5, built-in precompressed spring 6 struts plastics chuck 5, it is close on main valve guide pin bushing 3 inwalls, realized the slipper seal between main valve guide pin bushing 3 and main valve flap 4, pilot valve 2 is fixed on the upper end of main valve 1, and pilot valve 2 is exported and is connected with main valve entrance, main valve air chamber 29 and main valve respectively by pressure tube, pilot valve 2 comprises pilot valve valve gap 8, valve shaft 11, pilot valve valve body 16 and pilot valve seat 17, wherein, pilot valve valve gap 8 is the shell construction of lower end with flange, its lower end flange is fixed together with upper diaphragm 13, middle trim ring 22, lower diaphragm 15 and pilot valve valve body 16 successively by bolt 24, and by pad C23, seal between upper diaphragm 13 and middle trim ring 22, between middle trim ring 22 and lower diaphragm 15, by pad B21, seal, between lower diaphragm 15 and pilot valve valve body 16, by pad A20, seal, on the upper diaphragm 13 of pilot valve valve gap 8 enclosure interior, be furnished with upper diaphragm briquetting 12, between upper diaphragm 13 and lower diaphragm 15, be furnished with lower diaphragm follower 14, through the valve shaft 11 of pilot valve seat 17 center holes, its upper end is successively through lower diaphragm 15, lower diaphragm follower 14, upper diaphragm 13 and upper diaphragm briquetting 12, and by locking nut 25, by upper diaphragm briquetting 12, upper diaphragm 13, lower diaphragm follower 14 and lower diaphragm 15 are fixed on valve shaft 11, wherein, on the lower end surface of valve shaft 11, be stained with pilot valve seat plastic seal piece 19, and valve shaft 11 seals by valve shaft plastic seal piece 28 and pilot valve valve body 16, in pilot valve valve body 16 central hole that are positioned at valve shaft 11 lower ends, by screw thread, be installed with pilot valve seat 17, by the valve shaft plastic seal piece 28 of valve shaft 11 lower ends, can realize the sealing to pilot valve seat 17, on the ladder of upper diaphragm briquetting 12 upper ends in pilot valve valve gap 8 is stupefied, be furnished with pilot valve spring 10, and in the upper end of pilot valve spring 10, pilot valve upper spring seat 9 is installed, adjust the tapped hole of screw 7 through pilot valve valve gap 8 upper ends, top is pressed on pilot valve upper spring seat 9, by adjusting screw 7 tops, press pilot valve upper spring seat 9, the compression pilot valve spring 10 of pilot valve spring 10 also acts directly on upper diaphragm briquetting 12, in the upper end of pilot valve valve gap 8, has also been threaded connection bonnet 26.
In pilot valve 2, between upper diaphragm 13, middle trim ring 19, lower diaphragm follower 14 and lower diaphragm 15, form upper diaphragm chamber 30; Diaphragm chamber 31 under forming between lower diaphragm 15 and pilot valve valve body 16; Regulating nail 18 is arranged in pilot valve valve body 16 by worm structure, and regulating nail 18 is by the throttle orifice adjustable with forming size coordinating of pilot valve valve body 16; Main valve entrance directly communicates with lower diaphragm chamber 31, main valve air chamber 29, main valve entrance communicates by upper diaphragm pressure tube 27 with upper diaphragm chamber 30, and the throttle orifice that main valve inlet fluid need to form through pilot valve valve body 16 and regulating nail 18 enters main valve air chamber 29 and upper diaphragm chamber 30;
When system pressure is during lower than the Set pressure of valve, pilot valve seat hermetically closing, system pressure enters diaphragm chamber 31 and main valve air chamber 29 under pilot valve upper diaphragm chamber 30 and pilot valve by main valve entrance through pilot valve 2, and the interior gas of main valve air chamber 29 acts on main valve flap, makes main valve 1 keep closing.
When system pressure increase reaches Set pressure, the spring force that upper diaphragm 13 overcomes pilot valve spring 10 under the effect of pressure moves upward, upper diaphragm 13 drives valve shaft 11 to make pilot valve seat plastic seal piece 19 leave pilot valve seat 17, the pressure in the part of releasing main valve air chamber 29 and upper diaphragm chamber 30.A part because upper diaphragm chamber 30 gases have been released, lower diaphragm chamber 31 pressure are higher than upper diaphragm chamber 30 pressure, under pressure official post between lower diaphragm chamber 31 and upper diaphragm chamber 30, diaphragm 15 is subject to power upwards, and lower diaphragm 15 drives valve shaft 11 further to increase the Lift of pilot valve seat plastic seal piece 19.Main valve air chamber 29 inner fluids export to main valve by the spatial flow between pilot valve seat plastic seal piece 19 and pilot valve seat 17, main valve air chamber 29 pressure constantly reduce, equilibrium of forces state is constantly revised, and makes main valve flap 4 move to accurate height, and keeps stable emissions status.When system pressure reaches discharge pressure, main valve flap 4 reaches standard-sized sheet, realizes delivery.
Regulating nail 18 is by the throttle orifice adjustable with forming size coordinating of pilot valve valve body 16, the speed that enters upper diaphragm chamber 30 by controlling main valve inlet fluid to the adjusting of regulating nail 18, the speed that fluid enters upper diaphragm chamber 30 determines the pressure difference between lower diaphragm chamber 31 and upper diaphragm chamber 30, pressure extent has directly determined the size of pilot valve cracking pressure, the size of pilot valve cracking pressure has determined again the Lift of pilot valve, so can be realized pilot valve seat plastic seal piece 19 is opened to high control by regulating nail 18.
The adjustment hole of pilot valve is larger, when pilot valve is soon opened, it is less that main valve inlet fluid enters pressure difference between lower diaphragm chamber 31 and upper diaphragm chamber 30, the opening force of pilot valve is less, the Lift of pilot valve is less, it is slower that main valve air chamber 29 pressure will be released, it is just slower that main valve flap upwardly opens, the Lift that can realize main valve changes with superpressure numerical values recited, according to system, the actual demand of overpressure protection is regulated to discharge capacity, thereby modulating performance is remarkable, in addition, because the Lift of pilot valve is less, be more conducive to pilot valve and return seat, also can cause the variation of pilot valve performance, Reseating pressure of a safety valve can improve.Otherwise, it is less that pilot valve adjustment hole regulates, when pilot valve is soon opened, it is larger that main valve inlet fluid enters pressure difference between lower diaphragm chamber 31 and upper diaphragm chamber 30, the opening force of pilot valve is larger, the Lift of pilot valve is larger, it is very fast that main valve air chamber 29 pressure will be released, it is just faster that main valve flap upwardly opens, thereby main valve has just been issued to full open in very little superpressure, and modulating performance is not remarkable, in addition, because the Lift of pilot valve is larger, do not utilize the seat that returns of pilot valve, Reseating pressure of a safety valve can reduce; Therefore the pressure difference that changes two diaphragm chambers by pilot valve regulating nail, has realized the adjusting of emission performance and performance.
When system pressure reduces, lower diaphragm chamber 31 pressure decreaseds, pressure difference between lower diaphragm chamber 31 and upper diaphragm chamber 30 disappears, the suffered power upwards of lower diaphragm 15 disappears, under 10 effects of pilot valve spring, pilot valve seat sealing block 19 seals with pilot valve seat 17, system pressure enters main valve air chamber 29, and main valve is closed.
Claims (8)
1. a plastic seal Pilot operated safety valve, comprise main valve (1) and pilot valve (2), wherein, in main valve (1) housing, be provided with main valve guide pin bushing (3), and in main valve guide pin bushing (3), be provided with the main valve flap (4) matching with it, it is characterized in that: in the annular space between main valve flap (4) and main valve guide pin bushing (3), be provided with plastics chuck (5), plastics chuck (5) is fixed on main valve flap (4), and in plastics chuck (5), built-in precompressed spring (6) struts plastics chuck (5), it is close on main valve guide pin bushing (3) inwall, realized the slipper seal between main valve guide pin bushing (3) and main valve flap (4), pilot valve (2) is fixed on the upper end of main valve (1), and pilot valve (2) is exported and is connected with main valve entrance, main valve air chamber (29) and main valve respectively by pressure tube.
2. a kind of plastic seal Pilot operated safety valve according to claim 1, it is characterized in that: described pilot valve (2) comprises pilot valve valve gap (8), valve shaft (11), pilot valve valve body (16) and pilot valve seat (17), wherein, pilot valve valve gap (8) is fixed together with upper diaphragm (13), middle trim ring (22), lower diaphragm (15) and pilot valve valve body (16) successively by bolt (24), on the upper diaphragm (13) of pilot valve valve gap (8) enclosure interior, be furnished with upper diaphragm briquetting (12), between upper diaphragm (13) and lower diaphragm (15), be furnished with lower diaphragm follower (14), through the valve shaft (11) of pilot valve seat (17) center hole, its upper end is successively through lower diaphragm (15), lower diaphragm follower (14), upper diaphragm (13) and upper diaphragm briquetting (12), and by locking nut (25), by upper diaphragm briquetting (12), upper diaphragm (13), lower diaphragm follower (14) and lower diaphragm (15) are fixed on valve shaft (11), in pilot valve valve body (16) central hole that is positioned at valve shaft (11) lower end, be provided with pilot valve seat (17), and by the fixing valve shaft plastic seal piece (28) in valve shaft (11) lower end, the sealing of realization to pilot valve seat (17).
3. a kind of plastic seal Pilot operated safety valve according to claim 2, is characterized in that: between described upper diaphragm (13), middle trim ring (19), lower diaphragm follower (14) and lower diaphragm (15), form upper diaphragm chamber; Diaphragm chamber (31) under forming between lower diaphragm (15) and pilot valve valve body (16); Regulating nail (18) is arranged in pilot valve valve body (16) by worm structure, and regulating nail (18) is by the throttle orifice adjustable with forming size coordinating of pilot valve valve body (16).
4. a kind of plastic seal Pilot operated safety valve according to claim 3, it is characterized in that: described main valve entrance directly communicates with lower diaphragm chamber (31), main valve air chamber (29), main valve entrance communicates by upper diaphragm pressure tube (27) with upper diaphragm chamber (30), and main valve inlet fluid enters main valve air chamber (29) and upper diaphragm chamber (30) through pilot valve valve body (16) and the throttle orifice of regulating nail (18) composition.
5. a kind of plastic seal Pilot operated safety valve according to claim 2, it is characterized in that: between described upper diaphragm (13) and middle trim ring (22), pass through pad C(23) sealing, between middle trim ring (22) and lower diaphragm (15), pass through pad B(21) sealing, between lower diaphragm (15) and pilot valve valve body (16), pass through pad A(20) sealing.
6. a kind of plastic seal Pilot operated safety valve according to claim 2, it is characterized in that: the stupefied pilot valve spring (10) that is provided with of ladder of upper diaphragm briquetting (12) upper end in described pilot valve valve gap (8), and in the upper end of pilot valve spring (10), pilot valve upper spring seat (9) is installed, adjust the tapped hole of screw (7) through pilot valve valve gap (8) upper end, top is pressed on pilot valve upper spring seat (9), by adjusting screw (7) top, press pilot valve upper spring seat (9), the compression pilot valve spring (10) of pilot valve spring (10) also acts directly on upper diaphragm briquetting (12).
7. according to any one plastic seal Pilot operated safety valve described in claim 2～6, it is characterized in that: the upper end of described pilot valve valve gap (8) has also been threaded connection bonnet (26).
8. according to any one plastic seal Pilot operated safety valve described in claim 2～6, it is characterized in that: described pilot valve valve gap (8) is for lower end is with the shell construction of flange, and its lower end flange is fixed together with upper diaphragm (13), middle trim ring (22), lower diaphragm (15) and pilot valve valve body (16) successively by bolt (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320607330.8U CN203571134U (en) | 2013-09-29 | 2013-09-29 | Plastic sealing pilot operated safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320607330.8U CN203571134U (en) | 2013-09-29 | 2013-09-29 | Plastic sealing pilot operated safety valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203571134U true CN203571134U (en) | 2014-04-30 |
Family
ID=50538866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320607330.8U Expired - Lifetime CN203571134U (en) | 2013-09-29 | 2013-09-29 | Plastic sealing pilot operated safety valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203571134U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104514901A (en) * | 2013-09-29 | 2015-04-15 | 北京航天动力研究所 | Plastic sealing type 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 |
-
2013
- 2013-09-29 CN CN201320607330.8U patent/CN203571134U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104514901A (en) * | 2013-09-29 | 2015-04-15 | 北京航天动力研究所 | Plastic sealing type pilot-operated safety valve |
| CN104514901B (en) * | 2013-09-29 | 2017-07-18 | 北京航天石化技术装备工程有限公司 | A kind of plastic seal 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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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140430 |
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| CX01 | Expiry of patent term |