Overview
ISO 7714:2018 - "Agricultural irrigation equipment - Volumetric valves - General requirements and test methods" is the international standard that defines the general requirements, classification and test methods for volumetric valves used in agricultural irrigation. The document covers valves that automatically deliver preset quantities of water and are actuated solely by pipeline pressure and flow (no external energy source). It is the fifth edition (2018) and supersedes ISO 7714:2008. The standard notes typical operating conditions, for example performance across a variety of irrigation water qualities and temperatures between 5 °C and 50 °C.
Key topics and technical requirements
- Definitions and classification: Clear terms for volumetric, serial (single‑outlet, skip‑over, dual‑outlet) and non‑serial volumetric valves.
- Accuracy classes:
- Class 1 - cumulative volume counter accuracy ±2%
- Class 2 - cumulative volume counter accuracy ±4%
- Class 3 - preset volume mechanism without cumulative counter
- Flow and pressure parameters: Definitions and requirements for minimum flow (qV1), permanent flow (qV3) and overload flow (qV4), and range of working pressures (minimum and maximum working pressure).
- Markings: Mandatory permanent markings (manufacturer, serial number, flow direction, nominal pressure, accuracy class, qV3 and qV3/qV1 ratio, serial connection points).
- Metrological requirements: Valves used for water measurement must comply with metrological characteristics such as those in ISO 16399:2014.
- Mechanical, functional and accuracy tests: Pattern approval, thermal preconditioning, hydrostatic pressure resistance, manual opening/closing, accuracy across flow rates, pressure loss tests and endurance tests.
- Materials and durability: Interchangeability of parts, resistance to agricultural chemicals, UV protection for non‑metallic parts and suitability for expected water qualities (Annex A: water quality / granulometry).
Practical applications and users
ISO 7714:2018 is essential for:
- Manufacturers of irrigation volumetric valves (design, testing, marking and documentation).
- Test laboratories and certification bodies conducting pattern approval and endurance testing.
- Irrigation system designers and consultants specifying valves for drip, sprinkler and other irrigation installations.
- Procurement and quality managers in agriculture and landscaping specifying compliance and acceptance criteria.
- Regulators and metrology authorities when volumetric valves are used for measured water delivery.
Related standards
- ISO 16399:2014 - Meters for irrigation water (metrological characteristics)
- ISO 9644 - Pressure losses in irrigation valves - Test method
- ISO 7‑1 - Pipe threads where pressure‑tight joints are made on the threads
Keywords: ISO 7714:2018, volumetric valves, agricultural irrigation equipment, test methods, metrological requirements, accuracy classes, flow rates, endurance tests.
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