Body Materials of Butterfly Check Valve

Butterfly check valves, used to prevent backflow in piping systems, are made from various materials depending on the application, fluid type, and operating conditions. The most common body materials for butterfly check valves include:

1. Cast Iron:

Usage: Often used in general water applications, HVAC, and non-corrosive fluid systems.

Properties: Economical, good strength, and durability, but prone to corrosion if not coated.

2. Ductile Iron:

• Usage:Preferred in water and sewage systems, oil and gas applications.
• Properties:Stronger and more flexible than cast iron, offers better corrosion resistance and can handle higher pressures.

3. Carbon Steel:

• Usage:Suitable for high-pressure and high-temperature applications such as oil, gas, and steam systems.
• Properties:Strong and durable, but requires corrosion protection (e.g., coatings or linings) when used with corrosive media.

4. Stainless Steel (304, 316):

• Usage:Common in corrosive environments, such as chemical processing, food, and pharmaceutical industries.
• Properties:Excellent corrosion resistance, especially in environments involving chemicals or saltwater. More expensive but ideal for long-term durability in harsh conditions.

5. Aluminum Bronze:

• Usage:Often used in marine applications or systems involving seawater.
• Properties:High corrosion resistance, particularly in seawater and other saline environments.

6. PVC (Polyvinyl Chloride) / Plastic:

• Usage:Frequently used in low-pressure systems, particularly in chemical or water treatment applications.
• Properties:Lightweight, corrosion-resistant, and economical, but limited by temperature and pressure constraints.

7. Titanium:

• Usage:Used in highly corrosive environments, such as in the chemical industry.
• Properties:Excellent corrosion resistance and high strength-to-weight ratio, but expensive.

Each material is selected based on the specific application requirements, such as pressure, temperature, fluid type, and environmental conditions.

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