# API 607 vs API 608: Key Differences and Applications

Introduction

When it comes to industrial valves, standards play a crucial role in ensuring safety, reliability, and performance. Two important standards in the valve industry are API 607 and API 608. While they may sound similar, these standards address different aspects of valve performance and applications. Understanding the differences between API 607 and API 608 is essential for engineers, procurement specialists, and maintenance personnel working with industrial valves.

What is API 607?

API 607 is a standard that specifically addresses the 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 evaluates how well a valve can maintain its sealing capability when exposed to fire conditions.

The key aspects of API 607 include:

  • Testing methodology for fire resistance

  • Performance requirements during and after fire exposure

  • Evaluation criteria for leakage rates

  • Requirements for nonmetallic seat materials

What is API 608?

API 608, titled “Metal Ball Valves – Flanged, Threaded, and Welding End,” is a comprehensive standard that covers the design, materials, dimensions, testing, and inspection requirements for metal ball valves. Unlike API 607, which focuses on fire testing, API 608 provides general specifications for ball valves used in various industrial applications.

The main components of API 608 include:

  • Design and construction requirements

  • Material specifications

  • Pressure-temperature ratings

  • Testing procedures

  • Inspection and quality control measures

Key Differences Between API 607 and API 608

Feature API 607 API 608
Scope Fire testing for quarter-turn valves General specifications for metal ball valves
Primary Focus Fire resistance and seat leakage Design, materials, and performance
Valve Types Quarter-turn valves with nonmetallic seats Metal ball valves (flanged, threaded, welded)
Testing Requirements Fire exposure testing Pressure testing, shell testing, seat testing
Application Critical services where fire safety is paramount General industrial applications

Applications of API 607 and API 608 Valves

API 607 Valve Applications

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

  • Oil and gas processing facilities

  • Petrochemical plants

  • Refineries

  • Offshore platforms

  • Any location where flammable materials are present

API 608 Valve Applications

API 608 valves find applications in a wide range of industries for general service applications:

  • Chemical processing

  • Power generation

  • Water treatment

  • HVAC systems

  • General industrial piping systems

Choosing Between API 607