CN101839358B - Gravity type backflow preventer - Google Patents
Gravity type backflow preventer Download PDFInfo
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- CN101839358B CN101839358B CN201010159695XA CN201010159695A CN101839358B CN 101839358 B CN101839358 B CN 101839358B CN 201010159695X A CN201010159695X A CN 201010159695XA CN 201010159695 A CN201010159695 A CN 201010159695A CN 101839358 B CN101839358 B CN 101839358B
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Abstract
The invention discloses a gravity type backflow preventer, which is applied to a place where pressure water in a pipeline is strictly limited to flow in one way. The gravity type backflow preventer mainly comprises a main valve (1), a pressure difference water escape valve (2) and a gravity water escape valve (3), wherein the main valve (1) mainly comprises valve bodies (1-1 and 1-2), a positioning board (1-3), a sliding sleeve (1-6) and lifting type check valve plates (1-7 and 1-8); the pressure difference water escape valve (2) mainly comprises a valve body (2-1), a valve cover (2-2), a weight (2-3), a flexible membrane (2-4) and a lifting type valve plate (2-6); and the gravity water escape valve (3) mainly comprises a valve body (3-1), a valve cover (3-2), a weight (3-3), a flexible membrane (3-4) and a lifting type valve plate (3-6). Compared with the prior art, the gravity type backflow preventer has the outstanding advantages that: water flow resistance is extremely low; and the total loss of head is reduced from over 0.05MPa to below 0.005MPa.
Description
Technical field
The present invention relates to a kind of backflow preventer, specifically is a kind of strict gravity type backflow preventer that limits the place that ducted press water can only one-way flow that is used for.
Background technique
The municipal water supply pipe network extensively adopts backflow preventer, enters once more in the pipe network to prevent the refluence water that the user produces in water utilizing process, avoids contamination accident, guarantees the safe and sanitary that supplies water.According to code requirement, the split point of city planting ductwork and user's access place, different system and different water water quality, partition measures such as backflow preventer all should be installed, but use backflow preventer to cause the following problem that can not be ignored: the loss of head of backflow preventer is generally more than 0.05MPa, even reaching 0.1MPa, China's present municipal water supply pipe network year water output is not less than 50,000,000,000 m
3, if all flow through backflow preventer, by loss of head 0.05MPa, every m
3Water needs the experience of power consumption 25W to calculate, and then electric energy consumed every year amounts to more than 12.5 hundred million kw.h, causes huge waste, has obviously increased the operating cost of water undertaking.
At present both at home and abroad the high shortcoming of the big energy consumption of backflow preventer resistance is due to its structural imperfection, its gross head loss comprises the elastic resistance of water turbulence loss and resilient member, both be difficult for by flow passage components are carried out the profile correction of the flank shape in the hope of reducing turbulent loss, also can't eliminate even reduce elastic resistance, be difficult on existing basis, carry out technological improvement.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of gravity type backflow preventer.
The technological scheme that the present invention solves the problems of the technologies described above is:
A kind of gravity type backflow preventer, it is characterized in that, form by main valve 1, pressure reduction drain valve 2, gravity drain valve 3, positive pressure tube 4 and back pressure pipe 5, the valve body 1-1 of main valve 1 is communicated with the intake chamber 2-12 of pressure reduction drain valve 2 and the intake chamber 3-7 of gravity drain valve 3 respectively, and positive pressure tube 4 is connected to the malleation hole 2-8 of pressure reduction drain valve 2 from the malleation hole 1-12 of the valve body 1-1 of main valve 1; Back pressure pipe 5 is connected to the back pressure hole 2-11 of pressure reduction drain valve 2 from the back pressure hole 1-13 of the valve body 1-1 of main valve 1);
Above-mentioned main valve 1 is made up of valve body 1-1 and 1-2, positioning plate 1-3, abutment sleeve 1-4 and 1-5, sliding sleeve 1-6, Lift check valve plate 1-7 and 1-8, and positioning plate 1-3 is ring-type, closely is fixed on the joint of valve body 1-1 and valve body 1-2; Valve body 1-1 is a reducing cross, and valve body 1-2 is a straight-through tube, the water intake 1-16 of valve body 1-1, the water outlet 1-18 of valve body 1-2; Abutment sleeve 1-4 is straight barrel shape, the lower end closed upper end open, and lower end and positioning plate 1-3 are connected as a single entity; Abutment sleeve 1-5 is straight barrel shape, the upper end closed lower ending opening, the upper end is connected as a single entity with positioning plate 1-3, interior middle part, upper end has hole 1-14 and periphery is provided with the sealing surface relative with sliding sleeve 1-6, barrel top has hole 1-15, and hole 1-14 is communicated with atmosphere, and hole 1-15 is communicated with valve pocket 1-17, the position of hole 1-14 is higher than hole 1-15, and the position of hole 1-15 is lower than sealing surface; Sliding sleeve 1-6 is straight barrel shape, and the lower ending opening upper end closed inserts in the abutment sleeve 1-5, and opening end is downward, and last end periphery is provided with and the interior relative sealing surface in abutment sleeve 1-5 upper end; Lift check valve plate 1-7 is inverse-T-shaped, and vertically body is a slide bar up, and slide bar inserts in the sliding sleeve 1-6; Lift check valve plate 1-8 is "T"-shaped, and vertically body is a slide bar down, and slide bar inserts in the abutment sleeve 1-4; Valve body 1-1 is provided with the seal holder ring 1-9 relative with Lift check valve plate 1-7, and valve body 1-2 is provided with the seal holder ring 1-10 relative with Lift check valve plate 1-8; Malleation hole 1-12 is arranged between the water intake 1-16 of valve body 1-1 and the seal holder ring 1-9, between seal holder ring 1-9 and the seal holder ring 1-10 back pressure hole 1-13 is arranged, malleation hole 1-12 is communicated with positive pressure tube 4, and back pressure hole 1-13 is communicated with back pressure pipe 5; Have the penetrating hole 1-11 of upper and lower surface on the positioning plate 1-3, form valve pocket 1-17 between Lift check valve plate 1-7 and the 1-8;
Above-mentioned pressure reduction drain valve 2 is made up of valve body 2-1, valve gap 2-2, counterweight 2-3, soft barrier film 2-4, bolt 2-5, rise-fall type valve plate 2-6 and seal ring 2-7, by order valve body 2-1, soft barrier film 2-4 and valve gap 2-2 three are closely fixing from top to bottom, be provided with upper and lower dividing plate in the valve body 2-1, form intake chamber 2-12 between the upper and lower dividing plate, it is communicated with the valve pocket 1-17 of main valve 1, having spilled water hole 2-13 on the lower clapboard communicates with drain opening 2-14, have positioning hole on the upper clapboard and have groove, the built-in O-ring seal 2-7 of groove at the hole periphery; Counterweight 2-3 is a cylindricality, and it extend in the intake chamber 2-12 from the positioning hole of upper clapboard, and its upper end is closely fixing with bolt 2-5 and soft barrier film 2-4; Rise-fall type valve plate 2-6 is inverse-T-shaped, and vertically body is a connecting rod, and it is connected with the lower end of counterweight 2-3; Form malleation chamber 2-9 between upper clapboard and the soft barrier film 2-4, form back pressure cavity 2-10 between soft barrier film 2-4 and the valve gap 2-2; Above the upper clapboard of valve body 2-1, have malleation hole 2-8 and be communicated with, have back pressure hole 2-11 on the valve gap 2-2 and be communicated with back pressure pipe 5 with positive pressure tube 4;
Above-mentioned gravity drain valve 3 is made up of valve body 3-1, valve gap 3-2, counterweight 3-3, soft barrier film 3-4, bolt 3-5 and rise-fall type valve plate 3-6, by order valve body 3-1, soft barrier film 3-4, valve gap 3-2 three are closely fixing from top to bottom, be provided with one dividing plate in the valve body 3-1, form intake chamber 3-7 between dividing plate and the soft barrier film 3-4, have spilled water hole 3-10 on the dividing plate and communicate with drain opening 3-11; Counterweight 3-3 is a cylindricality, and the upper end is closely fixing with bolt 3-5 and soft barrier film 3-4; Rise-fall type valve plate 3-6 is inverse-T-shaped, and vertically body is a connecting rod, and it is connected with the lower end of counterweight 3-3; Form back pressure cavity 3-8 between soft barrier film 3-4 and the valve gap 3-2, have vent 3-9 on the valve gap 3-2 and communicate with atmosphere.
The present invention's characteristics compared with the prior art are:
1. the employing non-spring structure has been eliminated same category of device and has been adopted spring component to cause the big drawback of resistance, greatly reduces loss of head on structure;
2. utilize the interaction of gravity, hydraulic pressure and atmospheric pressure to realize switching motion, the dynamic resistance to water-flow of avoiding the movable part own wt to bring simultaneously;
3. runner is smooth and easy, and the water turbulence loss is less.
More than comprehensive, the present invention can greatly reduce resistance to water-flow, is reduced to 0.005MPa more than the 0.05MPa of gross head loss by same category of device even below the 0.003MPa.
Accompanying drawing is described
Figure the-1st, assembling schematic representation of the present invention.
Structural representation when figure the-2nd, circulation status of the present invention.
Figure the-3rd, structural representation during pressure reduction drain valve opening state of the present invention.
Figure the-4th, structural representation during gravity drain valve opening state of the present invention.
Among the figure-1: main valve 1, pressure reduction drain valve 2, gravity drain valve 3, positive pressure tube 4, back pressure pipe 5.
Among figure-2～figure-4: valve body 1-1,1-2, positioning plate 1-3, abutment sleeve 1-4,1-5, sliding sleeve 1-6, Lift check valve plate 1-7,1-8, seal holder ring 1-9,1-10, hole 1-11, malleation hole 1-12, back pressure hole 1-13, hole 1-14,1-15, water intake 1-16, valve pocket 1-17, water outlet 1-18; Valve body 2-1, valve gap 2-2, counterweight 2-3, soft barrier film 2-4, bolt 2-5, rise-fall type valve plate 2-6, seal ring 2-7, malleation hole 2-8, malleation chamber 2-9, back pressure cavity 2-10, back pressure hole 2-11, intake chamber 2-12, discharge opening 2-13, drain opening 2-14; Valve body 3-1, valve gap 3-2, counterweight 3-3, soft barrier film 3-4, bolt 3-5, rise-fall type valve plate 3-6, intake chamber 3-7, back pressure cavity 3-8, vent 3-9, spilled water hole 3-10, drain opening 3-11; Positive pressure tube 4, back pressure pipe 5.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described.
One, workflow
Workflow of the present invention is divided into the circulation operating mode, pressure reduction drain valve 2 is opened four kinds of operating modes such as operating mode, gravity drain valve 3 unlatching operating modes and the operating mode that resets, and division is as follows:
1. circulation operating mode
As shown in Figure 2: when coming water hydraulic pressure to be higher than setting value, water pressure is greater than the gravity sum of Lift check valve plate 1-7 and sliding sleeve 1-6, water is upwards pushed open Lift check valve plate 1-7 and sliding sleeve 1-6, enter valve pocket 1-17 from water intake 1-16, upwards push Lift check valve plate 1-8 again open and flow out from water outlet 1-18.Under circulation status, there is differential water pressures between water intake 1-16 and the valve pocket 1-17, the hydraulic pressure of water intake 1-16 is higher to be malleation, in the valve pocket 1-17 hydraulic pressure lowly be back pressure, malleation and back pressure enter the malleation chamber 2-9 and the back pressure cavity 2-10 of pressure reduction drain valve 2 respectively by positive pressure tube 4 and back pressure pipe 5, act on the soft barrier film 2-4, back pressure also acts on counterweight 2-3 and the rise-fall type valve plate 2-6 simultaneously by intake chamber 2-12, malleation, the related counterweight 2-3 of soft barrier film 2-4 that makes a concerted effort to promote that back pressure and gravity interact and produces, bolt 2-5 and rise-fall type valve plate 2-6 rise together, till rise-fall type valve plate 2-6 closed discharge opening 2-13, water can not release from discharge opening 2-13; Back pressure acts on soft barrier film 3-4, counterweight 3-3 and the rise-fall type valve plate 3-6 by the intake chamber 3-7 of gravity drain valve 3, barometric pressure enters back pressure cavity 3-8 by vent 3-9 and acts on the soft barrier film 3-4, back pressure, barometric pressure and gravity interact, and making a concerted effort of producing promotes the related counterweight 3-3 of soft barrier film 3-4, bolt 3-5 and rise-fall type valve plate 3-6 rises together, till rise-fall type valve plate 3-6 closed discharge opening 3-10, water can not release from discharge opening 3-10; The sliding sleeve 1-6 rising of making a concerted effort to promote that back pressure, barometric pressure and gravity interact and produces, until with abutment sleeve 1-5 in upper end sealing surface closing seam, water can not flow out from hole 1-14 and enter atmosphere, and the own wt of sliding sleeve 1-6 can not produce the dynamic head loss.
2. pressure reduction drain valve 2 is opened operating mode
As shown in Figure 3: water outlet 1-18 does not go out stream, and Lift check valve plate 1-7,1-8 fall after rise by deadweight and close, and water can not flow backwards, and the pressure reduction between water intake 1-16 and the valve pocket 1-17 is constant, and rise-fall type valve plate 2-6 and discharge opening 2-13 remain on closed condition.Make hydraulic pressure rising in the valve pocket 1-17 when seepage takes place for Lift check valve plate 1-7,1-8, or come water hydraulic pressure to reduce, cause the pressure reduction between water intake 1-16 and the valve pocket 1-17 to reduce, when pressure reduction during less than setting value, malleation, back pressure and gravity interact, and making a concerted effort of producing promotes the related counterweight 2-3 of soft barrier film 2-4, bolt 2-5 and rise-fall type valve plate 2-6 falls after rise together, the discharge opening 2-13 sluicing that is opened.Water is discharged once drain opening 2-14, and the pressure reduction between water intake 1-16 and the valve pocket 1-17 increases thereupon, when greater than setting value, rise-fall type valve plate 2-6 promptly rises again and closes discharge opening 2-13, the do action that so goes round and begins again is kept pressure reduction and is not less than setting value, guarantees that water can not flow backwards.
3. gravity drain valve 3 is opened operating mode
As shown in Figure 4: when coming water hydraulic pressure to be lower than setting value, back pressure, barometric pressure and gravity interact and promote produce with joint efforts sliding sleeve 1-6 and fall after rise with seal holder ring 1-9 with Lift check valve plate 1-7 and close, Lift check valve plate 1-8 then falls after rise with seal holder ring 1-10 by deadweight and closes, simultaneously the related counterweight 3-3 of soft barrier film 3-4, bolt 3-5 and rise-fall type valve plate 3-6 fall after rise, the spilled water hole 3-10 sluicing that is opened; Spilled water hole 3-10 sluices simultaneously, and atmosphere enters in the abutment sleeve 1-5 from hole 1-14, enters valve pocket 1-17 through hole 1-15 again, forms air and cuts off, and anti-sealing generation siphon is flow backwards.
4. operating mode resets
As shown in Figure 2: come water hydraulic pressure to rise again when being higher than setting value, according to above-mentioned, Lift check valve plate 1-7,1-8 are opened in succession, recover the circulation operating mode.
Two, type selection calculation
Type selection calculation of the present invention mainly is to determine to come the pressure differential resetting value of water hydraulic pressure setting value, malleation and back pressure, determine Lift check valve plate 1-7,1-8 and sliding sleeve 1-6, the counterweight 3-3 of gravity drain valve 3 and the weight and the specification of soft barrier film 3-4 of main valve 1 according to the hydraulic pressure setting value, determine the counterweight 2-3 of pressure reduction drain valve 2 and weight and the specification of soft barrier film 2-4 according to the pressure differential resetting value.
1. hydraulic pressure setting value
Come water hydraulic pressure setting value to determine, have following relation with Lift check valve plate 1-7 and sliding sleeve 1-6 according to relevant criterion or code requirement
P
0·S
j＝W
f+W
t (1)
In the formula: P
0-hydraulic pressure setting value, water column, m
S
j-water intake 1-16 is cross-sectional area radially, cm
2
W
fThe weight of-Lift check valve plate 1-7, kg
W
tThe weight of-sliding sleeve 1-6, kg
There are following relation in the weight of Lift check valve plate 1-7 and pressure differential resetting value
W
f＝ΔP·S
j (2)
In the formula: Δ P-pressure differential resetting value, water column, m
Wushu (2) substitution formula (1),
W
t＝S
j(P
0-ΔP) (3)
The weight of Lift check valve plate 1-8 is not more than the weight of Lift check valve plate 1-7,0.5～1.0 times of the desirable latter.
2. pressure differential resetting value
P is littler for pressure differential resetting value Δ, and loss of head is just little, but the specification of soft relatively barrier film 2-4 is also just big, takes all factors into consideration Δ P and should be located at about 0.1m water column (0.001MPa).
3. counterweight 2-3 and soft barrier film 2-4
When malleation, back pressure and gravity interact on counterweight 2-3 and soft barrier film 2-4 and reach state of equilibrium, P
b=(P
0-Δ P), there is following relation
P
0·S
z+P
b·S
p1＝P
b·S
k1+P
b·S
b1+W
p1 (4)
In the formula: P
b-back pressure, water column, m
S
zThe surface of contact of-soft barrier film 2-4 and malleation is at the area of contour of vertical, cm
2
S
P1The area of-counterweight 2-3 the lower end surface that contacts with back pressure, cm
2
S
K1The runoff area of-spilled water hole 2-13, cm
2
S
B1The surface of contact of-soft barrier film 2-4 (comprising bolt 2-5) and back pressure is in the throwing of vertical
The shadow area, cm
2
W
P1The weight of-counterweight 2-3 (containing bolt 2-5 and rise-fall type valve plate 2-6), kg
Under state of equilibrium, P
b=(P
0-Δ P), substitution formula (4),
W
p1＝P
0·S
z+(P
0-ΔP)(S
p1-S
k1-S
b1) (5)
When getting S
P1=S
K1The time, then have
W
p1＝ΔP·S
b1-P
0·S
p1 (6)
Press the water intake 1-16 of different size, roughly determine the weight W of counterweight 2-3 earlier
P1, try to achieve its cross-sectional area S in view of the above
P1, substitution formula again (6) is tried to achieve the area S of soft barrier film 2-4
B1
3. counterweight 3-3 and soft barrier film 3-4
When back pressure, barometric pressure and gravity interact on counterweight 3-3 and soft barrier film 3-4 and reaches state of equilibrium, there is following relation
W
p2＝(P
0-ΔP)(S
b2-S
k2) (7)
In the formula: W
P2The weight of-counterweight 3-3 (containing bolt 3-5 and rise-fall type valve plate 3-6), kg
S
B2The surface of contact of-soft barrier film 3-4 (comprising counterweight 3-3) and back pressure is at the area of contour of vertical, cm
2
S
K2The runoff area of-discharge opening 3-10, cm
2, be not less than water intake 1-16 radially cross-sectional area 25%.
Press the water intake 1-16 of different size, roughly determine the weight W of counterweight 3-3 earlier
P2, substitution formula again (7) is tried to achieve the area S of soft barrier film 3-4
B2
Know that from formula (2) under circulation status, if disregard turbulent drag, loss of head is 0.0015～0.002MPa (0.15～0.2m water column); By being carried out the profile correction of the flank shape, the overcurrent member can effectively reduce resistance coefficient, determine suitable overcurrent flow velocity (being no more than 1.2m/s) simultaneously, when the flow velocity of water intake 1-16 is no more than economic velocity, be to be controlled at turbulent drag in the 0.002MPa (0.2m water column) fully, and then the gross head damage control in 0.005MPa (0.5m water column), not up till now 1/10th of backflow preventer.
Claims (1)
1. gravity type backflow preventer, it is characterized in that, form by main valve (1), pressure reduction drain valve (2), gravity drain valve (3), positive pressure tube (4) and back pressure pipe (5), the valve body one (1-1) of main valve (1) is communicated with the intake chamber (2-12) of pressure reduction drain valve (2) and the intake chamber (3-7) of gravity drain valve (3) respectively, and positive pressure tube (4) is connected to the malleation hole (2-8) of pressure reduction drain valve (2) from the malleation hole (1-12) of the valve body one (1-1) of main valve (1); Back pressure pipe (5) is connected to the back pressure hole (2-11) of pressure reduction drain valve (2) from the back pressure hole (1-13) of the valve body one (1-1) of main valve (1);
Described main valve (1) is made up of valve body one (1-1) and valve body two (1-2), positioning plate (1-3), abutment sleeve one (1-4) and abutment sleeve two (1-5), sliding sleeve (1-6), Lift check valve plate one (1-7) and Lift check valve plate two (1-8), and positioning plate (1-3) is ring-type, closely is fixed on the joint of valve body one (1-1) and valve body two (1-2); Valve body one (1-1) is a reducing cross, and valve body two (1-2) is a straight-through tube, and valve body one (1-1) has water intake (1-16), and valve body two (1-2) has water outlet (1-18); Abutment sleeve one (1-4) is straight barrel shape, the lower end closed upper end open, and lower end and positioning plate (1-3) are connected as a single entity; Abutment sleeve two (1-5) is straight barrel shape, the upper end closed lower ending opening, the upper end is connected as a single entity with positioning plate (1-3), interior middle part, upper end has hole one (1-14) and periphery is provided with and the relative sealing surface of sliding sleeve (1-6), the barrel top of abutment sleeve two (1-5) has hole two (1-15), and hole one (1-14) is communicated with atmosphere, and hole two (1-15) is communicated with valve pocket (1-17), the position in hole one (1-14) is higher than hole two (1-15), and the position of hole two (1-15) is lower than sealing surface; Sliding sleeve (1-6) is straight barrel shape, and the lower ending opening upper end closed inserts in the abutment sleeve two (1-5), and opening end is downward, and last end periphery is provided with and the interior relative sealing surface in abutment sleeve two (1-5) upper end; Lift check valve plate one (1-7) is inverse-T-shaped, and vertically body is a slide bar up, and slide bar inserts in the sliding sleeve (1-6); Lift check valve plate two (1-8) is "T"-shaped, and vertically body is a slide bar down, and slide bar inserts in the abutment sleeve one (1-4); Valve body one (1-1) is provided with the seal holder ring one (1-9) relative with Lift check valve plate one (1-7), and valve body two (1-2) is provided with the seal holder ring two (1-10) relative with Lift check valve plate two (1-8); Between the water intake (1-16) of valve body one (1-1) and the seal holder ring one (1-9) malleation hole (1-12) is arranged, between seal holder ring one (1-9) and the seal holder ring two (1-10) back pressure hole (1-13) is arranged, malleation hole (1-12) is communicated with positive pressure tube (4), and back pressure hole (1-13) is communicated with back pressure pipe (5); Have the penetrating hole of upper and lower surface (1-11) on the positioning plate (1-3), form valve pocket (1-17) between Lift check valve plate one (1-7) and the Lift check valve plate two (1-8);
Described pressure reduction drain valve (2) is by valve body (2-1), valve gap (2-2), counterweight (2-3), soft barrier film (2-4), bolt (2-5), rise-fall type valve plate (2-6) and seal ring (2-7) are formed, press order valve body (2-1) from top to bottom, soft barrier film (2-4) and valve gap (2-2) three are closely fixing, be provided with in the valve body (2-1), lower clapboard, on, form intake chamber (2-12) between the lower clapboard, it is communicated with the valve pocket (1-17) of main valve (1), having spilled water hole (2-13) on the lower clapboard communicates with the drain opening (2-14) of pressure reduction drain valve (2), have positioning hole on the upper clapboard and have groove, the built-in O-ring seal of groove (2-7) at the hole periphery; Counterweight (2-3) is a cylinder, and it extend in the intake chamber (2-12) from the positioning hole of upper clapboard, and its upper end is closely fixing with bolt (2-5) and soft barrier film (2-4); Rise-fall type valve plate (2-6) is inverse-T-shaped, and vertically body is a connecting rod, and it is connected with the lower end of counterweight (2-3); Form malleation chamber (2-9) between upper clapboard and the soft barrier film (2-4), form back pressure cavity (2-10) between soft barrier film (2-4) and the valve gap (2-2); Have malleation hole (2-8) in the upper clapboard top of valve body (2-1) and be communicated with, have back pressure hole (2-11) on the valve gap (2-2) and be communicated with back pressure pipe (5) with positive pressure tube (4);
Described gravity drain valve (3) is made up of valve body (3-1), valve gap (3-2), counterweight (3-3), soft barrier film (3-4), bolt (3-5) and rise-fall type valve plate (3-6), by order valve body (3-1), soft barrier film (3-4), valve gap (3-2) three are closely fixing from top to bottom, be provided with dividing plate one in the valve body (3-1), form intake chamber (3-7) between dividing plate and the soft barrier film (3-4), have spilled water hole (3-10) on the dividing plate and communicate with the drain opening (3-11) of gravity drain valve (3); Counterweight (3-3) is a cylindricality, and the upper end is closely fixing with bolt (3-5) and soft barrier film (3-4); Rise-fall type valve plate (3-6) is inverse-T-shaped, and vertically body is a connecting rod, and it is connected with the lower end of counterweight (3-3); Form back pressure cavity (3-8) between soft barrier film (3-4) and the valve gap (3-2), have vent (3-9) on the valve gap (3-2) and communicate with atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010159695XA CN101839358B (en) | 2010-04-29 | 2010-04-29 | Gravity type backflow preventer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010159695XA CN101839358B (en) | 2010-04-29 | 2010-04-29 | Gravity type backflow preventer |
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| Publication Number | Publication Date |
|---|---|
| CN101839358A CN101839358A (en) | 2010-09-22 |
| CN101839358B true CN101839358B (en) | 2011-09-14 |
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|---|---|---|---|
| CN201010159695XA Active CN101839358B (en) | 2010-04-29 | 2010-04-29 | Gravity type backflow preventer |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103821969A (en) * | 2014-01-28 | 2014-05-28 | 何际跃 | Follow-up backflow preventer |
| CN104874282B (en) * | 2015-05-12 | 2017-12-12 | 江苏揽山环境科技股份有限公司 | A kind of flue gas desulphurization system |
| CN110307361A (en) * | 2019-08-05 | 2019-10-08 | 浙江卡博铜业有限公司 | A kind of vacuum breaker |
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| JPH1151222A (en) * | 1997-08-07 | 1999-02-26 | Hikari Gokin Seisakusho:Kk | Double check type drain valve fitted with relief valve |
| JP3893322B2 (en) * | 2002-05-24 | 2007-03-14 | 日機装株式会社 | Reciprocating pump |
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| CN2442057Y (en) * | 2000-09-05 | 2001-08-08 | 南海市九江永兴阀门制造有限公司 | Counter flow stop device |
| CN2849376Y (en) * | 2005-11-24 | 2006-12-20 | 李习洪 | Low water loss counter-flow prevention device |
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| JP特开2003-343427A 2003.12.03 |
| JP特开平11-51222A 1999.02.26 |
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| CN101839358A (en) | 2010-09-22 |
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