About Flange

The flange in malleable cast iron pipe fittings is an important component used to connect pipes,
valves, and equipment. It is usually made of malleable cast iron and has the characteristics of
high strength, pressure resistance and good sealing. The flange fixes two pipes or equipment
together by bolting and ensures the sealing of the connection. It is widely used in construction,
water supply, fire protection, HVAC, industrial pipelines and other fields.
Main features:
1.High strength and pressure resistance: Malleable cast iron flange is made of malleable cast iron
material. After heat treatment, it has high mechanical strength and can withstand greater
pressure and impact. It is suitable for high-pressure pipeline systems.
2. Good sealing performance: The flange connection is usually equipped with sealing gaskets
(such as rubber gaskets, metal gaskets, etc.), which can effectively prevent liquid or gas leakage
and ensure the safe operation of the pipeline system.
3. Easy to install and disassemble: The flange is connected by bolts, which is very convenient to
install and disassemble, and is convenient for the maintenance and repair of the pipeline system.
4. Various specification: Malleable cast iron flanges have rich specifications and models. You can
choose the appropriate flange type according to the pipe diameter, pressure level and medium
characteristics, such as flat welding flange, butt welding flange, threaded flange, etc.
5. Wide application range: Malleable cast iron flanges are suitable for a variety of occasions, such
as building water supply, fire protection system, HVAC, industrial pipelines, etc., especially for
pipeline systems that require frequent disassembly or high-pressure environments.
Production process:
The production of malleable cast iron flanges mainly includes steps such as casting, heat
treatment and machining. First, the flange blank is made by casting process, then heat treatment
is carried out to improve its strength and toughness, and finally machining is performed to
ensure the dimensional accuracy and surface finish of the flange.
Application scenarios:
Malleable cast iron flanges are widely used in various pipeline systems, mainly in the following
scenarios:
Pipeline connection: used to connect two pipes to ensure the continuity and sealing of the
pipeline system.
Equipment connection: used to connect pipelines with valves, pumps, filters and other
equipment to facilitate the installation and maintenance of equipment.
High-pressure system: Applicable to pipeline systems that need to withstand higher pressures,
such as industrial pipelines, fire protection systems, etc.
Common types:
1. Flat-weld flange: Applicable to low-pressure pipeline systems, simple installation and low cost.
2. Butt-weld flange：Applicable to high-pressure pipeline systems, with high strength and sealing.
3. Threaded flange: Applicable to small-diameter pipelines, connected by threads, easy to install.
In short, malleable cast iron flanges have become an indispensable and important component in
pipeline systems with their high strength, good sealing and convenient installation, and are
widely used in various engineering projects.