Heavy-Duty Repair for Big Mains
The Large Diameter Bell Repair Clamp handles leaks on DN400 and larger socket connections. Big transmission mains carry water to millions of people. A leak on these pipes is a major emergency. Traditional repair would need a huge shutdown and drain-down. Our clamp repairs big bell leaks without stopping water flow.
Large diameter sockets are heavy and complex. The housing walls are extra thick. The bolt sizes and bolt counts are increased. This gives enough clamping force for big pipe pressures. The housing is precision-cast with tight dimensional accuracy. It fits the bell contour closely. The gasket cross-section is optimized using finite element analysis. This ensures even bolt force distribution across the entire sealing surface.
Our annual sales exceed 80 million RMB. Large diameter products make up a significant portion of this. We have large CNC machines that can machine parts up to DN800. Our sales and service network covers all provinces in China. We respond quickly to urgent customer needs.
Designed for High-Stress Applications
The Large Diameter Bell Repair Clamp uses thicker housing walls and larger 8.8 grade bolts. The bolts are arranged in multiple rows for even clamping. The EPDM gasket is wider and thicker for more sealing area. The housing has rib reinforcements for extra rigidity. This prevents deformation under high water pressure and soil loads.
A provincial capital city had a DN600 main bell crack. The leak lost over 200 tons of water per hour. This main supplied one-third of the city's water. The water company used our Large Diameter Bell Repair Clamp. From call to completion, the repair took six hours. Traditional pipe replacement would have taken two days. They avoided a massive city-wide outage.
We accept third-party inspections. We welcome clients to visit our factory and witness product testing. Every large diameter clamp comes with two spare gasket sets. This helps with future maintenance. The epoxy coating is cured at 200°C for high hardness and scratch resistance. This protects the housing during transport and installation.
Technical Parameters
|
Parameter |
Specification |
|
Diameter Range |
DN400 – DN800 (larger sizes on request) |
|
Working Pressure |
≤1.6 MPa |
|
Housing Material |
QT450 ductile iron (reinforced, extra wall thickness) |
|
Sealing Material |
EPDM rubber |
|
Bolt Grade |
8.8 high-strength steel (oversized) |
|
Surface Treatment |
Epoxy powder coating (high-temp cure) |
|
Application |
Large transmission main bell repairs |
|
Warranty |
10 years (with two spare gasket sets) |
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