ISO 13693-2:2015 PDF

Overview

ISO 13693-2:2015 specifies construction, performance requirements and test methods for metal-bodied chemigation valve assemblies used in agricultural irrigation (sizes DN 75 / 3" to DN 350 / 14"). It covers valves intended to work with irrigation water (≤ 50 °C) that may contain fertilizers or common agricultural chemicals, and is focused on preventing backflow (both back pressure and back siphonage) that could contaminate irrigation wells or other pressurized water supplies. The standard explicitly excludes use in potable water systems.

Key Topics and Technical Requirements

• Valve assembly components: valve body with spring-loaded check and resilient disk cover, upstream combination air release/vacuum relief valve, upstream low-pressure drain valve, and an inspection port for manual/visual inspection.
• Design requirements:
  • Full flow in open position; watertight seal on reverse flow.
  • Air vent/vacuum relief must act on pump start-up and shut-down.
  • Low-pressure drain opens at atmospheric pressure and remains open until ≥ 15 kPa is present.
  • Inspection port must provide at least 115 mm clearance and be hand-removable for pressure tests.
  • Injection port downstream of the check valve to promote mixing and minimize chemical contact with the valve body.
  • Removable components for inspection/replacement; chemical-resistant materials.
  • Maximum average velocity through the valve limited to 3.0 m/s (stated maximum flow rate).
  • Low-pressure drain nominal internal diameter ≥ 15 mm.
• Performance and testing:
  • Mechanical strength and resistance to internal pressure (e.g., specified pressure tests such as 1 MPa for 5 min in preparation steps).
  • Tests for hydraulic characteristics, vacuum relief behavior, elevated temperature, endurance, and acoustic properties.
  • Permissible measurement deviations: flow/pressure ±2 %, temperature 23 °C ±5 °C, time ±1 %.
• Conformity assessment: type tests, production control, marking, technical documentation and packaging requirements.

Applications

• Mainline chemigation check valve assemblies for pressurized agricultural irrigation systems.
• Preventing backflow of injected chemicals into wells and protecting groundwater.
• Used wherever chemicals (fertilizers, pesticides) are injected into irrigation lines and reliable backflow prevention and inspection capability are required.

Who Uses This Standard

• Irrigation equipment manufacturers and valve designers
• Agricultural system integrators and farm irrigation engineers
• Test laboratories and conformity assessment bodies
• Agricultural safety officers, procurement teams, and regulatory authorities

Related Standards

• ISO 9635-1:2014 - Agricultural irrigation equipment - Irrigation valves - Part 1: General requirements (normative reference)
• EN 1267:1999 - Industrial valves - Test of flow resistance using water as a test fluid (normative reference)

Keywords: ISO 13693-2:2015, chemigation valve, chemigation valve assembly, irrigation safety, backflow prevention, metal-bodied chemigation valves, agricultural irrigation standards.