ISO 10522-2021 PDF

Full title and description

ISO 10522:2021 — Agricultural irrigation equipment — Direct-acting pressure-regulating valves. This International Standard specifies construction, performance requirements and test methods for direct-acting pressure-regulating valves intended for use in irrigation systems (water ≤ 60 °C, including waters containing commonly used fertilizers and chemicals). It applies to nominal sizes up to and including DN 100 (4 in).

Abstract

This document defines terminology, classification, marking, technical characteristics and detailed mechanical and functional test procedures for direct-acting pressure-regulating valves used in agricultural irrigation. Key elements include regulation curves, regulation uniformity, tightness tests, declared pre-set pressure (using a reference velocity), minimum flow, accuracy classes and durability/strength checks. The edition updates and replaces the earlier 1993 edition.

General information

• Status: Published.
• Publication date: August 2021 (second edition, published 2021‑08).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 65.060.35 — Irrigation and drainage equipment.
• Edition / version: 2 (Second edition, 2021).
• Number of pages: 15 (ISO published document, edition 2).

Scope

Applies to direct-acting pressure-regulating valves intended for irrigation systems with water temperatures not exceeding 60 °C and that may contain fertilizers and chemicals in concentrations commonly used in agriculture. Covers valves in nominal sizes up to and including 100 mm (4 in) and specifies required construction features, marking, performance parameters and test methods to verify regulation behaviour and durability.

Key topics and requirements

• Definitions and classification: single-range, multi-range, adjustable, integral regulators and accuracy classes (A, B).
• Mandatory marking and labelling: manufacturer, nominal size, nominal pressure, flow direction, declared pre-set pressure and accuracy class.
• Technical characteristics: materials in contact with water must be non-toxic and corrosion-resistant; parts interchangeability; minimum flow and initial regulation pressure requirements.
• Mechanical and functional tests: regulation curve, regulation uniformity, tightness (with adjustable stop), regulated pressure at zero flow, pressure loss and response to inlet pressure changes.
• Durability and strength tests: hydrostatic strength for metal/plastic bodies, cycle testing and operational life checks.
• Performance reporting: declared pre-set pressure referenced to a 1 m/s reference velocity, allowable deviations and temperature limits (≤ 60 °C for irrigation use).
• Nominal size limit: applies up to and including DN 100 (4 in).

Typical use and users

Used by manufacturers of irrigation valves and irrigation-system components, quality and test laboratories, specifiers and system designers, agricultural equipment purchasers, certifying bodies and researchers evaluating valve performance and system uniformity. It is referenced when selecting and testing pressure regulators for drip, micro‑sprinkler and sprinkler irrigation systems.

Related standards

Supersedes ISO 10522:1993. Other related irrigation equipment standards and guidelines include ISO 11738 (Control heads for irrigation equipment) and recent irrigation system/sprinkler guidance standards (for example parts of ISO 24120 series). These documents are commonly used together when specifying and testing irrigation control assemblies and components.

Keywords

pressure-regulating valve, pressure regulator, irrigation, agricultural irrigation equipment, direct-acting, regulation curve, regulation uniformity, declared pre-set pressure, reference velocity, DN 100, accuracy class, testing, marking, durability.

FAQ

Q: What is this standard?

A: ISO 10522:2021 is an international standard specifying construction, performance and test methods for direct-acting pressure-regulating valves used in agricultural irrigation systems.

Q: What does it cover?

A: It covers definitions, classification, required markings, technical characteristics, and detailed mechanical and functional tests (regulation curve, uniformity, tightness, durability) for pressure regulators intended for irrigation water up to 60 °C, for nominal sizes up to DN 100 (4 in).

Q: Who typically uses it?

A: Valve manufacturers, test labs, irrigation system designers/specifiers, procurement teams, certifiers and researchers evaluating irrigation pressure control components.

Q: Is it current or superseded?

A: This is the current (second) edition published in August 2021 and it replaces the previous ISO 10522:1993 edition. Users should verify national adoptions or amendments in their country.

Q: Is it part of a series?

A: It is part of the body of ISO standards for agricultural irrigation equipment (ISO/TC 23/SC 18) and is commonly used alongside related standards such as ISO 11738 (control heads) and other irrigation guidance standards.

Q: What are the key keywords?

A: Pressure regulator, direct-acting, irrigation, regulation curve, regulation uniformity, declared pre-set pressure, DN 100, accuracy class A/B, testing, marking.