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Quick Details

  • Standard or Nonstandard: Standard
  • Structure: Check
  • Pressure: Medium Pressure
  • Power: Hydraulic
  • Material: Stainless Steel, Carbon Steel,Rubber and Carbon Steel
  • Temperature of Media: Normal Temperature
  • Media: Water
  • Port Size: 1/2"Quick
  • Place of Origin: Henan, China (Mainland)
  • Model Number: XF501-150-F
  • Brand Name: LiWei
  • Application: General
  • Technics: Forged
  • Type: Flange
  • Connection: Flange
  • Head Code: Round
  • Shape: Reducing
  • Color: Rubber Black and Blue
  • Medium: Fluid

Packaging & Delivery

Packaging Details out package:wooden case inside package:plastic film and texile membrane we may change as your request
Delivery Time Shipped in 10 days after payment




Product Description



Rubber flexible Check valve


1.Product introduction

      XF rubber slowly-closing cut-off valve is a new water supply and drainage valve with full rubber structure, duck-mouthed appearance and functions of positive flow-in and reserve cut-off. According to thrust analysis and calculation as well as different operation conditions, it is manufactured with different design mechanism and different rubber products by special processing, At positive operation the water flow inform entrance and the valve will be open at weak hydraulic pressure. the hydraulic pressure is higher .The valve gate will open more greatly and the water flow is greater ,At reserve operation, the valve gate closes naturally and seals tightly cut-off valve, the back pressure is higher, the valve gate closes more tightly and the seal effect is better. It is used widely in various drainage exits to prevent from pouring backwards and flowing backwards in city planning, water conservancy and sewage disposal etc, it is the ideal product to replace flap valve.

2.Product characteristics

The advantages are specially marked in comparison with traditional flap valve:

a) Open and close automatically in security and reliability according to hydraulic difference without noise and in no need of operator and maintenance.

b) Positive start has little water resistance and start-up pressure and the flow can be adjusted naturally according to hydraulic pressure.

c) Reserve cut-off has good seal without leakage to prevent from flowing backwards. the back pressure is higher and the effect is barrier.

d) Anticorrosion, aging resistance, deformation resistance, strong adaptability and long use life

e) Wide size scope, nominal diameter of DN50-DN3000.

3.Application scope

Excellent performance and wide application scope

1)Applicable for sewage system

2)Applicable for discharge system

3)Applicable for dyke discharge

4)Applicable for the drainage of airport and freeway

5)Applicable for sewer discharge

6)Applicable for sewage lagoon discharge

7)Smell separation


4.Installation structure type

1) Belled XF-T be installed at the exit of drainage pipe

2) Flanged XF-T be installed at the exit end with flange of drainage pipe

3) Mounting plate XF-F is installed on the building at the water exit end

4) Build-in XF-F is installed at the exit end of rain and sewage system in cities

5) Grout or cement pipe XF-T be installed at the end of grout or cement pipe

5.Belled rubber slowly-closing check valve:




Installation specification


1) Reparation before installation

a) Please check whether the conditions are in conformance such as mode and valve type; installation type, technical parameter and technical requirements (pressure resistance or back pressure temperature resistance and anticorrosion conditions)

b) Check whether there is personal damage and dirty thing in valve.

c) Check whether the surface of pipe installed or the joint flange have burr and de formation and are smooth and leveled.

2) Installation procedure

a)the inner diameter r should match with the external diameter of joint pipe in the installations of belled rubber slowly –closing check valve, the in-setting depth should accord to corresponding requirements, water rubber can be spread on the surface of pipe and rubber gasket should used at dog mouth , then the bolts are connected tightly, if assistant liner pipe is adopted for rubber slowly –closing check valve ,the assistant liner pipe and remained pipe and remained pipes should sealed and welded firmly and reinforcement bar should be increased properly to promote the intensity and rigidity when the connection operation is made .

b)in flanged installation ,the exit flange size of rubber slowly –closing check valve ,sealing pad should be installed between flange as appropriate to guarantee the absolute seal after connection it should be noticed that the flange lip of rubber slowly –closing check valve can’t be damaged,

c) For other installation, the mentioned requirements can be taken for reference,

d)when the nominal diameter is more than dn800,a support drag bar should be prepared to lift valve body solidly for long term by the flying ring of valve body because the weight of valve body is large and a lot of water and flow impacts in the valve body

3) Cautions

a) The valve body should be prevented from non –standard operation in the removal, storage and installation for valve body

b) The valve bodies are strictly prohibited to avoid if the valve bodies is stored for long team.

c) No maintenance is needed in normal application but the valve body should be protected from puncturing by hard materials,

d) The working position shouldn’t be pressed by things to protect its natural switch

Notice for order

a) Users should provide filed operation conditions explain and technical requirements.

b) User should provide necessary technical parameter including nominal diameter of pipe, joint external diameter, installation type and the valves of positive star pressure and reserve cut-off back pressure.

c) Our technicians will select type and design for users according to the request of users.

6.Flange rubber slowly-closing check valve



Packaging & Shipping


Packaging : Flexible check valve out package:wooden case inside package:plastic film and texile membrane,we may change to meet your requirments

Shiping: 7-40 days based on your order

Our Services



Board of directors: what we need is not profit but to create more benefits for clients

Technical department: what we should do is to keep unceasing innovation till complete energy saving

Sales department: what we need is not sales but how to select types for users

Production department: what we need is not out but how to ensure the quality

After-sale department: what we do is to establish a technical team and collect equipment operation data

Quality check department: what we need is not check the data but measure whether the work meets standards or not

If you have special or other questions,please don't hesitate to contact us seeking for help

Henan Liwei Industrial Co., Ltd.

Address:No.68,Mengjin Road,Shangjie District,Zhengzhou,Henan,China

Tel:+86-371-68921527/68932887         Fax:+86-371-68929024

Mobile:15237196832                           Contact: Crystal




Company Information




      Zhengzhou Liwei Pipeline Equipment Co., ltd. (the former Zhengzhou Liwei Rubber Products Co., Ltd.) located at Shangjie District. Zhengzhou city is a manufacturer specializing in processing various steam, water, windpipe expansion and compensation joints, and a main base for producing rubber, metal and non-metallic pipe joints, It is also the appointed enterprise by the former chemical industry ministry, national construction ministry and general petrol chemical company member unit China Water Supply Association and power Equipment Network Union, and joints production unit recommended by China Water Association and National Metallurgy Ministry.

      Our Liwei brand flexible rubber joints have various heavy calibers, type and high quality in the county, The products series have won four patents and our company is named “Quality and Credit Unit” by Henan Province, Our product have become the first choices for national power design ,municipality and metallurgy units.

       At present, our product include four serial flexible rubber joints, three types, tens of standard and common specification, eight series of metal pipe loosing compensation joints and fourteen standard specifications and types, eleven types of standard and common specification products for serial wind pipe non-metal compensators. Our annual comprehensive production capacity can reach over forty thousand sets and we also process various pipe joint matching flat welding flanges (steel international/non-international standard). Our products have been sold in over thirty cities and autonomous regions, With China’s entry to the WTO; our products have been exported to foreign countries as Italy. Spain, Pakistan. Singapore and East European countries, etc, and the products have been become public famous brand products for design units and clients.

       Our company has been equipped with rich technical strength, excellent design and complete design and complete products test measures. We also own a set of strict management system and high-quality technicians, In2004; we have gained quality management and environment management authentication.

       Insisting on the rennet “Development Through Technology, Making More Friends, Creating Green Environment and Responsible for Future”, the company has been devoting itself to creating top products and well serving all clients around the world, Liwei brand products will be a red line between we and the clients for ever.


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