Butterfly Valves Vs. Globe Valves: A Comparative Analysis of Sealing Performance Under API And DIN Standards

API Standards for Butterfly Valves

API 609: Butterfly Valves

• Design and Performance: API 609 is a widely recognized standard for butterfly valves, specifying detailed requirements for design, materials, dimensions, and testing. These valves are known for their simple design, lightweight, and quick operation.

• Sealing Performance: API 609 requires butterfly valves to undergo rigorous testing to ensure they meet specified leakage rates. The standard mandates that valves undergo both hydrostatic and pneumatic tests to verify their sealing capabilities.

• Testing Protocols: The testing includes shell testing, seat leakage testing, and bidirectional sealing tests for valves designed to handle bidirectional flow. The leakage rate is typically measured in terms of bubbles per minute, ensuring minimal leakage under operating conditions.

Key Features

• Robust Design: Butterfly valves designed to API 609 are built to withstand high pressures and temperatures, ensuring reliable performance in demanding environments.

• Quick Operation: The quarter-turn operation of butterfly valves allows for rapid opening and closing, making them suitable for applications requiring quick shutoff.

• Low Maintenance: The simple design of butterfly valves reduces the need for frequent maintenance, lowering overall operational costs.

DIN Standards for Globe Valves

DIN 3356: Globe Valves

• Design and Performance: DIN 3356 is a German standard that specifies the requirements for globe valves, including design, materials, dimensions, and testing. Globe valves are known for their precise flow control and reliable shutoff capabilities.

• Sealing Performance: DIN 3356 requires globe valves to undergo comprehensive testing to ensure they meet specified leakage rates. The standard mandates that valves undergo both hydrostatic and pneumatic tests to verify their sealing capabilities.

• Testing Protocols: The testing includes shell testing, seat leakage testing, and unidirectional sealing tests for valves designed to handle flow in one direction. The leakage rate is typically measured in terms of volume per minute, ensuring minimal leakage under operating conditions.

Key Features

• Precise Flow Control: Globe valves designed to DIN 3356 offer precise control over fluid flow, making them suitable for applications requiring accurate flow regulation.

• Reliable Shutoff: The design of globe valves ensures reliable shutoff, preventing backflow and ensuring system integrity.

• High Pressure Handling: Globe valves are designed to handle high pressures, making them suitable for demanding industrial applications.

Comparative Analysis

Key Differences