CN108252361A - A kind of full-automatic dry pump constant pressure non-tower water supply system - Google Patents
A kind of full-automatic dry pump constant pressure non-tower water supply system Download PDFInfo
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- CN108252361A CN108252361A CN201810279974.6A CN201810279974A CN108252361A CN 108252361 A CN108252361 A CN 108252361A CN 201810279974 A CN201810279974 A CN 201810279974A CN 108252361 A CN108252361 A CN 108252361A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 198
- 239000000523 sample Substances 0.000 claims abstract description 36
- 239000008399 tap water Substances 0.000 claims abstract description 21
- 235000020679 tap water Nutrition 0.000 claims abstract description 21
- 238000005086 pumping Methods 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 230000006641 stabilisation Effects 0.000 claims description 5
- 238000011105 stabilization Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 230000005764 inhibitory process Effects 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B11/00—Arrangements or adaptations of tanks for water supply
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/078—Combined units with different devices; Arrangement of different devices with respect to each other
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/09—Component parts or accessories
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Structural Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The present invention discloses a kind of full-automatic dry pump constant pressure non-tower water supply system, belongs to non-tower water supply technical field.Current a variety of non-tower water supply systems build water tower due to being not required to, invest small, occupation of land less, it has been commonly utilized in the fields such as urban skyscraper, but since the tolerance in constant-pressure tank is limited, make hydraulic pressure fluctuation larger, to overcome the shortcoming, pump motor is equipped with more complicated frequency conversion intelligent control system, increase cost, same flow device should not be compatible with pressure tap water and the power match without pressure deep-well.A kind of full-automatic dry pump constant pressure non-tower water supply system of the present invention, the sealed constant-current tank of two alternations, upper space connects two-way workmanship air pump pump drainage gas port respectively, through electric-air valve and dynamoelectric water valve, and according to respective water-level probe signal up and down, Intelligent control air pump and the gas water (flow) direction for alternately converting two steady-flow tanks, the superposition force feed water or negative pressure pumping water pressurization for realizing the tap water of continuous-stable send the dry pump that water is compatible with to press water supply function without tower height.
Description
Technical field
The present invention relates to non-tower water supply field, more particularly to a kind of full-automatic dry pump constant pressure non-tower water supply system.
Background technology
Current a variety of non-tower water supply systems build water tower due to being not required to, and investment is small, it is few to take up an area, and has been commonly utilized in city
The fields such as skyscraper, but since the tolerance in constant-pressure tank is limited, make hydraulic pressure fluctuation larger, to overcome the shortcoming, water pump
Motor is equipped with more complicated frequency conversion intelligent control system, increases cost, and same flow device should not be compatible with pressure originally
Water and the power match without pressure deep-well.
Invention content
Present invention mainly solves the technical issues of, be to provide a kind of full-automatic dry pump constant pressure non-tower water supply system, can be low
The energy-efficient minor swing constant pressure of realization of cost, compatible tap water have pressure overlapped supercharging with without pressure draw water function of increasing pressure without on tower
Water system.
In order to solve the above technical problems, the technical solution adopted by the present invention is：The sealed constant-current tank of two alternations, on
Portion space connects two-way workmanship air pump pump drainage gas port respectively, through 3-position-3-way electric-air valve and 3-position-3-way dynamoelectric water valve, according to
Respectively the probe signals such as water level, Intelligent control air pump and the gas water (flow) direction for alternately converting two steady-flow tanks, realization are continuous steady up and down
Superposition force feed water or the negative pressure pumping water pressurization of fixed tap water send the dry pump that water is compatible with to press water supply function without tower height.
A kind of full-automatic dry pump constant pressure non-tower water supply system, two pressure bearing and seal metal steady-flow tanks, by left steady
Tank is flowed, water-level probe under left steady-flow tank, left outlet pipe, water-level probe on left steady-flow tank, left steady-flow tank air inlet/outlet, air pressure safety
Valve and right steady-flow tank, water-level probe and right steady-flow tank air inlet/outlet on right steady-flow tank, air pressure relief valve, right steady-flow tank outlet pipe,
Water-level probe under right steady-flow tank is formed using gas as power, two steady-flow tanks of the alternate left and right of disengaging air water function.
A kind of full-automatic dry pump constant pressure non-tower water supply system, the dual-purpose heat pump of pump drainage respectively connect air inlet/outlet
To electronic 3-position-3-way intake valve, electronic 3-position-3-way air outlet valve makes the gas that two steady-flow tanks of left and right realize recyclable control left
Go out into the right side, left and right is connected, the right three kinds of states gone out into a left side.
A kind of full-automatic dry pump constant pressure non-tower water supply system, two steady-flow tanks of left and right, internal water exist from opening
The left steady-flow tank outlet pipe of bottom, right steady-flow tank outlet pipe goes out water one-way valve by left steady-flow tank respectively, right steady-flow tank is discharged list
To valve, under the action of electronic 3-position-3-way water valve, two steady-flow tanks of left and right is made to realize the output water of recyclable control, a left side can be presented
Stop it is right go out, left and right with go out, it is right stop it is left go out three kinds of states, in the lower part of two steady-flow tanks of left and right, intake by left steady-flow tank unidirectional
Valve, right steady-flow tank water feeding one-way valve, water inlet keep unidirectional water inflow.
A kind of full-automatic dry pump constant pressure non-tower water supply system, respectively in the high water level of left and right two steady-flow tanks setting
And low water level, water-level probe under left steady-flow tank is installed, water-level probe under water-level probe and right steady-flow tank, right steady on left steady-flow tank
Water-level probe on tank is flowed, with sensed water level information, the conversion of two steady-flow tank Inlet and outlet water functions of control left and right；It is exported through total outlet pipe
High pressure water enter the settling tank of configuration, which installs controllable water pressure gauge, by hydraulic signal feedback control air pump
Start-stop, control output hydraulic pressure, manual exhaust valve is excludes air in case, water tank lower part installation manual blowdown valve.
A kind of full-automatic dry pump constant pressure non-tower water supply system, the anti-negative pressure that two steady-flow tank tops of left and right peace turns are opened
It closes, switchs and connected anti-negative one-way valve by lower half, top half is an anti-negative pressure Manual gas valve composition manually, is opened manually anti-
Negative pressure Manual gas valve, the vacuum inhibition for adapting to have pressure tap water prevent negative pressure, there is superposition boosting work(in tap water positive pressure
Can, anti-negative pressure Manual gas valve is turned off manually, which has dry pump negative pressure pumping water and boosting water supply function.
The beneficial effects of the invention are as follows：
1st, dry pump without tower high service, overcome the water pump of former tower-free water supplying, frequent starting and water hammer show in deep-well
As the injury maintenance difficult problem to water pump.
2nd, the tap water of ease of Use compatibility is superimposed anti-negative pressure structure and deep-well from pumping structure.
3rd, it is energy-efficient.
Description of the drawings
Fig. 1 is a kind of full-automatic dry pump constant pressure non-tower water supply system structure diagram.
Fig. 2 is a kind of full-automatic dry pump constant pressure non-tower water supply system, simulates the fundamental diagram of 3 clock working conditions.
Fig. 3 is a kind of full-automatic dry pump constant pressure non-tower water supply system, is the anti-negative pressure switch structural principle signal of amplification
Figure.
The label of each component is as follows in attached drawing：1st, left steady-flow tank；2nd, water-level probe under left steady-flow tank；3rd, left steady-flow tank water outlet
Pipe；4th, right steady-flow tank；5th, left steady-flow tank Dynamic Water bit line；6th, water-level probe on left steady-flow tank；7th, left steady-flow tank air inlet/outlet；8、
Air pressure relief valve；9th, left steady-flow tank goes out water one-way valve；10th, bi-bit bi-pass intake valve；11st, air inlet pipe；12nd, electronic 3-position-3-way into
Air valve；13rd, air pump；14th, total outlet pipe；15th, electronic 3-position-3-way water valve；16th, electronic 3-position-3-way air outlet valve；17th, controllable water
Press table；18th, blowdown drum exhaust outlet；19th, right steady-flow tank goes out water one-way valve；20th, settling tank；21st, manual blowdown valve；22nd, Horizon
Line；23rd, anti-negative pressure switch；24th, water-level probe on right steady-flow tank；25th, right steady-flow tank air inlet/outlet；26th, bi-bit bi-pass air bleeding valve；
27th, right steady-flow tank outlet pipe；28th, water-level probe under right steady-flow tank；29th, right steady-flow tank Dynamic Water bit line；30th, water inlet；31st, it is left
Steady-flow tank water feeding one-way valve；32nd, right steady-flow tank water feeding one-way valve；33rd, water outlet dynamic moves towards signal；34th, gas-dynamic trend is shown
Meaning；35th, anti-negative pressure Manual gas valve；36th, anti-negative one-way valve.
Specific embodiment
The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, and a kind of full-automatic dry pump constant pressure is without tower
Water system, the sealed constant-current tank of two alternations, upper space connects two-way workmanship air pump pump drainage gas port respectively, through three
Electric three-way air valve and 3-position-3-way dynamoelectric water valve, according to respective water-level probe signal up and down, Intelligent control air pump and alternating turn
The gas water (flow) direction of two steady-flow tank tanks is changed, the superposition force feed water or negative pressure pumping water pressurization for realizing the tap water of continuous-stable send water simultaneous
The dry pump of appearance presses water supply function without tower height.
A kind of full-automatic dry pump constant pressure non-tower water supply system, two pressure bearing and seal metal steady-flow tanks, by left steady
Tank 1 is flowed, water-level probe 2 under left steady-flow tank, left outlet pipe 3, water-level probe 6 on left steady-flow tank, left steady-flow tank air inlet/outlet 7, gas
Press safety valve 8 and right steady-flow tank 4, water-level probe 24 and right steady-flow tank air inlet/outlet 25 on right steady-flow tank, air pressure relief valve 26,
Right steady-flow tank outlet pipe 27, water-level probe 28 under right steady-flow tank, forms using gas as power, and disengaging air water function is alternately left
Right two steady-flow tanks 1,4.
A kind of full-automatic dry pump constant pressure non-tower water supply system, the dual-purpose heat pump 13 of pump drainage, respectively by air inlet/outlet
Electronic 3-position-3-way intake valve 12 is connected to, electronic 3-position-3-way air outlet valve 16 makes two steady-flow tanks 1,4 of left and right realize recyclable control
A gas left side into it is right go out, left and right conducting, it is right into it is left go out three kinds of states.
A kind of full-automatic dry pump constant pressure non-tower water supply system, two steady-flow tanks 1,4 of left and right, internal water is from opening
Left steady-flow tank outlet pipe 3 in bottom, right steady-flow tank outlet pipe 27 go out water one-way valve 9, right steady-flow tank by left steady-flow tank respectively
Go out water one-way valve 19, under the action of electronic 3-position-3-way water valve 15, two steady-flow tanks 1,4 of left and right is made to realize the defeated of recyclable control
Water outlet, can present it is left stop it is right go out, left and right with go out, it is right stop it is left go out three kinds of states, in left and right, the lower part of two steady-flow tanks 1,4 passes through a left side
Steady-flow tank water feeding one-way valve 31, right steady-flow tank water feeding one-way valve 32, water inlet 30 keep unidirectional water inflow.
A kind of full-automatic dry pump constant pressure non-tower water supply system, respectively in the height of left and right two steady-flow tanks 1,4 setting
Water level and low water level, install water-level probe 2 under left steady-flow tank, water-level probe under water-level probe 6 and right steady-flow tank on left steady-flow tank
Water-level probe 24 on 28 right steady-flow tanks, with sensed water level information, the conversion of control left and right two steady-flow tanks 1,4 Inlet and outlet water functions；Through
The high pressure water that total outlet pipe 14 exports enters the settling tank 20 of configuration, which installs controllable water pressure gauge 17 and believe hydraulic pressure
The start-stop of number feedback control air pump 13, control output hydraulic pressure, manual exhaust valve 26 is excludes air in case, water tank lower part installation hand
Dynamic blowdown valve 21.
A kind of full-automatic dry pump constant pressure non-tower water supply system, two steady-flow tanks 1 of left and right, 4 tops peace turn anti-negative
Compress switch 23, structure such as Fig. 3, lower half is connected anti-negative one-way valve 36, and top half is a manual anti-negative pressure Manual gas valve
35, open manually anti-negative pressure Manual gas valve 35 for adapt to have pressure tap water vacuum inhibit prevent negative pressure, in tap water positive pressure
When have superposition boost function, be turned off manually anti-negative pressure Manual gas valve 35, which has dry pump negative pressure pumping water and boosting water supply work(
Energy.
Fig. 2 is a kind of schematic diagram of 3 kinds of working conditions of full-automatic dry pump constant pressure non-tower water supply system.Below in conjunction with attached drawing
2 embodiments introduce its operation principle, when the left steady-flow tank Dynamic Water bit line 5 assumed as shown in Figure 2 a and right steady-flow tank dynamic water table
Water position status shown in line 29, left steady-flow tank 1 move towards signal 33 according to water outlet dynamic, and gas-dynamic moves towards direction work shown in signal 34
Make, left steady-flow tank 1 is operated in the state of drawing water at this time, and right steady-flow tank 4 is operated under high-pressure gas pressure and send water state.
When the water in two steady-flow tanks 1,4 of left and right is entered such as Fig. 2 b states, the output letter of water-level probe 6 on left steady-flow tank
Number, air pump 13 is closed, electronic 3-position-3-way intake valve 12, electronic 3-position-3-way air outlet valve 16, on electronic 3-position-3-way water valve 15
Motor rotates, and respectively enters the transverse direction of electronic 3-position-3-way intake valve 12 and electronic 3-position-3-way air outlet valve 16 as shown in Figure 2 b
Two conductings and three conductings of electronic 3-position-3-way water valve 15, the air pressure that two steady-flow tanks 1,4 of left and right are in the short time at this time are put down
Weighing apparatus, double tanks are water state.
Electronic 3-position-3-way intake valve 12, electronic 3-position-3-way air outlet valve 16, on electronic 3-position-3-way water valve 15 motor after
Continuous rotation, two steady-flow tanks 1,4 of left and right enter such as Fig. 2 c states, and left steady-flow tank 1 is operated under high-pressure gas pressure and send water at this time
State, right steady-flow tank 4 are operated in the state of drawing water, until entering water level as shown in Figure 2 c, when right 4 water level of steady-flow tank contacts right current stabilization
On tank during water-level probe 24, system is again introduced into process shown in Fig. 2 b, returns to Fig. 2 a working conditions.
Two steady-flow tanks 1,4 of left and right are equipped with air pressure relief valve 8, to prevent the pressure limit of special circumstances, when settling tank 20
Hydraulic pressure reach requirement after, controllable water pressure gauge 17 controls air pump 13 to close, at this time according to the usage amount of water supply, when less than controllable water
Table 17 is pressed to open air pump 13 when setting hydraulic pressure, which combines the elastic air pressure of about current stabilization tank volume, it is ensured that high quality
Constant pressure water supply.
Water inlet 30 in system, left steady-flow tank water feeding one-way valve 31, right steady-flow tank water feeding one-way valve 32 and left steady-flow tank go out
Water one-way valve 9, right steady-flow tank go out water one-way valve 19 and are cooperation above procedure and set.Water inlet 30 can be inserted directly into deep-well,
Also can access has pressure tap water, for two steady-flow tank 1 of the negative pressure suppression of tap water, the system or so, 4 tops is prevented to be equipped with anti-negative pressure
Switch 23, operation principle are when this switch negative pressure Manual gas valve 35 is turned off manually, and two steady-flow tanks 1,4 of left and right are worked alternatively one
Tank negative pressure pumping water and a tank positive pressure service position, when opening this negative pressure Manual gas valve 35, when tap water pressure is more than atmospheric pressure
When, tap water is automatically into a steady-flow tank, and air pump 13 is superimposed the pressure water supply that tap water pressure is used for another steady-flow tank, when originally
During hydraulic pressure subatmospheric, negative one-way valve 36 enters air, and the steady-flow tank is without pumping function, when tap water pressure only meets
When less than the water level of a tank, also system inversion can control to supply water when the lower water-level probe of another steady-flow tank exposes the surface, with not
Sufficient canful state continuously works alternatively, until tap water cut-off state, left and right two steady-flow tanks, 1,4 pair of lower water-level probe exposes the surface
When, system stalls.
A kind of full-automatic dry pump constant pressure non-tower water supply system, positional structure as shown in Figure 1 can will remove precipitation
20 horizon of the water tank embedment of equipment below 22 underground, to save floor space and preferably utilize weak tap water pressure.
Scheme described above is only the section Example of the present invention, is not intended to limit the scope of the invention, every
The equivalent structure or equivalent flow shift made using description of the invention and accompanying drawing content, is directly or indirectly used in other
Relevant technical field, is included within the scope of the present invention.
Claims (6)
1. a kind of full-automatic dry pump constant pressure non-tower water supply system, the sealed constant-current tank of two alternations, upper space difference
Two-way workmanship air pump pump drainage gas port is connected, through 3-position-3-way electric-air valve and 3-position-3-way dynamoelectric water valve, according to respective water up and down
Position probe signal, Intelligent control air pump and the gas water (flow) direction for alternately converting two steady-flow tank tanks realize the tap water of continuous-stable
Superposition force feed water or negative pressure pumping water pressurization send water be compatible with dry pump without tower height press water supply function.
2. a kind of full-automatic dry pump constant pressure non-tower water supply system according to claim 1, two pressure bearing and seal metals are steady
Tank is flowed, by left steady-flow tank（1）, water-level probe under left steady-flow tank（2）, left outlet pipe（3）, water-level probe on left steady-flow tank（6）, it is left
Steady-flow tank air inlet/outlet（7）, air pressure relief valve（8）And right steady-flow tank（4）, water-level probe on right steady-flow tank（24）And right current stabilization
Tank air inlet/outlet（25）, air pressure relief valve（26）, right steady-flow tank outlet pipe（27）, water-level probe under right steady-flow tank（28）, composition
Using gas as power, two steady-flow tanks of the alternate left and right of disengaging air water function（1）、（4）.
3. a kind of full-automatic dry pump constant pressure non-tower water supply system according to claim 1, the dual-purpose heat pump of pump drainage（13）, point
Air inlet/outlet electronic 3-position-3-way intake valve is not connected to（12）, electronic 3-position-3-way air outlet valve（16）, make two steady-flow tanks of left and right
（1）、（4）The recyclable gas left side controlled of realization goes out into the right side, left and right is connected, the right three kinds of states gone out into a left side.
4. a kind of full-automatic dry pump constant pressure non-tower water supply system according to claim 1, two steady-flow tanks of left and right（1）、
（4）, the left steady-flow tank outlet pipe of internal water from opening in bottom（3）, right steady-flow tank outlet pipe（27）, pass through left current stabilization respectively
Tank goes out water one-way valve（9）, right steady-flow tank go out water one-way valve（19）, in electronic 3-position-3-way water valve（15）Under the action of, make left and right
Two steady-flow tanks（1）、（4）Realize the output water of recyclable control, can present it is left stop it is right go out, left and right with go out, it is right stop it is left go out three kinds
State, in two steady-flow tanks of left and right（1）、（4）Lower part pass through left steady-flow tank water feeding one-way valve（31）, right steady-flow tank water feeding one-way valve
（32）, water inlet（30）, keep unidirectional water inflow.
5. a kind of full-automatic dry pump constant pressure non-tower water supply system according to claim 1, respectively in two steady-flow tanks of left and right
（1）、（4）The high water level and low water level of setting, install water-level probe under left steady-flow tank（2）, water-level probe on left steady-flow tank（6）,
And water-level probe under right steady-flow tank（28）Water-level probe on right steady-flow tank（24）, with sensed water level information, two current stabilizations of control left and right
Tank（1）、（4）The conversion of Inlet and outlet water function；The high pressure water exported through total outlet pipe 14 enters the settling tank of configuration（20）, the water
Upper box part installs controllable water pressure gauge（17）By hydraulic signal feedback control air pump（13）Start-stop, control output hydraulic pressure, manually arrange
Air valve（26）To exclude air in case, water tank lower part installation manual blowdown valve（21）.
6. a kind of full-automatic dry pump constant pressure non-tower water supply system according to claim 1, two steady-flow tanks of left and right（1）、（4）
The anti-negative pressure switch that top peace turns（23）, the anti-negative one-way valve of lower half series connection（36）, top half is a manual anti-negative pressure hand
It takes offence valve（35）, anti-negative pressure Manual gas valve is opened manually（35）Vacuum inhibition for adapting to have pressure tap water prevents negative pressure,
There is superposition boost function during tap water positive pressure, anti-negative pressure Manual gas valve is turned off manually（35）, which has dry pump negative pressure pumping water
And boosting water supply function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810279974.6A CN108252361A (en) | 2018-04-01 | 2018-04-01 | A kind of full-automatic dry pump constant pressure non-tower water supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810279974.6A CN108252361A (en) | 2018-04-01 | 2018-04-01 | A kind of full-automatic dry pump constant pressure non-tower water supply system |
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| Publication Number | Publication Date |
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| CN108252361A true CN108252361A (en) | 2018-07-06 |
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| CN201810279974.6A Pending CN108252361A (en) | 2018-04-01 | 2018-04-01 | A kind of full-automatic dry pump constant pressure non-tower water supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173023A (en) * | 2019-06-24 | 2019-08-27 | 上海威派格智慧水务股份有限公司 | A kind of three tank body stabilizing compensation non-negative pressure water-supply devices |
-
2018
- 2018-04-01 CN CN201810279974.6A patent/CN108252361A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173023A (en) * | 2019-06-24 | 2019-08-27 | 上海威派格智慧水务股份有限公司 | A kind of three tank body stabilizing compensation non-negative pressure water-supply devices |
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