Tanks for transport of dangerous goods - Service equipment for tanks - Non pressure balanced footvalve

This document establishes essential technical requirements and test procedures for pressure equalization valves installed at the bottom of tank vehicles dedicated to the transport of hazardous goods. The equipment described is critical for maintaining internal pressure equilibrium between tank compartments during various operational phases, including filling, emptying, and transit, thereby preventing potential over-pressurization or vacuum conditions that could compromise structural integrity. The scope covers design specifications, material compatibility with hazardous substances, leak tightness criteria, and functional performance under dynamic loading scenarios typical in road transport environments. Compliance ensures that valves operate reliably within specified temperature and pressure ranges while meeting strict safety margins. The document outlines methods for verifying that the valve mechanisms respond correctly to pressure differentials and automatically restore balance when required. It addresses dimensions, connection interfaces, and marking requirements to ensure interchangeability and proper installation on compatible tank vehicles. This standard focuses exclusively on the engineering and safety attributes of the bottom-mounted valve assembly, providing a framework for manufacturers and regulators to assess product suitability for the carriage of dangerous materials without reference to broader logistical or administrative regulations.