CN204961930U - Low resistance backflow preventer - Google Patents
Low resistance backflow preventer Download PDFInfo
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- CN204961930U CN204961930U CN201520562730.0U CN201520562730U CN204961930U CN 204961930 U CN204961930 U CN 204961930U CN 201520562730 U CN201520562730 U CN 201520562730U CN 204961930 U CN204961930 U CN 204961930U
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Abstract
The utility model discloses a low resistance backflow preventer belongs to the valve field. The utility model discloses a main valve with set up before the valve that link up respectively master control pipe behind master control pipe and the valve with the import of main valve and export, non return valve clack and back non return valve clack before being equipped with on the main valve, preceding non return valve clack passes through the valve rod with back non return valve clack and connects, set up seal structure between preceding non return valve clack and the back non return valve clack, seal structure includes inside seal core and external seal cover, inside seal core suit is in the valve rod middle section, the external seal cover is fixed in the lateral wall of main valve inner chamber, the valve rod passes the external seal cover, the hermetic unit that has mutual conflict between inside seal core and the external seal cover, the inside seal core is " C " type, set up the spring in the indent recess of inside seal core, before the valve behind master control pipe and the valve master control pipe connect through the wash -out valve, the wash -out valve top is link up through water -drain mast and main valve inner chamber, valve clack on the wash -out valve drives and opens through setting up before the valve master control was managed behind master control pipe and the valve diaphragm respectively.
Description
Technical field
The utility model belongs to valve field, especially relevant with a kind of low resistance force counter flow stop.
Background technique
Backflow preventer flows isolating valve also known as dirt, be a kind of strictly prevent Drinking Water pipeline occur backflow time polluted source safety installation, also can be applicable to the pipe-line system that other does not allow medium to flow backwards.Patent publication No. is that CN104329490A discloses a kind of low resistance force counter flow stop, there is the front valve gap, valve body, the rear valve base that are connected and have same center line, valve body is made up of cylindrical shell and waste pipe, and waste pipe is arranged on below cylindrical shell, the vertical and intersectant centerline of the two; Weep hole is provided with between waste pipe and cylindrical shell; Guiding valve is provided with in the inner chamber that the cylindrical shell of front valve gap and valve body is formed; In the inner chamber that the cylindrical shell of front valve gap, valve body, rear valve base are formed, order is provided with inlet check valve, drain valve and outlet non-return valve, and described inlet check valve, drain valve and outlet non-return valve have same center line; Described inlet check valve and outlet non-return valve adopt permanent magnet and armature structure; Cavity between guiding valve upstream extremity and front valve gap is water-inlet cavity, and the cavity between inlet check valve and outlet non-return valve is intermediate cavity, and the cavity in outlet non-return valve downstream is water chamber; Water-inlet cavity, intermediate cavity and water chamber are respectively equipped with aperture and are in communication with the outside.But the backflow preventer structure of this structure is complicated, cost is higher in the application, and for this problem, applicant has been researched and developed a kind of low resistance force counter flow stop and solved this problem.
Summary of the invention
For the problems referred to above, the purpose of this utility model aims to provide a kind of low resistance force counter flow stop.
For this reason, the utility model is by the following technical solutions: a kind of low resistance force counter flow stop, comprise main valve and be arranged at respectively with the import of main valve and master control pipe after master control pipe and valve before exporting through valve, described main valve is provided with front non-return flap and rear non-return flap, front non-return flap is connected by valve rod with rear non-return flap, the substantially horizontal that can be realized front non-return flap and rear non-return flap by valve rod is moved, between front non-return flap and rear non-return flap, sealing configuration is set, described sealing configuration comprises interior sealed core and outer seal sleeve, described interior sealed core is set in described valve rod stage casing, outer seal sleeve is fixed on the sidewall of described main valve inner chamber, described valve rod is through outer seal sleeve, between interior sealed core and outer seal sleeve, there is competing hermetic unit, described interior sealed core is in " C " type, in the indent groove of interior sealed core, spring is set, spring one end contacts at the bottom land of interior sealed core, the other end of spring contacts on outer seal sleeve, before described valve, master control pipe is connected by drain valve with master control pipe after valve, drain valve top by drain pipe and main valve inner chamber through, the flap on drain valve is driven by the diaphragm of master control pipe after master control pipe before being arranged at valve respectively and valve and opens.When the pressure of master control pipe after valve is more than or equal to the pressure of master control pipe before valve, backflow preventer valve becomes separate space by emptying for the water between the Double non-return valve of main valve, stops water to flow backwards in the duct.Backflow preventer valve is the valve affected by master control pipe pressure after master control pipe before valve and valve, by the pressure of master control pipe before the pressure of master control pipe after diaphragm Inductance valve and valve, when after valve, the pressure of master control pipe is more than or equal to the pressure of master control pipe before valve, diaphragm after valve on master control pipe is stressed to the diaphragm direction on master control pipe before valve, thus the flap opened on drain valve, realize the draining of drain valve.
As to technique scheme supplement and perfect, the utility model also comprises following technical characteristics.
Hermetic unit between described interior sealed core and outer seal sleeve arranges seal ring.
Described spring is volute spring, and one end that volute spring diameter is little is positioned at the bottom land of described sealed core.
Described outer seal sleeve is split type two-part compositions, and two-part are symmetrical each other also coordinates the receiving cavity forming the interior sealed core described in holding and described valve rod.
Described main valve inlet place is provided with stainless steel filter screen.
Described main valve is also provided with bleed valve, can reduction of blood pressure in high-speed when overhauling main valve by bleed valve, drain valve is sluiced fast.
Described low resistance force counter flow stop also comprises support ring and stem guiding ring, support ring and stem guiding ring are arranged at the front end of described valve rod, arrange radial support muscle between support ring and stem guiding ring, valve rod is connected with described front non-return flap through stem guiding ring.Thus support valve rod and flap further.
Described valve rod two end part are provided with positive stop lug boss.
Use the utility model can reach following beneficial effect: the utility model by medium by the basic principle of high-energy to low-yield transmission, backflow preventer utilizes medium to flow through and reduces pressure because of the milli machine resistance of setting and overcurrent loss of head into during water safety check, make inlet pressure higher than the pressure of sluicing valve pocket, this pressure reduction △ P controls drain valve and closes, and ensures normal water supply between import and outlet.Once be less than this safety value, medium is in the threshold state of refluence, and the flap at this moment on drain valve opens drain valve automatically by diaphragm, flows backwards in valve pocket outside water discharge pipe.
Drain valve adopts double flow channel structure, ensure that large quantity of air fills into valve pocket while sluicing, forms air partition, stopped medium refluence.Drain valve valve pocket internal pressure declines, and when △ P reaches setting safety value, drain valve cuts out automatically.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.
Embodiment: as shown in Figure 1, the utility model comprise main valve 1 and be arranged at respectively with the import of main valve 1 and master control pipe 9 after master control pipe 8 and valve before exporting through valve, main valve 1 is provided with front non-return flap 2 and rear non-return flap 3, front non-return flap 2 is connected by valve rod 7 with rear non-return flap 3, the substantially horizontal that can be realized front non-return flap 2 and rear non-return flap 3 by valve rod 7 is moved, between front non-return flap 2 and rear non-return flap 3, sealing configuration is set, sealing configuration comprises interior sealed core 4 and outer seal sleeve 5, interior sealed core 4 is set in valve rod 7 stage casing, outer seal sleeve 5 is fixed on the sidewall of main valve inner chamber, valve rod 7 is through outer seal sleeve 5, between interior sealed core 4 and outer seal sleeve 5, there is competing hermetic unit, interior sealed core 4 is in " C " type, in the indent groove of interior sealed core 4, spring 6 is set, spring 6 one end contacts at the bottom land of interior sealed core 4, the other end of spring 6 contacts on outer seal sleeve 5, before valve, master control pipe 8 is connected by drain valve 10 with master control pipe 9 after valve, drain valve 10 top by drain pipe and main valve 1 inner chamber through, the flap on drain valve 10 is driven by the diaphragm 11 of master control pipe 9 after master control pipe 8 before being arranged at valve respectively and valve and opens.When the pressure of master control pipe 9 after valve is more than or equal to the pressure of master control pipe 8 before valve, backflow preventer valve becomes separate space by emptying for the water between the Double non-return valve of main valve 1, stops water to flow backwards in the duct.Backflow preventer valve is the valve by master control pipe 9 pressure influence after master control pipe 8 before valve and valve, by the pressure of master control pipe 8 before the pressure of master control pipe 9 after diaphragm 11 Inductance valve and valve, when after valve, the pressure of master control pipe 9 is more than or equal to the pressure of master control pipe 8 before valve, diaphragm after valve on master control pipe 9 is stressed to the diaphragm direction on master control pipe 8 before valve, thus the flap opened on drain valve 10, realize the draining of drain valve.
Further, the hermetic unit between interior sealed core 4 and outer seal sleeve 5 arranges seal ring.
Further, spring 6 is volute spring, and one end that volute spring diameter is little is positioned at the bottom land of sealed core 4.
Further, outer seal sleeve 5 is split type two-part compositions, the receiving cavity of sealed core 4 and valve rod 7 in two-part symmetrical also cooperation is each other formed and holds.
Further, main valve inlet place is provided with stainless steel filter screen.
Further, main valve 1 is also provided with bleed valve, can reduction of blood pressure in high-speed when overhauling main valve by bleed valve, drain valve is sluiced fast.
Further, low resistance force counter flow stop also comprises support ring and stem guiding ring, support ring and stem guiding ring are arranged at the front end of valve rod 7, arrange radial support muscle between support ring and stem guiding ring, and valve rod 7 is connected with front non-return flap 2 through stem guiding ring.Thus support valve rod 7 and flap further.
Preferably, valve rod 7 two end part are provided with positive stop lug boss.
Drain valve two ends adopt super large two diaphragm induction control room structure, improve drain valve active force, ensure the Security of backflow preventer.Consider if after the damage of diaphragm rubber parts simultaneously, ensure that leaking medium all by outside the expulsion valve of air partition upper and lower chamber, can guarantee that refluence phenomenon can not occur to control upper and lower chamber.
Further, backflow preventer is in installation, using process, and the control valve Louis of exposing is stolen and break, and impact normally uses.The utility model adopts built-in security control piping system, avoids the generation of above-mentioned situation, guarantees the safe handling of low resistance force counter flow stop.
The utility model by medium by the basic principle of high-energy to low-yield transmission, backflow preventer utilizes medium to flow through and reduces pressure because of the milli machine resistance of setting and overcurrent loss of head into during water safety check, make inlet pressure higher than the pressure of sluicing valve pocket, this pressure reduction △ P controls drain valve and closes, and ensures normal water supply between import and outlet.Safety value △ P is decided to be 0.005MPa, once be less than this safety value, medium is in the threshold state of refluence, and at this moment the spring of drain valve opens drain valve automatically, flows backwards in valve pocket outside water discharge pipe.Drain valve adopts double flow channel structure, ensure that large quantity of air fills into valve pocket while sluicing, forms air partition, stopped medium refluence, and effectively prevented siphon from flowing backwards.At this moment drain valve valve pocket internal pressure declines, and when △ P reaches setting safety value, drain valve cuts out automatically.
More than show and describe basic principle of the present utility model and major character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (8)
1. a low resistance force counter flow stop, comprise main valve (1) and be arranged at respectively with the import of main valve (1) and master control pipe (9) after master control pipe (8) and valve before exporting through valve, it is characterized in that: described main valve (1) is provided with front non-return flap (2) and rear non-return flap (3), front non-return flap (2) is connected by valve rod (7) with rear non-return flap (3), between front non-return flap (2) and rear non-return flap (3), sealing configuration is set, described sealing configuration comprises interior sealed core (4) and outer seal sleeve (5), described interior sealed core (4) is set in described valve rod (7) stage casing, outer seal sleeve (5) is fixed on the sidewall of described main valve inner chamber, described valve rod (7) is through outer seal sleeve (5), between interior sealed core (4) and outer seal sleeve (5), there is competing hermetic unit, described interior sealed core (4) is in " C " type, spring (6) is set in the indent groove of interior sealed core (4), spring (6) one end contacts at the bottom land of interior sealed core (4), the other end of spring (6) contacts on outer seal sleeve (5), before described valve, master control pipe (8) is connected by drain valve (10) with master control pipe (9) after valve, drain valve (10) top by drain pipe and main valve (1) inner chamber through, the flap on drain valve (10) by arrange respectively at master control pipe (9) after master control pipe (8) before valve and valve diaphragm (11) drive unlatching.
2. a kind of low resistance force counter flow stop according to claim 1, is characterized in that: the hermetic unit between described interior sealed core (4) and outer seal sleeve (5) arranges seal ring.
3. a kind of low resistance force counter flow stop according to claim 2, is characterized in that: described spring (6) is volute spring, and one end that volute spring diameter is little is positioned at the bottom land of described sealed core (4).
4. a kind of low resistance force counter flow stop according to claim 1, it is characterized in that: described outer seal sleeve (5) forms for split type two-part, two-part are symmetrical each other and coordinate the receiving cavity forming the interior sealed core (4) described in holding and described valve rod (7).
5. a kind of low resistance force counter flow stop according to claim 4, is characterized in that: described main valve inlet place is provided with stainless steel filter screen.
6. a kind of low resistance force counter flow stop according to claim 5, is characterized in that: described main valve (1) is also provided with bleed valve.
7. a kind of low resistance force counter flow stop according to claim 6, it is characterized in that: described low resistance force counter flow stop also comprises support ring and stem guiding ring, support ring and stem guiding ring are arranged at the front end of described valve rod (7), radial support muscle is set between support ring and stem guiding ring, valve rod (7) through stem guiding ring with described before non-return flap (2) be connected.
8. a kind of low resistance force counter flow stop according to claim 7, is characterized in that: described valve rod (7) two end part are provided with positive stop lug boss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520562730.0U CN204961930U (en) | 2015-07-30 | 2015-07-30 | Low resistance backflow preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520562730.0U CN204961930U (en) | 2015-07-30 | 2015-07-30 | Low resistance backflow preventer |
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| Publication Number | Publication Date |
|---|---|
| CN204961930U true CN204961930U (en) | 2016-01-13 |
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| CN201520562730.0U Active CN204961930U (en) | 2015-07-30 | 2015-07-30 | Low resistance backflow preventer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106838383A (en) * | 2017-01-19 | 2017-06-13 | 陈银周 | The reverse pressure release type of one master-slave type is noiseless check-valves |
| CN110878856A (en) * | 2019-12-20 | 2020-03-13 | 福建泉牌阀门科技股份有限公司 | Backflow preventer device capable of adjusting seat-back positive pressure difference and flow resistance and working method thereof |
| CN117570230A (en) * | 2024-01-19 | 2024-02-20 | 四川中油乐仪能源装备制造股份有限公司 | Axial flow type check valve |
-
2015
- 2015-07-30 CN CN201520562730.0U patent/CN204961930U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106838383A (en) * | 2017-01-19 | 2017-06-13 | 陈银周 | The reverse pressure release type of one master-slave type is noiseless check-valves |
| CN110878856A (en) * | 2019-12-20 | 2020-03-13 | 福建泉牌阀门科技股份有限公司 | Backflow preventer device capable of adjusting seat-back positive pressure difference and flow resistance and working method thereof |
| CN117570230A (en) * | 2024-01-19 | 2024-02-20 | 四川中油乐仪能源装备制造股份有限公司 | Axial flow type check valve |
| CN117570230B (en) * | 2024-01-19 | 2024-03-19 | 四川中油乐仪能源装备制造股份有限公司 | Axial flow type check valve |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CP03 | Change of name, title or address |
Address after: 201600 No. 475-2, Yeda highway, Yexie Town, Songjiang District, Shanghai Patentee after: Shanghai Jisen Machinery Technology (Group) Co.,Ltd. Address before: 201608 Building 2, No. 90, yezhang Road, Yexie Town, Songjiang District, Shanghai Patentee before: SHANGHAI GIESSEN MACHINERY MANUFACTURING Co.,Ltd. |