CN2668709Y - Pressure-relieve water-complementing full-automatic constant-pressure water-feeding device for use in peak-hour of water use - Google Patents
Pressure-relieve water-complementing full-automatic constant-pressure water-feeding device for use in peak-hour of water use Download PDFInfo
- Publication number
- CN2668709Y CN2668709Y CNU2003201213962U CN200320121396U CN2668709Y CN 2668709 Y CN2668709 Y CN 2668709Y CN U2003201213962 U CNU2003201213962 U CN U2003201213962U CN 200320121396 U CN200320121396 U CN 200320121396U CN 2668709 Y CN2668709 Y CN 2668709Y
- Authority
- CN
- China
- Prior art keywords
- valve
- pressure
- water
- pipe network
- abandon
- Prior art date
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Control Of Fluid Pressure (AREA)
- Fluid-Driven Valves (AREA)
Abstract
The utility model provides a pressure-relieve water-complementing full-automatic constant-pressure water-supplying device for peak-hour water use, which is characterized in that: the utility model comprises a pressure setting valve connected between the main pipe network of main water and the users' pipe network in series, a pressure-relieve valve, a pressure-relieve water storage tank and a pressure-complementing line pump. Wherein, the top of the pressure-relieve water storage tank is connected with the output end of the main pipe network via the pressure setting valve, and the bottom is provided with an outfall connected with the users' pipe network via the pressure-complementing line pump. The top of the pressure-relieve water storage tank is also provided with the pressure-relieve valve. When the pressure of the main pipe network of main water is normal, the device is homologous to be used for direct press complement and water supply on the main pipe network. When the pressure of the main pipe network at peak hour of water use is lower than a certain value, the water intake of the main pipe network is closed via the pressure setting valve, and meanwhile, the pressure-relieve valve is open, and the storing water in the tank is used for keep water supply. When the pressure of the main network returns to normal, the pressure setting valve is automatically open, and the device gets back to the normal press-complementing operating mode. The device saves energy, guaranteeing stable and normal water supply and alleviating the attack on the main pipe network at peak hour of water use with perfect performance.
Description
Affiliated technical field
The utility model provides a kind of peak water to abandon and presses moisturizing fully-automatic constant pressure water supply installation, belong to the automatic ftercompction hydrotechny of city tap-water pipe network field.
Background technology
Existing urban water supply mode mainly contains two kinds:
A kind of is that the reservoir formula supplies water: during the tap water pipe network insufficient pressure of living area, then build a big reservoir, water retention capacity generally is living area 8--24 hour a water supply volume.The water of tap water pipe network is put into the pond earlier, draws water from the pond with pump and delivers to the user.Water pump supplies water by the frequency control automatic constant-pressure, and the pond middle water level is by fluviograph control, is lower than designated water level and is contained in and is responsible for online valve and opens automatically and discharge water, and is higher than water level and stops automatically.This kind mode is present most widely used method, and advantage is: do not cut off the water supply during water use peak; Shortcoming is: power consumption is big, and former ductwork pressure is released when going into the pond because of tap water; Floor space is big, and expense is higher; Have water pollution once again, slow because of water circulation in the pond, the resting period is long, and the pond is poorly sealed;
Another kind is directly to supply water in the ftercompction of tap water pipe network armored pump: add a tubing pump on the net at running water pipe, supply pressure and directly send into the user under the prerequisite that former ductwork pressure is not abandoned, water pump passes through varying speed and constant pressure feed water equally.Be responsible for the net negative pressure for not causing, add a controller at the pump intake end, when ductwork pressure hanged down to the controller setting value, controller cut out, and device stops to supply water to the user.Access controller has two kinds of forms: mechanical type and electric-controlled type, and two kinds of forms all have time-delay closing inlet valve function, and purpose is to eliminate the misoperation that the pressure oscillation of tap water pipe network causes.Advantage is: power saving, and floor space is little, the water quality non-secondary pollution; Weak point is: cause during water use peak and cut off the water.As cook to have a dinner and cause tap water pipe network flow to increase rapidly when concentrating water, the peak water is 5-7 times of ebb water supply volume sometimes, uses this device if supply water in many places, will impact to whole tap water pipe network, consequently causes certain customers to cut off the water.
The utility model content
The purpose of this utility model provides and a kind ofly can overcome above-mentioned defective, promptly energy-conservation, guarantee steady normal water supply again, give when alleviating water use peak and be responsible for the impact that net causes, also to reduce floor space simultaneously as far as possible, avoid the peak water of water pollution once again to abandon pressure moisturizing fully-automatic constant pressure water supply installation.Its technology contents is:
A kind of peak water is abandoned and is pressed moisturizing fully-automatic constant pressure water supply installation, it is characterized in that: comprise that being serially connected in tap water is responsible for net and sets valve with the pressure between user's pipe network, abandon and press valve, abandon pressure water tank and ftercompction tubing pump, wherein abandon the top of pressing water tank and set the output that valve connects person in charge's net through pressure, its bottom is provided with delivery port and connects user's pipe network through the ftercompction tubing pump, and the top of abandoning the pressure water tank also is provided with abandons the pressure valve.
Described peak water is abandoned and is pressed moisturizing fully-automatic constant pressure water supply installation, abandon the pressure valve and be arranged on a side of abandoning pressure water tank top manhole, manhole cover is provided with abandons the water inlet of pressing water tank, abandon and press valve to comprise valve seat, valve gap, link rod, cam and exhaust floating drum, wherein valve seat is fixedlyed connected with manhole, the link rod two ends are connected through the outer wall of active pin shaft with valve gap and valve seat respectively, cam is positioned at bottom one side of valve seat, and flexibly connect with the valve seat bearing pin, the exhaust floating drum is positioned to abandon presses water tank one end to be weldingly fixed on the cam.
Described peak water is abandoned and is pressed moisturizing fully-automatic constant pressure water supply installation, pressure is set valve and is comprised valve body, valve rod, fairlead, Valve mouth cover, the Valve mouth cover nut, piston, piston bush, pressure spring, screw press, spring housing, the ventilation mouth, the spring seat of honour, spring lower seat, the valve bottom, wherein body cavity is partitioned into intake antrum and water chamber correspondence and connects and be responsible for net and abandon the water inlet of pressing water tank, the valve port place shutoff that is communicated with in two chambeies is to be fixed on the Valve mouth cover on the valve rod, and the valve rod upper end is passed piston and is threaded with spring lower seat, fixedly installs a piston bush in the valve body, piston and piston bush damping sealing, dock with the valve body upper surface bottom of spring housing, and with the end face crimping of piston bush, the sidewall of spring housing is provided with the ventilation mouth, pressure spring is by the spring seat of honour, spring lower seat is vertically installed between spring housing and the piston, screw press passes spring housing and spring seat of honour roof pressure from screw top, and valve bottom fixed sealing gets lodged in bottom and the valve body formation spill cavity that valve body is positioned at intake antrum, at the interval intake antrum, the sidewall of spill cavity is provided with fairlead and pod apertures, fairlead is connected with sidewall thread, and the valve rod lower end is passed fairlead by intake antrum and entered in the spill cavity.
Described peak water is abandoned and is pressed moisturizing fully-automatic constant pressure water supply installation, is provided with level sensor in the inside of abandoning the pressure water tank, and its bottom is provided with soil cleaning port.
Described peak water is abandoned and is pressed moisturizing fully-automatic constant pressure water supply installation, abandons and presses water tank user's pipe network afterwards to be provided with 2 series connection ftercompction tubing pumps that have flap valve.
Its operating principle is: be responsible at tap water and set up pressure setting valve on the net, abandon the pressure valve, abandon pressure water tank and ftercompction tubing pump, be responsible for net pressure just often at tap water, said apparatus is equivalent to be responsible for the water supply of direct ftercompction on the net; When water use peak person in charge net pressure is lower than certain value, to be responsible for the net water inlet by pressure setting valve closes, prevent to cause negative pressure to being responsible for net, with abandon the pressure valve of abandoning of pressing water tank to be communicated with and open, rely on a jar interior retaining to continue to keep supplying water, device was finished automatically by ftercompction water supply and was transferred the function conversion that the reservoir formula supplies water to this moment.When be responsible for net pressure recover normal after, pressure is set valve and is opened automatically again, is responsible for network recovery and jar supplies water to abandoning to press, water level is abandoned and is pressed valve to close automatically during to certain value, device comes back to normal ftercompction running status.
The utility model compared with prior art can be energy-conservation, guaranteed steady normal water supply again, given when alleviating water use peak and be responsible for the impact that net causes, and floor space is little simultaneously, avoids water pollution once again.Be primarily aimed at the fast development of urban construction, water transfer pipe network is too much long, and water supply volume is excessive, causes the hydraulic pressure deficiency, and the usefulness of water supply ftercompction during the high-rise building water.
Description of drawings
Fig. 1 is the flow chart of the utility model in application;
Fig. 2 is the structural representation that middle pressure embodiment illustrated in fig. 1 is set valve;
Fig. 3 abandons in embodiment illustrated in fig. 1 to press valve to press the tank connected structural representation of retaining with abandoning.
The specific embodiment
1, pressure is set valve 2, abandon and press valve 3, abandon and press water tank 4, pressure meter 5, be responsible for net 6, soil cleaning port 7, delivery port 8, level sensor 9, ftercompction tubing pump 10, flap valve 11, pressure sensor 12, user's pipe network 13, valve body 14 valve rods 15, fairlead 16, Valve mouth cover 17, Valve mouth cover nut 18, piston 19, piston bush 20, pressure spring 21, screw press 22, spring housing 23, ventilation mouth 24, the spring seat of honour 25, spring lower seat 26, valve bottom 27, intake antrum 28, water chamber 29, spill cavity 30, pod apertures 31, manhole 32, water inlet 33, manhole cover 34, valve seat 35, valve gap 36, link rod 37, cam 38, exhaust floating drum 39, support
In Fig. 1: abandon the top of pressing water tank 3 and be provided with the water inlet 32 of abandoning pressure valve 2 and connecing pressure setting valve 1, the water inlet that pressure is set valve 1 connects the output of being responsible for net 5, abandon the delivery port 7 that the bottom of pressing water tank 3 is provided with soil cleaning port 6 and connects user's pipe network 12 inputs, abandon the inside of pressing water tank 3 and be provided with programmable logic controller PLC in level sensor 8 connected control systems, abandon and press water tank 3 user's pipe network 12 afterwards to be provided with 2 series connection ftercompction tubing pumps 9 that have flap valve 10, wherein have only a ftercompction tubing pump 9 to be subjected to little Frequency Converter Control, whether another ftercompction tubing pump 9 can move according to the pressure decision of user's pipe network 12, so just overcome and used high-power large pipeline pump of a big Frequency Converter Control in the past, in the defective that user's water supply volume turns round seldom the time all the time, saved the energy.Be responsible for also to be provided with as required on pressure meter 4, the user's pipe network 12 on the net 5 connecing pressure sensor 11, pressure sensor 11 is connected with programmable logic controller PLC in the control system.
In Fig. 2: valve body 13 inner chambers are partitioned into intake antrum 27 and water chamber 28 correspondences connect the water inlet 32 of being responsible for net 5 and abandoning pressure water tank 3, Valve mouth cover 16 connects with valve rod 14 by Valve mouth cover nut 17, shutoff is on the valve port of two chambeies connection, valve rod 14 upper ends are passed piston 18 and are threaded with spring lower seat 25, fixedly install a piston bush 19 in the valve body 13, piston 18 and piston bush 19 dampings sealing, dock with valve body 13 upper surfaces the bottom of spring housing 22, and with the end face crimping of piston bush 19, the sidewall of spring housing 22 is provided with ventilation mouth 23, pressure spring 20 is by the spring seat of honour 24, spring lower seat 25 is vertically installed between spring housing 22 and the piston 18, screw press 21 passes spring housing 22 and the spring seat of honour 24 roof pressures from screw top, valve bottom 26 fixed sealing get lodged in bottom and the valve body 13 formation spill cavities 29 that valve body 13 is positioned at intake antrum 27, at interval intake antrum 27, the sidewall of spill cavity 29 is provided with fairlead 15 and pod apertures 30, fairlead 15 is connected with sidewall thread, and valve rod 14 lower ends are passed fairlead 15 by intake antrum 27 and entered in the spill cavity 29.
Its operating principle is: after person in charge's net 5 water flow to intake antrum 27, when hydraulic pressure surpassed setting value, water promotion Valve mouth cover 16 and valve rod 14 were up, and valve port is opened, and water passes in and out water cavity 28 to abandoning pressure water tank 3 through valve port.The process that valve port is opened is that slow opening { is closed } process, the effect that slow opening { closed } also is for buffering water pressure fluctuations when being responsible for net 5 low pressure zone, upper piston 18 end areas of water chamber 28 equal the end area of Valve mouth cover 16, effect is the active forces of equalization of discharge chamber 28 interior hydraulic pressure to Valve mouth cover 16, no matter be pressure size in the water chamber 28, act on the active force of two opposite sign but equal magnitude on piston 18 and the Valve mouth cover 16, be balanced by valve rod 14, make valve port open size and only be subjected to intake antrum 27 promptly to be responsible for the control of net 5 hydraulic pressure.When hydraulic pressure less than when setting value, Valve mouth cover 16 and valve rod 13 get lodged on the valve port under the effect of pressure spring 20, will be responsible for net 5 water inlets and close, and prevent to cause negative pressure to person in charge's net 5.
In Fig. 3: abandon pressure valve 2 and be arranged on a side of abandoning pressure water tank 3 top manholes 31, manhole cover 33 is provided with abandons the water inlet 32 of pressing water tank 3, and be positioned at above the side of abandoning pressure valve 2, abandon and press valve 2 to comprise valve seat 34, valve gap 35, link rod 36, cam 37 and exhaust floating drum 38, wherein valve seat 34 is fixedlyed connected with manhole 31 sidewalls, link rod 36 two ends are connected with the outer wall of valve gap 35 with valve seat 34 through active pin shaft respectively, cam 37 is positioned at bottom one side of valve seat 34, and flexibly connect with valve seat 34 bearing pins, exhaust floating drum 38 is positioned to abandon presses water tank 3 one ends to be weldingly fixed on the cam 37.
Its operating principle is: be responsible for net 5 hypotony and cause pressure and set when valve 1 is little to open or close, ftercompction tubing pump 9 continues to supply water will cause to abandon and presses negative pressure in the water tank 3, valve gap 35 is opened under atmospheric effect, when water level is reduced to certain value, exhaust floating drum 38 drives cam 37 valve gap 35 is withstood, valve gap 35 deadweights no longer produce negative pressure, and abandoning of this moment presses water tank 3 to become a reservoir fully, continue to keep the water supply operation of ftercompction tubing pump 9.Along with abandoning when pressing that water levels continue to be reduced to level sensor 8 in the water tank 3, control system will be controlled ftercompction tubing pump 9 and stop automatically supplying water, and this moment, holding state was gone at the device place.Recover just often when being responsible for net 5, pressure is set valve 1 and is opened, abandon and press water tank 3 water inlets, ftercompction tubing pump 9 resumes water supply automatically when treating that water level surpasses water level controller, be full of air in the jar of this moment, exhaust floating drum 38 water level do not raise do not put in place before, cam 37 holding in the palm valve gap 35 always, gas is discharged smoothly in jar, when exhaust floating drum 38 rises to when making cam 37 not hold up valve gap 35, valve gap 35 is closed by deadweight, abandoning after closing pressed also has little air in the water tank 3, gas plays the effect of good buffering pipe network pressure oscillation in jar.After valve gap 35 was closed, device was got back to normal ftercompction running status heavily again.Water inlet 32 Position Design purposes are to solve to abandon the valve antifreeze problem in 2 winters of pressing, and guarantee to abandon 2 flexible movements of pressure valve.
The utility model is obvious through back on probation power savings, can be energy-conservation, protected the even running of being responsible for net again, and alleviated the pressure oscillation amplitude, guarantee the normal water of user, excellent working performance.
Claims (5)
1, a kind of peak water is abandoned and is pressed moisturizing fully-automatic constant pressure water supply installation, it is characterized in that: comprise that being serially connected in tap water is responsible for net (5) and sets valve (1) with the pressure between user's pipe network (12), abandon and press valve (2), abandon pressure water tank (3) and ftercompction tubing pump (9), wherein abandon the top of pressing water tank (3) and set the output that valve (1) connects person in charge's net (5) through pressure, its bottom is provided with delivery port (7) and connects user's pipe network (12) through ftercompction tubing pump (9), and the top of abandoning pressure water tank (3) also is provided with to abandon presses valve (2).
2, peak as claimed in claim 1 water is abandoned and is pressed moisturizing fully-automatic constant pressure water supply installation, it is characterized in that: abandon and press valve (2) to be arranged on a side of abandoning pressure water tank (3) top manhole (31), manhole cover (33) is provided with abandons the water inlet (32) of pressing water tank (3), abandon and press valve (2) to comprise valve seat (34), valve gap (35), link rod (36), cam (37) and exhaust floating drum (38), wherein valve seat (34) is fixedlyed connected with manhole (31) sidewall, link rod (36) two ends are connected with the outer wall of valve gap (35) with valve seat (34) through active pin shaft respectively, cam (37) is positioned at bottom one side of valve seat (34), and flexibly connect with valve seat (34) bearing pin, exhaust floating drum (38) is positioned to abandon presses water tank (3) one end to be weldingly fixed on the cam (37).
3, peak as claimed in claim 1 water is abandoned and is pressed moisturizing fully-automatic constant pressure water supply installation, it is characterized in that: pressure is set valve (1) and is comprised valve body (13), valve rod (14), fairlead (15), Valve mouth cover (16), Valve mouth cover nut (17), piston (18), piston bush (19), pressure spring (20), screw press (21), spring housing (22), ventilation mouth (23), the spring seat of honour (24), spring lower seat (25) and valve bottom (26), wherein valve body (13) inner chamber is partitioned into intake antrum (27) and water chamber (28) correspondence and connects the water inlet (32) of being responsible for net (5) and abandoning pressure water tank (3), the valve port place shutoff that is communicated with in two chambeies is to be fixed on the Valve mouth cover (16) on the valve rod (14), valve rod (14) upper end is passed piston (18) and is threaded with spring lower seat (25), fixedly install a piston bush (19) in the valve body (13), piston (18) and piston bush (19) damping sealing, dock with valve body (13) upper surface the bottom of spring housing (22), and with the end face crimping of piston bush (19), the sidewall of spring housing (22) is provided with ventilation mouth (23), pressure spring (20) is by the spring seat of honour (24), spring lower seat (25) is vertically installed between spring housing (22) and the piston (18), screw press (21) passes spring housing (22) and the spring seat of honour (24) roof pressure from screw top, valve bottom (26) fixed sealing gets lodged in bottom and valve body (13) the formation spill cavity (29) that valve body (13) is positioned at intake antrum (27), in interval intake antrum (27), the sidewall of spill cavity (29) is provided with fairlead (15) and pod apertures (30), fairlead (15) is connected with sidewall thread, and valve rod (14) lower end is passed fairlead (15) by intake antrum (27) and entered in the spill cavity (29).
4, peak as claimed in claim 1 water is abandoned and pressed moisturizing fully-automatic constant pressure water supply installation, it is characterized in that: press the inside of water tank (3) to be provided with level sensor (8) abandoning, its bottom is provided with soil cleaning port (6).
5, peak as claimed in claim 1 water is abandoned and is pressed moisturizing fully-automatic constant pressure water supply installation, it is characterized in that: abandon and press water tank (3) user's pipe network (12) afterwards to be provided with 2 series connection ftercompction tubing pumps (9) that have flap valve (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2003201213962U CN2668709Y (en) | 2003-12-18 | 2003-12-18 | Pressure-relieve water-complementing full-automatic constant-pressure water-feeding device for use in peak-hour of water use |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2003201213962U CN2668709Y (en) | 2003-12-18 | 2003-12-18 | Pressure-relieve water-complementing full-automatic constant-pressure water-feeding device for use in peak-hour of water use |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2668709Y true CN2668709Y (en) | 2005-01-05 |
Family
ID=34439153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2003201213962U Expired - Fee Related CN2668709Y (en) | 2003-12-18 | 2003-12-18 | Pressure-relieve water-complementing full-automatic constant-pressure water-feeding device for use in peak-hour of water use |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2668709Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100336986C (en) * | 2005-07-28 | 2007-09-12 | 济南普利龙供水设备有限公司 | Technique of automatic water supply through forced suppression without suction lift |
| CN101525897B (en) * | 2009-03-30 | 2011-05-25 | 杭州电子科技大学 | Device for automatically utilizing secondary water |
| WO2015100502A1 (en) * | 2014-01-03 | 2015-07-09 | Massachusetts Institute Of Technology | Self-throttling valves for residential water supply systems |
| CN104848041A (en) * | 2015-05-25 | 2015-08-19 | 上海市质子重离子医院有限公司 | Rapid emergency constant-pressure device for proton heavy-ion accelerators |
| CN108692755A (en) * | 2018-05-03 | 2018-10-23 | 佛山市川东磁电股份有限公司 | A kind of gas sensor sealing device |
| CN112049194A (en) * | 2020-09-21 | 2020-12-08 | 王琳倩 | Non-negative pressure water supply equipment |
-
2003
- 2003-12-18 CN CNU2003201213962U patent/CN2668709Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100336986C (en) * | 2005-07-28 | 2007-09-12 | 济南普利龙供水设备有限公司 | Technique of automatic water supply through forced suppression without suction lift |
| CN101525897B (en) * | 2009-03-30 | 2011-05-25 | 杭州电子科技大学 | Device for automatically utilizing secondary water |
| WO2015100502A1 (en) * | 2014-01-03 | 2015-07-09 | Massachusetts Institute Of Technology | Self-throttling valves for residential water supply systems |
| CN104848041A (en) * | 2015-05-25 | 2015-08-19 | 上海市质子重离子医院有限公司 | Rapid emergency constant-pressure device for proton heavy-ion accelerators |
| CN104848041B (en) * | 2015-05-25 | 2018-02-06 | 上海市质子重离子医院有限公司 | One kind of proton heavy ion avcceleration quickly meet an urgent need constant-voltage equipment |
| CN108692755A (en) * | 2018-05-03 | 2018-10-23 | 佛山市川东磁电股份有限公司 | A kind of gas sensor sealing device |
| CN112049194A (en) * | 2020-09-21 | 2020-12-08 | 王琳倩 | Non-negative pressure water supply equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN2668709Y (en) | Pressure-relieve water-complementing full-automatic constant-pressure water-feeding device for use in peak-hour of water use | |
| CN2777077Y (en) | Water supply apparatus with energy-storage and water storage means for closet | |
| CN201016182Y (en) | Touching drainage valve | |
| CN101886418A (en) | Enclosed pressure tank for sanitary ware. | |
| CN209925311U (en) | Pneumatic drive quantitative lifting device | |
| CN2219905Y (en) | Automatic opening or closing water-taking device by reservoir buoyancy | |
| CN2784471Y (en) | Energy-collecting, water-storing full automatic pressure-supplementing water supplier | |
| CN2604536Y (en) | Water pump with wave as dynamic power | |
| CN2784641Y (en) | Pulsometer pump | |
| CN2668719Y (en) | Water-saving toilet flushing device | |
| CN2818957Y (en) | High-pressure float valve | |
| CN200952162Y (en) | Main flushing with waste water secondary flushing with clean water water-saving and energy-saving closet flushing device | |
| CN201738409U (en) | Airtight pressure water tank for sanitary appliance | |
| CN218474925U (en) | Sludge discharge device for sewage treatment | |
| CN210950048U (en) | Floating box type flap valve convenient to adjust | |
| CN2525314Y (en) | Differential pressure automatic water control valve | |
| CN220529002U (en) | Novel micro-overflow bottom-filtering fish tank operation system | |
| CN221703909U (en) | Material pump with discharging quantity convenient to control | |
| CN219911162U (en) | Self-adjusting constant flow water supply device in pump set | |
| CN210505632U (en) | High-efficient sewage treatment device | |
| CN2758658Y (en) | Automatic control valve for household solar water heater | |
| CN207917661U (en) | A kind of dewatering in siphon type oil storage tank pressure oil-return type automatic dewatering unit | |
| CN112594231B (en) | Tail water recovery mechanism of hydraulic ram | |
| CN2410487Y (en) | Backwater valve | |
| CN2282563Y (en) | Air-pressure type water saver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |