Manhole Cover with China Quality on Sale

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Loading Port:
Tianjin
Payment Terms:
TT OR LC
Min Order Qty:
1000 m.t.
Supply Capability:
100000 m.t./month

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Item specifice:

Material: Ductile Iron Standard: round Power Supply: AC Power,DC Power,Gasoline,Diesel
Customized: Customized,Non-Customized Surface Treatment: Zinc Plated,Nickel Plated,Copper Plated

Product Description:

1.Ductile Iron Manhole Cover Description :
A manhole cover is a removable plate forming the lid over the opening of a manhole, to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.
A manhole cover sits on metal base, with a smaller inset rim which fits the cover. The base and cover are sometimes called "castings", because they are usually made by a casting process, typically sand-casting techniques.
2.Main Features of the Ductile Iron Manhole Cover:
•High endurance
•High Strength
•Pressure Resistence
•Anti-corrosion
•Anti-theft
•Good visual effect
Consequences of temporarily overloading
Temporarily overloading may cause smash of concrete covers, seriously deformation, even slightly split. But this will not happen to FRP fiber cloth manhole cover.
Safety options
There is no metal contain, directly reducing potential accident or further maintenance costs caused by thieves. Anti-slip surface offer a safe road condition even in extreme weather.
Light weight
Compared with cast iron manhole cover, FRP manhole cover is 30% lighter.
Light weight allows more loading per vehicle, more convenient transportation and economical savings.
Allows a safer working condition, which single workers is enough for installation without risk of injury.
3.Manhole Cover Images:

Manhole Cover with China Quality on Sale

Manhole Cover with China Quality on Sale

4.Manhole Cover Specifications:
1) Production information
Manhole cover are manufactured for construction and public use. Manhole cover shall be smooth and free sand holes, blow holes, distortion or any other defects
2) Material 
A) Ductile iron GGG50
B) Grey iron GG20 
3) Designs
A) EN124 Class B125 C250 D400 F 900, with different size and grammage, or as  customers' requirement.
B) as per customers' drawing or samples

4) Process
A) Molding boards
B) Hand Casting
5) Coating
A) black bitumen or epoxy .
B)Coating as per customer's requirement
BS EN124 A15 A50 B125 C250 D400
Watertight Waterproof
Lockable Bolts
Anti UV Antistatic Finish
BS EN124 A15 A50 B125 C250 D400
Watertight Waterproof
Lockable Bolts
5.FAQ:
Q. I’ve measured my clear opening size but none of your covers match it, can you offer anything?
A. It’s likely that your cover is quite old and in imperial measurements which are no longer manufactured. However, we can offer bespoke solutions with manhole covers made to the specification you require.

Q. The project I’m working on requires a manhole cover with a quality finish, what’s available?
A. Naturally, galvanised steel of black polypropylene aren’t always ideal, and so we offer brass or stainless steel edging, as well as complete stainless steel covers.

Q. Odours are coming through where I have installed my manhole cover, why?
A. Your cover must be sealed and locked, or neoprene sealed, so you would require a T-Range Cover, or if you require a solid top, a selection of the PC range (e.g. PC2BG3, PC6CG3, not PC2BG) are suitable.

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Q:What is the meaning of the gasket / gasket material bar 200HV?
Washer / gasket material bar indicates that 200HV is the material mechanical performance grade for steel 200HV.Example: standard series, nominal size d=8mm, performance grade 200HV, without surface treatment of flat washers: washers GB97.1 - 858 200HVA part between a connector and a nut. A flat metal ring is generally used to protect the surface of the connecting piece from the nut.
Q:What is the reason why the rubber washer is small after use?
Rubber elastic loss (compression permanent deformation large), the rubber will lose the value of the work. If the dynamic load is the damping effect is poor!!! The specific design of rubber products can contact, contact Baidu private message!!
Q:Gasket 300HV relative to what material?
For the 140HV level can choose 08F, 08Al and 10, 10F, etc., the surface hardness can reach about 140HV
Q:In the design, the bolt connection is necessary to have a gasket?
It is best to add a gasket, there is an increase in friction, it is difficult to prevent aging after the screw.
Q:How do you choose the appropriate gasket for bolt or screw connection?
Bolt or screw connection according to its specifications (usually nominal diameter) to choose the appropriate gasket.The specifications of the corresponding gaskets are corresponding to the specifications of the screw bolts.Bolt: a type of fastener consisting of two parts, the head and the screw (with the outer thread of the cylinder), which must be matched with the nut to fasten the connection between the two parts with a through hole.Because the bolt is also a kind of railway accessories, railway accessories is an integral part of the railway line, which refers to the rail, including rail, sleeper, connecting parts, ballast, anti climbing equipment, rail support and switches, etc..As a whole engineering structure, the track is laid on the roadbed, and it plays a guiding role in the train operation, and it directly bears the great pressure of the locomotive and its load. Under the dynamic action of the train, its various components must have enough strength and stability, ensure the train in accordance with the provisions of the highest speed, safe, stable and uninterrupted operation.
Q:Nominal diameter 12 washers, outside diameter?
According to GB/T 95-2002 - C level standard flat washer, nominal diameter (large thread diameter) 12 flat washer, its outer diameter (Max) = 24 mm;(min) = 22.7 mm.
Q:Do not use self tapping screws
Flat washer is generally used in the connecting piece is a soft texture, a hard brittle, its main role is to increase the contact area, pressure distribution, to prevent the soft texture of the crush. The basic function of the spring of the spring washer is to tighten the nut after the nut to a force, increasing the friction between the nut and bolt! The material is 65Mn (spring steel), heat treatment hardness is HRC44 ~ 51HRC, through the surface oxidation treatment.
Q:201 stainless steel gasket and 304 stainless steel gasket which is soft
201, stainless steel bars, stainless steel angle, stainless steel channel, such as Chung Chung, an old customer is scheduled to be 10 tons and the current return of the loan is also a little slow, some tight cash on hand. Coupled with his client's request
Q:What material is used for spring washer
Spring cushion ring: widely used in the mechanical and bearing capacity of the general mechanical products, which is characterized by low cost, easy installation, suitable for frequent loading and unloading parts. But the spring washer is very loose! Especially in Europe and the United States in the current requirements of high reliability products, the use of very low rate, especially the important load-bearing structure of the connection site has been abandoned for many years. Our country has some applications in the military, but has been improved to stainless steel materials. It is said that the steel spring washer in CASC was banned! It is also said to be very unsafe, there are two reasons for the 1 is up ring is hydrogen embrittlement of 2.
Q:A general set of screws have a few nuts, bolts, washers?
You want to see the specific requirements and uses. There is also a nut, a bolt, and a flat pad

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