The best quality and faith bring us the good market, such as USA, CANADA, BRAZIL, AUSTRALIA, UK, GERMANY, ITALY,        SPAIN,    TURKEY, ALGERIA, DUBAI, RUSSIA, UKRAINE, SINGAPORE, MALAYSIA etc. “Made in DUNHUI” in many Countries.

   “DUNHUI” is your correct choice. Welcome to visit 

1.     pvc manhole cover 

Made of pvc.
Swinging manhole cover with soundproofing gasket and elastic closure.
Optional anti-theft system.
According to EN-124, Class D-400 norms.
SGS Product Certification (RD-4 / D1MR).
Black paint coating.
Non slip metal surface.
Suitable for high traffic routes.
Custom labels possibility.

1. Triple anti-noise patent technology. 

The first patent : Put a rubber cushion between manhole cover and frame. 

The second patent : Make the manhole cover and frame more tighter and matched.

 The third patent : Set a elastic device at the back of manhole cover, in order to avoid manhole cover to deform. 

2. Duplicate anti-theft patent technology.

The first patent : The antitheft protection of manhole cover combined with the lock. 

The second patent : Set a lock on manhole cover, such as general type, professional type, password type, electronic password type.

Packaging & Shipping

    Wooden Pallet, Tied with Stainless Steel Strips  or as your required

Our Services

1. Professions manufacturer of cast iron manhole covers gratings in china.

2.Any sizes and types of Cast Iron manhole covers / gratings can be customized.

3. Manhole cover and road grate sample can be sent. 

4.  Customer marking acceptable  5. Please contact us for more information

   All the pattern or words on the surface of manhole cover if you need, we can manufacture it for you.I represent all my company members welcome every golbal friends to visit our company for our more development and good bussiness with you. 

2.  Products description and Main dimensions

3. Production process

Raw Material Inspection

• Raw Material inspection including chemical
• components analysis, tensile strength test and etc. 

Quality Control Groups

• Dimensions Test
• Manufacture process Inspection
• Process Inspection including sand cleaning, assembling, packing and coating
• Final Inspection including delivery marks and etc.
• Particular Tests for different products, such as Load Test, Hydro Test and etc. 

Laboratory

• Chemical Components
• Microstructure Test
• Tensile Strength

Ductile Iron manhole cover :

1. Classes: A15, B125, C250, D400, E600 and F900.

2. Design Standard:  BS EN124:1994.

3. Material grade: GGG500/7.

4. Test: testing before shipping for the smooth surface and loading.

5. Coating: coating black bitumen, Or coating as customers' requirement.

6. Certificate: SGS, ISO9001.

4. Manhole cover and Gratings pictures

5. Technical Standard: 

 Design: EN124
 Certification: ISO9001:2008 

6.Application Area

 7. Personnel station:

  Have professional salesmen, and 6 Engineers, More than 30 inspectors. 

 8. Quality and Safety:

We have a very strict and complete quality control system, which promises that goods we produced are always of the best quality, the enough inspectors to ensure that each product can meet the quality requirements of customers. We do the final inspection in own factory with ISO 9001:2008.

9.Location:

 DUNHUI has a convenient location at the city’s exporting business zone, Dongli District. We are only 9 km to Tianjin  International Airport, and very close to major highways,TIANJIN port. We look forward to work with your business!