Flange Type Rubber Check Valve
Flange Type Rubber Check Valve
Flange Type Rubber Check Valve
Flange Type Rubber Check Valve
Flange Type Rubber Check Valve
Flange Type Rubber Check Valve

Flange Type Rubber Check Valve

  • BrandLanphan
  • ColorCustomized
  • OriginZhengzhou, Henan, China
Flange Rubber Slowly-closing Check Valve is a newly designed valve product whose appearance is like a duck mouth, it relies on flange to connect to pipe. It has the function of “forward inflow, reserve flow cut off”. 
Flange type rubber check valve
Product Description

Flange type rubber check valve’s diameter gradually reduce along flow direction, and gradually forming a duckbill shape sealing parts, so it is also called flange type rubber duckbill valve. Please note that the nominal diameter is larger than DN800, the body weight will be very large, when operation, a lot of remain water will be left in the abdominal cavity body and water impact effect, a supporting rod shall be increased. It can prevent flood and waste water to flow backward to sewer and basement, and avoid heavy loss; it can prevent flood to flow backward to waste water plant and drainage pump station; prevent waste water or peculiar smell fluid spread and can drain away water at any time; In rainy season, rubber check valve can prevent the flood of inland river from sewer to street; The quality is better than flap valve, and overcome the uptight close disadvantage of flap valve. Rubber material usually is Natural rubber and Neoprene rubber. Natural rubber is fit for waste water which includes alkali and acid; Neoprene rubber can wear UV,and fit for outdoor environments. Flange material is carbon steel or stainless steel. Drilling can be according to .DIN,BS EN, ASME, JIS and other standards.

Working principle

It is a full rubber structure, with "positive inflows reverse backstop" new drainage valve product features. It is calculated based on stress analysis and stress for different conditions, different design mechanisms, use of different rubber formulations, make according to a special process . When forward, the water floods from the inlet and tiny water pressure, will be able to open the valve. The greater of the pressure, the valve opens larger, the greater of the water flow. Reverse work, valve port close naturally, sealed backstop, the larger back pressure, the more tightly of the valve port, sealing the better, maximum back pressure which can be made to withstand varying degrees by an elastic material and the rubber compound.

Product Features

  1. Automatically open and close according to pressure differential pressure, safe and reliable, no noise, no need of personnel to operate, no maintenance;
  2. Forward turn-resistance, a small start-up pressure and flow naturally adjusted according to the water pressure;
  3. Reverse backstop sealed, no leaks, it prevents backflow, the greater the back pressure, the better the results;
  4. Anti-corrosion, anti-aging, deformation, adaptability, long service life;
  5. A wide range of sizes, nominal diameter DN50 ~ DN3000.


Type Nominal dia. of pipe L for length H for height C for external dia. of flange
XF50-150-F 50 150 100 150
XF80-220-F 80 220 140 200
XF100-250-F 100 250 200 225
XF150-340-F 150 340 265 275
XF200-420-F 200 40 325 338
XF250-520-F 250 520 425 400
XF300-620-F 300 620 525 485
XF350-700-F 350 700 625 525
XF400-800-F 400 800 725 588
XF450-900-F 450 900 825 625
XF500-980-F 500 980 925 688
XF600-1120-F 600 1120 1025 800
XF700-1180-F 700 1180 1125 969
XF800-1350-F 800 1350 1400 1080
XF900-1500-F 900 1500 1525 1150
XF1000-1600-F 1000 1600 1725 1325
XF1200-1840-F 1200 1840 1950 1485

Length and height in the table only for reference valve.

product details product details


  1. Applies to the sewage system;
  2. Applies to the exhaust system;
  3. Suitable for dam discharge;
  4. Applicable to the airport, highway drainage;
  5. Suitable for sewer discharge;
  6. Applies to sewage pond discharge;
  7. Odor barrier.


our service

Pre-Sales Service

  1. According to product’s using condition, technicians will offer rationalization proposals to assist clients to select proper types;
  2. Provide detailed product performance specification;
  3. Provide professional quoted price;
  4. Provide 24-hour technical consulting reply.

In-Sales Service

  1. Begin to supervise from raw material, its qualified rate can reach to 100%;
  2. Whole manufacturing process are in strict accordance with promised procedure requirements, product qualified rate can reach to 100%;
  3. Provide product’s inspection record of key junctures to customers;
  4. Provide production schedule photos to customers at regular intervals;
  5. Package and transport products strictly accordance with export standard.

After-Sales Service

  1. Under the premise of correct installation, normal maintenance and using, we guarantee one-year warranty period;
  2. When warranty period has expired, our sold products enjoys lifetime guarantee repair, we only charge cost price for changing product’s standard component and sealing component;
  3. During installation and adjustment period, our after-sale service staff will communicate with customers frequently to know product’s running state in time. Assist customers to install and adjust products until customers are satisfied;
  4. If product has malfunction during operation period, we’ll offer you satisfied answer in time. We’ll reply you within 1 hour and provide solution or send staff to spot within 24 hours after receiving maintenance notification.
  5. Lifelong free technical support. Conduct satisfaction survey and inquiry equipment running condition to clients by telephone or e-mail semiannually from the first day of equipment running, put on records of acquired information.


  1. Can your rubber check valve's flange can connection with ASME flange?
    Yes, besides ASME flanges, we can also drill DIN, BS EN, JIS , and customized.
  2. Is your rubber check valve's length and duckbill height adjustable?
    Yes, we can change according to the actual using condition.
  3. What's the largest Diameter?
  4. Besides flange connection, what else types can you make?
    We can also make clamp type, insert type, built-in type, slurry type.
  5. What's your MOQ?
    MOQ is 1 set.

customers packaging & shipping


  1. Lanphan rubber check valve service life is long, it can avoid change frequently.
  2. The ID, length and height can be changed and customized.
  3. Competitive Price.
  4. 12 months warranty from the date you receive the check valves.
  5. On time delivery time, no optional delay.
  6. ISO and SGS certificate.
    You could fill out the form below and leave your contact information and product requirements, we will contact you ASAP. In order to get in touch with you in time, please complete your CONTACT INFORMATION and REQUIREMENTS.
    Contact Us
    Contacts : Lanphan
    Phone : +86-371-67447999
    Email : [email protected]
    Wechat : +86-13783661974
    Address : Room801, Building B, CC Mall, Jianshe Road, Zhongyuan District, Zhengzhou, Henan, China
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