Class 900 Lap Joint Flanges are specifically engineered for high-pressure piping systems where alignment ease and frequent maintenance are critical. At Jiangyin Zhonghai Precision Machinery Co., Ltd., we manufacture Class 900 LJFs that pair perfectly with stub ends to provide a robust yet adaptable sealing solution.

Because the flange ring itself does not come into contact with the fluid and can rotate freely on the pipe axis, it is the ideal choice for systems requiring frequent cleaning or those utilizing expensive corrosion-resistant materials. Leveraging our in-house forging, heat treatment, and CNC machining, we ensure every flange meets the rigorous structural requirements of 900-lb service.

Core Advantages
·High-Pressure Expertise: With manufacturing capabilities ranging from Class 150 to Class 2500, our Class 900 products are pressure-tested to ensure stability under extreme hydraulic fluctuations.
·Fully Integrated Manufacturing: From raw ingot forging to final CNC precision drilling, every step is managed under our ISO 9001 certified system, eliminating the quality risks associated with outsourcing.
·Global Compliance & Certification: We hold PED, TUV, and TS certifications, ensuring our products meet the stringent regulatory requirements of international engineering projects.
·Unrivaled Customization: Whether you need standard ASME specifications or complex non-standard designs based on blueprints, we deliver sizes from 1/2" up to 60", with single components weighing up to 10 tons.
·Engineering Consultation: Our team evaluates your material and structural requirements to recommend the most cost-effective forging or machining solution without compromising performance.

Key Features
·Effortless Bolt Hole Alignment: The rotating flange design simplifies the alignment of bolt holes on heavy, high-pressure pipes, significantly reducing labor time and costs.
·Cost-Efficient Design: For corrosive systems, only the Stub End needs to be made of high-grade alloys, while the Lap Joint Flange can be Carbon Steel, drastically reducing the total system cost.
·Superior Forged Integrity: Our internal high-performance forging process ensures a continuous metal grain flow, providing excellent fatigue resistance and toughness under Class 900 loads.
·Precision Sealing Surfaces: Machined to exacting standards to ensure a flush, leak-proof interface with the stub end.

Applications
·High-Pressure Petrochemical: Process lines requiring regular disassembly, cleaning, and maintenance.
·Cross-Country Pipelines: Ideal for difficult terrain where bolt hole alignment of large-diameter pipes is challenging.
·Power Generation: Used in auxiliary and high-pressure water cycles in nuclear and thermal power plants.
·Corrosive Fluid Transport: Paired with stainless steel or alloy stub ends in chemical refineries and offshore platforms.