CN103615579A - Water-saving type backflow preventer structure - Google Patents
Water-saving type backflow preventer structure Download PDFInfo
- Publication number
- CN103615579A CN103615579A CN201310631017.2A CN201310631017A CN103615579A CN 103615579 A CN103615579 A CN 103615579A CN 201310631017 A CN201310631017 A CN 201310631017A CN 103615579 A CN103615579 A CN 103615579A
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- Prior art keywords
- valve
- water
- backflow preventer
- valve rod
- main
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- 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
- F16K15/00—Check valves
- F16K15/18—Check valves with actuating mechanism; Combined check valves and actuated valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
- Safety Valves (AREA)
Abstract
The invention provides a water-saving type backflow preventer structure which comprises a shell body, a water inlet valve, a water outlet valve, a water escape valve and a main valve rod, wherein the water inlet valve, the water outlet valve, the water escape valve and the main valve rod are located inside the shell body. The water-saving type backflow preventer structure further comprises an elastic sealing device, wherein the elastic sealing device divides the interior of the shell body into a main cavity and a control cavity, the shell wall of the main cavity is provided with a water inlet, a water outlet and a drainage opening, the water inlet valve, the water outlet calve and the water escape valve are installed on the water inlet, the water outlet and the drainage opening respectively, one end of the main valve rod is connected with the water escape valve, and the other end of the main valve rod is connected with the elastic sealing device; the water inlet valve comprises a valve base, a valve plate, a valve rod and a reset device, the contact surface between the outer side of the valve base and the valve plate is provided with two sealing lines, and a plurality of channels are arranged between the two sealing lines and penetrate through the valve base and the shell body to be communicated with the control cavity. The water-saving type backflow preventer structure has the advantages that when pressure of the inlet of the backflow preventer fluctuates, the water escape valve cannot be frequently opened to drain water, and waste of water resources is avoided.
Description
Technical field
The present invention relates to a kind of backflow preventer, especially relate to a kind of water-saving backflow preventer structure.
Background technique
Current municipal water supply pressure transient, cause the water intake pressure of backflow preventer can produce fluctuation, when inlet pressure undulating value is greater than the drain valve starting differential pressure value Δ p of backflow preventer, the discharge opening of general backflow preventing structure can be opened to reduce middle pressure and meet Δ p value, in use can there is interrupted sluicing phenomenon when water (particularly in backflow preventer downstream not) in backflow preventer like this, causes the waste of water resources.This is not the sole mass problem of product, but municipal water supply working condition pressure changing value surpasses backflow preventer drain valve, opens settings, causes the unlatching of backflow preventer drain valve to cause.Therefore a lot of water utilities all refuse to use to backflow preventer, and one of reason is exactly to dislike water waste serious.If can not fundamentally not guarantee that again water quality is not polluted but do not install backflow preventer additional, this just needs a kind of structure, when normal water supply, when fluctuation occurs water intake pressure, can prevent intermittently opening of drain valve.
Summary of the invention
The object of this invention is to provide a kind of simple in structure, safe and reliable water-saving backflow preventer structure.
Technological scheme of the present invention is: a kind of water-saving backflow preventer structure, comprise housing and the inlet valve that is positioned at described enclosure interior, outlet valve, drain valve and main valve stem, also comprise elastic sealing device, described elastic sealing device is divided into main chamber and two cavitys of control chamber by described enclosure interior, wherein on the shell wall in main chamber with water intake, these three openings of water outlet and discharge opening, described inlet valve, outlet valve and drain valve are arranged on respectively this three openings, one end of described main valve stem is connected with described drain valve, the other end is connected with described elastic sealing device,
Described inlet valve comprises valve seat, valve plate, valve rod and resetting means, one end of described valve rod is successively through described resetting means, valve seat and valve plate, described valve plate is fixedly connected with one end of described valve rod, described valve seat is connected with valve handle activity, and described resetting means is fixed on the other end of described valve rod;
Described valve seat outside is provided with two seals line with the surface of contact of described valve plate, between described two seals line, is provided with some passwaies, and described passway is communicated with described control chamber by the passage of valve seat and enclosure interior.
Preferably, the two seals line on described valve seat is annular projection, when described valve plate contacts with projection, can play sealing effect.
Preferably, described resetting means be end cap and and spring, described end cap is fixed on the other end of described valve rod, one end of described spring props up described end cap, the other end is fixed on described valve seat.
Preferably, described elastic sealing device is elastomer diaphragm.
Preferably, between described valve plate and described valve rod, be provided with seal ring.
Advantage and good effect that the present invention has are:
Owing to adopting technique scheme, normal water supply and valve are when dead head condition, and now valve plate is close to valve seat under the effect of resetting means, and control chamber becomes an airtight cavity, and pressure is P2.While declining if inlet pressure P1 value produces fluctuation, valve plate is still close to valve seat, and P2 value can not change, so Δ P value can not change, and drain valve can not opened sluicing.Like this, when backflow preventer inlet pressure produces fluctuation, drain valve can frequently not opened sluicing, avoids the waste of water resources.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of valve seat part in the present invention.
In figure:
1, housing 2, water intake 3, valve rod 4, resetting means
5, valve plate 6, valve seat 7, main chamber 8, control chamber
9, water outlet 10, discharge opening 11, main valve stem 12, elastic sealing device
Embodiment
Below in conjunction with the drawings and the specific embodiments, the invention will be further described.
As depicted in figs. 1 and 2, the present invention includes housing 1 and the inlet valve that is positioned at described housing 1 inside, outlet valve, drain valve and main valve stem, also comprise the elastic sealing device 12 that elastomer diaphragm is made, described elastic sealing device 12 is main chamber 7 and 8 two cavitys of control chamber by described housing 1 interior separation, wherein on the shell wall in main chamber 7 with water intake 2, water outlet 9 and discharge opening 10 these three openings, described inlet valve, outlet valve and drain valve are arranged on respectively this three openings, one end of described main valve stem 11 is connected with described drain valve, the other end is connected with described elastic sealing device 12,
Described inlet valve comprises valve seat 6, valve plate 5, valve rod 3 and resetting means 4, one end of described valve rod 3 is successively through described resetting means 4, valve seat 6 and valve plate 5, described valve plate 5 is fixedly connected with one end of described valve rod 3, described valve seat 6 is flexibly connected with valve rod 3, and described resetting means 4 is fixed on the other end of described valve rod 3;
The surface of contact of described valve seat 6 outsides and described valve plate 5 is provided with the potted line that twice ring-type convexes to form, and between described two seals line, is provided with some passwaies, and described passway is communicated with described control chamber 8 by the passage of valve seat 6 and housing 1 inside.When described valve plate 5 contacts with projection, can play sealing effect.
Described resetting means 4 be end cap and and spring, described end cap is fixed on the other end of described valve rod 3, one end of described spring props up described end cap, the other end is fixed on described valve seat 6.
Between described valve plate 5 and described valve rod 3, be provided with seal ring.
During use, inlet pressure is P1, and control chamber pressure is P2, and main cavity pressure is P3, and outlet pressure is P4.P1=P2 under proper flow state, P2-P3=Δ P, this Δ P value is controlled drain valve in closed condition.When Δ P is less than certain setting numerical value, P3 oppresses elastic sealing device 12, drives on main valve stem 11 and lifts, thereby open drain valve.
When normal water supply and valve are during in dead head condition, now valve plate is close to valve seat under the effect of resetting means, and control chamber becomes an airtight cavity, and pressure is P2.While declining if inlet pressure P1 value produces fluctuation, valve plate is still close to valve seat, and P2 value can not change, so Δ P value also can not change, and drain valve can not opened sluicing.
Like this, when backflow preventer inlet pressure produces fluctuation, drain valve can frequently not opened sluicing, avoids the waste of water resources.
Above embodiment has been described in detail the present invention, but described content is only preferred embodiment of the present invention, can not be considered to for limiting practical range of the present invention.All equalization variations of doing according to the present patent application scope and improvement etc., within all should still belonging to patent covering scope of the present invention.
Claims (5)
1. a water-saving backflow preventer structure, comprise housing (1) and be positioned at the inner inlet valve of described housing (1), outlet valve, drain valve and main valve stem, it is characterized in that: also comprise elastic sealing device (12), described elastic sealing device (12) is main chamber (7) and (8) two cavitys of control chamber by described housing (1) interior separation, wherein on the shell wall of main chamber (7) with water intake (2), these three openings of water outlet (9) and discharge opening (10), described inlet valve, outlet valve and drain valve are arranged on respectively this three openings, one end of described main valve stem (11) is connected with described drain valve, the other end is connected with described elastic sealing device (12),
Described inlet valve comprises valve seat (6), valve plate (5), valve rod (3) and resetting means (4), one end of described valve rod (3) is successively through described resetting means (4), valve seat (6) and valve plate (5), described valve plate (5) is fixedly connected with one end of described valve rod (3), described valve seat (6) is flexibly connected with valve rod (3), and described resetting means (4) is fixed on the other end of described valve rod (3);
Described valve seat (6) outside is provided with two seals line with the surface of contact of described valve plate (5), between described two seals line, is provided with some passwaies, and described passway is communicated with described control chamber (8) by valve seat (6) and the inner passage of housing (1).
2. water-saving backflow preventer structure according to claim 1, is characterized in that: the two seals line on described valve seat (6) is annular projection, when described valve plate (5) contacts with described projection, can play sealing effect.
3. water-saving backflow preventer structure according to claim 1 and 2, it is characterized in that: described resetting means (4) for end cap and and spring, described end cap is fixed on the other end of described valve rod (3), one end of described spring props up described end cap, and the other end is fixed on described valve seat (6).
4. water-saving backflow preventer structure according to claim 1 and 2, is characterized in that: described elastic sealing device (12) is elastomer diaphragm.
5. water-saving backflow preventer structure according to claim 1 and 2, is characterized in that: between described valve plate (5) and described valve rod (3), be provided with seal ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310631017.2A CN103615579A (en) | 2013-11-28 | 2013-11-28 | Water-saving type backflow preventer structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310631017.2A CN103615579A (en) | 2013-11-28 | 2013-11-28 | Water-saving type backflow preventer structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103615579A true CN103615579A (en) | 2014-03-05 |
Family
ID=50166290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310631017.2A Pending CN103615579A (en) | 2013-11-28 | 2013-11-28 | Water-saving type backflow preventer structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103615579A (en) |
-
2013
- 2013-11-28 CN CN201310631017.2A patent/CN103615579A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140305 |