CN202493716U - Four-function water-hammer resistant air valve set - Google Patents

Abstract

The utility model discloses a four-function water-hammer resistant air valve set, which comprises a negative pressure suction valve, a microscale vent valve and a high-speed vent valve and a control isolation valve. The high-speed vent valve is connected to the top of the negative pressure suction valve through the control valve. The high-speed vent valve and the negative pressure suction valve are separately arranged instead of being configured into one valve. On one hand, for independent selection, requirements of high-speed venting and high-speed suction on two different quantities of flow or velocities or diameters are respectively satisfied; and on the other hand, for superimposed suction, the valves all suck to complement each other at negative pressure, and with the independence of the three orifices, the high-speed suction orifice and the microscale vent orifice form an air injection microscale vent valve (namely a high suction microscale vent valve). Therefore, the valve set has a special function of inhibiting water hammer of cavities. The utility model has the following main contents: the function that the three orifices are independent of each other; the function that the high-speed vent orifice can be cut out and then unlatched due to the arrangement of a control isolating valve; the function that the rear two functions are combined to form a special effect; and the function that the high-speed vent orifice can be greatly reduced.

Description

A kind of four functions are prevented water hammer air valve group

Technical field

The utility model relates to a kind of air valve, relates in particular to the air valve group that a kind of independence three functions add special complex function, and three standalone features of air valve are meant: the high speed exhaust, high speed is air-breathing and micro-exhaust; Specific function is meant the complex function of the air-breathing and micro-exhaust of high speed, has and suppresses the special efficacy that cavity makes water hammer up.

Background technique

What existing normal air valve adopted is that high speed relief opening and high speed intakeport are same aperture, can not independent type selecting, and common high speed exhaust port bore is bigger than normal usually; And the suction port bore is less than normal relatively; Gettering quantity is obviously not enough, and negative pressure value is higher, and micro-vent ports is single, less than normal; Have only one to be of a size of 1.6mm, can't satisfy bassoon trace exhaust demand.

When pipeline or the container water-filling first time, the exhaust of high speed vent ports high speed, the place, aperture can produce certain gas differential pressure; When pressure reduction reached 2kPa～30kPa, the ball float of common composite exhaust valve all can be blown afloat come-up by high velocity air, blocks the big aperture of high speed exhaust; Thereby make high-speed exhaust valve stop the high speed exhaust in advance, its consequence is: most of gas is not discharged in pipeline or the container, and pipeline or container exhaust are not thorough; Water-filling fully; Half water, half gas has a strong impact on pipeline emptying effectiveness or container filled water amount, thereby initiation pressure is unstable, alternately contact steam and cause wall erosion, inaccurate or the like the problem of metering.

After the big aperture of common composite exhaust valve is blown in advance and is blocked up; Iff relies on micro-vent ports and gets rid of remaining high capacity gas, needs long time, will prolong pipeline or first filling time of container significantly; The serious working efficiency that reduces; Long distance line even possibly need 1～2 month ability to accomplish water-filling, this influences particularly great for the northern area that has only very short summer.

Gas differential pressure when reducing aperture high speed exhaust tends to the high speed vent ports of design Selection oversized dimensions; Also because exhaust with air-breathing be same aperture and defective that can not independent type selecting, in order to satisfy the air-breathing requirement to port size of high speed simultaneously, common high speed vent ports can be selected excessive 2～4 grades.Its consequence possibly be: orifice differential has reduced, but simultaneously the air resistance during water-filling has also reduced, and causes water-filling speed excessive; When quick water-filling just, current arrive the big aperture of air valve, can float ball float fast; Close the aperture, stop current, cause possible exhaust valve close valve water hammer (Δ h=a* Δ V/g; The water hammer Δ h that boosts is directly proportional with change in flow amount Δ V); Thereby the initiation booster, this is exactly one of real causes of many water-filling boosters in fact: outlet valve high speed vent ports is excessive, rather than not exhaust of outlet valve; The driving type high-speed exhaust valve then can be for water-filling provides suitable back pressure and water-filling speed, thereby avoids exhaust valve close valve water hammer.

The model utility content

The problem that the utility model will solve provides a kind of have air-breathing, the micro-exhaust of high speed exhaust, high speed of independent three functions and the air valve group of back two function specific combination; And; These three independently function can combination in any, thereby makes this air valve group can satisfy the ventilation problem under the various situation in the water circuit system, especially safety protection problem under the unusual water hammer situation ought take place.

For addressing the above problem; The utility model is realized through following technological scheme: a kind of four functions are prevented water hammer air valve group; This air valve group is installed on water transport pipeline or the container, its high speed vent ports by control separating valve control separately, with the air-breathing aperture of high speed separate the setting but not shared each other; Both allow independent type selecting, satisfied high speed exhaust and air-breathing two the different flows of high speed or speed or bore requirement respectively; The gettering quantity that also can superpose comprises,

A, high-speed exhaust valve; It is positioned at the top of negative inspiratory pressure valve, is connected with the negative inspiratory pressure valve through the control separating valve, and it comprises valve body, valve gap, first ball float and high speed vent ports etc.; When pipeline or container need water-filling; The high speed vent ports provides an amount of (neither too small also non-excessive) the high speed venting capacity and the water-filling speed of pilot line, and progress is smoothly to pipeline or container water-filling according to plan, and its independence allows the design engineer to select the high speed vent ports of suitable dimension arbitrarily for use.

B, negative inspiratory pressure valve; It comprises the flap etc. of valve body, valve gap, the air-breathing aperture of high speed and band Regulation spring; In pipe, produce negative pressure, pushing away flap on the external atmospheric pressure, to open the air-breathing aperture of high speed in time air-breathing, tonifying Qi in managing; Make not produce vacuum environment in the pipe or make degree of vacuum drop to a very low value, its independence allows the design engineer to select the air-breathing aperture of high speed of suitable dimension arbitrarily for use.

C, micro-outlet valve directly are fixedly connected on the opposite side that Aspirating valves pushes up, and comprise valve body, valve gap, second ball float, lever system and micro-vent ports etc., and said micro-vent ports is in time with outside the air discharge tube that discharges in the water.

The suggestion of the about 1foot/s=0.3m/s of the initial water-filling speed of pipeline that recommends according to related standards and rules; In conjunction with the high speed vent ports can independent type selecting characteristics; Patent art (independent aperture and be not afraid of and blow stifled characteristic) allows the high speed vent ports of design Selection than suction port young many (common 2～5 grades of caliber sizes), thereby significantly reduces the size of high-speed exhaust valve.

First ball float (one of flap) is set in the said high-speed exhaust valve; There is guide rod its lower end, allows ball float to move up and down and changes high speed vent ports area of passage, is not afraid of to blow stifled characteristic and allow in pipe, to set up higher and suitable gas pressure; The back pressure resistance that water column advances when making it to become water-filling; Thereby reduce the water-filling speed of water column automatically and suitably, and make it the numerical value that reaches suitable, make the both not too slow and procrastination of time of water filling process; Also water-filling does not cause possible pass valve water hammer and booster too soon, guarantees pipeline or the container smooth water-filling of progress according to plan.

After necessary position can artificially cut off the control valve on the high-speed exhaust valve arm, when the water column backflow that separates was made up again, the gas in the pipe can not be discharged at a high speed; And can only discharge lentamente via micro-outlet valve (bore is very little); Thereby hold back most of air temporarily, form provisional elastic bag, buffering is made the Impact energy of water column up; Reduce water column and make acceleration up; Suppressing cavity and make water hammer up and boost, is a kind of novel and effective negative pressure water-hammer arrester, the ratio that passes in and out the orifice diameter of air reaches 2: 1～and 200: 1; The ratio that just passes in and out area reaches 4: 1～and 40000: 1, constitute " the little valve of gas injection " perhaps " high inhale little valve " on the complete meaning.

The breather port of three standalone features allows three functions to use separately or combination use (multiple compound mode is arranged) respectively, perhaps opens different functions in the different time occasion, thereby satisfies any ventilation requirement of water circuit system.

Said micro-outlet valve allows to select the micro-outlet valve aperture size of plurality of specifications, the virtually any size between from 1.0mm to 12.7mm.

Regulate terminal stud or change flap weight, just can change negative pressure unlatching value, regulation range is greatly about-90,000Pa～-10Pa (gauge pressure) between, common negative pressure unlatching value scope should be-3,000Pa～-500Pa between.

Towards mo(u)ld bottom half up attraction type intakeport structure, be inhaled into aqueduct thereby can reduce even avoid dust to pile up significantly at valve port, reduce contamination by dust, avoid reducing water supply quality.

Inner gas storage structure can effectively prevent cryogenic freezing spalling valve body.

0 type circle sealing valve port form in the dovetail groove forms metal hard-sealing+rubber sealing two-layer compound seal form, and the top-opening type structure allows air valve valve group on-line maintenance.

Adopt technique scheme, compared with prior art, the advantage that the utility model had is following:

1, the utlity model has three independently breather port; The size design type selecting in each aperture can both independently be carried out; Thereby overcome common composite exhaust valve owing to adopt same high speed exhaust and shortcoming that the air-breathing aperture of high speed can not independent type selecting; Generally, the high speed air displacement is not the bigger the better, and that is to say that the high speed vent ports is not the bigger the better; And the high speed gettering quantity is to be the bigger the better, and the two is a contradiction.

2, according to Chinese engineering construction standard CECS193:2005 " urban water supply Long-distance Pipeline for Water Conveyance engineering rules " 7.1.2 bar about the requirement of " during the pressure water pipe water-filling, should control water-filling speed and be not more than 0.3～0.5m/s "; And the AWWA M51 of U.S. water channel association " about the guide for use of water supply project air valve " recommends the suggestion of the about 1foot/s=0.3m/s of the initial water-filling speed of pipeline; In conjunction with the high speed vent ports can independent type selecting characteristics; Patent art allows the high speed vent ports of design Selection than suction port young many (common 2～5 grades of caliber sizes), thereby significantly reduces the size of high-speed exhaust valve.Usually not independently the high speed air inlet and exhaust valve must take into account high speed exhaust and air-breathing the two requirement of high speed, and high speed intakeport footpath is often many greatly than high speed exhaust diameter, this is a long-standing technical barrier of also not captured.

3, said high-speed exhaust valve adopts aerodynamics high speed venting principleand; Its high speed vent ports can not produce blow stifled; Therefore allow high speed exhaust under higher aperture gas differential pressure; In pipe, set up higher and suitable gas pressure, the back pressure that water column advances when making it to become water-filling, thus automatically and suitably reduce water-filling speed.Make the both not too slow and procrastination of time of water filling process, also water-filling is too fast and do not cause possible pass valve water hammer and booster, guarantees pipeline or the container smooth water-filling of progress according to plan.Both reduce bore, saved initial investment, helped first water-filling again, reduced the booster probability.

4, after accomplishing the first water-filling of pipeline, the hand control valve on the high-speed exhaust valve arm can cut out separately, and does not influence air-breathing and the micro-degassing function of high speed (if need not close, also can not be provided with and control separating valve).Like this; Just can be in running; Separate when water column occurring/when making up; Do not allow the high speed exhaust and hold back air bag, utilize the elasticity of this air bag of temporarily holding back to suppress cavity and make water hammer-be the negative pressure water hammer up or be referred to as very water hammer, have the function that replaces surge shaft, surge tower or water attack barometric tank.Promptly owing to have independence, can close one of them function, and let other two function combinations, make the special effect that water hammer boosts up thereby realize suppressing cavity.Certainly, (like pipeline water-filling again) when being necessary, the hand control valve on the high-speed exhaust valve arm also can be opened again, and control is flexibly.This hand control valve both can be ball valve, gate valve, the stop valve of small-bore threaded coupling, also can be butterfly valve, gate valve or the stopcock of bigbore flange, wafer type and lug formula interface, even all kinds of control valves of clip interface or the like.

5, the utility model allow to be selected the micro-outlet valve aperture size of plurality of specifications: from 1.6mm, 2.4mm, 3.2mm, 4.8mm, 5.6mm to large-sized 9.5mm, 12.7mm, 25mm or the like; Select suitable micro-vent ports according to design discharge; Guarantee that pipeline has suitable micro-venting capacity, both improved the pipeline emptying effectiveness, reduce the water delivery energy consumption; Reduce the repeated construction investment, energy-saving and cost-reducing; Help again selecting suitable air inlet/outlet mouth diameter (or area) ratio, effectively suppress cavity and make water hammer (negative pressure water hammer or very water hammer) up.

6, negative pressure unlatching value can be regulated: secondary spring is enclosed within on the central outlet pipe; Regulate terminal stud or change flap weight; Just can change negative pressure unlatching value; Regulation range greatly about-90kPa～-10Pa (gauge pressure) between, common negative pressure unlatching value scope should-3000Pa～-500Pa between.

7, towards mo(u)ld bottom half up attraction type intakeport structure, bring following advantage: be inhaled into aqueduct thereby reduce even avoid dust to pile up, reduce contamination by dust, avoid reducing water supply quality at valve port.The intakeport of common composite exhaust valve all is up, possibly pile up countless dusts year in year out.When air-breathing, a large amount of dusts inevitably are inhaled into pipeline when downward, and polluted-water reduces water quality; The air-breathing function that also possibly can not bring into normal play because air-breathing aperture is stopped up by dust.

8, inner gas storage structure prevents cryogenic freezing spalling valve body: the connection mouth of micro-exhaust is positioned at lower position of Aspirating valves; To allow the part air to remain in valve body of main valve top and get rid of without micro-outlet valve; The space of volumetric expansion when reserving ice up in winter guarantees that the outlet valve group is not easy to be frozen freezing.

9, O type circle sealing valve port form in the dovetail groove: metal hard-sealing adds the dual compound seal form of rubber sealing, can under low pressure seal means of press seals in also guaranteeing.

10, can on-line maintenance.

Description of drawings

Fig. 1 is first kind of project organization outline drawing of the utility model;

Fig. 2 is first kind of project organization sectional view of the utility model;

Fig. 3 is the utility model oat tail groove structure sectional view;

Fig. 4 is second kind of project organization sectional view of the utility model;

Fig. 5 is the third project organization sectional view of the utility model;

Fig. 6 is the 4th kind of project organization sectional view of the utility model;

Fig. 7 is the 5th kind of project organization sectional view of the utility model;

Fig. 8 is the 6th kind of project organization sectional view of the utility model.

Embodiment

With reference to accompanying drawing 1, Fig. 2, Fig. 3, the utility model is done further detailed description through following mode of execution:

A kind of four functions are prevented water hammer air valve group (also can be referred to as independent three function composite exhaust valves); Comprise negative inspiratory pressure valve 1, micro-outlet valve 2 and high-speed exhaust valve 3 and control separating valve 4; High-speed exhaust valve 3 is connected the top of negative inspiratory pressure valve 1 through control separating valve 4; Negative inspiratory pressure valve 1 is connected in waterline T type neck interface, and micro-outlet valve 2 is connected on the top cover of negative inspiratory pressure valve 1.

Embodiment one: as shown in Figure 2; When the pipeline water-filling first time; Water flows in pipeline, and water column extruding inner air tube produces pressure, and inner air tube is flowed fast by the current extruding and sets up air pressure; Outside the port and tube wall perforate, control separating valve 4 and the quick discharge tube of high speed vent ports through the Aspirating valves conduit, the current in the pipe pass through pipeline smoothly; By means of aerodynamic principle; First ball float 6 of high-speed exhaust valve in orifice differential is 35kPa～89kPa (subsonic velocity) scope, be not afraid of blow stifled (be not afraid of more than the 89kPa yet blow stifled; But the air pressure usually during water-filling to not this high value); Therefore, suitably improve orifice differential (generally being lower than 35kPa) when allowing water-filling, and this pressure reduction has just constituted the back pressure resistance when water column advances; Water-filling speed just reduces (general water-filling speed is not more than 0.3m/s) naturally, thereby realizes low speed (and right fast) water-filling, avoid booster and safe water-filling; If be considered to produce the position that water column makes up at some; After in pipeline, being full of water, artificial closing control separating valve 4 (let this air valve consist of only to have back two functions compound special " the little valve of gas injection " or be referred to as " high inhale little valve "); Water-filling then can be opened separating valve again for the second time if desired; According to Chinese engineering construction standard CECS193:2005 " urban water supply Long-distance Pipeline for Water Conveyance engineering rules " 7.1.2 bar about the requirement of " during the pressure water pipe water-filling; should control water-filling speed and be not more than 0.3～0.5m/s "; And the suggestion of the about 1foot/s=0.3m/s of the initial water-filling speed of pipeline of the AWWA M51 of U.S. water channel association " about the guide for use of water supply project air valve " recommendation; In conjunction with the high speed vent ports can independent type selecting characteristics; Patent art (independent aperture and be not afraid of and blow stifled characteristic) allows to select the high speed vent ports than suction port young many (common 2～5 grades of caliber sizes) for use, thereby significantly reduces the size of high-speed exhaust valve.Usually not independently the high speed air inlet and exhaust valve must take into account high speed exhaust and air-breathing the two requirement of high speed, and high speed intakeport footpath is often many greatly than high speed exhaust diameter.This is a long-standing technical barrier of also not captured, and its independence allows the design engineer to select the high speed vent ports (not being the bigger the better) of suitable dimension arbitrarily for use.

Embodiment two: as shown in Figure 2, when pipeline current proper flow, outside the air discharge tube that said micro-vent ports discharges in time with water under pressure state; The gas that is discharged in the current gets into the cavity of micro-outlet valve 2 through the top of Aspirating valves; Gas in the cavity increases gradually, causes drawdown in the micro-outlet valve valve, when drawdown to second ball float 9 during with upper/lower positions; Second ball float 9 falls; Drive lever assembly, open micro-vent ports, intermittently get rid of the air that accumulates in the valve body; Said micro-outlet valve 2 set inside simple levers or double lever assembly; This double lever assembly is the gravity (being micro-aperture opening force) of (several times to tens times ground) amplification ball float significantly; Thereby can improve the working pressure of micro-exhaust or the port size (being extraction flow) of micro-exhaust; And allow to select the micro-outlet valve aperture size of plurality of specifications: to large-sized 9.5mm, 12.7mm or the like, 25mm (PN10) can be accomplished in maximum aperture from 1.6mm, 2.4mm, 3.2mm, 4.8mm, 5.6mm; Select suitable micro-vent ports according to design discharge, guarantee that pipeline or container have suitable micro-venting capacity, both improved the pipeline emptying effectiveness, reduce the water delivery energy consumption, reduce the repeated construction investment, energy-saving and cost-reducing; Help again selecting suitable air inlet/outlet mouth diameter (or area) ratio, effectively suppress cavity and make water hammer (negative pressure water hammer or very water hammer) up.

Embodiment three: as shown in Figure 2, when termination of pumping suddenly, throttle down or booster, the water column of some position possibly be separated from each other in the pipe; Occur vacuum (negative pressure) in the pipe, outside pressure is greater than internal pressure at this moment, and Aspirating valves internal flap 8 is pushed by ambient air pressure; Promote to move on the flap 8; Suction port is opened, and air passes through the air-breathing aperture 7 of high speed of Aspirating valves from getting into fast all around, makes the interior negative pressure of pipe drop to minimum; To guarantee the Security of pipe-line system pipe fitting and sealed interface, its independence allows the design engineer to select the air-breathing aperture of high speed (being the bigger the better usually) of suitable dimension arbitrarily for use.

Embodiment four: as shown in Figure 2, when water column was driven perhaps because of gravity reflux by water pump, the water column in the pipe of said position began to make up; Block because the high speed vent ports is cut off by separating valve, the gas in the pipe can not be discharged at a high speed, and can only discharge lentamente through micro-outlet valve (aperture is very little) is arranged; Most of gas between the water column is trapped in the pipe temporarily, forms interim elastic bag, and water column makes brief acceleration up and is lowered; Impact force is cushioned by elastic bag; Thereby significantly cut down the Impact energy that makes water column up, effectively suppressed to make up water hammer and boosted, guaranteed pipeline safety; The diameter ratio of air-breathing aperture and micro-vent ports reaches 2: 1～and 200: 1, the ratio of orifice area reaches 4: 1～and 40000: 1; Usually, the ratio of area reaches 25: 1 above (being that diameter ratio reaches more than 5: 1) just can be referred to as " the little valve of high suction ", perhaps is " the little valve of gas injection ", just has preventing or suppresses the effect that cavity makes water hammer up.

Embodiment five: as shown in Figure 2; Regulate negative pressure unlatching value: Regulation spring 5 is enclosed within on the central outlet pipe; Regulate terminal stud or change flap weight; Just can change negative pressure unlatching value, regulation range greatly about-90kPa～-10Pa (gauge pressure) between, common negative pressure unlatching value scope should-3000Pa～-500Pa between.Different negative pressure unlatching values possibly need the spring of different stage and the flap combination of Different Weight to realize.

Embodiment six: as shown in Figure 2, avoid dust to suck: the intakeport structure is inhaled into aqueduct for being designed to towards the mo(u)ld bottom half up attraction type thereby can reduce even avoid dust to pile up at valve port significantly, reduces contamination by dust, avoids reducing water supply quality.

Embodiment seven: as shown in Figure 2, embedded anti-freezing structure: inner gas storage structure can effectively prevent cryogenic freezing spalling valve body.The connection mouth of trace exhaust is positioned at lower position of internal surface under the Aspirating valves valve gap; To allow the part air to remain in valve body of main valve top and get rid of without micro-outlet valve; The space of volumetric expansion when reserving ice up in winter guarantees that outlet valve is not easy to be frozen freezing.

Embodiment eight: as shown in Figure 3, O type circle sealing valve port form in the dovetail groove: metal hard-sealing adds the dual compound seal form of rubber sealing, can under low pressure seal means of press seals in also guaranteeing.

Embodiment nine: like Fig. 1, shown in Figure 2, vitals mainly concentrates on the valve gap, open valve gap after, can on-line maintenance.

Embodiment ten: to shown in Figure 8, Fig. 4 to Fig. 8 is the structure sectional view of negative inspiratory pressure valve 1, micro-outlet valve 2 and high-speed exhaust valve 3 and control separating valve 4 diverse locations like Fig. 4;

As shown in Figure 4, micro-outlet valve 2 is arranged on the side of negative inspiratory pressure valve 1, and is middle with manually operated valve 41 connections.

As shown in Figure 5; High-speed exhaust valve 3 is arranged on the side of negative inspiratory pressure valve 1 through control separating valve 4; Trace outlet valve 2 also is arranged on the side of negative inspiratory pressure valve 1, and its high-speed exhaust valve 3 and micro-outlet valve 2 be not in the same side, and micro-outlet valve 2 connects negative inspiratory pressure valves 1 through manually operated valve 41.

As shown in Figure 6, high-speed exhaust valve 3 is through controlling the top that separating valve 4 is connected negative inspiratory pressure valve 1, and micro-outlet valve 2 is connected on the top cover of negative inspiratory pressure valve 1 through manually operated valve 41.

As shown in Figure 7, high-speed exhaust valve 3 is through controlling the side that separating valve 4 is arranged on negative inspiratory pressure valve 1, and micro-outlet valve 2 is connected on the top cover of negative inspiratory pressure valve 1 through manually operated valve 41.

As shown in Figure 8, high-speed exhaust valve 3 is through controlling the top that separating valve 4 is connected negative inspiratory pressure valve 1, and micro-outlet valve 2 is connected on the pipeline of high-speed exhaust valve 3.

Claims (5)

1. a function is prevented water hammer air valve group; This air valve group is installed on water transport pipeline or the container; Its high speed vent ports is by control separating valve (4) control separately; Separate to be provided with but not shared each other with the air-breathing aperture of high speed, both allowed independent type selecting, satisfy high speed exhaust and air-breathing two the different flows of high speed or speed or bore requirement respectively; The gettering quantity that also can superpose is characterized in that: comprises,

A, high-speed exhaust valve (3); It is positioned at the top of negative inspiratory pressure valve (1); Be connected with negative inspiratory pressure valve (1) through control separating valve (4), it comprises valve body, valve gap, first ball float (6) and high speed vent ports, when pipeline or container need water-filling; The high speed vent ports provides the water-filling speed of high speed venting capacity and pilot line, and progress is smoothly to pipeline or container water-filling according to plan;

B, negative inspiratory pressure valve (1); It comprises the flap (8) of valve body, valve gap, the air-breathing aperture of high speed (7) and band Regulation spring (5), in pipe, produces negative pressure, and it is in time air-breathing to push away the air-breathing aperture of flap (8) unlatching high speed on the external atmospheric pressure; Tonifying Qi in pipe makes and does not produce vacuum environment in the pipe;

C, micro-outlet valve (2) directly are fixedly connected on the opposite side that Aspirating valves pushes up, and comprise valve body, valve gap, second ball float (9), lever system and micro-vent ports, and said micro-vent ports is in time with outside the air discharge tube that discharges in the water.

2. four functions according to claim 1 are prevented water hammer air valve group; It is characterized in that: first ball float (6) is set in the said high-speed exhaust valve (3); There is guide rod its lower end, allows ball float to move up and down and changes high speed vent ports area of passage, the back pressure resistance that water column advances when making it to become water-filling; Thereby reduce the water-filling speed of water column automatically and suitably; Make the both not too slow and procrastination of time of water filling process, also water-filling is too fast and do not cause possible pass valve water hammer and booster, guarantees pipeline or the container smooth water-filling of progress according to plan.

3. four functions according to claim 1 are prevented water hammer air valve group, it is characterized in that: after can artificially cutting off the control valve on the high-speed exhaust valve arm, when the water column backflow that separates is made up again; Gas in the pipe can not be discharged at a high speed; And can only discharge lentamente via micro-outlet valve, thereby hold back most of air temporarily, form provisional elastic bag; Buffering is made the Impact energy of water column up; Reducing water column and make acceleration up, suppress cavity and make water hammer up and boost, the ratio of the orifice diameter of turnover air reaches 2: 1～and 200: 1; The ratio that just passes in and out area reaches 4: 1～and 40000: 1, constitute " the little valve of gas injection " perhaps " high inhale little valve " on the complete meaning.

4. four functions according to claim 1 are prevented water hammer air valve group; It is characterized in that: the breather port of three standalone features; Allow three functions to use separately or combination use respectively; Perhaps open different functions, thereby satisfy any ventilation requirement of water circuit system in the different time occasion.

5. four functions according to claim 1 are prevented water hammer air valve group, it is characterized in that: said micro-outlet valve (2) allow to be selected the micro-outlet valve aperture size of plurality of specifications, the virtually any size between from 1.0mm to 12.7mm.

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