ISO 20766-13:2022

Overview

ISO 20766-13:2022 defines the general requirements for multivalve components used in liquefied petroleum gas (LPG) fuel systems for road vehicles (as defined in ISO 3833). The standard sets out design principles, marking and instruction requirements and identifies applicable tests to verify safe operation and compliance. It applies to vehicles in mono-fuel, bi-fuel or dual-fuel configurations using gaseous fuels per ISO 9162 and covers devices with service pressures within the specified LPG range.

Key Topics

• Scope and applicability

  • Applicable to LPG multivalves fitted to vehicle fuel containers and systems for road vehicles.
  • Not applicable to fuel containers, stationary gas engines, container mounting hardware, electronic fuel management or refuelling receptacles.

• Marking and traceability

  • Components must be marked to allow traceability of the manufacturer or agent, model/part number, working pressure (or working pressure and temperature range), type approval number and flow direction when required.
  • Recommended additional markings include fuel type, electrical ratings (if applicable), certification symbols, serial number/date code and a reference to ISO 20766-13.

• Construction and assembly

  • The multivalve shall comply with the provisions of ISO 20766-1 and ISO 20766-2.
  • A multivalve may integrate multiple accessory functions in one housing, such as an 80 % stop valve, level indicator, pressure relief valve (PRV), remotely controlled service valve with excess-flow device, pressure relief device (PRD) and non-return valve, among others.

• Service pressure range

  • The document applies to devices with a service pressure in the range of 110 kPa (butane rich at 20 °C) to 840 kPa (propane at 20 °C). Other service pressures can be accommodated by adjusting pressures using the appropriate factor (ratio).

Applications

ISO 20766-13:2022 is intended for designers, manufacturers, test houses and regulatory bodies involved with LPG fuel systems for road vehicles. Typical applications and benefits include:

• Ensuring safe operation of integrated multivalve devices in LPG systems.
• Providing requirements for marking and instructions to support installation, inspection and traceability.
• Defining test requirements to confirm strength and leakage performance under representative temperatures and pressures.

Notably, hydrostatic strength testing is performed at 2,25 times the working pressure, and leakage and functional tests are carried out at specified temperatures and pressure factors as described in the standard.

Related Standards

• ISO 20766-1 - General requirements and definitions
• ISO 20766-2 - Performance and general test methods
• ISO 20766 series parts (e.g., Parts 3, 4, 6, 7, 9, 11) covering specific components such as 80 % stop valves, level indicators, PRVs, remotely controlled shut-off valves, PRDs and manual shut-off valves
• ISO 3833 - Vehicle types and definitions
• ISO 9162 - LPG fuel specifications

For implementation or certification, consult the full ISO 20766-13:2022 text and coordinate with your national standards body or certification agency to ensure conformity and appropriate testing.