ISO 21358:2020

Overview

ISO 21358:2020 is an international standard published by the International Organization for Standardization (ISO) focusing on vacuum technology. Specifically, it defines the dimensions and interfaces for right-angle valves equipped with pneumatic actuators. This standard ensures that right-angle valves are compatible with the mounting dimensions of pipeline elbows as established in ISO 9803-1 and ISO 9803-2. It also covers right-angle valves with flanges defined in ISO 2861, ISO 1609, and ISO 3669, promoting interoperability and consistency in vacuum system components.

By standardizing the dimensions, this ISO document streamlines the design, manufacturing, and integration of right-angle valves within vacuum systems, essential for maintaining reliable and efficient pneumatic control.

Key Topics

• Right-angle valve dimensions: The standard defines precise mounting dimensions to ensure compatibility with elbows specified in ISO 9803 series.
• Flange compatibility: Covers valves with non-knife edge flanges (ISO 2861, ISO 1609) and knife-edge flanges (ISO 3669), addressing a broad range of vacuum applications.
• Pneumatic actuator interfaces: Specifies minimum and maximum pneumatic pressures (0.4 MPa minimum to 0.7 MPa maximum) required for valve operation and outlines thread sizes for actuator inlet/outlet ports, enhancing ease of installation and maintenance.
• Electrical interface details: Includes requirements for electrical specifications of contact points used for valve status indication, supporting integration with control systems.
• Tolerances and perpendicularity: Provides dimensional tolerances for valve flanges and face perpendicularity to assure accurate fitting and sealing in vacuum pipelines.

Applications

ISO 21358:2020 is essential for industries and sectors utilizing vacuum technology where right-angle valves play a critical role, including but not limited to:

• Vacuum system manufacturing: Enables consistent production of right-angle valves that fit standardized pipeline fittings.
• Pneumatic control systems: Supports precise valve actuation in automated vacuum environments.
• Scientific research and laboratories: Ensures reliable vacuum pipeline assembly in experimental setups.
• Semiconductor and electronics fabrication: Facilitates high-purity vacuum system configurations with standardized components.
• Industrial vacuum processes: Enhances maintenance and replacement efficiency through standardized valve interfaces.

By adhering to ISO 21358:2020, manufacturers and system integrators benefit from reduced compatibility issues, streamlined assembly processes, and improved operational reliability of vacuum system valves.

Related Standards

To fully apply ISO 21358:2020, the following standards form a critical framework:

• ISO 9803-1 & ISO 9803-2: Define mounting dimensions of pipeline fittings for non-knife edge and knife-edge flange types respectively, providing the foundation for valve compatibility.
• ISO 2861: Specifies dimensions for clamped-type quick-release couplings commonly used in vacuum systems.
• ISO 1609: Covers dimensions of non-knife edge flanges.
• ISO 3669: Addresses dimensions of knife-edge flanges.
• ISO 3: Provides series of preferred numbers relevant to standardization processes.

These complementary standards collectively ensure comprehensive compatibility and interchangeability of vacuum system fittings and valves globally.

Keywords: ISO 21358:2020, vacuum technology, right-angle valve, pneumatic actuator, vacuum flange dimensions, vacuum pipeline fittings, ISO 9803, ISO 2861, ISO 1609, ISO 3669, valve mounting dimensions, pneumatic valve interface, vacuum system standard, right-angle valve standard, pneumatic control valve.