CN215522107U - Low-resistance backflow preventer - Google Patents
Low-resistance backflow preventer Download PDFInfo
- Publication number
- CN215522107U CN215522107U CN202122119332.XU CN202122119332U CN215522107U CN 215522107 U CN215522107 U CN 215522107U CN 202122119332 U CN202122119332 U CN 202122119332U CN 215522107 U CN215522107 U CN 215522107U
- Authority
- CN
- China
- Prior art keywords
- water
- cavity
- valve
- water outlet
- check valve
- 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.)
- Active
Links
Images
Landscapes
- Check Valves (AREA)
Abstract
The utility model relates to the technical field of valves, and discloses a low-resistance backflow preventer, which comprises a valve body, a water inlet check valve group, a water outlet check valve group and a water drain valve group, wherein the water inlet check valve group is connected between a water inlet cavity and a middle cavity of the valve body, the water outlet check valve group is connected between the water outlet cavity and the middle cavity of the valve body, the water drain valve group is connected with a lower port of the middle cavity through a connecting bolt, and the water drain valve group can be disassembled and assembled on the valve body, so that an operator can perform online maintenance and overhaul on the low-resistance backflow preventer. The valve body is internally provided with a water inlet control waterway and a water outlet control waterway, the water inlet control waterway is communicated between the water inlet cavity and the diaphragm control chamber, the water outlet control waterway is communicated between the water outlet cavity and the diaphragm control chamber, the water outlet valve seat is provided with a water outlet communicated with the middle cavity, and a water outlet action component in the water outlet valve group can control the opening and closing of the water outlet under the action of pressure difference in the diaphragm control chamber, so that the low-resistance backflow preventer realizes the drainage of the middle cavity and separates the water inlet cavity from the water outlet cavity.
Description
Technical Field
The utility model relates to the technical field of valves, in particular to a low-resistance backflow preventer.
Background
In the existing low-resistance backflow preventer, a drain valve usually adopts an externally-hung form, and an upper cavity and a lower cavity which are respectively connected to an external control pipeline from a water inlet cavity and a water outlet cavity to a control chamber of the drain valve are used for controlling the opening and closing of the drain valve. The external control pipeline is easily damaged or destroyed by collision in the using process, so that the control of the low-resistance backflow preventer is disabled or water leakage occurs, and the normal use is influenced. Simultaneously, the check valve plate that intakes can drive the valve rod with play water check valve plate under the effect of rivers and produce rotatoryly, can cause the serious wear of valve rod and disk seat cooperation department on the one hand, and on the other hand can cause the valve rod to become flexible with being connected of valve plate, and then leads to the valve plate to break away from the valve rod and loses the effect of non return.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a low-resistance backflow preventer, which is not only not easy to damage and high in safety, but also convenient to disassemble and assemble internal components, and is beneficial to online maintenance and overhaul of the low-resistance backflow preventer.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a low resistance backflow preventer comprising: the water inlet cavity and the water outlet cavity are respectively communicated with two ends of the middle cavity, and the middle cavity is provided with a lower opening; the water inlet check valve group is detachably connected between the water inlet cavity and the middle cavity; the water outlet check valve group is detachably connected between the water outlet cavity and the middle cavity; the water release valve group, the water release valve group pass through connecting bolt detachably connect in the end opening, be equipped with into water control water route and play water control water route in the valve body, the water release valve group includes diaphragm control room, water release valve disk seat and sluicing action subassembly, the control water route of intaking communicate in the intake antrum with between the diaphragm control room, play water control water route communicate in go out the water cavity with between the diaphragm control room, be equipped with on the water release valve disk seat with the sluicing mouth of middle chamber intercommunication, sluicing action subassembly part is arranged in the diaphragm control room, sluicing action subassembly can realize under the effect of pressure differential in the diaphragm control room the opening and shutting of sluicing mouth.
As an optimal scheme of low resistance backflow preventer, the check valve that intakes includes water inlet valve plate subassembly, intake valve seat, the check valve rod that intakes and the check valve spring that intakes, intake valve seat connect in on the valve body, the check valve rod that intakes slides and wears to locate among the intake valve seat, water inlet valve plate subassembly connect in the one end of check valve rod that intakes can seal support hold in the intake antrum with the junction of intermediate chamber, the check valve spring housing that intakes is located on the check valve rod that intakes, the one end of check valve spring that intakes connect in intake valve seat, the other end of check valve spring that intakes connect in the check valve rod that intakes.
As a preferred scheme of the low-resistance backflow preventer, the part of the water inlet check valve rod penetrating through the water inlet valve seat is a waist-shaped rod or a spline rod.
As an optimal scheme of low resistance backflow preventer, go out the water check valve and include outlet valve plate subassembly, play water disk seat, play water check valve rod and play water check valve spring, outlet valve seat connect in on the valve body, it wears to locate to go out the water check valve rod slip in going out the water disk seat, outlet valve plate subassembly connect in the one end of play water check valve rod can seal support hold in go out the water cavity with the junction of middle chamber, it locates to go out water check valve spring housing go out on the water check valve rod, the one end of going out water check valve spring connect in go out the water disk seat, the other end of play water check valve spring connect in go out the water check valve rod.
As a preferred scheme of the low-resistance backflow preventer, the part of the water outlet check valve rod penetrating through the water outlet valve seat is a waist-shaped rod or a spline rod.
As an optimal scheme of low resistance backflow preventer, the diaphragm control room includes upper cover, lower cover and diaphragm clamp plate, the upper cover with lower cover sealing connection forms the control chamber, diaphragm clamp plate sealing connection in the upper cover with between the lower cover and with the control chamber is separated for control epicoele and control cavity of resorption, be equipped with first water route and second water route in the upper cover, be equipped with the third water route in the lower cover, first water route communicate in intake control water route with between the control epicoele, the third water route communicate in the control cavity of resorption, the second water route communicate in the third water route with between the control water route.
As a preferred scheme of low resistance refluence preventer, sluicing action subassembly includes outlet valve rod, outlet valve plate and outlet valve spring, the at least partial cover of outlet valve spring is located on the outlet valve rod, the one end of outlet valve spring communicate in the outlet valve rod, the other end of outlet valve spring connect in the outlet valve disk seat, the lower cover is worn in the sealed slip of outlet valve rod, the diaphragm clamp plate with the outlet valve plate all connect in on the outlet valve rod, the outlet valve plate can seal support hold in the outlet.
As a preferred scheme of low resistance backflow preventer, the outlet valve valves still include the adjustable ring, the adjustable ring position connect in adjustably in the outlet, the outlet valve spring is kept away from the one end of outlet valve rod connect in the adjustable ring.
As a preferred scheme of the low-resistance backflow preventer, a communicating cavity is formed between the drain valve seat and the lower cover, the communicating cavity is communicated between the middle cavity and the drain opening, and the valve plate of the drain valve is arranged in the communicating cavity.
As an optimal selection scheme of the low-resistance backflow preventer, the low-resistance backflow preventer further comprises a valve cover, an upper opening is formed in the middle cavity, and the valve cover is detachably and hermetically connected to the upper opening.
The utility model has the beneficial effects that:
the utility model provides a low-resistance backflow preventer, which comprises a valve body, a water inlet check valve group, a water outlet check valve group and a water drain valve group, wherein the water inlet check valve group is detachably connected between a water inlet cavity and a middle cavity of the valve body, the water outlet check valve group is detachably connected between a water outlet cavity and the middle cavity of the valve body, and the water drain valve group is connected with a lower port of the middle cavity through a connecting bolt, so that the water inlet check valve group, the water outlet check valve group and the water drain valve group can be conveniently assembled and disassembled on line from the valve body, the quick assembly and disassembly of internal components of the low-resistance backflow preventer are realized, and the online maintenance and the overhaul of the low-resistance backflow preventer are facilitated for operators. The low-resistance backflow preventer has the advantages that the water inlet control water path and the water outlet control water path are arranged in the valve body, the arrangement of an external pipeline is avoided, the safety of the low-resistance backflow preventer is improved, the water inlet control water path is communicated between the water inlet cavity and the diaphragm control chamber, the water outlet control water path is communicated between the water outlet cavity and the diaphragm control chamber, the water outlet valve seat is provided with a water outlet communicated with the middle cavity, and the water outlet action component in the water outlet valve set can control the opening and closing of the water outlet under the action of pressure difference in the diaphragm control chamber, so that the low-resistance backflow preventer realizes water drainage of the middle cavity, separates the water inlet cavity from the water outlet cavity, and avoids pollution between media in the water inlet cavity and the water outlet cavity.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a sectional view of a low resistance backflow preventer provided by an embodiment of the present invention.
In the figure:
1. a valve body; 11. a water inlet cavity; 12. a middle cavity; 13. a water outlet cavity; 2. a water inlet check valve group; 21. a water inlet valve plate assembly; 22. a water inlet valve seat; 23. a water inlet check valve stem; 24. a water inlet check valve spring; 3. a water outlet check valve group; 31. a water outlet valve plate component; 32. a water outlet valve seat; 33. a water outlet check valve stem; 34. a water outlet check valve spring; 4. a water escape valve bank; 41. a water inlet control waterway; 42. a water outlet control waterway; 43. a water escape valve seat; 44. a water discharge opening; 45. an upper cover; 451. a first waterway; 452. a second waterway; 46. a lower cover; 461. a third waterway; 47. a diaphragm pressing plate; 48. controlling the upper cavity; 49. controlling the lower cavity; 401. a drain valve stem; 402. a drain valve plate; 403. a water escape valve spring; 404. an adjusting ring; 410. a communicating cavity; 411. and a valve cover.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first feature is directly connected to the second feature, or that the first feature is not directly connected to the second feature but is connected to the second feature via another feature. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical scheme of the low-resistance backflow preventer provided by the utility model is further explained by combining the attached drawings and through a specific implementation mode.
As shown in fig. 1, the present embodiment provides a low resistance backflow preventer, which comprises a valve cover 411, a valve body 1, a water inlet check valve set 2, a water outlet check valve set 3, and a water outlet check valve set 4, wherein the valve body 1 is provided with a water inlet cavity 11, an intermediate cavity 12, and a water outlet cavity 13, the water inlet cavity 11 and the water outlet cavity 13 are respectively communicated with two ends of the intermediate cavity 12, that is, the intermediate cavity 12 is communicated between the water inlet cavity 11 and the water outlet cavity 13, the intermediate cavity 12 is provided with an upper opening and a lower opening, the valve cover 411 is detachably connected to the upper opening in a sealing manner, the water outlet check valve set 4 is detachably connected to the lower opening via a connecting bolt, the water inlet check valve set 2 is detachably connected between the water inlet cavity 11 and the intermediate cavity 12, the water outlet check valve set 3 is detachably connected between the water outlet cavity 13 and the intermediate cavity 12, so that the water inlet check valve set 2 and the water outlet check valve set 3 can be conveniently detached and installed from the upper opening, the water escape valve block 4 can be conveniently detached and installed at the lower opening.
Through the structure, the water inlet check valve group 2, the water outlet check valve group 3 and the water drain valve group 4 can be conveniently disassembled and assembled on the valve body 1, so that the quick disassembly and assembly of the internal components of the low-resistance backflow preventer are realized, the online maintenance and overhaul of the low-resistance backflow preventer are facilitated for an operator, and the maintenance and the replacement of internal parts can be completed without disassembling the valve body 1 from a pipeline.
In this embodiment, the valve body 1 is provided with a water inlet control water path 41 and a water outlet control water path 42, the water drain valve group 4 includes a diaphragm control chamber, a water drain valve seat 43 and a water drain action component, the water inlet control water path 41 is communicated between the water inlet cavity 11 and the diaphragm control chamber, the water outlet control water path 42 is communicated between the water outlet cavity 13 and the diaphragm control chamber, the water drain valve seat 43 is provided with a water drain opening 44 communicated with the intermediate cavity 12, the water drain action component is at least partially disposed in the diaphragm control chamber, and the water drain action component can open and close the water drain opening 44 under the action of pressure difference in the diaphragm control chamber, so that the low-resistance backflow preventer can drain the intermediate cavity 12, separate the water inlet cavity 11 from the water outlet cavity 13, and prevent the medium in the two from being polluted.
It should be noted that the arrangement of the water inlet control water path 41 and the water outlet control water path 42 in the valve body 1 avoids the arrangement of external pipelines, can prevent the pipelines from being damaged due to collision, and improves the safety of the low-resistance backflow preventer.
Specifically, the water inlet check valve includes a water inlet valve plate assembly 21, a water inlet valve seat 22, a water inlet check valve stem 23 and a water inlet check valve spring 24, and the water inlet valve seat 22 is connected to the valve body 1 by a connecting bolt, so that the water inlet check valve can be conveniently disassembled and assembled on the valve body 1. The water inlet check valve rod 23 penetrates through the water inlet valve seat 22 in a sliding mode, and the water inlet valve plate assembly 21 is connected to one end of the water inlet check valve rod 23 and can be abutted to the joint of the water inlet cavity 11 and the middle cavity 12 in a sealing mode, so that the water inlet cavity 11 and the middle cavity 12 are isolated in a sealing mode. The check valve spring 24 that intakes is located on the check valve rod 23 that intakes, and the one end of the check valve spring 24 that intakes is connected in intake valve seat 22, and the other end of the check valve spring 24 that intakes is connected in the check valve rod 23 that intakes for the check valve rod 23 that intakes can drive the water intake valve plate subassembly 21 under the hydraulic effect of check valve spring 24 that intakes and intake antrum 11 and realize the intercommunication and the isolation of intake antrum 11 and lumen 12.
Preferably, the part of the water inlet check valve rod 23 penetrating the water inlet valve seat 22 is a waist-shaped rod or a spline rod, that is, the cross-sectional shape of the part of the water inlet check valve rod 23 penetrating the water inlet valve seat 22 is waist-shaped or is provided with splines, so that the water inlet check valve rod 23 cannot rotate, the water inlet check valve rod 23 is prevented from rotating under the impact action of a medium by the water inlet valve plate assembly 21, the phenomenon that the water inlet valve plate assembly 21 loosens and falls off or the water inlet check valve rod 23 and the central hole of the water inlet valve seat 22 are abraded is improved, and the service life of the low-resistance backflow preventer is prolonged.
In this embodiment, the water outlet check valve includes a water outlet valve plate assembly 31, a water outlet valve seat 32, a water outlet check valve stem 33 and a water outlet check valve spring 34, the water outlet valve seat 32 is connected to the valve body 1, the water outlet check valve stem 33 is slidably disposed in the water outlet valve seat 32, the water outlet valve plate assembly 31 is connected to one end of the water outlet check valve stem 33 and can be sealingly abutted to a connection portion of the water outlet cavity 13 and the middle cavity 12, so as to achieve the sealing isolation between the water outlet cavity 13 and the middle cavity 12. The water outlet check valve spring 34 is sleeved on the water outlet check valve rod 33, one end of the water outlet check valve spring 34 is connected to the water outlet valve seat 32, and the other end of the water outlet check valve spring 34 is connected to the water outlet check valve rod 33, so that the water outlet check valve rod 33 can drive the water outlet valve plate assembly 31 to realize the communication and isolation of the water outlet cavity 13 and the middle cavity 12 under the action of the water pressure of the water outlet check valve spring 34 and the water outlet cavity 13.
Preferably, the part of the water outlet check valve rod 33 penetrating the water outlet valve seat 32 is a waist-shaped rod or a spline rod, that is, the cross-sectional shape of the part of the water outlet check valve rod 33 penetrating the water outlet valve seat 32 is waist-shaped or is provided with splines, so that the water outlet check valve rod 33 cannot rotate, the water outlet check valve rod 33 is prevented from rotating under the impact action of a medium by the water outlet valve plate assembly 31, the phenomenon that the water outlet valve plate assembly 31 loosens and falls off or the water outlet check valve rod 33 and the center hole of the water outlet valve seat 32 are abraded is improved, and the service life of the low-resistance backflow preventer is prolonged.
In this embodiment, the diaphragm control chamber includes an upper cover 45, a lower cover 46 and a diaphragm pressure plate 47, the upper cover 45 and the lower cover 46 are connected in a sealing manner to form a control chamber and are connected to the water release valve set 4, the diaphragm pressure plate 47 is connected between the upper cover 45 and the lower cover 46 in a sealing manner to divide the control chamber into a control upper chamber 48 and a control lower chamber 49, a first water path 451 and a second water path 452 are provided in the upper cover 45, a third water path 461 is provided in the lower cover 46, the first water path 451 is communicated between the water inlet control water path 41 and the control upper chamber 48, the third water path 461 is communicated with the control lower chamber 49, the second water path 452 is communicated between the third water path 461 and the water outlet control water path 42, so that the medium in the water inlet chamber 11 can enter the control upper chamber 48 through the water inlet control water path 41 and the first water path 451 in sequence, so that the medium in the water outlet chamber 13 can enter the control lower chamber 49 through the water path 42, the second water path 452 and the third water path 461 in sequence, the diaphragm pressing plate 47 operates due to a difference in water pressure formed between both sides.
Specifically, the drain action assembly comprises a drain valve rod 401, a drain valve plate 402 and a drain valve spring 403, wherein at least part of the drain valve spring 403 is sleeved on the drain valve rod 401, one end of the drain valve spring 403 is communicated with the drain valve rod 401, the other end of the drain valve spring 403 is connected to the drain valve seat 43, the lower cover 46 is arranged on the drain valve rod 401 in a sealing and sliding mode, the diaphragm pressing plate 47 and the drain valve plate 402 are connected to the drain valve rod 401, the drain valve plate 402 can be in sealing and abutting contact with the drain opening 44, and the diaphragm pressing plate 47 can drive the drain valve rod 401 to act under the action of the water pressure difference between the two sides, so that the drain valve plate 402 can open and close the drain opening 44.
Preferably, a communication cavity 410 is formed between the drain valve seat 43 and the lower cover 46, the communication cavity 410 is communicated between the intermediate cavity 12 and the drain opening 44, the communication cavity 410 can provide a moving space and a mounting space for the drain valve plate 402, and the drain valve plate 402 is placed in the communication cavity 410 and used for realizing the opening and closing of the drain opening 44.
In this embodiment, the bleed valve block 4 further includes an adjusting ring 404, the adjusting ring 404 is connected to the bleed opening 44 in a position-adjustable manner, and one end of the bleed valve spring 403 remote from the bleed valve stem 401 abuts against the adjusting ring 404. Specifically, an internal thread is arranged in the drain opening 44, an external thread is arranged on the adjusting ring 404, the adjusting ring 404 can be screwed in the drain opening 44 to adjust the position, so that the pre-tightening force of the drain valve spring 403 can be adjusted, the opening acting force of the drain valve plate 402 can be changed, errors generated in manufacturing can be eliminated, and the quick action of the drain valve plate 402 under the preset pressure difference can be accurately ensured to open the drain opening 44.
The operation of the low resistance backflow preventer provided by the present invention will be described below.
When water is normally supplied, the pressure of the medium in the water inlet cavity 11 acts on the control upper cavity 48, the pressure of the medium in the water outlet cavity 13 acts on the control lower cavity 49, and as the pressure of the medium in the water inlet cavity 11 is greater than the pressure of the medium in the water outlet cavity 13, the valve plate 402 of the drain valve is tightly attached to the sealing surface of the drain opening 44, the drain opening 44 is closed, and the medium in the valve body 1 normally flows. When the pressure of the medium in the water inlet cavity 11 is less than or equal to the pressure of the medium in the water outlet cavity 13, the water inlet check valve group 2 and the water outlet check valve group 3 are both closed, and simultaneously the diaphragm pressing plate 47 moves upwards under the action of the pressure difference on the two sides of the diaphragm pressing plate 47 and the action of the drain valve spring 403 to drive the drain valve plate 402 to leave the sealing surface of the drain opening 44, the drain valve is opened, the medium in the middle cavity 12 is discharged out of the valve body 1, air enters the middle cavity 12 to separate the medium in the water inlet cavity 11 from the medium in the water outlet cavity 13, and pollution caused by the contact of the medium in the water inlet cavity 11 and the medium in the water outlet cavity 13 is avoided.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the utility model. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A low resistance backflow preventer, comprising:
the water inlet valve comprises a valve body (1), wherein a water inlet cavity (11), a middle cavity (12) and a water outlet cavity (13) are arranged in the valve body (1), the water inlet cavity (11) and the water outlet cavity (13) are respectively communicated with two ends of the middle cavity (12), and the middle cavity (12) is provided with a lower opening;
the water inlet check valve group (2), wherein the water inlet check valve group (2) is detachably connected between the water inlet cavity (11) and the middle cavity (12);
the water outlet check valve group (3), the water outlet check valve group (3) is detachably connected between the water outlet cavity (13) and the middle cavity (12);
a water escape valve set (4), wherein the water escape valve set (4) is detachably connected to the lower opening through a connecting bolt, a water inlet control waterway (41) and a water outlet control waterway (42) are arranged in the valve body (1), the water escape valve group (4) comprises a diaphragm control chamber, a water escape valve seat (43) and a water escape action component, the water inlet control waterway (41) is communicated between the water inlet cavity (11) and the diaphragm control chamber, the water outlet control waterway (42) is communicated between the water outlet cavity (13) and the membrane control chamber, a water outlet (44) communicated with the middle cavity (12) is arranged on the water outlet valve seat (43), the water draining action assembly is partially arranged in the diaphragm control chamber and can realize the opening and closing of the water draining opening (44) under the action of pressure difference in the diaphragm control chamber.
2. The low resistance backflow preventer of claim 1, wherein the inlet check valve comprises an inlet valve plate assembly (21), an inlet valve seat (22), an inlet check valve stem (23), and an inlet check valve spring (24), the water inlet valve seat (22) is connected on the valve body (1), the water inlet check valve rod (23) is slidably arranged in the water inlet valve seat (22), the water inlet valve plate component (21) is connected to one end of the water inlet check valve rod (23) and can be sealed and propped against the joint of the water inlet cavity (11) and the middle cavity (12), the water inlet check valve spring (24) is sleeved on the valve rod (23) of the water inlet check valve, one end of the water inlet check valve spring (24) is connected to the water inlet valve seat (22), the other end of the water inlet check valve spring (24) is connected to the water inlet check valve stem (23).
3. Low resistance backflow preventer according to claim 2, characterized in that the part of the inlet check valve stem (23) passing through the inlet valve seat (22) is a waist-shaped rod or a splined rod.
4. Low resistance backflow preventer according to claim 1, wherein the outlet check valve comprises an outlet valve plate assembly (31), an outlet valve seat (32), an outlet check valve stem (33) and an outlet check valve spring (34), the water outlet valve seat (32) is connected to the valve body (1), the water outlet check valve rod (33) is slidably arranged in the water outlet valve seat (32), the water outlet valve plate component (31) is connected with one end of the water outlet check valve rod (33) and can be sealed and propped against the joint of the water outlet cavity (13) and the middle cavity (12), the water outlet check valve spring (34) is sleeved on the valve rod (33) of the water outlet check valve, one end of the water outlet check valve spring (34) is connected with the water outlet valve seat (32), the other end of the water outlet check valve spring (34) is connected to the water outlet check valve rod (33).
5. Low resistance backflow preventer according to claim 4, characterized in that the part of the outlet check valve stem (33) penetrating the outlet valve seat (32) is a waist-shaped rod or a splined rod.
6. Low resistance backflow preventer according to claim 1, wherein the diaphragm control chamber comprises an upper cover (45), a lower cover (46) and a diaphragm pressure plate (47), the upper cover (45) and the lower cover (46) are connected in a sealing way to form a control cavity, the diaphragm pressure plate (47) is connected between the upper cover (45) and the lower cover (46) in a sealing way and divides the control cavity into a control upper cavity (48) and a control lower cavity (49), a first water channel (451) and a second water channel (452) are arranged in the upper cover (45), a third water path (461) is arranged in the lower cover (46), the first water path (451) is communicated between the water inlet control water path (41) and the control upper cavity (48), the third water path (461) is communicated with the lower control cavity (49), and the second water path (452) is communicated between the third water path (461) and the water outlet control water path (42).
7. The low resistance backflow preventer of claim 6, wherein the drain actuating assembly comprises a drain valve stem (401), a drain valve plate (402), and a drain valve spring (403), wherein the drain valve spring (403) is at least partially sleeved on the drain valve stem (401), one end of the drain valve spring (403) is communicated with the drain valve stem (401), the other end of the drain valve spring (403) is connected to the drain valve seat (43), the drain valve stem (401) is slidably and sealingly provided with a lower cover (46), the diaphragm pressing plate (47) and the drain valve plate (402) are both connected to the drain valve stem (401), and the drain valve plate (402) can be sealingly abutted against the drain opening (44).
8. The low resistance backflow preventer of claim 7, wherein the drain valve block (4) further comprises an adjusting ring (404), the adjusting ring (404) being position-adjustably connected in the drain opening (44), an end of the drain valve spring (403) remote from the drain valve stem (401) being connected to the adjusting ring (404).
9. A low resistance backflow preventer according to claim 7, wherein a communication chamber (410) is formed between the drain valve seat (43) and the lower cover (46), the communication chamber (410) communicating between the intermediate chamber (12) and the drain opening (44), and the drain valve plate (402) is disposed in the communication chamber (410).
10. A low resistance backflow preventer according to claim 7, further comprising a valve cover (411), wherein the intermediate chamber (12) is provided with an upper opening, and the valve cover (411) is detachably and sealingly connected to the upper opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122119332.XU CN215522107U (en) | 2021-09-03 | 2021-09-03 | Low-resistance backflow preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122119332.XU CN215522107U (en) | 2021-09-03 | 2021-09-03 | Low-resistance backflow preventer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215522107U true CN215522107U (en) | 2022-01-14 |
Family
ID=79795547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122119332.XU Active CN215522107U (en) | 2021-09-03 | 2021-09-03 | Low-resistance backflow preventer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215522107U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114658878A (en) * | 2022-04-13 | 2022-06-24 | 中恒水务科技有限公司 | Non-resistance backflow preventer with double ball valves |
-
2021
- 2021-09-03 CN CN202122119332.XU patent/CN215522107U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114658878A (en) * | 2022-04-13 | 2022-06-24 | 中恒水务科技有限公司 | Non-resistance backflow preventer with double ball valves |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN215522107U (en) | Low-resistance backflow preventer | |
| CN115875508A (en) | On-line maintenance flow and pressure regulating valve bank | |
| CN201621338U (en) | Cascade voltage preventing reducing valve | |
| CN216344165U (en) | Pilot piston type air pressure reducing valve | |
| CN216895926U (en) | Low-resistance backflow preventer | |
| CN101672377A (en) | automatic compensation sealing plug valve | |
| CN2675971Y (en) | Membrane type double-chamber balanced rapid-open soil discharging electromagnetic valve | |
| WO2002033296A3 (en) | Pneumatically actuated membrane valve assembly | |
| KR100561207B1 (en) | Diaphragm-typed valves of differetial operation | |
| CN104763830A (en) | Piston type hydraulic control valve | |
| CN219493096U (en) | Novel slide plate type cut-off valve | |
| CN204592461U (en) | A kind of piston type hydraulic control valve | |
| CN210318618U (en) | Plug valve | |
| CN216479004U (en) | Ultrahigh pressure flat gate valve | |
| CN213809145U (en) | Piston direct-current water conservancy control valve capable of being maintained on line | |
| CN212775739U (en) | Integrated electromagnetic valve with filter | |
| CN219102124U (en) | Pressure relief valve group | |
| CN217977370U (en) | Novel temperature and pressure reducing regulating valve | |
| CN216478990U (en) | Butterfly valve with U-shaped metal valve seat and oval butterfly plate sealed | |
| CN219432528U (en) | Low-resistance backflow preventer with air partition function | |
| CN215831191U (en) | Novel special anti-leakage ball valve for natural gas | |
| CN211501762U (en) | Spring check valve | |
| CN219198220U (en) | Two-position three-way pilot valve | |
| CN220060685U (en) | Pilot-operated pressure reducing valve | |
| CN218094325U (en) | Parallel wedge type double-gate-plate knife gate valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A Low Resistance Backflow Preventer Effective date of registration: 20230724 Granted publication date: 20220114 Pledgee: China Resources Shenzhen International Investment Trust Co.,Ltd. Pledgor: TIANJIN GUOWEI FEEDING & DRAINAGE EQUIPMENT MENT MANUFACTURING Co.,Ltd. Registration number: Y2023110000304 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |