CN108223867A - A kind of Depressure valve - Google Patents
A kind of Depressure valve Download PDFInfo
- Publication number
- CN108223867A CN108223867A CN201711450179.0A CN201711450179A CN108223867A CN 108223867 A CN108223867 A CN 108223867A CN 201711450179 A CN201711450179 A CN 201711450179A CN 108223867 A CN108223867 A CN 108223867A
- Authority
- CN
- China
- Prior art keywords
- valve
- pressure
- pressure reducing
- reducing valve
- venturi tube
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
-
- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
-
- 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
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The invention discloses a kind of Depressure valves, including pressure reducing valve main valve, pressure reducing valve main valve is equipped with control chamber and decompression pilot valve, the utility model pressure reducing valve further includes Venturi tube, Venturi tube is connected to the output terminal of pressure reducing valve main valve, shrinkage cavity is equipped between the reaming at two end of Venturi tube, the tube wall of shrinkage cavity is equipped with the low pressure delivery outlet of a radial direction, and low pressure delivery outlet is connected with depressurizing the feed back input hole of pilot valve.The present invention can voluntarily adjust output pressure according to by the flow of pressure reducing valve, average output pressure is greatly reduced, avoids no matter pipeline is using peak, paddy period to bear high pressure always, reduces the leak of pipe-line system and booster probability, energy saving, resource reduces maintenance cost.
Description
Technical field
The present invention relates to a kind of control device of pressure reducing valve output pressure, more specifically, it relates to a kind of Novel pressure-reducing
Valve.
Background technology
When the high pressure water in outdoor water supply pipe net depressurizes backward building using pressure reducing valve to supply water, the hydraulic pressure after decompression must
It must ensure in water use peak, the use water of farthest, highest or other least favorable water distribution points, this hydraulic pressure includes：Highest water distribution point
Geometric height hydraulic pressure P1；Max-flow Water outlet hydraulic pressure P needed for each water distribution point2；Open the water needed for the valves such as backflow preventer
Press P3；The sum of computer tube road frictional head loss and local head loss P4；Water flow through it is total, divide the valves such as water meter and filter
Head loss P5Deng.Since the fluctuation of water consumption in one day is very big, when water use peak, the flow velocity of water is very high in pipeline, according to water
Power calculation formula, P4、P5It is square directly proportional to flow velocity, so P4max+P5max＞ ＞ P4min+P5min.As described above, in order to
The water consumption of least favorable point is guaranteed during water peak, it should be ensured that output pressure P >=P after pressure reducing valve decompression1+P2+P3+P4max+
P5max.As shown in Figure 1, common pressure reducing valve control output pressure P2Principle be that medium is from the water inlet warp knuckle of pressure reducing valve main valve 1
It flows needle-valve 10 and enters control chamber 14,11 inductive output pressure P of decompression pilot valve2.Work as P2It is increased beyond the setting of decompression pilot valve 11
During value, the valve port Slow Close of pilot valve 11 is depressurized, 14 pressure of control chamber rises, pressure reducing valve valve port of main valve V Slow Closes, output pressure P2With
Be reduced to decompression pilot valve 11 setting value；Work as P2During less than the setting value for depressurizing pilot valve 11, the valve of pilot valve 11 is depressurized
Mouth is slow to be opened, and the pressure in release control chamber 14, pressure reducing valve valve port of main valve V delays out, output pressure P2Decompression guide is risen to therewith
The setting value of valve 11 so ensures that the output pressure of pressure reducing valve remains unchanged.It depressurizes the operation principle of pilot valve 11 and commonly may be used
The operation principle of mode pressure reducing valve is identical, and to adjust the output pressure of pressure reducing valve, shut-off valve 15 is always when pressure reducing valve works
It opens.As it can be seen that the structure of common pressure reducing valve can guarantee that output pressure is kept substantially when inlet pressure or flow change
It is constant, therefore when total water consumption is at a low ebb, pipe-line system has been also subjected to this high hydraulic pressure, and which adds pipeline systems
System, the especially leak of low layer pipeline and valve and booster probability bear that hydraulic pressure is higher, and water leakage is bigger, and booster probability is higher.
There is data introduction, water leakage typically constitutes from more than 20% total water consumption, not high or using with the passing of time for material, installation quality
Pipeline, water leakage are even up to more than the 40% of total water consumption, this not only waste of energy, resource, but also increase maintenance cost.Therefore
The national regulations of " Code for design of building water supply and sewerage ", the hydrostatic pressure of minimum water distribution point are not preferably greater than 0.45MPa.Therefore having must
How study makes the output pressure of pressure reducing valve be suitably adjusted automatically according to output flow, and avoiding pipeline, no matter flow is big
It is small to bear high pressure always, so as to reduce leak and booster probability.
Invention content
Existing pressure reducing valve can only carry out output pressure control by presetting pressure value, and the height of output pressure can not
Change with uninterrupted, lead to no matter pipe-line system in peak, paddy period bears high pressure always, to overcome this defect, this hair
It is bright to provide a kind of output pressure for making pressure reducing valve and change with flow, average output pressure is significantly reduced, reduces pipeline system
The Depressure valve of the probability of system leak and booster.
The technical scheme is that：A kind of Depressure valve, including pressure reducing valve main valve, pressure reducing valve main valve is equipped with control
Chamber and decompression pilot valve, further include Venturi tube, Venturi tube is connected to the output terminal of pressure reducing valve main valve, and Venturi tube two is defeated
Shrinkage cavity is equipped between reaming, the tube wall of shrinkage cavity is equipped with the low pressure delivery outlet of radial direction, the pressure of low pressure delivery outlet and decompression pilot valve
Force feedback input hole connects.The utility model pressure reducing valve is designed to solve the deficiency of common pressure reducing valve, in common pressure reducing valve
The port of export connected a Venturi tube, when flow changes, the change of bigger can occur for flow velocity and pressure at shrinkage cavity
Change, control pilot valve is removed using the variation of this pressure, so as to achieve the purpose that control pressure reducing valve output pressure.That is, this hair
The feedback signal of bright control pressure reducing valve output pressure be not output pressure in itself, but the flow of pressure reducing valve is defeated when flow is big
It is just high to go out pressure；Flow hour, with regard to low, output pressure changes output pressure with flow.In this way, average output pressure substantially drops
It is low, the probability of pipe-line system leak and booster is reduced, has not only saved the energy, resource, but also reduce maintenance cost.
Preferably, the reaming be all provided with the portion of being connected of shrinkage cavity it is tapered.Reaming sets taper with the portion of being connected of shrinkage cavity
The fluid for flowing through caliber change position can be guided into row buffering, to reduce flow resistance to the maximum extent.
Preferably, the tube wall of the output terminal reaming of Venturi tube is equipped with the detection hole of radial direction, detection hole passes through cut-off
Valve and pipeline are connect with a pressure gauge.Detection hole is located on the reaming tube wall after shrinkage cavity, and pressure herein is stable, can be anti-
Reflect the reality output pressure of Venturi tube output terminal.
Preferably, Venturi tube and the output terminal of the pressure reducing valve main valve pass through flanged joint.
The beneficial effects of the invention are as follows：
The present invention can voluntarily adjust output pressure according to by the flow of pressure reducing valve, and average output pressure is greatly reduced, keeps away
Exempt from no matter pipeline is using peak, paddy period to bear high pressure always, reduce the probability of pipe-line system leak and booster, energy saving,
Resource reduces maintenance cost, maintains pipe-line system normal service life.
Description of the drawings
Fig. 1 is a kind of structure diagram of common pressure reducing valve；
Fig. 2 is a kind of structure diagram of the present invention；
Fig. 3 calculates figure for Venturi tube output pressure.
In figure, 1- pressure reducing valve main valves, 3- flaps, 4- valve rods, 8- inlet pressure gauges, 9- external control pipelines, 10- Throttle needle valves,
11- depressurizes pilot valve, 12- delivery gauges, 13- Venturi tubes, 14- control chambers, 15- shut-off valves, b- pipelines, c- connecting tubes
Road, d1Low pressure delivery outlet, d2Detection hole, d3Shrinkage cavity, V- valve port of main valve.
Specific embodiment
The invention will be further described for specific embodiment below in conjunction with the accompanying drawings.
Embodiment：
As shown in Fig. 2, a kind of Depressure valve, including by pressure reducing valve main valve 1, decompression pilot valve 11, shut-off valve 15 and phase
The general pressure reducing valve for answering the compositions such as pipeline, pressure gauge and the Venturi tube 13 connected with pressure reducing valve main valve 1 and several connecting tubes
Road.General pressure reducing valve is the common pressure reducing valve of 200X types, and pressure reducing valve main valve 1 is equipped with control chamber 14.13 both ends of Venturi tube are equipped with
Flange, the flange at both ends respectively with pressure reducing valve main valve 1 and the respective flange bolt of downstream line (being not drawn into figure), washer and
The connections such as nut.Counter bore diameter between 13 endoporus of Venturi tube, two end is equal to the disengaging pore size of pressure reducing valve main valve 1, in endoporus
Section updrift side partially is equipped with the shrinkage cavity d of a length L3, shrinkage cavity d3Connection cone angle with upstream and downstream reaming is respectively 60 ° and 30 °, is contracted
Hole d3The midpoint tube wall of length L is equipped with the low pressure delivery outlet d of a radial direction1, low pressure delivery outlet d1Pass through pipeline b etc. and decompression
The pressure feedback input hole connection of pilot valve 11.The reaming tube wall in the endoporus of Venturi tube 13 downstream direction is equipped with radial direction
Detection hole d2, detection hole d2It is connect by connecting pipe c, shut-off valve 15 with pressure gauge 12, to measure output pressure P2。
The operation principle of the utility model pressure reducing valve is, when being changed by the flow Q of pressure reducing valve, according to formula v=4Q/
πd2It is found that flow through Venturi tube shrinkage cavity d3Flow velocity can occur the variation of bigger, flow velocity and aperture square are inversely proportional, therefore low
Press delivery outlet d1The variation of bigger also occurs for the pressure at place, this pressure is fed back to by pipeline b in decompression pilot valve 11, and control is defeated
Go out pressure P2.When flow increases, pass through shrinkage cavity d3Flow velocity increase, low pressure delivery outlet d1Pilot valve is depressurized in the pressure reduction at place
11 valve port delays out, the pressure in release control chamber 14, and 3 top pressure of flap in pressure reducing valve main valve 1 reduces, in valve rod 4
Lower rising is oriented to, pressure reducing valve valve port of main valve V is caused to delay out, output pressure P2It increases, as long as flow remains unchanged, output pressure
Power is maintained on this raised stress level；Conversely, when the flow if reduced, pass through shrinkage cavity d3Flow velocity reduce, low pressure is defeated
Portal d1The valve port Slow Close of pilot valve 11 is depressurized in the pressure rise at place, and the pressure in control chamber 14 rises, and causes pressure reducing valve main valve
Valve port V Slow Closes, output pressure P2It decreases, is achieved in output pressure and changes with changes in flow rate.Shrinkage cavity d3Size influence
Output pressure P when changing to flow2Change rate, shrinkage cavity d3Aperture is smaller, output pressure P2With the change rate of changes in flow rate
It is bigger, specifically take it is much be advisable, depending on the requirement that changes to corresponding output pressure of water supply variation, this requirement can be before
Phase, a large amount of statistical data primarily determined, was then modified when on probation.Should be minimum by total water consumption first before on probation, and
The requirement of least favorable water distribution point water consumption maximum depressurizes pilot valve 11 by adjusting, determines minimum output pressure P2min.Shrinkage cavity d3
Size must satisfy total water consumption maximum, and maximum hydraulic pressure P required during least favorable water distribution point water consumption maximum2max.At a high speed
Fluid passes through shrinkage cavity d3When, certain pressure drop can be generated, but this pressure drop does not interfere with output pressure P2, because of the work of pressure reducing valve
It is exactly to realize decompression using throttling to make principle, and decompression is only distributed in pressure reducing valve valve port of main valve V and shrinkage cavity d by the present invention3Two
Place.
In addition, by " venturi design specification " design Venturi tube, fluid by when drag losses, i.e. pressure drop,
It often ignores in water force, therefore the pressure that can be considered as pressure reducing valve Main valve outlet end is equal to output pressure P2。
We use tricks to count according to confirming possibility that this patent is realized, that is, Venturi tube shrinkage cavity d below3Middle part
Low pressure delivery outlet d1Can the low pressure that place generates act decompression pilot valve 11.
Referring to Fig. 3, when calculating think the center line in I-I sections and II-II section be it is horizontal, i.e., it is both contour；And
Pressure loss when ignoring fluid by Venturi tube.
List the Bernoulli equation in I-I sections and II-II section
I.e.
P in formula1Pressure at-I-I sections, Pa；
p2Pressure at-II-II section, Pa；
u1The flow velocity of fluid, m/s at-I-I sections；
u2The flow velocity of fluid, m/s at-II-II section；
The density of ρ-fluid, kg/m3, ρ water=1000kg/m3。
Now illustrated with the pressure reducing valve of water flowing：
①p1For aforementioned minimum setting pressure P2min, take p1=0.2MPa=2 × 105Pa(20mH2O)；
2. set d=0.6D, then,
Above-mentioned each value is substituted into (1) to obtain：
Act on the additonal pressure on decompression guide's valve film
Δ p=p1-p2(Pa)……(3)
Depressurize the active force on guide's valve film
F=Δs pS (N) ... (4)
In formula S be depressurize guide's valve film area, m2。
If depressurize pilot valve diaphragm diameter d0=φ 50mm
U at different flow rates below1(i.e. different flow Q) substitutes into formula (2)~formula (5), and the p that will be calculated2, Δ p and
F is listed as follows：
Analytical formula (2) and upper table can be seen that
1. the directed force F on guide's valve film is depressurized with flow velocity u1Growth parabolically increase.
2. flow velocity u1In below 1m/s, since directed force F is insufficient to allow decompression guide's valve events, pressure reducing valve output pressure
P2Do not change with changes in flow rate, this operating mode must be when being happened at water low ebb, and flow is small at this time, and pressure is also low.Work as stream
Fast u1During ＞ 1.5m/s, directed force F is enough to make decompression guide's valve events, pressure reducing valve output pressure P2Change with flow.Flow is got over
Greatly, directed force F is bigger, and the aperture for depressurizing pilot valve valve port is bigger, and the aperture for leading to pressure reducing valve valve port of main valve V is bigger, output pressure
Power P2Increase bigger.
3. increase decompression pilot valve diaphragm diameter d0Or reduce Venturi tube shrinkage cavity d3Diameter, subtract with regard to the utility model can be improved
The sensitivity of pressure valve output pressure, can be compared under low flow velocity, can adjusting output pressure, and can increase P2- Q is parabolical
Slope.
Claims (4)
1. a kind of Depressure valve, including pressure reducing valve main valve（1）, pressure reducing valve main valve（1）It is equipped with control chamber（14）With decompression first
Pilot valve（11）, it is characterized in that further including Venturi tube（13）, Venturi tube（13）It is connected to pressure reducing valve main valve（1）Output terminal,
Venturi tube（13）Shrinkage cavity is equipped between the reaming at two ends（d3）, shrinkage cavity（d3）Tube wall be equipped with radial direction low pressure delivery outlet
（d1）, low pressure delivery outlet（d1）With depressurizing pilot valve（11）Pressure feedback input hole connection.
2. Depressure valve according to claim 1, it is characterized in that Venturi tube（13）Reaming and shrinkage cavity（d3）Be connected
Portion is all provided with tapered.
3. Depressure valve according to claim 1, it is characterized in that Venturi tube（13）Output terminal reaming tube wall on
Detection hole equipped with radial direction（d2）, detection hole（d2）Pass through shut-off valve and connecting pipe and a pressure gauge（12）Connection.
4. according to the Depressure valve described in claims 1 or 2 or 3, it is characterized in that Venturi tube（13）With pressure reducing valve main valve（1）
Output terminal pass through flanged joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711450179.0A CN108223867A (en) | 2017-12-27 | 2017-12-27 | A kind of Depressure valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711450179.0A CN108223867A (en) | 2017-12-27 | 2017-12-27 | A kind of Depressure valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108223867A true CN108223867A (en) | 2018-06-29 |
Family
ID=62649254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711450179.0A Pending CN108223867A (en) | 2017-12-27 | 2017-12-27 | A kind of Depressure valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN108223867A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110043703A (en) * | 2019-04-29 | 2019-07-23 | 中国水利水电科学研究院 | A kind of design method of piston type guide surge reliever |
| CN110094573A (en) * | 2019-04-29 | 2019-08-06 | 中国水利水电科学研究院 | A kind of design method of diaphragm type guide surge reliever |
| CN110159813A (en) * | 2019-05-23 | 2019-08-23 | 广东维宁科技有限公司 | A kind of transverse direction water route pressure reversing arrangement and hot water cyclesystem |
| US11521758B2 (en) | 2018-12-13 | 2022-12-06 | Rolls-Royce Smr Limited | Depressurization valve |
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| CN107143543A (en) * | 2017-04-27 | 2017-09-08 | 武汉船用机械有限责任公司 | A kind of hydraulic control valve group and control valve |
| CN107246498A (en) * | 2017-07-26 | 2017-10-13 | 中国长江电力股份有限公司 | A kind of water system pressure-reducing valve double guide's valve control systems and control method |
| CN207740511U (en) * | 2017-12-27 | 2018-08-17 | 杭州春江阀门有限公司 | A kind of Depressure valve |
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| GB0320619D0 (en) * | 2003-09-03 | 2003-10-01 | Fluid Controls U K Ltd | Pressure reducing valve system |
| KR101042289B1 (en) * | 2011-01-13 | 2011-06-17 | 조진식 | Valve system for controlling pressure of supplied water |
| WO2013042853A1 (en) * | 2011-09-19 | 2013-03-28 | 주식회사 바램 | Flow-linked proportionally-controlled reduction valve system |
| CN102434781A (en) * | 2011-12-02 | 2012-05-02 | 杭州华惠阀门有限公司 | Temperature-reducing and pressure-reducing system |
| CN103411004A (en) * | 2013-06-09 | 2013-11-27 | 杭州春江阀门有限公司 | Venturi tube type low-resistance backflow preventing device |
| CN204371648U (en) * | 2014-12-31 | 2015-06-03 | 武汉大学 | A kind of multi-functional water hammer stops valve in advance |
| CN106249769A (en) * | 2015-06-03 | 2016-12-21 | 艾默生过程管理调节技术公司 | The control system of adjustable deadband |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11521758B2 (en) | 2018-12-13 | 2022-12-06 | Rolls-Royce Smr Limited | Depressurization valve |
| US11742100B2 (en) | 2018-12-13 | 2023-08-29 | Rolls-Royce Smr Limited | Depressurisation valve |
| CN110043703A (en) * | 2019-04-29 | 2019-07-23 | 中国水利水电科学研究院 | A kind of design method of piston type guide surge reliever |
| CN110094573A (en) * | 2019-04-29 | 2019-08-06 | 中国水利水电科学研究院 | A kind of design method of diaphragm type guide surge reliever |
| CN110043703B (en) * | 2019-04-29 | 2020-02-14 | 中国水利水电科学研究院 | Design method of piston type pilot water hammer relief valve |
| CN110094573B (en) * | 2019-04-29 | 2020-04-17 | 中国水利水电科学研究院 | Design method of diaphragm type pilot surge relief valve |
| CN110159813A (en) * | 2019-05-23 | 2019-08-23 | 广东维宁科技有限公司 | A kind of transverse direction water route pressure reversing arrangement and hot water cyclesystem |
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