Manhole Cover with China Quality on Sale

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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
•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
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:Why do you have to add a spring washer when it comes to the role of ah ah ah
Reinforce and prevent looseningImagine the screw into the threaded hole, if the equipment for a long period of vibration, screw and screw combination may be loose, or even fall off
Q:What material is used for spring washer
Usually 65MN spring steel or 70# carbon steel, but sometimes also with 60Si2Mn, can also be used stainless steel material SUS304 or SUS316
Q:Are there any positive and negative points on the flat washer?
In fact, the reason is very simple, smooth side in the beautiful, no corners in the next, the pressure is small, small damage to the workpiece.
Q:Specific conditions for use of spring washers
A large number of materials in electronic and electrical appliances, carbon, stainless steel, copper alloy etc.. WL type corrugated washer: WL type corrugated washer as a mouth elastic washer, it usually can be installed in a small space, such as to reduce bearing prestress bearing running noise, improve the operation accuracy and stability of bearings. In addition to the electronic appliances also have a large number of applications. Materials are carbon steel, stainless steel, copper alloy, etc.. WN type: WN type wave washers wave washer for multilayer wave overlapping elastic gasket, the series and type WL comparison, because is composed of multilayer material, so in the same compression stroke under the curve of K value is WL gentle, suitable for the whole working stroke and large elastic, elastic and uniform release situation.
Q:how much Specification for washers
Stop washer is used in conjunction with nut to prevent loosening of the nut washer. General is divided into round nut with a stop washer, the outer tongue stop washer, ear stop washer, single ear stop washer, etc..
Q:In the design, the bolt connection is necessary to have a gasket?
Bolted components can not be avoided by extrusion, and a flat gasket reduces the wear of the surface of the component when tightening the bolts, especially those of the aluminum material. In parts when the bolt is tightened by extrusion deformation or broken, the torque control is improper. In the mobile phone production line, a lot of workers to install mobile phones, some people do not tighten tight, some people will break the crack parts, so the production line are used to play the role of measuring torque wrench.
Q:How do you choose the appropriate gasket for bolt or screw connection?
Mainly depends on your needs, such as the bolt is M10, you have to choose the matching. A variety of information can be found from the hardware manual.
Q:When is the gasket (flat pad, spring pad)
A washer to prevent loosening of bolts. That is, elastic washer, anti loose washer works very simple. It consists of two washers. The outside is embossed with a radial surface, while the inner oblique tooth surface. When assembled, the medial oblique tooth surface relative to the outer radial surface and both ends of the contact surface relief into the occlusal state when the connectors are vibration, and the trend of bolts loosening, only allow two washers inside oblique tooth relative dislocation, resulting in uplift of tension, so as to achieve the 100% locking.
Q:When do flat washers use GB95 when using GB97.1?
There is no difference in the application. See the tolerance, the high requirements of the use of GB97.1. in order to save money, and the application environment is not high, use GB95
Q:Why do some nuts and washers, and some nuts without washers
General screw diameter and the diameter of the fastening parts of the hole is not large, the nut and parts of the contact area is relatively large, you can not add a gasket

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