CN102003556B - Piston-type water hammer resistance and high pressure balance check valve - Google Patents
Piston-type water hammer resistance and high pressure balance check valve Download PDFInfo
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- CN102003556B CN102003556B CN201010542395A CN201010542395A CN102003556B CN 102003556 B CN102003556 B CN 102003556B CN 201010542395 A CN201010542395 A CN 201010542395A CN 201010542395 A CN201010542395 A CN 201010542395A CN 102003556 B CN102003556 B CN 102003556B
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Abstract
The invention relates to a check valve, in particular to a piston-type water hammer resistance and high pressure balance check valve, comprising a valve body and a valve flap; the valve body is provided with an inlet channel, an outlet channel and an accommodating chamber, wherein the accommodating chamber is used for placing the valve flap and gliding the valve flap; a valve cover is arranged at the tail end of the accommodating chamber; and the valve body is also provided with a valve seat hermetically matched with the front end of the valve flap. The check valve is characterized in that the accommodating chamber is divided into a front chamber and a back chamber by the valve flap, wherein the back chamber is a sealed chamber; a bypass pipeline is also arranged outside the valve body; and two ends of the bypass pipeline are respectively connected to the back chamber and the outlet channel. When a reflowing medium occurs, the valve flap glides downwards and closes quickly under the impact of gravity and the reflowing medium; when in gliding downwards, the volume of the back chamber is instantaneously expanded to generate a bigger negative pressure under the condition that the medium is not supplemented in time; because of the traction of the negative pressure, the valve flap closes slowly so as to effectively prevent the phenomenon that the water hammer generated by the check valve destroys pipelines when the check valve is quickly closed, therefore, the service life of the check valve is prolonged.
Description
Technical field
The present invention relates to a kind of safety check, the anti-water attack high-voltage flat weighing apparatus of particularly a kind of piston type safety check.
Background technique
Safety check is in order to guarantee the one-way flow of the medium in the pipeline, and when the pipeline medium took place to flow backwards in some cases, the flap of safety check can be closed apace, thereby prevents that medium from flowing backwards, to guarantee pipeline safety.But in pressure duct; When occurring flowing backwards; The medium back flow pressure of high pressure can make flap close at a terrific speed; This closing velocity that is exceedingly fast can produce powerful " water attack " phenomenon; (water attack is because because the rapid change of velocity in pipes, the liquid momentum that causes
and the mutual conversion of pressure produce, and moment can make pressure be raised to several times of original pressure; Pipeline caused greatly destroys even explode) thus can produce heavy damage to pipeline, and then influence pipeline safety.
Summary of the invention
For fear of or reduce the generation of " water attack " phenomenon, avoid " water attack " phenomenon to produce thereby the present invention provides a kind of flap that when high-pressure medium refluxes, can make safety check more gently to close with the anti-water attack high-voltage flat of piston type that the improves pipeline working life safety check that weighs.
Technological scheme of the present invention is: the anti-water attack high-voltage flat weighing apparatus of a kind of piston type safety check; Include valve body and flap; Valve body is provided with into and out of passage and is used to the holding cavity laying flap and supply the flap slippage, is provided with valve gap in the rear end of holding cavity, on valve body, also is provided with the valve seat that cooperates with the forward end seal of flap; Be characterized in: described flap is separated into front chamber and rear chamber with holding cavity; Wherein rear chamber is an airtight chamber, outside valve body, also is provided with bypass duct, and the two ends of this bypass duct connect rear chamber respectively and go out passage.
On bypass duct, also be connected with modulating valve.
Said modulating valve is preferably stop valve.
Described flap includes the flap body and with cover the piston outside the flap body rear end is set, and this piston cooperates with the rear end slippage of flap body, and described piston external diameter cooperates with the holding cavity motive sealing.
Described piston is connected with flap body rear end through axle sleeve.
The front end of described piston external diameter is established hard seal in alloy coating.
Also be provided with self-tightening sealing mechanism between the rear end of described holding cavity and the valve gap.
Described self-tightening sealing mechanism includes selfsealings seat, selfsealings filler, pressure sealing ring and pendant collet; Described pendant collet and valve body are located by connecting; Described selfsealings base rear end passes pendant collet and is connected with valve gap, and described selfsealings seat external diameter rear end is provided with packing groove, and the front-end face of this packing groove is the inclined-plane; Described selfsealings filler places in this packing groove and the front of selfsealings filler also is the inclined-plane, and pressure sealing ring is located between selfsealings filler and the pendant collet.
Invention has following beneficial effect: when medium back flow occurring; Flap produces the trend that glides and close rapidly under the impact of gravity and reflux medium; Produce a bigger negative pressure under the situation that makes the moment expansion of rear chamber's volume make medium have little time to replenish during downslide; Because the traction lower Disc of negative pressure is closed slowly; Preventing that effectively " water attack " that high-pressure check valve from producing destroys the phenomenon of pipeline when closing rapidly, when effectively having prevented the flap quick closedown impact of sealing surface is destroyed sealability, also prolonged the working life of high-pressure check valve greatly.
Description of drawings
Accompanying drawing 1 is the structural representation of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is described further:
By shown in Figure 1; The embodiment of the anti-water attack high-voltage flat weighing apparatus of a kind of piston type of the present invention safety check includes valve body 1 and flap 2, and valve body 1 is provided with into and out of passage 11,12 and is used to the holding cavity 13 laying flap 2 and supply flap 2 slippages; Be provided with valve gap 6 in the rear end of holding cavity 13; On valve body 1, also be provided with the valve seat 3 that cooperates with the forward end seal of flap 2, described flap 2 is separated into front chamber 131 and rear chamber 132 with holding cavity 13, and wherein rear chamber 132 is an airtight chamber; Outside valve body 1, also be provided with bypass duct 7, the two ends of this bypass duct 7 connect rear chamber 132 respectively and go out passage 12.When medium back flow occurring; Because rear chamber 132 goes out to be provided with bypass duct 7 between the passage 12; A reflux medium part that goes out passage 12 gets into rear chamber 132; Speed that this a part of medium gets into and flow have determined the Negative Pressure Difference size (this negative pressure be meant the pressure of rear chamber 132 be lower than front chamber and the pressure that goes out passage 12) of rear chamber when trend is closed in the main valve clack generation; The big more main valve clack of pressure reduction is closed slow more, can select the flap closing velocity according to the loine pressure of reality when this safety check uses on pipeline, controls realization through the modulating valve in the bypass then; Can avoid the generation of " water attack " phenomenon so fully, guarantee the safe handling of pipeline.
Can know that by figure on bypass duct 7, also be connected with modulating valve 8, this modulating valve 8 is preferably the forged steel stop valve.Through establishing modulating valve 8, can be by the needs of the actual motion pressure of pipeline, the flow of the modulating valve 8 through control bypass duct 7 is controlled the closing velocity of main valve flap, can avoid the generation of " water attack " phenomenon so fully, guarantees the safe handling of pipeline.The modulating valve 8 here can certainly adopt the valve like one type of ball valve, but because this safety check is generally used for the operating mode of high pressure, high-temperature, especially the forged steel stop valve is more suitable therefore to adopt stop valve.
In the present embodiment; Described flap 2 includes flap body 21 and with cover the piston 22 outside flap body 21 rear ends is set; Described piston 22 preferably is connected with flap body 12 rear ends to realize that piston 22 cooperates with the slippage of flap body 21 rear ends through axle sleeve 23, and described piston 23 external diameters cooperate with holding cavity 13 motive sealings.Flap 2 is divided into flap body 21 and piston 22 2 parts; Like this during medium back flow; The flap body 21 that is provided with sealing surface can be moved with comparatively faster speed to closing direction earlier; After waiting to move certain distance, slowly move with flap body 21 by piston 22 again, valve cuts out.The generation of " water attack " phenomenon is avoided or reduced to safety check in close preventing medium back flow the place ahead pipeline or the equipment, so that flap 2 had a buffering before closing fully, comparatively apace simultaneously in the time of so both can making medium back flow.And if flap adopts integrated type; The pressure of rear chamber (its pressure increase also be to supply with gradually through bypass duct by the medium that goes out passage to increase) under specific circumstances so; The area of flap back is bigger, and the pressure of flap will be less, and its travelling speed will be slower; That is to say will be slower at the closing velocity of initial state flap, and this obviously is again disadvantageous.
Because this safety check is generally used for the high-voltage field merging and piston 22 external diameters are that motive sealing cooperates with holding cavity 13, therefore the front end of described piston 22 external diameters is preferably established hard seal in alloy coating 221.Can guarantee working life of sealing like this.
In the present embodiment, also be provided with self-tightening sealing mechanism 4 between the rear end of described holding cavity 13 and the valve gap 6.Described self-tightening sealing mechanism 4 includes selfsealings seat 41, selfsealings filler 42, pressure sealing ring 43 and pendant collet 44; Described pendant collet 44 is located by connecting with valve body 1; Described selfsealings seat 41 rear ends are passed pendant collet 44 and are connected through screw 5 with valve gap 6; Described selfsealings seat 41 external diameter rear ends are provided with packing groove; The front-end face of this packing groove is the inclined-plane, and described selfsealings filler 42 places in this packing groove and the front of selfsealings filler also is the inclined-plane, and pressure sealing ring 43 is located between selfsealings filler 42 and the pendant collet 44.Self-tightening sealing mechanism 4 can make safety check pressure big more, and sealing will be good more, prevents that like this medium from revealing from valve gap.Certainly as the present invention, the sealing at valve gap place also can be adopted alternate manner, and this is not vital for purposes of the invention.
Claims (6)
1. the anti-water attack high-voltage flat weighing apparatus of piston type safety check includes valve body and flap, and valve body is provided with into and out of passage and is used to the holding cavity laying flap and supply the flap slippage; Rear end at holding cavity is provided with jam pot cover; On valve body, also be provided with the valve seat that cooperates with the forward end seal of flap, it is characterized in that: described flap is separated into front chamber and rear chamber with holding cavity, and wherein rear chamber is an airtight chamber; Outside valve body, also be provided with bypass duct; The two ends of this bypass duct connect rear chamber respectively and go out passage, also are provided with self-tightening sealing mechanism between the rear end of described holding cavity and the valve gap, and described self-tightening sealing mechanism includes selfsealings seat, selfsealings filler, pressure sealing ring and pendant collet; Described pendant collet and valve body are located by connecting; Described selfsealings base rear end passes pendant collet and is connected with valve gap, and described selfsealings seat external diameter rear end is provided with packing groove, and the front-end face of this packing groove is the inclined-plane; Described selfsealings filler places in this packing groove and the front of selfsealings filler also is the inclined-plane, and pressure sealing ring is located between selfsealings filler and the pendant collet.
2. the anti-water attack high-voltage flat weighing apparatus of piston type according to claim 1 safety check is characterized in that: on bypass duct, also be connected with modulating valve.
3. the anti-water attack high-voltage flat weighing apparatus of piston type according to claim 2 safety check, it is characterized in that: described modulating valve is a stop valve.
4. the anti-water attack high-voltage flat weighing apparatus of piston type according to claim 1 safety check; It is characterized in that: described flap includes the flap body and with cover the piston outside the flap body rear end is set; This piston cooperates with the rear end slippage of flap body, and described piston external diameter cooperates with the holding cavity motive sealing.
5. the anti-water attack high-voltage flat weighing apparatus of piston type according to claim 4 safety check, it is characterized in that: described piston is connected with flap body rear end through axle sleeve.
6. the anti-water attack high-voltage flat weighing apparatus of piston type according to claim 4 safety check, it is characterized in that: the front end of described piston external diameter is established hard seal in alloy coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010542395A CN102003556B (en) | 2010-11-13 | 2010-11-13 | Piston-type water hammer resistance and high pressure balance check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010542395A CN102003556B (en) | 2010-11-13 | 2010-11-13 | Piston-type water hammer resistance and high pressure balance check valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102003556A CN102003556A (en) | 2011-04-06 |
| CN102003556B true CN102003556B (en) | 2012-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010542395A Active CN102003556B (en) | 2010-11-13 | 2010-11-13 | Piston-type water hammer resistance and high pressure balance check valve |
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| Country | Link |
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| CN (1) | CN102003556B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105020442B (en) * | 2015-07-03 | 2017-12-01 | 南通国电电站阀门有限公司 | The bypass of Y shape high pressure belt plus the hard self sealss check-valves of pipe arrangement |
| CN105782524B (en) * | 2016-05-03 | 2018-11-20 | 孙留红 | pressure limiting valve |
| CN105864468A (en) * | 2016-05-19 | 2016-08-17 | 南通国电电站阀门股份有限公司 | Ultra-supercritical tape bypass spherical sealing check valve |
| JP7068500B2 (en) * | 2020-01-31 | 2022-05-16 | 株式会社イシザキ | Check valve |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5390700A (en) * | 1992-12-23 | 1995-02-21 | Hoerbiger Ventilwerke Aktiengesellschaft | Automatic valve |
| CN201318488Y (en) * | 2008-11-27 | 2009-09-30 | 上海明珠阀门制造有限公司 | Hydraulic control valve |
| CN201589005U (en) * | 2009-09-30 | 2010-09-22 | 河南开封高压阀门有限公司 | Valve with reinforced-type self-sealing structure |
| CN201844069U (en) * | 2010-11-13 | 2011-05-25 | 宣达实业集团有限公司 | Piston type water impact preventing and high-pressure balancing check valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006266470A (en) * | 2005-03-25 | 2006-10-05 | Hitachi Ltd | Check valve |
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2010
- 2010-11-13 CN CN201010542395A patent/CN102003556B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5390700A (en) * | 1992-12-23 | 1995-02-21 | Hoerbiger Ventilwerke Aktiengesellschaft | Automatic valve |
| CN201318488Y (en) * | 2008-11-27 | 2009-09-30 | 上海明珠阀门制造有限公司 | Hydraulic control valve |
| CN201589005U (en) * | 2009-09-30 | 2010-09-22 | 河南开封高压阀门有限公司 | Valve with reinforced-type self-sealing structure |
| CN201844069U (en) * | 2010-11-13 | 2011-05-25 | 宣达实业集团有限公司 | Piston type water impact preventing and high-pressure balancing check valve |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2006-266470A 2006.10.05 |
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| CN102003556A (en) | 2011-04-06 |
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