# API 607 vs API 608: Key Differences and Applications

Introduction

When it comes to industrial valves, understanding the standards that govern their design, testing, and performance is crucial. Two important standards in the valve industry are API 607 and API 608. While they may seem similar at first glance, they serve different purposes and apply to different types of valves. This article explores the key differences between API 607 and API 608, their respective applications, and why these distinctions matter for engineers and procurement specialists.

What is API 607?

API 607 is a standard that specifies fire testing requirements for quarter-turn valves and actuators. The full title is “Fire Test for Quarter-turn Valves and Valves Equipped with Nonmetallic Seats.” This standard ensures that valves can maintain their integrity and operability when exposed to fire conditions.

Key aspects of API 607 include:

• Testing procedures for fire resistance
• Performance requirements during and after fire exposure
• Evaluation criteria for leakage rates
• Applicability to soft-seated quarter-turn valves

What is API 608?

API 608 is titled “Metal Ball Valves – Flanged, Threaded, and Welding End.” This standard covers the design, materials, dimensions, testing, and inspection requirements for metal ball valves. Unlike API 607, API 608 is not specifically focused on fire testing but rather establishes general manufacturing and performance standards.

Key features of API 608 include:

• Design requirements for full-port and reduced-port ball valves
• Material specifications
• Pressure-temperature ratings
• Testing requirements (hydrostatic and shell tests)
• Marking and documentation standards

Key Differences Between API 607 and API 608

Feature	API 607	API 608
Primary Focus	Fire testing and performance	General design and manufacturing
Valve Types	Quarter-turn valves with nonmetallic seats	Metal ball valves
Testing Requirements	Fire resistance testing	Hydrostatic and shell testing
Application	Critical services where fire safety is paramount	General industrial applications

Applications of API 607 Valves

API 607 compliant valves are typically used in industries where fire safety is critical. Common applications include:

• Oil and gas processing facilities
• Petrochemical plants
• Refineries
• Offshore platforms
• Any location where flammable materials are present

Applications of API 608 Valves

API 608 valves find application in a wide range of industrial settings where reliable ball valve performance is required:

• Chemical processing
• Power generation
• Water treatment
• General industrial piping systems
• HVAC systems

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