Ever wondered where the world’s pressure manhole covers come from? China’s a major player, but with so many factories, choosing the right supplier can be tough. Comparing the top factories is crucial for getting quality products at competitive prices, ensuring safety and long-term reliability for your projects. Knowing the best options saves you time, money, and headaches. Ready to discover the cream of the crop? Let’s dive into our comparison of China’s leading pressure manhole cover factories!

High pressure round manhole cover – China Donjoy Technology Co.,Ltd

Product Details: High pressure round manhole cover, available in various sizes (400/350/400/450/500/600/800) and heights (100, 120, 150). Features outward opening cover, plastic or stainless steel hand wheel, optional flange or union type sight glass. Materials include AISI304(1.4301)/316L(1.4404). Certifications: 3-A-84-02; FDA177.2600.

Technical Parameters:
– Max. pressure: 10 bar
– Surface finish: Ra 0.8um-0.5um

Application Scenarios:
– Pressure vessels in food industry
– Pressure vessels in wine and beverage industry
– Pressure vessels in pharmaceutical industry

Pros:
– High pressure resistance
– Various size and material options

Cons:
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Buy Ductile Iron Manhole Cover from GTC (China) industry co., ltd …

Product Details: Ductile iron manhole cover available in square, circular, and rectangular shapes. Dimensions range from 200mm to 1000mm. Materials include ductile iron and grey iron. Coatings include black bitumen and epoxy resin. Colors are black and grey, or customizable. Available in various loading pressures: A15, B125, C250, D400, E600, F900. MOQ is 1 ton. Packaging is pallet or wooden case, customizable. Production capacity is 10000 tons per year. Production time is 10-30 working days after payment.

Technical Parameters:
– Material: Ductile iron, Grey iron
– Dimension: 200mm~1000mm
– Standard: EN124
– Loading Pressure: A15, B125, C250, D400, E600, F900
– Coating: Black bitumen, Epoxy resin
– Type: Square, circular, rectangular

Application Scenarios:
– Road construction
– Natural gas
– Water supply and drainage
– Telecommunications

Pros:
– Strict quality control system
– ODM & OEM service available
– Samples available

Cons:
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stainless steel pressure manhole cover – TradeWheel

Product Details: Stainless Steel Pressure Manhole Cover

Technical Parameters:
– Material: Stainless Steel 304, 316
– Dimensions: DN300-800
– Model Number: BLS-RK, YAB,YAC,YAD,YAW
– MOQ: 1 Piece/Pieces

Application Scenarios:
– stainless steel tank

Pros:
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Cons:
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Cast iron manhole covers – TradeWheel

Product Details: Cast iron manhole covers in various sizes and designs, including round, square, octagon, and double-deck options. Materials include Ductile Iron GGG500-7/450-10. Coatings include cold applied black bitumen, no coating, or custom coatings.

Technical Parameters:
– Dimensions (various, see table)
– Height (various, see table)
– Weight (various, see table)
– Material: Ductile Iron GGG500-7/450-10
– Designs: EN124 A15, B125, C250, D400, E600 and F900
– MOQ: 1 pc
– Port: TIANJIN, CHINA
– Packaging: WOODEN PALLETS
– Lead Time: 7 DAYS

Application Scenarios:
– Manhole covers for various applications

Pros:
– Various sizes and designs available
– Durable cast iron construction

Cons:
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Tilting Manhole Cover: A Nonlinear Spring-Mass System

Product Details: Insufficient information provided

Technical Parameters:
– Insufficient information provided
– Insufficient information provided

Application Scenarios:
– Insufficient information provided
– Insufficient information provided

Pros:
– Insufficient information provided
– Insufficient information provided

Cons:
– Insufficient information provided
– Insufficient information provided

Ss316l Pressure Manway Sanitary Manhole Cover For Tank

Product Details: Ss316l Pressure Manway Sanitary Manhole Cover For Tank

Technical Parameters:
– Valve Body Material: 1.4404/1.4301, SS304/SS316L(Forged)
– Seal Material: EPDM (standard) conforms to FDA177.2600
– Surface Finishing: RA 0.5 to 0.8 um
– Pressure: 5.0 Bar
– Max. Working Tem.: 120 degree C
– Available Size: 200, 220, 300, 350, 400, 430, 450, 500, 600
– Gasket: EPDM, silicone or Viton
– Height: 100,120,150
– Certificate: PED 2014/68/EU, FDA.177.2600

Application Scenarios:
– Tank

Pros:
– Made of SS316L stainless steel
– Sanitary design
– Pressure resistant

Cons:
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Vessel manways, handholes pose special sealing challenges – Reliable Plant

Product Details: Spiral-wound gaskets, corrugated metal core gaskets with graphite facing, flexible graphite sheets, Kammprofile gaskets, PTFE gaskets.

Technical Parameters:
– Inner width x inner length x gasket surface width x thickness
– Pressure rating (psi)
– Flange width
– Filler material and thickness (for spiral-wound gaskets)
– Metal core thickness and corrugation (for corrugated metal gaskets)

Application Scenarios:
– Manways and handholes in tanks and pressure vessels
– Boiler manholes and handholes
– Chemical service applications (for PTFE gaskets)
– High-pressure and high-temperature applications

Pros:
– Effective sealing in various pressure ranges
– Suitable for less-than-perfect flange surfaces
– Withstands extreme temperature and pressure excursions (Kammprofile gaskets)

Cons:
– Low and uneven compressive force from limited bolting
– Potential for gasket blowout in lower-pressure systems with soft gaskets
– Difficulty in sealing high-pressure vessels with rigid gaskets
– Adhesives may fail at high temperatures or in chemical service

Related Video

Comparison Table

Company	Product Details	Pros	Cons	Website
High pressure round manhole cover – China Donjoy Technology Co.,Ltd	High pressure round manhole cover, available in various sizes (400/350/400/450/500/600/800) and heights (100, 120, 150). Features outward opening cov…	– High pressure resistance – Various size and material options	– Generic placeholder – Generic placeholder	www.cndonjoy.com
Buy Ductile Iron Manhole Cover from GTC (China) industry co., ltd …	Ductile iron manhole cover available in square, circular, and rectangular shapes. Dimensions range from 200mm to 1000mm. Materials include ductile i…	– Strict quality control system – ODM & OEM service available – Samples available	– Generic placeholder – Generic placeholder	www.tradewheel.com
stainless steel pressure manhole cover – TradeWheel	Stainless Steel Pressure Manhole Cover	– Generic placeholder for pros – Generic placeholder for pros	– Generic placeholder for cons – Generic placeholder for cons	www.tradewheel.com
Cast iron manhole covers – TradeWheel	Cast iron manhole covers in various sizes and designs, including round, square, octagon, and double-deck options. Materials include Ductile Iron GGG5…	– Various sizes and designs available – Durable cast iron construction	– Generic placeholder – Generic placeholder	www.tradewheel.com
Tilting Manhole Cover: A Nonlinear Spring-Mass System	Insufficient information provided	– Insufficient information provided – Insufficient information provided	– Insufficient information provided – Insufficient information provided	asmedigitalcollection.asme.org
Ss316l Pressure Manway Sanitary Manhole Cover For Tank	Ss316l Pressure Manway Sanitary Manhole Cover For Tank	– Made of SS316L stainless steel – Sanitary design – Pressure resistant	– Generic placeholder – Generic placeholder	www.tradeindia.com
Vessel manways, handholes pose special sealing challenges – Reliable Plant	Spiral-wound gaskets, corrugated metal core gaskets with graphite facing, flexible graphite sheets, Kammprofile gaskets, PTFE gaskets.	– Effective sealing in various pressure ranges – Suitable for less-than-perfect flange surfaces – Withstands extreme temperature and pressure excursio…	– Low and uneven compressive force from limited bolting – Potential for gasket blowout in lower-pressure systems with soft gaskets – Difficulty in sea…	www.reliableplant.com

Frequently Asked Questions (FAQs)

What types of pressure manhole covers do Chinese factories produce?

You’ll find a wide variety, including ductile iron, cast iron, composite, and even stainless steel pressure manhole covers. Many factories offer customized options to meet specific project requirements, such as size, weight, and pressure ratings. They cater to diverse applications, from water and sewer systems to industrial settings.

How can I ensure the quality of pressure manhole covers from a Chinese factory?

Thorough due diligence is key. Look for factories with certifications like ISO 9001, which demonstrates a commitment to quality management. Request samples for testing and examine past project references. Consider on-site inspections to assess manufacturing processes and quality control measures. Clear communication and a well-defined contract are also crucial.

What are the typical lead times for orders from Chinese pressure manhole cover factories?

Lead times vary depending on order size and factory capacity. Smaller orders might be fulfilled within a few weeks, while larger projects could take several months. It’s always best to discuss lead times directly with the factory and factor in shipping time when planning your project timeline.

What are the typical payment terms offered by Chinese pressure manhole cover factories?

Common payment terms include Letters of Credit (LCs), Telegraphic Transfers (TTs), and sometimes, a combination of both. Negotiating payment terms is part of the process, and you should discuss your preferred method and schedule with the factory early in your negotiations. Be sure to understand all associated fees and timelines.

How can I find reputable pressure manhole cover factories in China?

Online B2B platforms like Alibaba and Global Sources are good starting points. Industry directories and trade shows can also connect you with potential suppliers. Remember to thoroughly vet any factory before placing an order, checking for their experience, certifications, and customer reviews. Don’t hesitate to ask for references.