ISO 20766-11:2020 PDF

Overview

ISO 20766-11:2020 specifies requirements for the manual shut-off valve used in road vehicle liquefied petroleum gas (LPG) fuel systems. It covers general design principles, required markings and instructions, and specific test procedures to verify mechanical integrity and leak-tight performance. The standard applies to LPG-powered vehicles (mono‑fuel, bi‑fuel and dual‑fuel) defined by ISO 3833 and to devices with service pressures in the range of 110 kPa to 840 kPa (adjustable for other pressures by ratio).

Key topics and requirements

• Scope and applicability
  • For LPG fuel system manual shut-off valves on motor vehicles; excludes fuel containers, stationary engines, container mounting hardware, electronic fuel management and refuelling receptacles.
• Marking and identification
  • Must allow traceability: manufacturer/agent name, model/part number and working pressure (or working pressure/temperature range).
  • Recommended additional markings: flow direction, flow capacity, fuel type, certification symbol, approval number, serial/date code and reference to this document.
• Construction and assembly
  • Components must meet general provisions in ISO 20766‑1 and ISO 20766‑2 and be assembled to ensure safe LPG service.
• Test requirements
  • Hydrostatic strength: test at 2.5 × working pressure per ISO 20766‑2.
  • Leakage: verified at specified temperatures (e.g., cold, ambient, high) and pressure factors as tabulated in the standard (including low-pressure and overpressure checks).
  • Continued operation (durability): valve body filled with n‑hexane, outlet plugged; inlet subjected to 3 000 kPa or WP (whichever is greater) and cycled at a rate not faster than 10 cycles/min. Valve must remain leak‑proof after 10 000 cycles.
  • Additional applicable tests may include excess torque resistance, bending moment, corrosion, vibration, material compatibility, temperature cycling and exposure to automotive fluids as referenced.

Applications and users

• Who uses ISO 20766-11: vehicle OEMs, LPG component manufacturers, safety and compliance engineers, test laboratories, certification bodies and aftermarket installers.
• Practical value: ensures manual shut-off valves reliably isolate LPG flow, resist pressure and environmental stresses, and carry required identification for traceability and type approval. Useful for design validation, type approval testing and supplier quality control.

Related standards

• ISO 20766-1 - General requirements and definitions for LPG fuel system components
• ISO 20766-2 - Performance and general test methods
• ISO 3833 - Road vehicle types, terms and definitions
• ISO 9162 - Specifications for liquefied petroleum gases

Keywords: ISO 20766-11, LPG manual shut-off valve, road vehicles, LPG fuel systems components, hydrostatic strength, leakage testing, continued operation, vehicle safety standard.