ISA-75 Series: Guiding Excellence in Control Valve Design, Testing and Performance
The ISA-75 series offers a comprehensive collection of standards, technical reports and recommended practices that guide control valve design, testing and performance evaluation. These resources are essential for promoting valve reliability, safety and performance across a wide range of industrial applications, including oil and gas, power generation and chemical processing.
By adopting the ISA-75 standards, organizations can standardize their control valve operations, improve integration and enhance the overall performance and longevity of their systems.
The ISA-75 series covers a wide range of topics, providing clear guidance on valve terminology, dimensional standards, testing procedures, performance criteria and diagnostics.
ISA-75 Standards and Technical Reports
Terminology and Definitions
ANSI/ISA-75.25.01-2024, Test Procedure for Control Valve Response Measurement from Step Inputs
This standard defines standardized face-to-face dimensions for integral flanged globe-style control valve bodies in pressure classes 125, 150, 250, 300 and 600, covering valve sizes from 15 mm (1/2 inch) to 400 mm (16 inches). These standardized dimensions promote compatibility and interchangeability across different manufacturers, simplifying valve installation, maintenance and replacement in piping systems without the need for custom modifications. This standard supports consistent engineering practices and aligns with global expectations for control valve design.
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Face-to-Face and Dimensional Standards
These standards define the precise dimensions of various types of control valves, promoting compatibility and consistency across different manufacturers and valve types.
ANSI/ISA-75.08.01-2016, Face-to-Face Dimensions for Integral Flanged Globe-Style Control Valve Bodies (Classes 125, 150, 250, 300 and 600)
This standard defines the face-to-face dimensions for integral flanged globe-style control valve bodies used in pressure classes 125, 150, 250, 300 and 600, covering valve sizes from 15 mm (1/2 inch) to 400 mm (16 inches). By providing consistent dimensional guides, this standard promotes compatibility across different manufacturers, making it easier to install, replace or maintain valves within a piping system. This uniformity helps maintain proper alignment and fit without the need for custom adjustments or modifications in the field. As a result, this standard supports improved system performance, operational efficiency and cost-effectiveness in industries where accurate flow control is critical.
ANSI/ISA-75.08.02-2003, (R2017), Face-to-Face Dimensions for Flanged and Flangeless Rotary Control Valves (Classes 150, 300, 600 and PN 10, PN 16, PN 25, PN 40, PN 63 and PN 100)
This standard specifies the face-to-face dimensions for both flanged and flangeless rotary control valves in pressure classes 150, 300 and 600, as well as PN ratings from PN 10 to PN 100, covering valve sizes from 20 mm (3/4 inch) to 600 mm (24 inches). This standard plays a key role in promoting dimensional uniformity across various types and brands of rotary control valves, which are commonly used in flow regulation applications. Establishing consistent dimensions simplifies valve selection, installation and replacement within piping systems while also supporting efficient system layout and reducing the need for custom pipe fittings or modifications. This contributes to improved interoperability, operational reliability and reduced maintenance complexity in industrial environments where rotary valve performance is essential.
Add PDF to CartANSI/ISA-75.08.04-2001 (R2013), Face-to-Face Dimensions for Buttweld-End Globe-Style Control Valves (Class 4500)
This standard outlines the face-to-face dimensions for buttweld-end globe-style control valves designed for high-pressure Class 4500 applications, covering valve sizes from 15 mm (1/2 inch) to 200 mm (8 inches). It provides a uniform dimensional reference for valve manufacturers and system designers working with extremely high-pressure systems, where precision and compatibility are critical. By defining these standardized dimensions, this standard supports consistent installation practices, simplifies the replacement process and reduces the need for custom piping arrangements. This is especially important in high-stress industrial environments, such as power generation or chemical processing, where reliability, safety and efficiency are vital. The standard supports streamlined system integration and contributes to long-term operational stability in demanding service conditions.
Add PDF to CartANSI/ISA-75.08.05-2016, Face-to-Face Dimensions for Buttweld-End Globe-Style Control Valves (Classes 150, 300, 600, 900, 1500 and 2500)
This standard establishes the face-to-face dimensions for buttweld-end globe-style control valves across a broad range of pressure classes, from Class 150 to Class 2500, and valve sizes ranging from 15 mm (1/2 inch) to 450 mm (18 inches). It plays a vital role in maintaining dimensional consistency for high- and low-pressure applications, helping to streamline the design, fabrication and installation of control valves in complex piping systems. By standardizing these dimensions, the document supports compatibility among valves from different manufacturers and simplifies maintenance and replacement procedures. It also helps reduce the need for field modifications or custom fittings, ultimately contributing to improved efficiency, reduced downtime and enhanced performance in a variety of industrial processes where precise flow control is essential.
Add PDF to CartANSI/ISA-75.08.06-2002 (R2013), Face-to-Face Dimensions for Flanged Globe-Style Control Valve Bodies (Classes 900, 1500 and 2500)
This standard specifies the face-to-face dimensions for flanged globe-style control valve bodies designed for high-pressure applications in Classes 900, 1500 and 2500. These pressure classes are typically used in demanding industrial environments, such as oil and gas, petrochemical and power generation, where equipment must withstand extreme pressures and maintain reliable performance. By defining uniform face-to-face dimensions, the standard helps achieve consistent valve integration within piping systems, regardless of the manufacturer. This dimensional consistency simplifies engineering design, facilitates valve interchangeability and minimizes the need for custom piping work during installation or replacement. As a result, this standard contributes to improved system efficiency, operational safety and reduced maintenance complexity in high-pressure process applications.
Add PDF to CartANSI/ISA-75.08.07-2001 (R2013), Face-to-Face Dimensions for Separable Flanged Globe-Style Control Valves (Classes 150, 300 and 600)
This standard defines the face-to-face dimensions for separable flanged globe-style control valves used in pressure classes 150, 300 and 600. Separable flanged valves consist of valve bodies and flanges that are manufactured as individual components and assembled, offering flexibility in design and easier maintenance. By standardizing the face-to-face dimensions for this valve type, the standard promotes compatibility across different manufacturers and system configurations, streamlining the design, installation and replacement processes. This consistency helps reduce the need for custom fabrication and supports efficient system integration in various industrial applications. This standard plays a key role in ensuring reliable valve performance, operational continuity and simplified maintenance in systems requiring precise flow control under moderate pressure conditions.
Add PDF to CartANSI/ISA-75.08.08-2015, Face-to-Centerline Dimensions for Flanged Globe-Style Angle Control Valve Bodies (Classes 150, 300 and 600)
This standard provides face-to-centerline dimensions for raised-face flanged globe-style angle control valve bodies in pressure classes 150, 300 and 600. This valve design features an angular configuration, typically with the outlet positioned at a 90-degree angle to the inlet, which is commonly used in applications requiring changes in flow direction or compact piping layouts. By standardizing the face-to-centerline dimensions, thisstandard promotes uniformity across valve designs, enabling easier integration into piping systems and enhancing interchangeability among manufacturers. It also simplifies engineering design, installation and maintenance tasks, reducing the need for customized fittings or field adjustments. This contributes to improved system efficiency, reduced installation time and greater reliability in various industrial processes where angle valves are preferred for space-saving or directional flow control solutions.
Add PDF to CartANSI/ISA-75.08.09-2016, Face-to-Face Dimensions for Sliding Stem Flangeless Control Valves (Classes 150, 300 and 600)
This standard defines the face-to-face dimensions for sliding stem flangeless control valves used in pressure classes 150, 300 and 600, covering valve sizes from 20 mm (3/4 inch) to 600 mm (24 inches). Sliding stem flangeless valves are designed for compact installation within piping systems, offering a space-saving alternative to traditional flanged designs. By establishing consistent face-to-face dimensions, this standard supports compatibility across manufacturers, streamlines valve installation and simplifies system design and maintenance. The flangeless configuration also enables direct mounting between pipe flanges, reducing the need for extra fittings or extensive pipe modifications. As a result, this standard contributes to improved flexibility, reduced installation costs and enhanced operational efficiency in a variety of industrial applications requiring reliable and precise flow control.
Add PDF to CartANSI/ISA-75.10.02-2014 (R2024), Installed Face-to-Face Dimensions for Dual Pinch Flanged Clamp or Pinch Valves (Classes 125 and 150)
This standard establishes the installed face-to-face dimensions for dual pinch flanged clamp or pinch valves used in pressure classes 125 and 150. By standardizing these critical dimensions, the document promotes interchangeability among manufacturers, simplifies piping system design and facilitates easier installation and maintenance. Consistent face-to-face dimensions help reduce the need for custom fittings or field modifications, supporting more efficient system integration and enhancing operational reliability across a range of industrial applications where pinch valve designs are used for flow control in challenging service conditions.
Add PDF to CartANSI/ISA-75.10.03-2015 (R2024), Installed Face-to-Face Dimensions for Shell and Tube Flanged Pinch Valves (Classes 125 and 150)
This standard specifies the installed face-to-face dimensions for shell and tube flanged pinch valves in pressure classes 125 and 150. By defining uniform dimensions, the standard supports interchangeability among manufacturers, simplifies piping design and streamlines installation and maintenance processes. Standardizing these dimensions helps reduce the need for custom fabrication or adjustments in the field, improving system efficiency and reliability in industrial applications where shell and tube pinch valves are used to handle abrasive, corrosive or difficult-to-control fluids.
Add PDF to CartPerformance and Testing Standards
This set of standards ensures that control valves perform optimally and safely under various conditions.
ANSI/ISA-75.10.01-2024, General Requirements for Clamp or Pinch Valves (Classes 125 and 150)
This standard defines the general requirements for clamp or pinch valves used in control applications for Classes 125 and 150 pressure ratings. It covers key design criteria, including materials, construction, dimensions, pressure-temperature ratings and functional performance to promote consistency across manufacturers. By standardizing these requirements, the document helps ensure compatibility, safety and reliable operation of clamp or pinch valves in industrial fluid handling systems. The standard supports easier specification, procurement and maintenance while reducing the need for customized solutions and simplifying integration into piping systems.
Add PDF to CartANSI/ISA-75.11.01-2013, Inherent Flow Characteristic and Rangeability of Control Valves
This standard establishes standardized definitions and guidance for evaluating the inherent flow characteristics and rangeability of control valves used in process control systems. It provides a clear methodology for determining how a valve responds to varying degrees of valve opening under constant pressure drop conditions, helping to classify valves based on their inherent flow behavior, such as linear, equal percentage or quick opening. Additionally, it defines rangeability as the ratio of the maximum controllable flow to the minimum controllable flow, offering a consistent framework for comparing different valve designs and their performance capabilities. By standardizing these parameters, the document aids manufacturers, designers and users in selecting and applying control valves more effectively, leading to reliable and predictable system behavior across a range of operating conditions.
Add PDF to CartANSI/ISA-75.13.01-2013, Method of Evaluating the Performance of Positioners with Analog Input Signals and Pneumatic Output
This standard outlines standardized procedures for testing and assessing the performance of valve positioners that receive analog input signals and deliver pneumatic output to control valves. It specifies detailed test methods for evaluating key performance characteristics such as sensitivity, hysteresis, linearity, deadband and response time. Providing consistent and repeatable testing criteria allows manufacturers and end users to accurately compare different positioners and verify their conformance to specified performance levels. The standard is essential for optimizing control loop performance, as positioners play a critical role in translating control signals into precise valve movements. Ultimately, it supports better product selection, quality assurance and system integration in process automation environments.
Add PDF to CartANSI/ISA-75.19.01-2024, Hydrostatic Testing of Control Valves
This standard establishes the requirements and procedures for conducting hydrostatic pressure tests on control valves constructed from a wide range of materials. It is designed to verify the structural integrity and pressure containment capability of valve bodies, bonnets and related pressure-retaining components under specified test conditions. It outlines acceptable pressure levels, duration of testing and criteria for leakage or failure, helping confirm that control valves meet necessary safety and durability standards before being placed into service. By applying these standardized hydrostatic testing protocols, manufacturers and users can validate the reliability and performance of control valves in demanding process environments while maintaining consistency in quality and compliance across different valve types and materials.
Add PDF to CartANSI/ISA-75.25.01-2024, Test Procedure for Control Valve Response Measurement from Step Inputs
This standard provides a standardized methodology for evaluating the dynamic response of control valves to step changes in input signals. It defines test setups, measurement techniques and performance criteria for assessing key response characteristics such as dead time, rise time, settling time and overshoot. These parameters are critical for understanding how quickly and accurately a control valve reacts to changes in control signals, which directly impacts the stability and efficiency of process control systems. By offering a consistent testing framework, this standard enables manufacturers, system integrators and end users to compare valve performance, diagnose control loop issues and select appropriate valve-actuator combinations for specific process requirements. The procedures outlined help improve the predictability and responsiveness of automated control systems across a wide range of industrial applications.
Add PDF to CartANSI/ISA-75.27.01-2024, Cryogenic and Low-Temperature Seat Leakage Testing of Control Valves
This standard defines standardized procedures for evaluating the seat leakage performance of control valves operating in cryogenic and low-temperature environments. The standard is critical for applications involving liquefied gases and other extremely cold fluids, where leakage through valve seats can lead to safety hazards, product loss or compromised process efficiency. It specifies the test conditions, equipment setup, allowable leakage limits and acceptable test media to accurately assess how well a valve seat maintains a tight seal under low-temperature conditions. By providing a uniform testing framework, the standard allows manufacturers and users to validate valve performance, compare products and verify suitability for demanding cryogenic service. It plays an essential role in quality assurance and system reliability for industries such as LNG, aerospace, pharmaceuticals and industrial gas processing.
Add PDF to CartISA-75.07-1997, Laboratory Measurement of Aerodynamic Noise Generated by Control Valves
This standard provides standardized procedures for measuring the noise produced when compressible fluids such as air, steam or gas flow through control valves under laboratory conditions. It focuses on aerodynamic noise, which results from turbulent flow and pressure fluctuations as the fluid passes through the valve. It outlines test setups, measurement techniques and data reporting requirements to capture sound pressure levels and frequency characteristics accurately. By establishing consistent methods for evaluating noise performance, the standard enables manufacturers and end users to assess and compare valve designs, support noise mitigation strategies and comply with occupational health and environmental regulations. This is particularly important in industries where excessive noise can affect worker safety, equipment lifespan and overall plant performance.
Add PDF to CartDiagnostic Data and Reporting
ANSI/ISA-75.26.01-2006, Control Valve Diagnostic Data Acquisition and Reporting
This standard provides a standardized framework for collecting, analyzing and reporting diagnostic data from control valves. It outlines consistent methods for acquiring key performance indicators such as valve travel, actuator pressure, response time and deviations from setpoints, whether during normal operation or through dedicated diagnostic testing. It also defines formats and guidance for reporting this information in a clear and actionable manner, facilitating better communication between control system operators, maintenance personnel and engineers. By enabling a structured approach to valve diagnostics, this standard supports proactive maintenance strategies, reduces unplanned downtime and enhances overall system reliability and efficiency. It is particularly valuable in modern process industries where smart instrumentation and digital valve controllers are widely used to monitor asset health and optimize plant performance.
Add PDF to CartTechnical Reports and Recommended Practices
These documents provide valuable insights into complex valve-related challenges.
ISA-TR75.04.01-1998 (R2006), Control Valve Position Stability
This technical report explores the concept of valve stem position stability and the factors that influence it in dynamic process control environments. The report provides guidance on how to evaluate and quantify position stability, including definitions, measurement techniques and performance benchmarks. It addresses various sources of instability such as mechanical hysteresis, actuator responsiveness, valve friction and process disturbances, all of which can affect the valve's ability to maintain a consistent position in response to control signals. By offering insights into how to measure and improve position stability, the report helps engineers and maintenance professionals identify performance issues, optimize valve selection and enhance control loop accuracy. This is particularly important in applications requiring precise flow control, where even minor deviations in valve position can lead to process inefficiencies or product quality issues.
Add PDF to CartISA-TR75.25.02-2024, Control Valve Response Measurement from Step Inputs
This technical report offers detailed guidance on evaluating how control valves respond to step changes in input signals, a critical aspect of assessing valve dynamics in process control systems. The report complements existing standards by elaborating on best practices, test configurations and data interpretation methods for measuring key response characteristics such as dead time, rise time, overshoot and settling time. It also discusses the influence of actuator type, valve design and system conditions on response behavior, helping users better understand how different components contribute to overall valve performance. This information is valuable for engineers and technicians involved in valve selection, tuning, diagnostics and troubleshooting, as it supports more accurate characterization of control loop behavior and promotes performance optimization in real-world operating environments.
Add PDF to CartISA-RP75.23-1995, Considerations for Evaluating Control Valve Cavitation
This recommended practice provides guidance on identifying, evaluating and mitigating cavitation in control valves, a damaging phenomenon that occurs when vapor bubbles form and collapse within a fluid flow due to rapid pressure changes. The document outlines the physical mechanisms behind cavitation, describes how it can affect valve performance and longevity and presents methods for predicting its occurrence based on flow conditions and valve characteristics. It also offers practical recommendations for selecting and applying control valves in ways that minimize cavitation risk, such as using specific trim designs, staging pressure drops or choosing more resilient materials. By applying the principles outlined in this practice, engineers can make informed decisions to protect valves from cavitation-related wear, noise and failure, ultimately promoting more efficient, reliable and long-lasting control valve operation in challenging service conditions.
Add PDF to CartWhy Are the ISA-75 Series of Standards Important?
The ISA-75 standards provide a wealth of information that helps optimize the design, integration and operation of control valves across industries.
Consistency and Compatibility
By standardizing dimensions, performance characteristics and testing methods, the ISA-75 series allows control valves from different manufacturers to be easily integrated and replaced. This interoperability is vital for system compatibility and seamless upgrades across diverse applications.
Safety and Reliability
Control valves play a vital role in maintaining system safety. The ISA-75 standards include rigorous testing procedures that validate a valve’s ability to function safely under extreme conditions such as high pressure, high temperatures and corrosive environments. These measures support reliable operation and help minimize risks to equipment and personnel.
Performance Optimization
Valves must function precisely to optimize process control and reduce inefficiencies. Standards like ANSI/ISA-75.11.01-2013 help technicians and installers verify that valves exhibit the correct flow characteristics and rangeability, enabling precise control and enhanced process performance, especially in critical applications.
Quality Assurance
Testing standards such as ANSI/ISA-75.19.01-2024 (hydrostatic testing) and ANSI/ISA-75.27.01-2024 (cryogenic seat leakage testing) provide the necessary guidance to validate the durability and integrity of control valves. These tests help reduce the risk of failures and ensure that the valves perform at their best throughout their lifecycle.
Noise and Cavitation Management
Excessive noise and cavitation can compromise valve performance and cause significant wear over time. The ISA-75 series includes standards and recommended practices like ISA-75.07-1997 and ISA-RP75.23-1995 (R2024), which guide engineers in designing systems that minimize harmful noise levels and prevent cavitation, enhancing system longevity and operational efficiency.
Diagnostic and Maintenance Efficiency
With standards like ANSI/ISA-75.26.01-2006, operators can implement diagnostic data acquisition systems that provide real-time insights into valve performance. These diagnostic tools allow for predictive maintenance, helping to identify and address potential issues before they result in system downtime or failure.
International Recognition
The ISA-75 standards are globally recognized and widely accepted across industries, supporting compliance with regulatory requirements and fostering best practices. They promote consistency and uphold high standards across key sectors such as oil and gas, power generation and chemical processing.
Optimizing Your Control Valve Operations with ISA-75 Standards
Utilizing the ISA-75 series of standards, technical reports and recommended practices is essential for promoting safe, reliable and efficient operation of control valves. Whether you're involved in design, integration or maintenance, these standards offer a framework to optimize valve performance, support regulatory compliance and extend the longevity of your systems.
Meet the Experts Behind the Standards: ISA75 Committee
The ISA75 committee plays a vital role in shaping the future of control valve technology across diverse industrial applications. Through the development of standards, technical reports and recommended practices, the committee addresses key areas such as performance, sizing, selection and application to promote safe, efficient and reliable valve operation. View current ISA75 committee members.
Ready to Make an Impact? Join a global network of industry professionals driving innovation and best practices in control valve systems. Apply Now to Join the ISA75 Committee!
For additional information, please contact the ISA standards team at standards@isa.org.