Conversion Kit Purpose Upgrade in-service vacuum valve from apparatus group IIA to apparatus group IIB To prevent the passage of flames into the cargo tank of flammable vapour and gas belonging to apparatus group IIB Only suitable forĀ Pres-Vac vacuum valveĀ type HS-ISO-VAC Installation Consists of duplex IIB wire mesh element flame screen Replacement of existing flame screen with a new flame screen approved for apparatus group IIB Check-lift the movable parts by pushing the check-lift knob Attending crew must be familiar with the normal friction in the system to evaluate if the parts move without friction Download the full instruction manual for Conversion Kit for Vacuum Valve type HS-ISO-VAC hereĀ