- ball
- Gate valve
- butterfly valve
- Regulating valve
- Cut-off valve
- Globe valve
- Check valve
- Knife Gate Valve
- Safety valve
- Pressure relief valve
- Drain valve
- Plug valve
- Diaphragm valve
- Discharge valve
- Exhaust valve
- Filter
- Solenoid valve
- Needle valve
- Plunger valve
- Copper valve
- Compensator
- Hydraulic control valve
- Electric two way valve
- Vacuum valve
- Thermal insulation valve
- Flame arrester
- Breathing valve
- Balance valve
- Sludge discharge valve
- Ammonia valve
- Metallurgical valves
- Fluorine valve
- Low temperature valve
- Power station valve
- Natural gas valves
- Other valves
- Inlet valve
- Import actuator
Low resistance reverse flow preventer
- sell：021-32051999
- sell：021-32050777
- fax：021-66099555
Details
- Product Introduction
- Service Promise
- Ordering Process
The low resistance reverse flow preventer consists of two front and back check valves and an intermediate automatic drainer. When the reflux condition occurs, the two check valves close automatically, the drain opens automatically, and the middle chamber is separated from the atmosphere. When the front and rear check valves are leaking, they can automatically drain water, block the backflow, strictly prevent backflow pollution, and protect the water quality in the upstream pipeline.
Functional characteristics
The main valve is composed of two check valves and an intermediate automatic drainer.
(2) When the front and rear check valves leak, they can automatically drain water, block the backflow, strictly prevent backflow pollution, and protect the water quality in the upstream pipeline.
(3) super low water loss and significant energy saving: head loss is less than 0.03Mpa;
Air partition and automatic drainage: when the main valve closes, the drainer opens automatically and the pressure of the middle chamber is zero. Air partition or zero pressure partition can be realized between the upstream and downstream of the main valve to effectively prevent backflow pollution.
_Save material, flexible installation: small shape, light weight, structure length is only 30% of the existing similar products; can be installed horizontally or vertically.
Comply with hygiene and safety standards for aquatic products.
Working principle
* positive access to water:
When the inlet pressure is greater than the outlet pressure, the two check valves are opened and the drainer is closed. The flow loss is less than 0.04Mpa. at 2m/s flow rate.
Reverse closing:
When the inlet pressure is less than or equal to the outlet pressure, the two check valves are closed and the drainer opens.
If there is no garbage jam, the two check discs are sealed and closed, the drain outlet is not drained, the middle chamber communicates with the atmosphere, and the pressure in the middle chamber is zero.
Prevention of backflow pollution:
When the inlet pressure is less than the outlet pressure, the two check discs are closed, and the drainer is open. If one or two check discs have garbage blockage at the valve orifice, the leakage media will flow to the middle chamber, and the leakage media will be discharged directly through the drainer to prevent backflow pollution at the inlet end.
Design and manufacturing standards
1) manufacturing standard: machinery industry standard JB/T11151-2011 "low resistance reverse flow preventer"
2) design standard: national standard GB50015-2003 "code for design of building water supply and drainage" (08 edition)
China Construction Association standard CECS259-2009 "low resistance reverse flow preventer application technology specification"
Atlas of national building standard design 06SS109 "selection and installation of pipe network stacking type water supply equipment" P50~52
Selection and Installation of Low Resistance Backflow Preventers and Vacuum Breakers
product type
1. Built-in drainage type low resistance reverse flow preventer.
DN less than 50 threaded connection
Divided into: LHS711X type DN15-DN25
LHS712X DN32-DN50
Among them: LHS711X products do not detect ball valves and import filters.
DC type low resistance reverse flow preventer
Flange connection
Model: LHS743X DN50-DN200
Online maintenance type low resistance reverse flow preventer
Flange connection
Model: LHS745X DN150-DN400
Imported filters and expansion flanges.
型號 | 公稱通徑 | 外形尺寸 | 材質 | 壓力等級 | |||
Mm | 英寸 | L | H | H1 | 全不銹鋼 | PN10 PN16 | |
LHS711X | 15 | 1/2 | 132 | 75 | 38 | ||
20 | 3/4 | 132 | 75 | 38 | |||
25 | 1 | 135 | 75 | 38 | |||
LHS712X | 32 | 11/4 | 260 | 128 | 64 | ||
40 | 11/2 | 260 | 128 | 64 | |||
50 | 2 | 280 | 172 | 82 | |||
LHS743X | 50 | 2 | 185 | 270 | 160 | 殼體：球墨鑄鐵 或不銹鋼 內件：不銹鋼 | |
65 | 21/2 | 210 | 286 | 166 | |||
80 | 3 | 225 | 310 | 176 | |||
100 | 4 | 250 | 335 | 195 | |||
150 | 6 | 340 | 410 | 235 | |||
200 | 8 | 400 | 466 | 266 | |||
LHS745X | 65 | 21/2 | 320 | 330 | 190 | 殼體：球墨鑄鐵 內件：不銹鋼 | |
80 | 3 | 450 | 350 | 210 | |||
100 | 4 | 500 | 385 | 230 | |||
150 | 6 | 600 | 510 | 285 | |||
200 | 8 | 760 | 656 | 336 | |||
250 | 10 | 950 | 830 | 430 | |||
300 | 12 | 1070 | 980 | 510 | |||
350 | 14 | 1270 | 1000 | 600 | |||
400 | 16 | 1430 | 1250 | 680 | |||
The best quality, first-class service Qigao creates more value for you!
"Qigao Valve" expects to continuously improve service quality and strive for excellence. "Sincere service" is the eternal theme of "Qigao". "Qigao" strictly followsIS09001-2000 Quality system certification requirements, strict quality control, responsibility to people, to ensure the healthy operation of production, sales and service. Strengthen communication with users and provide quality products to our customers with perfection and perfect service. Hereby our factory makes the following commitments:
Product Standards：
Products in strict accordance with ChinaGB、HG Standard and USAPISuch as standard design, manufacturing, acceptance. The hardness of the sealing surface meets the requirements of the state and the width exceeds the national standard.
pre-sale service：
Product introduction, technical exchange, non-standard product design, troubleshooting。
Sale service：
A trustworthy contract guarantees timely delivery and keeps in touch with customers. For special or duplicate products, our factory arranges technicians to use and troubleshoot the products for users.
After sales service：
1、"Qigao" brand product quality period is from the factory12In the month, the implementation of the "three guarantees" service (return, replacement, warranty).
2、During the use of our products, our factory regularly organizes technical and quality inspection personnel to visit and consult users for feedback on product quality, usage status and improvement opinions, so as to further improve product quality.
3、Respond quickly to the quality of user complaints, after-sales service personnel rushed to the scene in 24-36 hours (48 hours outside the province).
4、For after-sales service, users are required to fill out the quality feedback information form after the service and make an appraisal opinion in order to improve the service quality of Qigao.
1、If the customer has special requirements for the product, the following instructions must be provided in the order contract.：
a、Structure length；
b、Connection Type；
c、Nominal diameter, full diameter, reduced diameter, pipe size;
d、Operating medium and temperature, pressure range；
e、Tests, inspection standards and other requirements
2、The factory can configure various types of driving devices according to customer's specific requirements.。
3、If the type and model of the valve are determined by the customer, the customer shall correctly state the meaning and requirements of the model and sign the contract under the condition that the supplier and the buyer understand each other.
4、For futures and order customers, please call us in advance to tell the required valve model, specification, quantity, delivery time and location, and timely transfer to the factory account according to the total 30% deposit or full payment. The rest of the payment is pending. Import before shipment to arrange delivery in time.
Order Process：
1、Customer purchase list fax to021-33872143，Or call us 021-33872141
2、Receive customer purchase list, provide valve model selection and quotation (price list)。
3、Specific agreement: delivery date, special requirements, etc.。
download Google：
1、If the customer has special requirements for the product, the following instructions must be provided in the order contract.：
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2、The factory can configure various types of driving devices according to customer's specific requirements.。
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3、If the type and model of the valve are determined by the customer, the customer shall correctly state the meaning and requirements of the model and sign the contract under the condition that the supplier and the buyer understand each other.
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4、For futures and order customers, please call us first to tell the required valve model, specifications, quantity, delivery time and location, and press the total30%The deposit or full payment will be remitted to our factory account in time.， The rest of the payment will be remitted before shipment to arrange delivery in time.。
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Sale service：
Trustworthy contract, guarantee timely delivery, keep in touch with customers at any time。
For special or duplicate products, our factory arranges technicians to use and troubleshoot the products for users.
After sales service：
1、"Qigao" product quality period is from the factory12Month, practice“Three packs”Service (return, replacement, warranty)。
2、During the use of our products, our factory regularly organizes technical and quality inspection personnel to visit and consult users for feedback on product quality, usage status and improvement opinions.，
In order to further improve product quality。
3、Respond quickly to the quality of user complaints, after-sales service personnel24-36Hours (outside the province48Hour) rushed to the scene。
4、For after-sales service, the user is required to fill out the quality feedback information form after the service and make an appraisal opinion in order to improve the service quality of “Qigao”.。
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