CN207740511U - A kind of Depressure valve - Google Patents
A kind of Depressure valve Download PDFInfo
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- CN207740511U CN207740511U CN201721868533.7U CN201721868533U CN207740511U CN 207740511 U CN207740511 U CN 207740511U CN 201721868533 U CN201721868533 U CN 201721868533U CN 207740511 U CN207740511 U CN 207740511U
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- pressure
- valve
- pressure reducing
- reducing valve
- venturi tube
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Abstract
The utility model 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 end 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 a radial low pressure delivery outlet, and low pressure delivery outlet is connected to the feed back input hole of decompression pilot valve.The utility model 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 bearing high pressure always using peak, paddy period, reduces leak and the booster probability of pipe-line system, energy saving, resource reduces maintenance cost.
Description
Technical field
The utility model is related to a kind of control devices of pressure reducing valve output pressure, more specifically, it relates to a kind of novel
Pressure reducing valve.
Background technology
When supplying water to building after the high pressure water in outdoor water supply pipe net is using pressure reducing valve decompression, the hydraulic pressure after decompression must
It must ensure in water use peak, the use water, this hydraulic pressure of farthest, highest or other least favorable water distribution points include：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 when 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 water inlet warp knuckle of the medium from 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
When 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 P2When less than the setting value for depressurizing pilot valve 11, the valve of pilot valve 11 is depressurized
Mouth is slow to be opened, the pressure in release control chamber 14, and pressure reducing valve valve port of main valve V is slow to be opened, 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 are data introduction, water leakage to typically constitute from 20% of total water consumption or more, it is high or using with the passing of time for material, installation quality
Pipeline, water leakage are even up to 40% of total water consumption or more, this not only waste of energy, resource, but also increase maintenance cost.Therefore
The hydrostatic pressure of the national regulations of " Code for design of building water supply and sewerage ", minimum water distribution point is 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, 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 reality
It is provided a kind of output pressure making pressure reducing valve with novel and is changed with flow, significantly reduced average output pressure, reduce pipe
The Depressure valve of the probability of road system leak and booster.
The technical solution of the utility model is：A kind of Depressure valve, including pressure reducing valve main valve, pressure reducing valve main valve are equipped with
Control chamber and decompression pilot valve, further include Venturi tube, Venturi tube is connected to the output end of pressure reducing valve main valve, Venturi tube two
Shrinkage cavity is equipped between defeated reaming, the tube wall of shrinkage cavity is equipped with radial low pressure delivery outlet, low pressure delivery outlet and decompression pilot valve
Pressure feedback input hole connection.The utility model pressure reducing valve is designed to solve the deficiency of common pressure reducing valve, is commonly being subtracted
The outlet end of pressure valve has been connected a Venturi tube, and when flow changes, bigger can occur for flow velocity and pressure at shrinkage cavity
Variation, using the variation of this pressure go control pilot valve, to achieve the purpose that control pressure reducing valve output pressure.That is,
The utility model controls the feedback signal not instead of output pressure of pressure reducing valve output pressure itself, and the flow of pressure reducing valve works as stream
When measuring big, output pressure is just high；Flow hour, with regard to low, output pressure changes output pressure with flow.In this way, average output
Pressure is greatly reduced, and reduces the probability of pipe-line system leak and booster, has not only saved the energy, resource, but also reduce maintenance expense
With.
Preferably, the reaming be all provided with the portion of being connected of shrinkage cavity it is tapered.Taper is arranged with the portion of being connected of shrinkage cavity in reaming
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 end reaming of Venturi tube is equipped with radial detection hole, 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 end.
Preferably, Venturi tube and the output end of the pressure reducing valve main valve pass through flanged joint.
The utility model has the beneficial effects that：
The utility model can voluntarily adjust output pressure according to by the flow of pressure reducing valve, and average output pressure is greatly reduced
Power, avoids no matter pipeline is bearing high pressure always using peak, paddy period, reduces the probability of pipe-line system leak and booster, saves
The energy, resource reduce maintenance cost, maintain pipe-line system normal service life.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of common pressure reducing valve；
Fig. 2 is a kind of structural schematic diagram of the utility model；
Fig. 3 is that Venturi tube output pressure calculates figure.
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 implementation mode
The utility model is described in further detail 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
Answer the general pressure reducing valve of the compositions such as pipeline, pressure gauge, and with 1 concatenated Venturi tube 13 of pressure reducing valve main valve 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 °, contracting
Hole d3The midpoint tube wall of length L is equipped with a radial low pressure delivery outlet d1, low pressure delivery outlet d1Pass through pipeline b etc. and decompression
The pressure feedback input hole of pilot valve 11 is connected to.The reaming tube wall in the endoporus of Venturi tube 13 downstream direction is equipped with radial
Detection hole d2, detection hole d2It is connect with pressure gauge 12 by connecting pipe c, shut-off valve 15, 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 flowing 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 is slow to be opened, 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
It is oriented to lower rising, causes pressure reducing valve valve port of main valve V is slow to open, 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, passing 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.It is minimum that total water consumption should be pressed first before on probation, and
The maximum requirement of least favorable water distribution point water consumption 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 when least favorable water distribution point water consumption maximum2max.At a high speed
Fluid passes through shrinkage cavity d3When, certain pressure drop is will produce, 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, and decompression is only distributed in pressure reducing valve valve port of main valve V and shrinkage cavity by the utility model to make principle
d3At two.
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 be such that decompression pilot valve 11 acts.
Referring to Fig. 3, when calculating think the center line in the sections I-I and II-II section be it is horizontal, i.e., it is both contour；And
Ignore the pressure loss of the fluid by Venturi tube when.
List the Bernoulli equation in the sections I-I and II-II section
I.e.
P in formula1Pressure at the sections-I-I, Pa；
p2Pressure at-II-II section, Pa；
u1The flow velocity of fluid, m/s at the sections-I-I；
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 minimum setting pressure P above-mentioned2min, take p1=0.2MPa=2 × 105Pa(20mH2O)；
2. d=0.6D is set, 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)
S is the area for depressurizing guide's valve film, m in formula2。
If depressurizing 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 by calculated p2, Δ p and
F is listed as follows：
Analytical formula (2) and upper table can be seen that
1. depressurizing the directed force F on guide's valve film with flow velocity u1Growth parabolically increase.
2. flow velocity u1In 1m/s or less, 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 u1When ＞ 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, causes the aperture of pressure reducing valve valve port of main valve V bigger, output pressure
Power P2Increase bigger.
3. increasing decompression pilot valve diaphragm diameter d0Or reduce Venturi tube shrinkage cavity d3Diameter, the utility model can be improved and subtracted
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）First with decompression
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 end,
Venturi tube（13）Shrinkage cavity is equipped between the reaming at two ends（d3）, shrinkage cavity（d3）Tube wall be equipped with radial low pressure delivery outlet
（d1）, low pressure delivery outlet（d1）With decompression 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 end reaming tube wall on
Equipped with radial detection hole（d2）, detection hole（d2）Pass through shut-off valve and connecting pipe and a pressure gauge（12）Connection.
4. Depressure valve according to claim 1 or 2 or 3, it is characterized in that Venturi tube（13）With pressure reducing valve main valve（1）
Output end pass through flanged joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721868533.7U CN207740511U (en) | 2017-12-27 | 2017-12-27 | A kind of Depressure valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721868533.7U CN207740511U (en) | 2017-12-27 | 2017-12-27 | A kind of Depressure valve |
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| Publication Number | Publication Date |
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| CN207740511U true CN207740511U (en) | 2018-08-17 |
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ID=63120068
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721868533.7U Active CN207740511U (en) | 2017-12-27 | 2017-12-27 | A kind of Depressure valve |
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| Country | Link |
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| CN (1) | CN207740511U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108223867A (en) * | 2017-12-27 | 2018-06-29 | 杭州春江阀门有限公司 | A kind of Depressure valve |
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2017
- 2017-12-27 CN CN201721868533.7U patent/CN207740511U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108223867A (en) * | 2017-12-27 | 2018-06-29 | 杭州春江阀门有限公司 | A kind of Depressure valve |
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