CN111734858A - Ultrahigh-performance steam safety valve - Google Patents
Ultrahigh-performance steam safety valve Download PDFInfo
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- CN111734858A CN111734858A CN202010797466.4A CN202010797466A CN111734858A CN 111734858 A CN111734858 A CN 111734858A CN 202010797466 A CN202010797466 A CN 202010797466A CN 111734858 A CN111734858 A CN 111734858A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/0486—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with mechanical actuating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/168—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side combined with manually-controlled valves, e.g. a valve combined with a safety valve
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses an ultrahigh-performance steam safety valve, aiming at solving the defects of poor seat return performance and large opening and closing pressure difference of the steam safety valve. The back pressure valve comprises a valve body, a valve seat, a valve rod and a valve clack, wherein a valve cavity is arranged in the valve body, a guide sleeve is arranged in the valve cavity, the upper end of the guide sleeve is sequentially connected with a middle cover and a top cover, the lower end of the valve rod is connected with the valve clack sleeve, the valve clack sleeve is movably sleeved in the guide sleeve, a back pressure cavity is formed between the inner wall of the valve clack sleeve and the valve rod, and a plurality of back pressure taking holes; be equipped with the spacer sleeve in with well lid inner chamber and fall into air chamber, lower air chamber, in cover be equipped with the gas vent of last air chamber intercommunication, go up the air chamber and set up the air vent down between the air chamber, the cover corresponds the position and connects the lantern ring in on the valve rod, lantern ring lower extreme is equipped with the water conservancy diversion face that the slope set up, clamping ring under the installation of spacer sleeve upper surface inward flange, but the lower floating packing ring of radial movement of installation between lower clamping ring and the spacer sleeve, lower floating packing ring suit is on the lantern ring.
Description
Technical Field
The present invention relates to a safety valve, and more particularly, to an ultra high performance steam safety valve.
Background
At present, the requirement of ASME I on the opening and closing pressure difference of a steam safety valve for a power boiler is 4-6%, and the opening and closing pressure difference of the safety valve of the same category of most safety valve manufacturers in China is 7% of the national standard requirement. The operating pressure of the large-scale power plant in China is 95% of the setting pressure of the safety valve, so that a plurality of safety valve products do not meet the use requirement. The present application is directed to developing an ultra high performance steam relief valve to meet market usage requirements and gain opportunities in commercial competition.
Disclosure of Invention
The invention overcomes the defects of poor seat returning performance and large opening and closing pressure difference of the steam safety valve, and provides the ultrahigh-performance steam safety valve which has good seat returning performance and low opening and closing pressure difference.
In order to solve the technical problems, the invention adopts the following technical scheme: a kind of ultra-high performance steam relief valve, including valve block, valve base, valve stem, valve flap, there are valve cavities in the valve block, the valve base is installed in valve block, the valve flap connects to the bottom end of valve stem, the valve flap seals and butts against the upper end of valve base, install the guide sleeve in the valve cavity, the upper end of guide sleeve connects with middle cover, top cap sequentially, the bottom end of valve stem connects the valve flap set, the valve flap set is fitted in the guide sleeve movably, form the back pressure cavity between valve flap set inner wall and valve stem, the bottom end of valve flap set has several back pressure; be equipped with the spacer sleeve in with well lid inner chamber and fall into air chamber, lower air chamber, in cover be equipped with the gas vent of last air chamber intercommunication, set up the air vent between last air chamber and the lower air chamber, the cover corresponds the position and connects the lantern ring in the valve rod, lantern ring lower extreme is equipped with the water conservancy diversion face that the slope set up, clamping ring under the installation of spacer sleeve upper surface inward flange, but install radial movement's lower floating packing ring between lower clamping ring and the spacer sleeve, lower floating packing ring suit is on the lantern ring, be equipped with the removal clearance between lower floating packing ring inner wall and the lantern ring outer wall, the water conservancy diversion face is arranged in lower floating packing ring below.
Because of the high sealing performance of the elastic sealing design of the valve flap, the valve is still sealed under 97% of set pressure, 98% of the pressure begins to leak, and 100% of the pressure begins to rise rapidly, the back pressure in the back pressure cavity is increased in the process, and the opening between the sleeve ring and the lower floating gasket is not opened, so that the opening is slightly unfavorable from the point of view, but the quick opening effect in the front is achieved rapidly, so that the opening height reaches the position where the opening formed by the inclined guide surface at the lower end of the sleeve ring and the lower floating gasket is gradually enlarged, at the moment, the medium in the back pressure cavity can be discharged from the opening formed by the lower end of the sleeve ring and the lower floating gasket, the back pressure can be reduced, the valve flap can be lifted further rapidly, and stable discharge for a period of time is realized (even if the working pressure is lower than 100%).
In the process, the safety valve is opened, at the moment, a part of steam enters the back pressure cavity through the back pressure taking hole, a part of steam in the back pressure cavity is discharged outwards through the lower air chamber, the vent hole, the upper air chamber and the exhaust port, a part of steam is accumulated in the isolating sleeve, the pressure in the isolating sleeve is increased, when an opening formed by the inclined flow guide surface at the lower end of the lantern ring and the lower floating gasket is gradually enlarged along with the ascending of the valve clack, the part of medium is discharged outwards through the upper air chamber and the exhaust port from the opening, the back pressure is reduced, the valve clack generates two-stage action, and the full opening is further realized. Meanwhile, the lower floating washer is arranged in a floating mode and can move in the radial direction, and the lower floating washer freely moves to reach a dynamic balance state according to different air pressures at various positions on the inner wall of the lower floating washer, so that the obstruction to air flow is reduced, and the steam is favorably and quickly discharged; and the lower floating gasket has certain free movement space in the radial direction, and the lower floating gasket can follow the lantern ring no matter how the valve rod moves, so that any obstruction to the action of the lantern ring is avoided, and the phenomenon of valve rod clamping stagnation at the position is avoided.
When the working pressure begins to drop to about 97%, the valve clack begins to fall back, and because the opening formed by the inclined guide surface at the lower end of the lantern ring and the lower floating gasket is gradually reduced, after the gap is completely closed, the medium in the back pressure cavity cannot be discharged from the vent hole, the back pressure rises and acts on the back of the valve clack sleeve to accelerate the seat returning action of the valve clack. The ultrahigh-performance steam safety valve has good seat returning performance and low opening and closing pressure difference.
Preferably, a mounting ring groove is formed between the lower surface of the inner edge of the lower pressing ring and the isolation sleeve, and the lower floating gasket is radially movably mounted in the mounting ring groove. The lower floating washer is stably and reliably installed and cannot be separated from the lower compression ring.
Preferably, a top plate is arranged between the middle cover and the top cover, an upper pressure ring is arranged on the top plate, an upper floating gasket capable of moving radially is arranged between the upper pressure ring and the top plate, the upper floating gasket is sleeved on the lantern ring, and a moving gap is arranged between the inner wall of the upper floating gasket and the outer wall of the lantern ring. The setting of the upper floating gasket plays a certain sealing role on one hand, and plays a positioning role for the lantern ring on the other hand, the upper floating gasket has a certain free activity space in the radial direction, no matter how the valve rod moves, the upper floating gasket can follow the lantern ring, any obstruction can not be brought to the action of the lantern ring, and the phenomenon of valve rod clamping stagnation is avoided to occur at the position.
As preferred, the stop collar of height-adjusting about the installation can be gone up to the valve rod, and the back pressure intracavity is arranged in to the stop collar, is equipped with the full-open interval between stop collar and the spacer sleeve, and the stop collar can butt on the spacer sleeve. When the valve clack is fully opened, the upper end of the limiting sleeve is abutted to the lower end of the isolating sleeve, the height of the limiting sleeve can be adjusted up and down, the full-opening distance is convenient to adjust, and the safety valve is flexible and convenient to use.
As preferred, lantern ring threaded connection can go on the valve rod height-adjusting from top to bottom, and the lantern ring upper end is equipped with a plurality of anti-rotating groove, connects the locating pin between anti-rotating groove and the valve rod, and lantern ring upper end position is equipped with the position scale stripe on the valve rod outer wall. The height of the lantern ring is convenient to adjust; the lantern ring moves down and adjusts the height position, when returning the seat, is favorable to making the lantern ring and the opening that floats down and put between the packing ring to reduce fast, and the backpressure risees fast for return the seat speed.
Preferably, the outer wall of the valve clack sleeve is provided with a plurality of annular grooves. The annular groove can reduce the influence caused by friction and material expansion.
Preferably, the lower end of the valve clack is of a conical structure, a circle of sealing convex ring is arranged at the edge of the valve clack, a circle of sealing lip is arranged at the inner edge of the sealing convex ring, the sealing lip is arranged in an inward inclining mode from top to bottom, and the lower end face of the sealing lip is of a planar structure and is in sealing fit with the upper end face of the valve seat; and a pressure gathering groove is formed among the sealing lip, the inner wall of the sealing convex ring and the lower surface of the valve clack.
The valve clack with the structure has good sealing performance. The pressure of the steam medium accumulated in the pressure accumulation groove acts on the sealing lip, so that the acting force of the sealing lip on the upper end face of the valve seat is increased, and the sealing performance is improved.
Preferably, the outer wall of the lower end of the guide sleeve is connected with an upper adjusting sleeve, the outer wall of the upper end of the valve seat is connected with a lower adjusting sleeve, and a pressure storage chamber is formed between the upper end of the lower adjusting sleeve and the lower end of the valve clack.
The upper adjusting sleeve is adjusted first, and the lower adjusting sleeve is adjusted. The upper adjusting sleeve moves upwards, the recoil pressure rises, the discharge pressure slightly rises, the upper adjusting sleeve moves downwards, the recoil pressure falls, and the discharge pressure slightly falls. The lower adjusting sleeve moves upwards, the discharge pressure is reduced, the full opening can be realized by smaller pressure, and the recoil pressure is slightly reduced; the lower adjusting sleeve moves downwards, the discharge pressure rises, and the recoil pressure slightly increases. Through the regulation to last adjusting collar and adjusting collar down, can finely tune the discharge pressure and the reseating pressure of relief valve, it is nimble convenient to use.
Preferably, a plurality of flow increasing grooves are uniformly formed in the upper floating gasket and the lower floating gasket on the outer wall of the lantern ring, a sliding block and a push plate are installed in each flow increasing groove, a positioning spring is installed between each sliding block and the bottom surface of each flow increasing groove, a pushing column is arranged on each sliding block, each pushing column is obliquely arranged on each pushing surface and attached to each pushing surface, a return spring is installed between each pushing plate and each flow increasing groove, an extending arm extending outwards is arranged at the upper end of each pushing plate, a cover plate is connected with the opening position of each flow increasing groove corresponding to each pushing plate, the cover plate covers the corresponding pushing plates, an avoiding groove is formed between each extending arm and the upper end of each cover plate, the outer surfaces of the cover plates and the sliding blocks are exposed out of the outer wall of the lantern ring, a plurality of positioning grooves are formed in; the extension arm moves up along with the valve rod, after the water conservancy diversion face of lantern ring lower extreme reached lower floating washer position, thereby the valve rod continues the rebound make the extension arm butt move down for the slider on the upper plenum inner wall, thereby the promotion face in the push pedal drives the promotion post and moves to increasing the chute bottom surface, makes the slider shrink inwards, increases the chute open end and exposes.
The extension arm is along with valve rod rebound, after the water conservancy diversion face of lantern ring lower extreme reachd lower superficial packing ring position, thereby the valve rod continues rebound makes the extension arm butt make the push pedal move down for the slider on the upper plenum inner wall, thereby the promotion face in the push pedal drives the promotion post and moves to the bottom surface of the flow increasing groove, make the slider shrink inwards, the flow increasing groove open end exposes, thereby increase the through-flow cavity between lower floating packing ring inner wall and the lantern ring outer wall, be favorable to the steam medium of backpressure intracavity to discharge fast, accelerate the full boot speed of valve clack. When the valve rod returns to the seat downwards, the extension arm is separated from the inner wall of the upper air chamber, the extension arm moves upwards to return under the action of the return spring, and the sliding block moves outwards in the radial direction to return under the action of the positioning spring.
Preferably, a support is arranged above the sliding block at the bottom of the flow increasing groove, a positioning block is arranged at the upper end of the pushing face of the pushing plate, the positioning block is installed between the bottom of the flow increasing groove and the cover plate in an adaptive mode, and the return spring is abutted between the support and the positioning block. The push plate is installed stably and reliably.
Compared with the prior art, the invention has the beneficial effects that: (1) the steam safety valve has good seat returning performance and low opening and closing pressure difference; (2) the safety valve has high full-opening speed.
Drawings
FIG. 1 is a schematic structural view of embodiment 1 of the present invention;
FIG. 2 is a partially enlarged schematic view of embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of embodiment 2 of the present invention;
FIG. 4 is a partially enlarged schematic view of embodiment 2 of the present invention;
FIG. 5 is a schematic view of the mounting structure of a slider according to embodiment 2 of the present invention;
in the figure: 1. the valve comprises a valve body 1-1, a valve seat 2, a valve rod 3, a valve clack 4, a valve cavity 5, a medium inlet 6, a medium outlet 7, a sealing convex ring 8, a sealing lip 9, a pressure gathering groove 10, a guide sleeve 11, a middle cover 12, a top cover 13, a valve clack sleeve 14, an annular groove 15, a back pressure cavity 16, a back pressure taking hole 17, an upper adjusting sleeve 18, a lower adjusting sleeve 19, an upper air chamber 20, a lower air chamber 21, an exhaust port 22, a vent hole 23, a sleeve ring 24, a flow guide surface 25, a lower pressing ring 26, a lower floating gasket 27, a top plate 28, an upper pressing ring 29, an upper floating gasket 30, a limiting sleeve 31, a full opening distance 32, a retaining sleeve 33, a position scale stripe 34, a valve cover 35, a valve cap 36, a setting spring 37, an upper spring seat 38, a lower spring seat 39, an adjusting screw sleeve 40 and a supporting seat, 41. the device comprises a shifting fork, 42, a pressure relief handle, 43, a flow increasing groove, 44, a sliding block, 45, a push plate, 46, a positioning spring, 47, a pushing column, 48, a pushing surface, 49, a return spring, 50, an extension arm, 51, a cover plate, 52, an avoiding groove, 53, a positioning groove, 54, a positioning raised head, 55, a support, 56 and a positioning block.
Detailed Description
The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:
example 1: a kind of ultra-high performance steam relief valve (refer to the attached figure 1, attached figure 2), including valve block 1, valve base 1-1, valve stem 2, valve flap 3, there are valve cavities 4 in the valve block, there are medium inlet 5, medium outlet 6 communicated with valve cavity on the valve block, the valve base is installed in the medium inlet position in the valve base, the valve flap is connected at the lower end of valve stem, the valve flap seals and butts on the upper end of valve base. The lower end of the valve clack is of a conical structure, a circle of sealing convex ring 7 protruding downwards is arranged at the edge of the valve clack, a circle of sealing lip 8 is arranged at the inner edge of the sealing convex ring, the sealing lip is arranged in an inward inclining mode from top to bottom, and the lower end face of the sealing lip is of a planar structure and is in sealing fit with the upper end face of the valve seat; a pressure gathering groove 9 is formed among the sealing lip, the inner wall of the sealing convex ring and the lower surface of the valve clack.
A guide sleeve 10 is arranged in the valve cavity, the upper end of the guide sleeve is sequentially connected with a middle cover 11 and a top cover 12, the top cover is tightly connected with the valve seat, the lower end of the valve rod is connected with a valve clack sleeve 13, the valve clack sleeve is movably sleeved in the guide sleeve, the outer wall of the valve clack sleeve is provided with a plurality of annular grooves 14, a back pressure cavity 15 is formed between the inner wall of the valve clack sleeve and the valve rod, and the lower end of the valve clack sleeve is provided with a; the back pressure tapping hole is of a step hole-shaped structure, and the aperture of the upper part is smaller than that of the lower part. An upper adjusting sleeve 17 is connected on the outer wall of the lower end of the guide sleeve, a lower adjusting sleeve 18 is connected on the outer wall of the upper end of the valve seat, and a pressure accumulation chamber is formed between the upper end of the lower adjusting sleeve and the lower end of the valve clack.
Be equipped with the spacer sleeve in with well lid inner chamber and fall into air chamber 19, lower air chamber 20, in cover be equipped with the gas vent 21 of last air chamber intercommunication, set up air vent 22 between last air chamber and the lower air chamber, the lantern ring 23 is connected to the upper and middle lid correspondence position on the valve rod, the lantern ring lower extreme is equipped with the water conservancy diversion face 24 that the slope set up, the water conservancy diversion face is from last down to the slope setting of being close to lantern ring axis direction, clamping ring 25 under the spacer sleeve upper surface inward flange installation, but install radial movement's lower floating packing ring 26 between lower clamping ring and the spacer sleeve, lower floating packing ring suit is on the lantern ring, be equipped with the removal clearance down between floating packing ring inner wall and the lantern ring outer wall, the water conservancy diversion face. An installation ring groove is formed between the lower surface of the inner edge of the lower pressing ring and the isolating sleeve, and the lower floating gasket can be radially movably installed in the installation ring groove. The outer diameter of the lower floating washer is smaller than that of the mounting ring groove, and the inner diameter of the lower floating washer is larger than that of the lantern ring.
A top plate 27 is arranged between the middle cover and the top cover, an upper pressure ring 28 is arranged on the top plate, an upper floating gasket 29 capable of moving in the radial direction is arranged between the upper pressure ring and the top plate, the upper floating gasket is sleeved on the lantern ring, and a moving gap is arranged between the inner wall of the upper floating gasket and the outer wall of the lantern ring. An installation ring groove is formed between the lower surface of the inner edge of the upper pressing ring and the top plate, and the upper floating gasket can be radially movably installed in the installation ring groove. The outer diameter of the upper floating washer is smaller than that of the mounting ring groove, and the inner diameter of the upper floating washer is larger than that of the lantern ring. The upper surface of the upper pressure ring is inclined upwards from inside to outside, and the upper surface of the lower pressure ring is inclined upwards from inside to outside.
The stop collar 30 of height-adjusting about the installation can be gone up to the valve rod, and the back pressure intracavity is arranged in to the stop collar, is equipped with between stop collar and the spacer sleeve and opens the interval 31 entirely, and the stop collar can butt on the spacer sleeve. The stop collar threaded connection is on the valve rod, and the stop collar lower extreme is equipped with a plurality of constant head tanks, connects the anti-rotating pin between constant head tank and the valve rod. The lower part of the limiting sleeve on the valve rod is in threaded connection with a retaining sleeve 32, the lower end of the retaining sleeve is attached to the valve clack sleeve, a plurality of positioning grooves are formed in the upper end of the retaining sleeve, and an anti-rotation pin is connected between each positioning groove and the valve rod. The lantern ring threaded connection can be adjusted the height from top to bottom on the valve rod, and the lantern ring upper end is equipped with a plurality of anti-rotating grooves, connects the locating pin between anti-rotating groove and the valve rod, and lantern ring upper end position is equipped with position scale stripe 33 on the valve rod outer wall. The isolating sleeve, the top plate and the top cover are all sleeved with the valve rod.
A valve cover 34 is fixedly mounted on the top cover, the upper end of the valve cover is connected with a valve cap 35, a setting spring 36, an upper spring seat 37, a lower spring seat 38 and an adjusting threaded sleeve 39 are sleeved on the valve rod, a supporting seat 40 is arranged above the scale stripes on the outer wall of the valve rod, the lower spring seat is abutted against the supporting seat, the setting spring is abutted between the upper spring seat and the lower spring seat, the adjusting threaded sleeve is in threaded connection with the valve cover, and the lower end of the adjusting threaded sleeve is abutted against the upper spring seat. The upper end of the valve rod is connected with a shifting fork 41, the valve cover is hinged with a pressure relief handle 42, and the pressure relief handle rotates upwards to abut against the shifting fork to jack up the shifting fork upwards so as to move the valve rod upwards and promote the valve clack to be opened for manual pressure relief.
The opening and closing performance of the ultra-high performance steam safety valve is shown in table 1.
As shown in table 1, due to the high sealing performance of the elastic sealing design, the valve still maintains sealing under 97% of set pressure, 98% starts to leak forwards, and at 100%, due to the combined action of the upper and lower adjusting rings, there is a rapid lifting process, during which the back pressure in the back pressure chamber increases, but the opening between the collar and the lower floating washer is not yet opened, so that it is somewhat disadvantageous to opening, but the rapid opening function in the front is passed quickly, so that the opening height reaches a position where the opening formed by the inclined diversion surface at the lower end of the collar and the lower floating washer gradually increases, at this time, the medium in the back pressure chamber is discharged from the opening formed by the lower end of the collar and the lower floating washer, the back pressure is reduced, the valve flap is raised rapidly, and stable discharge is realized for a while the working pressure is lower than 100%.
In the process, the safety valve is opened, at the moment, a part of steam enters the back pressure cavity through the back pressure taking hole, a part of steam in the back pressure cavity is discharged outwards through the lower air chamber, the vent hole, the upper air chamber and the exhaust port, a part of steam is accumulated in the isolating sleeve, the pressure in the isolating sleeve is increased, when an opening formed by the inclined flow guide surface at the lower end of the lantern ring and the lower floating gasket is gradually enlarged along with the ascending of the valve clack, the part of medium is discharged outwards through the upper air chamber and the exhaust port from the opening, the back pressure is reduced, the valve clack generates two-stage action, and the full opening is further realized. Meanwhile, the lower floating washer is arranged in a floating mode and can move in the radial direction, and the lower floating washer freely moves to reach a dynamic balance state according to different air pressures at various positions on the inner wall of the lower floating washer, so that the obstruction to air flow is reduced, and the steam is favorably and quickly discharged; and the lower floating gasket has certain free movement space in the radial direction, and the lower floating gasket can follow the lantern ring no matter how the valve rod moves, so that any obstruction to the action of the lantern ring is avoided, and the phenomenon of valve rod clamping stagnation at the position is avoided.
When the working pressure begins to drop to about 97%, the valve clack begins to fall back, the process shows a certain slope from the curve, the opening formed by the inclined flow guide surface at the lower end of the lantern ring and the lower floating gasket is gradually reduced, after the gap is completely closed, the medium in the back pressure cavity cannot be discharged from the vent hole, the back pressure rises, and acts on the back surface of the valve clack sleeve to accelerate the seat returning action of the valve clack. The ultrahigh-performance steam safety valve has good seat returning performance and low opening and closing pressure difference.
Example 2: a kind of ultra high performance steam relief valve (refer to the attached figure 3, the attached figure 4, the attached figure 5), its structure is similar to embodiment 1, its main difference lies in the collar outer wall upper and lower floating washer corresponding position equipartition have several increase the trough 43, increase the trough installs the slide block 44, the push pedal 45, the slide block and push pedal stagger to set up, mount the locating spring 46 between slide block and increase trough bottom surface, there are pushing posts 47 on the slide block, there are slopes to set up on the push pedal in pushing the surface 48, the pushing surface slopes to the direction far away from the axis from up to down, the pushing post is laminated on pushing the surface, install the return spring 49 between push pedal and the increase trough, the push pedal upper end has extending arm 50 outside, the increase trough opening position corresponding to push pedal connects the cover plate 51, the cover plate covers the push pedal, there is dodging the trough 52 between upper end of cover, the outer surfaces of the cover plate and the slide block are exposed out of the outer wall of the lantern ring, the outer surface contours of the cover plate and the slide block are matched with the outer wall contour of the lantern ring, a plurality of positioning grooves 53 are formed in the outer surface of the slide block, a plurality of positioning raised heads 54 are correspondingly arranged on the edge of the cover plate and the positioning grooves one by one, and the positioning raised heads are inserted into the positioning grooves in; the extension arm moves up along with the valve rod, after the water conservancy diversion face of lantern ring lower extreme arrived to float down and put the packing ring position, the valve rod continues rebound to make the extension arm butt to the indoor wall of last plenum on, also on the extension arm contacted the roof lower surface to make the push pedal move down for the slider, the promotion face in the push pedal drives the promotion post and moves to increasing the chute bottom surface, makes the slider shrink inwards, increases the chute open end and exposes. A support 55 is arranged above the sliding block at the bottom of the flow increasing groove, a positioning block 56 is arranged at the upper end of the pushing face on the pushing plate, the positioning block is installed between the bottom of the flow increasing groove and the cover plate in an adaptive mode, and the return spring is abutted between the support and the positioning block. The other structure is the same as embodiment 1.
The extension arm is along with valve rod rebound, after the water conservancy diversion face of lantern ring lower extreme reachd lower superficial packing ring position, thereby the valve rod continues rebound makes the extension arm butt make the push pedal move down for the slider on the upper plenum inner wall, thereby the promotion face in the push pedal drives the promotion post and moves to the bottom surface of the flow increasing groove, make the slider shrink inwards, the flow increasing groove open end exposes, thereby increase the through-flow cavity between lower floating packing ring inner wall and the lantern ring outer wall, be favorable to the steam medium of backpressure intracavity to discharge fast, accelerate the full boot speed of valve clack. When the valve rod returns to the seat downwards, the extension arm is separated from the inner wall of the upper air chamber, the extension arm moves upwards to return under the action of the return spring, and the sliding block moves outwards in the radial direction to return under the action of the positioning spring.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to be limiting in any way, and other variations and modifications are possible without departing from the scope of the invention as set forth in the appended claims.
Claims (10)
1. A kind of ultra-high performance steam relief valve, including valve block, valve base, valve stem, valve flap, there are valve cavities in the valve block, the valve base is installed in valve block, the valve flap connects to the lower end of valve stem, the valve flap seals and butts on the upper end of valve base, characterized by, install the guide sleeve in the valve cavity, the upper end of guide sleeve connects with middle cover, top cap sequentially, the lower end of valve stem connects the valve flap sleeve, the valve flap sleeve is fitted in the guide sleeve movably, form the back pressure cavity between valve flap sleeve inner wall and valve stem, the valve flap sleeve lower end has several back pressure; be equipped with the spacer sleeve in with well lid inner chamber and fall into air chamber, lower air chamber, in cover be equipped with the gas vent of last air chamber intercommunication, set up the air vent between last air chamber and the lower air chamber, the cover corresponds the position and connects the lantern ring in the valve rod, lantern ring lower extreme is equipped with the water conservancy diversion face that the slope set up, clamping ring under the installation of spacer sleeve upper surface inward flange, but install radial movement's lower floating packing ring between lower clamping ring and the spacer sleeve, lower floating packing ring suit is on the lantern ring, be equipped with the removal clearance between lower floating packing ring inner wall and the lantern ring outer wall, the water conservancy diversion face is arranged in lower floating packing ring below.
2. The ultra high performance steam relief valve of claim 1 wherein a mounting groove is formed between the lower surface of the inner edge of the lower pressure ring and the spacer sleeve, and the lower floating washer is radially movably mounted in the mounting groove.
3. The ultra-high performance steam safety valve of claim 1, wherein a top plate is mounted between the middle cover and the top cover, an upper compression ring is mounted on the top plate, an upper floating washer capable of moving radially is mounted between the upper compression ring and the top plate, the upper floating washer is sleeved on the lantern ring, and a moving gap is formed between the inner wall of the upper floating washer and the outer wall of the lantern ring.
4. The ultra-high performance steam safety valve of claim 1, wherein the valve rod is provided with a limiting sleeve with an adjustable height, the limiting sleeve is arranged in the back pressure cavity, a full-open distance is arranged between the limiting sleeve and the isolating sleeve, and the limiting sleeve can be abutted to the isolating sleeve.
5. The steam safety valve of claim 1, wherein the collar is screwed onto the valve stem to be adjusted in height up and down, the collar has a plurality of anti-rotation slots at its upper end, the anti-rotation slots are connected with the valve stem by positioning pins, and the outer wall of the valve stem is provided with position scale stripes at the upper end of the collar.
6. The ultra high performance steam safety valve of any one of claims 1 to 5, wherein the valve flap sleeve is provided with a plurality of annular grooves on the outer wall.
7. The steam safety valve of any one of claims 1 to 5, wherein the lower end of the valve flap is of a conical structure, the edge of the valve flap is provided with a sealing convex ring, the inner edge of the sealing convex ring is provided with a sealing lip, the sealing lip is arranged in an inclined manner from top to bottom, the lower end face of the sealing lip is of a planar structure and is in sealing fit with the upper end face of the valve seat; and a pressure gathering groove is formed among the sealing lip, the inner wall of the sealing convex ring and the lower surface of the valve clack.
8. The ultra-high performance steam relief valve of any one of claims 1 to 5, wherein the outer wall of the lower end of the guide sleeve is connected with the upper adjusting sleeve, the outer wall of the upper end of the valve seat is connected with the lower adjusting sleeve, and a pressure accumulation chamber is formed between the upper end of the lower adjusting sleeve and the lower end of the valve flap.
9. The steam safety valve of any one of claims 1 to 5, wherein a plurality of flow-increasing grooves are uniformly formed in the outer wall of the sleeve at positions corresponding to the upper and lower floating washers, a slider and a push plate are installed in each flow-increasing groove, a positioning spring is installed between the slider and the bottom of each flow-increasing groove, a pushing post is arranged on the slider, a pushing surface is obliquely arranged on the push plate, the pushing post is attached to the pushing surface, a return spring is installed between the push plate and the flow-increasing grooves, an extending arm extending outward is arranged at the upper end of the push plate, a cover plate is connected to the opening position of the flow-increasing groove corresponding to the push plate, the cover plate covers the push plate, a relief groove is arranged between the extending arm and the upper end of the cover plate, the outer surfaces of the cover plate and the slider are exposed out of the outer wall of the sleeve, the outer surface, the positioning raised head is inserted into the positioning groove in a matching manner; the extension arm moves up along with the valve rod, after the water conservancy diversion face of lantern ring lower extreme reached lower floating washer position, thereby the valve rod continues the rebound make the extension arm butt move down for the slider on the upper plenum inner wall, thereby the promotion face in the push pedal drives the promotion post and moves to increasing the chute bottom surface, makes the slider shrink inwards, increases the chute open end and exposes.
10. The ultra-high performance steam safety valve of claim 9, wherein a support is disposed above the sliding block at the bottom of the flow increasing groove, a positioning block is disposed at the upper end of the pushing surface of the pushing plate, the positioning block is fittingly installed between the bottom of the flow increasing groove and the cover plate, and the return spring is abutted between the support and the positioning block.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010797466.4A CN111734858B (en) | 2020-08-10 | 2020-08-10 | Ultrahigh-performance steam safety valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010797466.4A CN111734858B (en) | 2020-08-10 | 2020-08-10 | Ultrahigh-performance steam safety valve |
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| CN111734858B CN111734858B (en) | 2022-03-25 |
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| CN201391659Y (en) * | 2009-02-13 | 2010-01-27 | 上海远东高中压阀门有限公司 | Improved safety valve |
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| CN204628664U (en) * | 2014-12-08 | 2015-09-09 | 章华 | A kind of vapor-proof escape structure of steam superpressure safety relief class valve |
| CN204628667U (en) * | 2014-12-08 | 2015-09-09 | 章华 | With the High Temperature High Pressure spring safety valve of thermal compensation and elastic compensating sealing surface |
| CN209494989U (en) * | 2019-02-28 | 2019-10-15 | 杭州华惠阀门有限公司 | A kind of overcritical full-bore type safety valve manufactured |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201391659Y (en) * | 2009-02-13 | 2010-01-27 | 上海远东高中压阀门有限公司 | Improved safety valve |
| CN102052493A (en) * | 2009-11-10 | 2011-05-11 | 北京航天动力研究所 | Steam safety valve with backpressure regulating mechanism and elastic valve clack |
| CN101806371A (en) * | 2010-04-02 | 2010-08-18 | 吴江市东吴机械有限责任公司 | Main steam safety valve |
| CN202302145U (en) * | 2011-11-01 | 2012-07-04 | 罗浮阀门集团有限公司 | High-performance safety valve with backpressure regulating ring |
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| CN111734858B (en) | 2022-03-25 |
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