CN1027918C - Leading operated safety valve with single ball and double insurance - Google Patents
Leading operated safety valve with single ball and double insurance Download PDFInfo
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- CN1027918C CN1027918C CN 87108297 CN87108297A CN1027918C CN 1027918 C CN1027918 C CN 1027918C CN 87108297 CN87108297 CN 87108297 CN 87108297 A CN87108297 A CN 87108297A CN 1027918 C CN1027918 C CN 1027918C
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- 230000007246 mechanism Effects 0.000 claims abstract description 39
- 238000007789 sealing Methods 0.000 claims description 71
- 230000000694 effects Effects 0.000 claims description 24
- 230000004888 barrier function Effects 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000009471 action Effects 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 238000007599 discharging Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Abstract
The present invention relates to a single ball double safe leading operating safety valve which belongs to the safety devices of fluid pressure systems. The single ball double safe leading operating safety valve is composed of a main valve and a leading mechanism, wherein the main valve is provided with a pressurization cavity (1), and the leading mechanism is provided with a high pressure cavity (19), a control cavity (20) and a pressure relief cavity (21). A spherical valve element (22) arranged in the control cavity can make the pressurization cavity (1) respectively communicated with or isolated from the high pressure cavity (19) or the pressure relief cavity (21). The main valve of the safety valve can act accurately under the operation of the leading mechanism. In addition, once the leading mechanism has failure, the main valve of the safety valve can automatically act under the pressure which is higher than prescribed opening pressure, so that the single ball double safe leading operating safety valve has double safe action for the protected fluid pressure system. The present invention has the characteristics of simple structure, good tightness performance, small opening and closing differential pressure, etc.
Description
The present invention is a kind of safety valve, belongs to the safety installations of fluid-pressure system.
Existing pilot operated safety valve is made up of main valve and guide mechanism two-part, B. P. GB1411921 for example, and guide mechanism is used for operating main valve, makes when main valve is in closed condition, obtains a very big clean sealing force.This sealing force is mainly provided by the pressure medium of protected fluid-pressure system, to guarantee reliable sealing.When the pressure of protected fluid-pressure system rose to the popping pressure of safety valve, guide mechanism at first moved, and that part of clean sealing force that is provided by pressure medium is provided, and main valve just is opened to specified altitude rapidly, began discharging; When the pressure of protected fluid-pressure system was reduced to the Reseating pressure of a safety valve of safety valve, guide mechanism moved once more, made that part of sealing force that main valve regains to be provided by pressure medium, and main valve just returns seat immediately, is returned to closed condition.Obvious this pilot operated safety valve, the action safety of main valve depends on guide mechanism.In addition, the guide mechanism of this safety valve needs the teamwork of two valve elements at least, just can finish its action function, and its structure is complicated.
The objective of the invention is: invent a kind of pilot operated safety valve; its guide mechanism only needs a valve element; simplify guide mechanism; make simultaneously this safety valve can not only be under the operation of guide mechanism precision maneuver; in case and guide mechanism is malfunctioning, its main valve also can be higher than auto-action under the popping pressure, protected fluid-pressure system had the effect of dual fail-safe.
Of the present invention being constructed as follows:
A kind of pilot operated safety valve is made up of main valve and guide mechanism two-part.Main valve has a pressurizing chamber, valve core of main valve is set like this, makes its end to form sealing with the main valve valve seat, the other end can bear the pressure effect of pressure medium in the main valve pressurizing chamber, and the direction of this active force is consistent with the direction that valve core of main valve is opened, and effect has main spring power on the valve core of main valve.It provides sealing force for the sealing of valve core of main valve and valve base chamber.Guide mechanism is provided with three chambeies: a hyperbaric chamber, a control chamber and a pressure-releasing chamber.Hyperbaric chamber is communicated with the main valve inlet side; Control chamber is communicated with the main valve pressurizing chamber; Pressure-releasing chamber is communicated with main valve outlet side or atmosphere.Feature of the present invention is: a spherical valve member is arranged in the control chamber, and two sealing surfaces are set in this chamber, can form sealing with spherical valve member respectively, two sealing surfaces are set like this, make one of them in hyperbaric chamber one side, another is in pressure-releasing chamber one side, and when spherical valve member and when the sealing surface of hyperbaric chamber one side forms sealing, control chamber promptly completely cuts off with hyperbaric chamber and is communicated with pressure-releasing chamber, this moment, the part of spherical valve member was exposed in the hyperbaric chamber, when spherical valve member and when the sealing surface of pressure-releasing chamber one side forms sealing, control chamber promptly completely cuts off with pressure-releasing chamber and is communicated with hyperbaric chamber, and this moment, the part of spherical valve member was exposed in the pressure-releasing chamber.Effect has guide's spring force on spherical valve member.One barrier film formerly is set between guided missile spring and pressure-releasing chamber, and this barrier film helps the action of guide mechanism, guide's spring and flowing medium can also be separated simultaneously, makes guide's spring avoid the direct effect of flowing medium (burn into temperature action etc.).
When this safety valve is in closed condition, spherical valve member in guide's mechanism controls chamber, under the effect of formerly leading spring force, form sealing with sealing surface in hyperbaric chamber one side, act on the spherical valve member this moment the opposite power of both direction: one is the thrust that spherical valve member is exposed to that part of suffered pressure medium in the hyperbaric chamber, and its attempt is pushed spherical valve member open from sealing station; It is two for acting on guide's spring force on the spherical valve member, and its attempt is pressed on spherical valve member on the sealing surface.Because the latter greater than the former, so have a clean sealing force in spherical valve member and between the sealing surface of hyperbaric chamber one side, makes the two set up sealing.As previously mentioned, control chamber completely cut off with hyperbaric chamber and was communicated with pressure-releasing cavity this moment, so the pressure in the main valve pressurizing chamber equates with the pressure (or barometric pressure) of safety valve outlet side, this moment, valve core of main valve also acted on the opposite power of both direction, one be valve core of main valve in the suffered pressure medium thrust of valve seat end, it is two in order to maintain the main spring power that valve core of main valve and valve base chamber seal.Determine main spring power like this, make it to the active force of valve core of main valve all the time greater than the thrust of valve core of main valve at the suffered pressure medium of valve seat end, so when safety valve is in closed condition, all the time there is a clean sealing force between the sealing surface of valve core of main valve and valve seat, for main valve provides reliable sealing.When protected system fluid pressure rises to the popping pressure of this safety valve; because the thrust of the pressure medium that the spherical valve member in guide's mechanism controls chamber is suffered increases; it can overcome the effect of guide's spring force and spherical valve member is pushed open from its sealing station; so the pressure medium in the hyperbaric chamber flow in control chamber and even the pressure-releasing chamber; be arranged on the barrier film between guide's spring and the pressure-releasing chamber; be subjected to the effect of this pressure medium; produce one with guide's spring force direction opposite effect power (certainly; if barrier film formerly is not set between guided missile spring and pressure-releasing chamber; utilize backsurging principle, also can on structural design, obtain this active force at an easy rate).This active force help spherical valve member promptly is separated from the sealing surface of hyperbaric chamber one side and contacts and set up sealing with the sealing surface of pressure-releasing chamber one side, make that control chamber and pressure-releasing chamber are isolated and be communicated with hyperbaric chamber, the main valve pressure chamber is pressurizeed rapidly as a result, make valve core of main valve obtain the additional thrust of a very big pressure medium, because this thrust is consistent with the valve core of main valve opening direction, therefore its pressure medium thrust of being born at the valve seat end with valve core of main valve, overcome main spring power and promptly valve core of main valve is pushed into the Lift of regulation, make this safety valve be in emissions status.Pressure when protected fluid-pressure system; when reducing to the Reseating pressure of a safety valve of this safety valve; because the thrust of the pressure medium that the spherical valve member in guide's mechanism controls chamber is suffered reduces; this thrust can't be kept spherical valve member on the sealing position and the balance between guide's spring force; guide's spring force is just pushed spherical valve member open from the sealing position; make spherical valve member with fit at the sealing surface of hyperbaric chamber one side and set up sealing; be communicated with pressure-releasing chamber so control chamber is promptly isolated with hyperbaric chamber; the rapid release of main valve pressurizing chamber as a result; because valve core of main valve has lost additional that part of very big medium thrust to it in the pressurizing chamber; it is just under the effect of main spring power; overcome and return seat in the effect of the suffered medium thrust of main valve valve seat end rapidly; set up sealing with the main valve valve seat, make this safety valve be returned to closed condition.Different with aforesaid guide's safety valve; because this safety valve maintains the power of valve core of main valve and valve base chamber sealing and is only provided by main spring; therefore even if this safety valve is in guide mechanism when malfunctioning; its main valve also can move being higher than under its compulsory exercise pressure, and this then has the second protection effect to protected fluid-pressure system.
Valve element in certain above-mentioned guide's mechanism controls chamber, it can be other non-spherical structure, for example column construction, two ends have the column construction of sphere or garden frustum structure etc., if this valve element spare respectively can with form line contact sealing or face contact seal at the sealing surface of hyperbaric chamber one side with sealing surface in pressure-releasing chamber one side.But in all these structures, with the sealing between this valve element of the easier realization of spherical structure and this two sealing surfaces.
As a kind of embodiment of the present invention, guide mechanism is placed in the main valve body, constitute built-in leading operated safety valve with single ball and double insurance.At this moment, hyperbaric chamber, control chamber and pressure-releasing chamber are set in valve core of main valve, and three passages are set on valve core of main valve, respectively hyperbaric chamber is communicated with safety valve outlet side or atmosphere with main valve pressurizing chamber and pressure-releasing chamber with safety valve inlet side, control chamber.The characteristics of this embodiment are compact structures, are particularly useful for the bigger occasion of safety valve discharging bore.
As another embodiment of the present invention, guide mechanism is placed on outside the main valve body, constitute the external leading operated safety valve with single ball and double insurance.This moment, guide mechanism formed a pilot valve, this pilot valve is provided with guide's valve body and guide's spring, hyperbaric chamber, control chamber and pressure-releasing chamber are set in the pilot valve body, respectively hyperbaric chamber are communicated with safety valve outlet side or atmosphere with main valve pressurizing chamber and pressure-releasing chamber with safety valve inlet side, control chamber with connectedness.The characteristics of this embodiment are, dispose necessary annex on the connectedness of pilot valve hyperbaric chamber and main valve inlet side, can realize the field-checking to this safety valve, in addition, when safety valve discharging bore is less, do not cause whole safety valve structure heaviness.
Major advantage of the present invention is:
1. because guide mechanism only needs a simple valve element, so it is simple in structure, and the reliability of guide's mechanism action and accuracy are higher;
2. since main valve can not only be under the operation of guide mechanism precision maneuver, and auto-action when can be in guide mechanism malfunctioning, so this safety valve has the dual fail-safe effect to protected fluid-pressure system, its reliability height.
3. since near main valve normally open jumpings when (referring to jumpings of opening under guide mechanism operation), main spool spring still can provide the clean sealing force of necessity for the sealing between valve core of main valve and main valve seat, so the sealability of this safety valve is easy to assurance.
4. the Blowdown of a safety valve owing to this safety valve is not limit by the main valve Lift, so its satisfies the requirement to Lift and Blowdown of a safety valve easily simultaneously.
Fig. 1 and Fig. 2 are two embodiments of the present invention.Fig. 1 is a kind of built-in leading operated safety valve with single ball and double insurance, and Fig. 2 is a kind of external leading operated safety valve with single ball and double insurance.
In Fig. 1, main valve pressurizing chamber (1) is made up of main valve plug (2) and main valve core retainer plate (3), main valve plug (2) main valve core retainer plate (3) relatively is in axial sliding, sliding seal component (4) and (5) provide sealing for pressurizing chamber (1), the upper end of main valve plug (2) acts on a main spring (6), the other end of main spring (6) acts on the main spring adjustment sleeve (7), main spring adjustment sleeve (7) links to each other with main valve core retainer plate (3) screw thread, regulate main spring adjustment sleeve (7) and can regulate the size of main spring power, a base (27) is threaded in the lower end of main valve plug (2), base (27) is sentenced sphere with an interchangeable main valve core print (8) in (9) conical surface is contacted, and can form sealing at this place, so main valve plug (2) can be realized automatic positioning, seal element (42) is for providing sealing between base (27) and the main valve plug (2), the carriage (10) that is threaded with main valve plug (2), on the one hand hold main valve core print (8), open the high jump degree in order to restriction main valve plug (2) on the other hand with it.Main valve core print (8) and main valve seat (11) locate to form sealing in (12), recoil seat (13), and chek bolt (14) has constituted the recoil mechanism of this safety valve with carriage (10).Main valve seat (11) is threaded with following valve body (15), and by the adpting flange clamping of the lower flange (16) of following valve body with protected fluid-pressure system.Main valve core retainer plate (3) is connected flange (17) and is fixedly clamped with following valve body (15).Upper valve body (18) is threaded with adpting flange (17).Be provided with hyperbaric chamber (19) in main valve plug (2), control chamber (20) and pressure-releasing chamber (21) have a steel ball (22) in control chamber (20), and sealing surface (23) is positioned at hyperbaric chamber (19) one sides, and sealing surface (24) is positioned at pressure-releasing chamber (21) one sides.Hyperbaric chamber (19) is communicated with the inlet side (26) of this safety valve by the passage (25) on the main valve core print (8), passage (28) is communicated with control chamber (20) with main valve pressurizing chamber (1), passage (29) is communicated with pressure-releasing chamber (21) with safety valve outlet side (30).Sliding mandril (31) can axially slide in pressure-releasing chamber (21), the active force of guide's spring (33) that it can transmit guide's push rod (32) is passed to steel ball (22), on sliding mandril (31), have passage (34), (35) and (36), make pressure medium flow.Between sliding mandril (31) and guide's push rod (32) barrier film (37) is set, it is pressed on the main valve plug (2) by guide's spring housing (38).Screw thread links to each other between guide's spring housing (38) and the main valve plug (2).Formerly lead the guide's spring adjustment set (39) that is threaded on the spring housing (38), the size of available its adjusting guide spring force.One end of guide's spring (33) acts on guide's spring adjustment set (39), and the other end acts on guide's push rod (32), and by guide's push rod (32), lever (40) and wrench (41) etc. are formed the manually opened mechanism of this safety valve.
When this safety valve is in closed condition, steel ball (22) in guide's mechanism controls chamber (20) is formerly led under the effect of spring force, overcome pressure medium to it thrust and fit with sealing surface (23) and set up sealing, at this moment, control chamber (20) completely cuts off with hyperbaric chamber (19) and is communicated with pressure-releasing chamber (21), that is by passage (28), control chamber (20), passage (34), (35) reach (36), passage (29) is communicated with main valve pressurizing chamber (1) with safety valve outlet side (30), main valve plug this moment (2) is subjected to both direction opposite effect power, the active force of first main spring (6), it two is the suffered medium thrust of main valve core print (8), because the former is all the time greater than the latter, therefore the sealing located in (12) of main valve plug (2) and main valve seat (11) has a clean sealing force to exist all the time, guarantees the reliability that this place seals.When the pressure of safety valve inlet side (26) rises to the popping pressure of this safety valve, the thrust that steel ball (22) is exposed to that part of suffered pressure medium in the hyperbaric chamber (19) can overcome the effect of guide's spring force and steel ball is pushed open from sealing surface (23), this moment, pressure medium can leak in control chamber (20) and the pressure-releasing chamber (21), barrier film (37) be subjected to the effect of this medium produce one with the identical active force of steel ball (22) opening direction, help steel ball (22) is pushed into sealing surface (24) rapidly, making steel ball (22) and sealing surface (24) fit and set up seals, control chamber this moment (20) is communicated with hyperbaric chamber (19) and completely cuts off with pressure-releasing chamber (21), that is the pressure medium of safety valve inlet side (26) can be by passage (25) hyperbaric chamber (19) on the main valve core print (8), control chamber (20), passage (28) on the main valve plug (2), add in the main valve pressurizing chamber (1), so main valve plug (2) has just obtained a very big additional forces of coming the pressure medium in the autonomous valve pressurizing chamber (1), the direction of this additional forces is consistent with the opening direction of main valve plug (2), main valve plug (2) just is opened into the Lift of its regulation rapidly as a result, make safety valve inlet side (26) and outlet side (30) conducting, this safety valve enters emissions status.When the pressure of safety valve inlet side (26) is reduced to the Reseating pressure of a safety valve of this safety valve, the thrust of the pressure medium that steel ball (22) is suffered also reduces, guide's spring (33) is just by guide's push rod (32), barrier film (37), sliding mandril (31) is pushed into sealing surface (23) to steel ball (22) from sealing surface (24), and make steel ball (22) and sealing surface (23) set up sealing, make that control chamber (20) and hyperbaric chamber (19) are isolated and be communicated with pressure-releasing chamber (21), that is the pressure medium in the main valve pressurizing chamber (1) is by the passage (28) on the main valve plug (2), control chamber (20), passage on the sliding mandril (34), (35) and the passage (29) on (36) and the main valve plug (2) be disposed to the outlet side (30) of safety valve, make main valve pressurizing chamber (1) pressure release rapidly, main valve plug (2) is owing to lost the additional thrust of the middle pressure medium of pressurizing chamber (1) to it, under the effect of main spring (6), return seat rapidly, set up sealing by main valve core print (8) and main valve seat (11), make the inlet side (26) of safety valve isolated with outlet side (30), thereby emissions status stops, and safety valve returns back to close valve state.
Fig. 2 is the external leading operated safety valve with single ball and double insurance.Be communicated with by pipe fitting between main valve (58) and the pilot valve (59), pipe fitting (44) is communicated with main valve pressurizing chamber (1) with pilot valve control chamber (20), pipe fitting (45) is communicated with main valve inlet side (26) with pilot valve hyperbaric chamber (19), pipe fitting (46) is communicated with main valve outlet side (30) with pilot valve pressure-releasing chamber (21), connecting pipe (45) is provided with threeway (47), check valve (48) and stop valve (49), they are as the field-checking of this safety valve, when verification, only need the other end (50) of stop valve is connected with a pressure source, open stop valve (49), can carry out verification.In Fig. 2, the main valve core print need not to be provided with via on (8), and the automatic positioning effect between main valve core print (8) and main valve seat (11) is produced by bead (51).Protecting cover (52) is threaded with main spring adjustment sleeve (7).In pilot valve (59), originally the cavity effect (referring to Fig. 1) of main valve plug (2) is replaced by guide's valve body (53).Link (54) links to each other base (27) with pipe fitting (45).The sliding mandril (31) of pilot valve (59) is provided with axial guide hole (55), and purpose is to allow pressure medium pass through.With connecting plate (56) and connecting bolt (57) pilot valve (59) and main valve (58) are fixed together.Inside extending tube (43) is set, can avoids the pressure reduction that flows and cause because of the fluid in the main valve seat (11).Identical among Fig. 2 among the title of all the other each labels and effect and Fig. 1.The operating principle of the built-in leading operated safety valve with single ball and double insurance among the operating principle of the external leading operated safety valve with single ball and double insurance among Fig. 2 and Fig. 1 is identical.
Claims (5)
1, leading operated safety valve with single ball and double insurance, it is made up of main valve and guide mechanism two-part, main valve has a pressurizing chamber, valve core of main valve is set like this, make its end to form sealing with the main valve valve seat, the other end can bear the pressure effect of pressure medium in the main valve pressurizing chamber, and the direction of this active force is consistent with the direction that valve core of main valve is opened, effect has main spring power on the valve core of main valve, guide mechanism is provided with three chambeies, a hyperbaric chamber, a control chamber and a pressure-releasing chamber, hyperbaric chamber is communicated with the main valve inlet side, control chamber is communicated with the main valve pressurizing chamber, pressure-releasing chamber is communicated with main valve outlet side or atmosphere, it is characterized in that: be provided with a valve element in the control chamber, also have two energy and this valve element to form the sealing surface of sealing, this two sealing surfaces are set like this, make one of them be positioned at hyperbaric chamber one side, another is positioned at pressure-releasing chamber one side, and when the valve element forms sealing with the sealing surface that is positioned at hyperbaric chamber one side, then control chamber promptly completely cuts off with hyperbaric chamber and is communicated with pressure-releasing chamber, this moment, the part of valve element was exposed in the hyperbaric chamber, when the valve element forms sealing with the sealing surface that is positioned at pressure-releasing chamber one side, then control chamber promptly completely cuts off with pressure-releasing chamber and is communicated with hyperbaric chamber, and this moment, the part of valve element was exposed in the pressure-releasing chamber, and effect has guide's spring force all the time on the valve element.
2, its feature of leading operated safety valve with single ball and double insurance according to claim 1 also is: the valve element in guide's mechanism controls chamber is a spherical structure, or can and be positioned at the sealing surface formation line contact sealing of pressure-releasing chamber one side or other structures of face contact seal with the sealing surface that is positioned at hyperbaric chamber one side respectively.
3, its feature of leading operated safety valve with single ball and double insurance according to claim 1 and 2 also is: a barrier film formerly is set between guided missile spring and pressure-releasing chamber.One sliding mandril is set in the pressure-releasing chamber.
4, its feature of leading operated safety valve with single ball and double insurance according to claim 1 and 2 also is: guide mechanism is arranged in the valve body of main valve, this moment hyperbaric chamber, control chamber and pressure-releasing chamber all are arranged in the valve core of main valve, and valve core of main valve is provided with three passages, with hyperbaric chamber and main valve inlet side, control chamber is communicated with main valve outlet side or atmosphere with main valve pressurizing chamber and pressure-releasing chamber respectively.
5, its feature of leading operated safety valve with single ball and double insurance according to claim 1 and 2 also is: guide mechanism is arranged at valve body of main valve and forms a pilot valve outward, this pilot valve is provided with guide's valve body and guide's spring, the hyperbaric chamber of guide mechanism, control chamber and pressure-releasing chamber all are arranged in guide's valve body, be communicated with by connectedness respectively between hyperbaric chamber and main valve inlet side, control chamber and main valve pressurizing chamber and pressure-releasing chamber and main valve outlet side or atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87108297 CN1027918C (en) | 1987-12-30 | 1987-12-30 | Leading operated safety valve with single ball and double insurance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87108297 CN1027918C (en) | 1987-12-30 | 1987-12-30 | Leading operated safety valve with single ball and double insurance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1034049A CN1034049A (en) | 1989-07-19 |
| CN1027918C true CN1027918C (en) | 1995-03-15 |
Family
ID=4816468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87108297 Expired - Fee Related CN1027918C (en) | 1987-12-30 | 1987-12-30 | Leading operated safety valve with single ball and double insurance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1027918C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11306838B2 (en) * | 2020-03-27 | 2022-04-19 | Dresser, Llc | Pilot-operated pressure relief valve nozzle |
-
1987
- 1987-12-30 CN CN 87108297 patent/CN1027918C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1034049A (en) | 1989-07-19 |
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